New upstream version 3.0.5upstream/3.0.5

author: Jörg Frings-Fürst <debian@jff-webhosting.net> 2019-07-14 08:35:24 +0200
committer: Jörg Frings-Fürst <debian@jff-webhosting.net> 2019-07-14 08:35:24 +0200
commit: 697e33ed224b539a42ff68121f7497f5bbf941b2 (patch)
tree: 44ae83ad6ad4a7f6762a6d1bfde3766a1993b5ec /src
parent: baee03c569c91b745a1e025660b19a718db16e7d (diff)
370 files changed, 6696 insertions, 3534 deletions
diff --git a/src/Announce.txt b/src/Announce.txt
index ebda22e..324b9fc 100644..100755
--- a/src/Announce.txt
+++ b/src/Announce.txt
@@ -18,24 +18,73 @@ So that everyone using SCons can help each other learn how to use it more
 effectively, please go to http://scons.org/lists.html#users to sign up for
 the scons-users mailing list.
 
-RELEASE 3.0.0 - Mon, 18 Sep 2017 08:32:04 -0700
+RELEASE 3.0.5 - Mon, 26 Mar 2019 15:04:42 -0700
 
   Please consult the RELEASE.txt file for a summary of changes since the last
   release and consult the CHANGES.txt file for complete a list of changes
   since last release.  This announcement highlights only the important
   changes.
+    Please note the following important changes since release 3.0.4:
+      - Change the default for AppendENVPath to delete_existing=0, so path
+        order will not be changed, unless explicitly set (Issue #3276)
+      - Add lex construction variable LEXUNISTD for turning off unix headers on windows
+      - Update lex tool to use win_flex on windows if available
+      - Add the textfile tool to the default tool list
+      - The mingw tool now respects SHCCCOMSTR, SHLINKCOMSTR and LDMODULECOMSTR
+      - Add support for finding vswhere under 32 bit Windows installs
+
+
+    Please note the following important changes since release 3.0.3:
+       - Added TEMPFILESUFFIX to allow user to specify suffix for tempfiles used for long command lines
+       - Initial support for ARM architectures with Microsoft Visual Studio 2017. You must set TARGET_ARCH
+         to arm or arm64 to enable.
+       - Fixed issue detecting installs of Microsoft Visual Studio 2017 as well as Microsoft build tools 2017.
+
     Please note the following important changes since release 2.5.1:
-       *IT IS NOT READY FOR PRODUCTION USE*
 
        This is the initial release supporting both python 3.5+ and 2.7.x and pypy
        There are some important changes:
 
-       - Any print statements must now use python 3 syntax of "print()"
+       - Properly support versioned shared libraries for MacOS.  We've also introduced two
+         new env variables APPLELINK_CURRENT_VERSION and APPLELINK_COMPATIBILITY_VERSION which will specify
+         what is passed to the linkers -current_version and -compatibility_version flags.  If not specified
+         they will be derived from SHLIBVERSION as such:
+            - APPLELINK_CURRENT_VERSION = SHLIBVERSION
+            - APPLELINK_COMPATIBILITY_VERSION = all but the last digit in SHLIBVERSION with .0 appended.
+            Note that the values of the above will be validated. Valid format for either APPLELINK variable is
+            X[.Y[.Z]] where 0 <= X <= 65535, 0 <= Y <= 255, 0 <= Z <= 255.
+       - Fix issue #2980 with credit to Piotr Bartosik (and William Blevins).  This is an issue where using
+         TimeStamp-MD5 Decider and CacheDir can yield incorrect md5's being written into the .sconsign.  
+         The difference between Piotr Bartosik's patch and the current code is that the more complicated 
+         creation of file to csig map is only done when the count of children for the current node doesn't 
+         match the previous count which is loaded from the sconsign.
+       - Add flag must_exist to SConscript() call to fail on missing script.
+         Not failing on missing script is now considered deprecated, and the first instance will print a
+         deprecation message.
+       - Add xz compression format to packaging choices.
+       - Add Textfile/Substfile to default environment. (issue #3147)
+       - Remove long deprecated SCons.Options which have been replaced by *Variable() 
+         many years ago.
+       - Updated logic for mingw and clang on win32 to search default tool install paths if not
+         found in normal SCons PATH.  If the user specifies PATH or tool specific paths they
+         will be used and the default paths below will be ignored.
+            - Default path for clang/clangxx : C:\Program Files\LLVM\bin
+            - Default path for mingw         : C:\MinGW\bin and/or  C:\mingw-w64\*\mingw64\bin
+            - Key program to locate mingw    : mingw32-make (as the gcc with mingw prefix has no fixed name)
+        - Added virtualenv support. A new function Virtualenv() determines whether
+          SCons runs in a virtualenv. The search PATH may also be extended to
+          prefer executables from the current virtualenv over the ones provided by
+          base environment. New option --enable-virtualenv provided to import some
+          virtualenv-related variables to SCons and extend every env['ENV']['PATH']
+          automatically. New option --ignore-virtualenv disables this. Two
+          environment variables, SCONS_ENABLE_VIRTUALENV and
+          SCONS_IGNORE_VIRTUALENV are supported for the same purpose.
+       - Recognize new java 9, 10, 11 (as 9.0 and 10.0, 11.0)
        - All node content should be in bytes. This is the default in python 2.7.x,
          in Python 3 all strings are by default unicode. byte and/or bytearray
          should be used if you construct content for return by a custom node type's
          get_content() method.
-       - This is some (as yet unresolved issue) using Literal()'s in some context with
+       - There are some (as yet unresolved issue) using Literal()'s in some context with
          Python 3
        - pypy should be supported, please report any issues to the user's mailing list.
        - Currently if you switch back and forth between python 2.7.x and 3.5+ you will
@@ -1266,6 +1315,3 @@ improve SCons for your needs.
 -- The SCons Development Team
    Gary Oberbrunner and Bill Deegan, maintainers
    Thanks to all the contributors for all your help!
-
-Copyright (c) 2001 - 2017 The SCons Foundation
-src/Announce.txt rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog
diff --git a/src/CHANGES.txt b/src/CHANGES.txt
index ff28506..c46a804 100644..100755
--- a/src/CHANGES.txt
+++ b/src/CHANGES.txt
@@ -5,6 +5,335 @@
                             Change Log
 
 
+RELEASE 3.0.5 - Mon, 26 Mar 2019 15:04:42 -0700
+
+  From William Deegan:
+
+    - Fix Issue #3283 - Handle using --config=force in combination with Decider('MD5-timestamp').
+      3.0.2 in fix for issue #2980 added that deciders can throw DeciderNeedsNode exception.
+      The Configure logic directly calls the decider when using --config=force but wasn't handling
+      that exception.  This would yield minimally configure tests using TryLink() not running and
+      leaving TypeError Nonetype exception in config.log
+    - Fix Issue #3303 - Handle --config=force overwriting the Environment passed into Configure()'s
+      Decider and not clearing it when the configure context is completed.
+    - Add default paths for yacc tool on windows to include cygwin, mingw, and chocolatey
+    - Fix issue #2799 - Fix mingw tool to respect SHCCCOMSTR, SHLINKCOMSTR and LDMODULECOMSTR
+    - Fix Issue #3329 - Add support for MS SDK V10.0A (which is commonly installed with VS2017)
+    - Fix Issue #3333 - Add support for finding vswhere under 32 bit windows installs.
+
+  From Maciej Kumorek:
+    - Update the MSVC tool to include the nologo flag by default in RCFLAGS
+
+  From Daniel Moody:
+    - Change the default for AppendENVPath to delete_existing=0, so path
+      order will not be changed, unless explicitly set (Issue #3276)
+    - Fixed bug which threw error when running SCons on windows system with no MSVC installed.
+    - Update link tool to convert target to node before accessing node member
+    - Update mingw tool to remove MSVC like nologo CCFLAG
+    - Add default paths for lex tool on windows to include cygwin, mingw, and chocolatey
+    - Add lex construction variable LEXUNISTD for turning off unix headers on windows
+    - Update lex tool to use win_flex on windows if available
+
+  From Mats Wichmann:
+    - Quiet open file ResourceWarnings on Python >= 3.6 caused by
+      not using a context manager around Popen.stdout
+    - Add the textfile tool to the default tool list
+    - Fix syntax on is/is not clauses: should not use with a literal
+    - Properly retrieve exit code when catching SystemExit
+    - scons-time now uses context managers around file opens
+    - Fix regex patterns that were not specified as raw strings
+
+  From Bernhard M. Wiedemann:
+    - Do not store build host+user name if reproducible builds are wanted
+    
+
+RELEASE 3.0.4 - Mon, 20 Jan 2019 22:49:27 +0000
+
+  From Mats Wichmann:
+    - Improve finding of Microsoft compiler: add a 'products' wildcard
+      in case 2017 Build Tools only is installed as it is considered a separate
+      product from the default Visual Studio
+    - Add TEMPFILESUFFIX to allow a customizable filename extension, as
+      described in the patch attached to issue #2431.
+    - scons.py and sconsign.py stopped working if script called as a symlink
+      to location in scons-local location.
+    - Fix issue running scons using a symlink to scons.py in an scons-local dir
+    - Doc updates around Default(), and the various *TARGETS variables.
+
+  From Daniel Moody:
+    - Improved support for VC14.1 and Visual Studio 2017, as well as arm and arm64 targets.
+      Issues #3268 & Issue #3222
+    - Initial support for ARM targets with Visual Studio 2017 - Issue #3182 (You must set TARGET_ARCH for this to work)
+    - Update TempFileMunge class to use PRINT_CMD_LINE_FUNC
+
+  From Tobias Herzog
+    - Enhance cpp scanner regex logic to detect if/elif expressions without whitespaces but
+      parenthesis like "#if(defined FOO)" or "#elif!(BAR)" correctly.
+
+
+RELEASE 3.0.3 - Mon, 07 Jan 2019 20:05:22 -0400
+  NOTE: 3.0.2 release was dropped because there was a packaging bug. Please consider all 3.0.2
+        content.
+
+  From William Deegan:
+    - Fixes to packaging logic.  Ensuring the SCons.Tool.clangCommon module is added
+      to the release packages.
+    - Modify scons.bat script to check for scons python script without .py extension if no file
+      scons.py exists. This enables an all platform wheel to work.
+
+  From Mats Wichmann:
+    - Update doc examples to work with Python 3.5+:  map() now returns an iterable instead of a list.
+
+
+RELEASE 3.0.2 - Mon, 31 Dec 2018 16:00:12 -0700
+
+  From Bernard Blackham:
+    - Fixed handling of side-effects in task master (fixes #3013).
+
+  From William Deegan:
+    - Remove long deprecated SCons.Options code and tests.  This removes BoolOption,EnumOption,
+      ListOption,PackageOption, and PathOption which have been replaced by *Variable() many years ago.
+    - Re-Enable parallel SCons (-j) when running via Pypy
+    - Move SCons test framework files to testing/framework and remove all references to QMtest.
+      QMTest has not been used by SCons for some time now.
+    - Updated logic for mingw and clang on win32 to search default tool install paths if not
+      found in normal SCons PATH.  If the user specifies PATH or tool specific paths they
+      will be used and the default paths below will be ignored.
+      - Default path for clang/clangxx : C:\Program Files\LLVM\bin
+      - Default path for mingw         : C:\MinGW\bin and/or  C:\mingw-w64\*\mingw64\bin
+      - Key program to locate mingw    : mingw32-make (as the gcc with mingw prefix has no fixed name)
+    - Fixed issue causing stack trace when python Action function contains a unicode string when being
+      run with Python 2.7
+    - Add alternate path to QT install for Centos in qt tool: /usr/lib64/qt-3.3/bin
+    - Fix Java tools to search reasonable default paths for Win32, Linux, macOS.  Add required paths
+      for swig and java native interface to JAVAINCLUDES.  You should add these to your CPPPATH if you need
+      to compile with them.  This handles spaces in paths in default Java paths on windows.
+    - Added more java paths to match install for Centos 7 of openjdk
+    - Fix new logic which populates JAVAINCLUDES to handle the case where javac is not found.
+    - Fix GH Issue #2580 - # in FRAMEWORKPATH doesn't get properly expanded. The # is left in the
+      command line.
+    - Fix issue #2980 with credit to Piotr Bartosik (and William Blevins).  This is an issue where using
+      TimeStamp-MD5 Decider and CacheDir can yield incorrect md5's being written into the .sconsign.  
+      The difference between Piotr Bartosik's patch and the current code is that the more complicated 
+      creation of file to csig map is only done when the count of children for the current node doesn't 
+      match the previous count which is loaded from the sconsign.
+    - Fix issue # 3106 MSVC if using MSVC_BATCH and target dir had a space would fail due to quirk in
+      MSVC's handling of escaped targetdirs when batch compiling.
+    - Fix GH Issue #3141 unicode string in a TryAction() with python 2.7 crashes.
+    - Fix GH Issue #3212 - Use of Py3 and CacheDir + Configure's TryCompile (or likely and Python Value Nodes)
+      yielded trying to combine strings and bytes which threw exception.
+    - Fix GH Issue #3225 SCons.Util.Flatten() doesn't handle MappingView's produced by dictionary as return
+      values from dict().{items(), keys(), values()}.
+    - Fix GH Issue #3241 - Properly support versioned shared libraries for MacOS.  We've also introduced two
+      new env variables APPLELINK_CURRENT_VERSION and APPLELINK_COMPATIBILITY_VERSION which will specify
+      what is passed to the linkers -current_version and -compatibility_version flags.  If not specified
+      they will be derived from SHLIBVERSION as such:
+      - APPLELINK_CURRENT_VERSION = SHLIBVERSION
+      - APPLELINK_COMPATIBILITY_VERSION = all but the last digit in SHLIBVERSION with .0 appended.
+      Note that the values of the above will be validated. Valid format for either APPLELINK variable is
+      X[.Y[.Z]] where 0 <= X <= 65535, 0 <= Y <= 255, 0 <= Z <= 255.
+      The new variables have been added to the documents and should show up in user guide and manpage.
+    - Fix GH Issue #3136 no longer wrap io.{BufferedReader,BufferedWriter,BufferedRWPair,BufferedRandom,TextIOWrapper
+      with logic to set HANDLE_FLAG_INHERIT flag on the file handle.  Python 3.4+ automatically sets this according
+      to Python docs: https://docs.python.org/3/library/os.html#fd-inheritance
+
+  From Ray Donnelly:
+    - Fix the PATH created by scons.bat (and other .bat files) to provide a normalized
+      PATH.  Some pythons in the 3.6 series are no longer able to handle paths which
+      have ".." in them and end up crashing.  This is done by cd'ing into the directory
+      we want to add to the path and then using %CD% to give us the normalized directory
+      See bug filed under Python 3.6: https://bugs.python.org/issue32457.
+      Note: On Win32 PATH's which have not been normalized may cause undefined behavior
+      by other executables being run by SCons (or any subprocesses of executables being run by SCons).
+      Resolving this issue should eliminate that possibility going forward.
+
+  From Andrew Featherstone
+    - Removed unused --warn options from the man page and source code.
+
+  From Arda Fu
+    - Fix cpp scanner regex logic to treat ifndef for py3.5+. Previously it was 
+      not properly differentiating between if, ifdef, and ifndef.
+
+  From Philipp Maierhöfer
+    - Added a __hash__ method to the class Scons.Subst.Literal. Required when substituting Literal
+      objects when SCons runs with Python 3.
+    - Added missing FORTRANMODDIRPREFIX to the gfortran tool.
+
+  From Matthew Marinets:
+    - Fixed an issue that caused the Java emitter to incorrectly parse arguments to constructors that
+      implemented a class.
+      
+  From Fredrik Medley:
+    - Fix exception when printing of EnviromentError messages.
+      Specifically, this fixes error reporting of the race condition when
+      initializing the cache which error previously was hidden.
+
+  From Daniel Moody:
+    - Updated Jar builder to handle nodes and directories better
+    - Updated Jar builder to flatten source list which could contain embedded lists
+    - Removed some magic numbers from jar.py on behalf of Mats Wichmann (mats@linux.com)
+    - Set the pickling protocal back to highest which was causing issues
+      with variant dir tests. This will cause issues if reading sconsigns
+      pickled with the previous lower protocal.
+    - Updated swig to setup default paths for windows
+    - Updated gettext tools to setup default paths for windows with Cygwin/MinGW setups
+    - Add common location for default paths for cygwin and mingw in Platform modules
+    - Updated YACC tool to work on windows with Cygwin/MinGW setups
+    - Set the pickling protocal back to highest which was causing issues
+      with variant dir tests. This will cause issues if reading sconsigns
+      pickled with the previous lower protocal.
+    - Updated FS.py to handle removal of splitunc function from python 3.7
+    - Updated the vc.py to ignore MSVS versions where not compiler could be found
+
+  From Gary Oberbrunner:
+    - Fix bug when Installing multiple subdirs outside the source tree
+    - fix to_str to handle None without raising exception
+    - Fix -jN for python 3.7
+
+  From Jonathon Reinhart:
+    - Replace all instances of `int main()` in C code with `int main(void)`.
+      Specifically, this fixes the test cases use by Configure.CheckCC() which
+      would fail when using -Wstrict-prototypes.
+
+  From Zachary Tessler:
+    - Fix calculation of signatures for FunctionActions that contain list (or set,...)
+      comprehensions whose expressions involve constant literals. Those constants had
+      been ignored in signatures, so changing them did not cause targets to be rebuilt.
+
+  From Paweł Tomulik:
+    - In the testing framework, module TestCommon, fixed must_contain(),
+      must_not_contain(), and related methods of TestCommon class to work with
+      substrings located at zero offset.
+    - Added virtualenv support. A new function Virtualenv() determines whether
+      SCons runs in a virtualenv. The search PATH may also be extended to
+      prefer executables from the current virtualenv over the ones provided by
+      base environment. New option --enable-virtualenv provided to import some
+      virtualenv-related variables to SCons and extend every env['ENV']['PATH']
+      automatically. New option --ignore-virtualenv disables this. Two
+      environment variables, SCONS_ENABLE_VIRTUALENV and
+      SCONS_IGNORE_VIRTUALENV are supported for the same purpose.
+
+  From Richard West:
+    - Add SConstruct.py, Sconstruct.py, sconstruct.py to the search path for the root SConstruct file.
+      Allows easier debugging within Visual Studio
+    - Change setup.py to change the install directory (via  pip, or setup.py install) from scons-#.#.#
+      to scons (Yielding <pythondir>/lib/scons/SCons/ instead of <pythondir>/lib/scons/SCons-#.#.#/).
+      This changes SCons to better comply with normal Python installation practices.
+
+  From Mats Wichmann:
+    - Recognize new java 9, 10, 11 (as 9.0 and 10.0, 11.0)
+    - Updated manpage scons.xml to fix a nested list problem
+    - Updated doc terminiology: use prepend instead of append as appropriate
+    - XML validity fixes from SConstruct.py change
+    - Update wiki links to new github location
+    - Update bug links to new github location
+    - Make it easier for SConscript() call to fail on missing script.
+      It was possible to call SCons.Warnings.warningAsException
+      (not documented as a user API) to make all warnings fail. Now
+      SConscript can take an optional must_exist flag which if true fails
+      if the script does not exist.  Not failing on missing script is
+      now considered deprecated, and the first instance will print a
+      deprecation message.  It is now also possible to flip the scons
+      behavior (which still defaults to warn, not fail) by calling
+      SCons.Script.set_missing_sconscript_error, which is also not a
+      documented interface at the moment.
+    - Convert TestCmd.read to use with statement on open (quiets 17 py3 warnings)
+    - Quiet py3 warning in UtilTests.py
+    - Fix tests specifying octal constants for py3
+    - Fix must_contain tests for py3
+    - RPM package generation:
+       - Fix supplying a build architecture
+       - Disable auto debug package generation on certain rpmbuild versions
+       - Adjust some tests to only supply build-id file on certain rpmbuild versions
+       - Tests now use a file fixture for the repeated (trivial) main.c program.
+       - Document and comment cleanup.
+       - Added new Environment Value X_RPM_EXTRADEFS to supply custom settings
+         to the specfile without adding specific logic for each one to scons.
+    - The test for Python.h needed by swig tests is moved to get_python_platform
+      so it does not have to be repeated in every test; picks up one failure
+      which did not make the (previously needed) check. Windows version
+      of get_python_platform needed some rework in case running in virtualenv.
+    - If test opens os.devnull, register with atexit so file opens do not leak.
+    - Fix bugs in Win32 process spawn logic to handle OSError exception correctly.
+    - Use time.perf_counter instead of time.clock if it exists.
+      time.clock deprecated since py3.3, due to remove in 3.8. deprecation
+      warnings from py3.7 were failing a bunch of tests on Windows since they
+      mess up expected stderr.
+    - Prefer Py3's inspect.getfullargspec over deprecated inspect.getargspec.
+      Switched to "new" (standard in Py2.7) usage of receiving a namedtuple -
+      we were unpacking to a four-tuple, two of the items of which were unused;
+      getfullargspec returns a named tuple with seven elements so it is a
+      cleaner drop-in replacement using the namedtuple.
+    - Updated the test-framework.rst documentation.
+    - Remove obsoleted internal implementaiton of OrderedDict.
+    - Test for tar packaging fixups
+    - Stop using deprecated unittest asserts
+    - messages in strip-install-dir test now os-neutral
+    - Add xz compression format to packaging choices.
+    - Syntax cleanups - trailing blanks, use "is" to compare with None, etc.
+      Three uses of variables not defined are changed.
+    - Some script changes in trying to find scons engine
+    - Update (pep8) configure-cache script, add a --show option.
+    - Fix for a couple of "what if tool not found" exceptions in framework.
+    - Add Textfile/Substfile to default environment. (issue #3147)
+    - sconsign: a couple of python3 fixes; be more tolerant of implicit
+      entries which have no signatures; minor PEP8 changes.
+    - Fix a couple of type mistakes (list-> string, filter type -> list)
+    - Fix a couple of type mistakes in packaging tools: list-> string in msi,
+      filter type -> list in ipk
+
+  From Bernhard M. Wiedemann:
+    - Update SCons' internal scons build logic to allow overriding build date 
+      with SOURCE_DATE_EPOCH for SCons itself.
+    - Change the datestamps in SCons' docs and embedded in code use ISO 8601 format and UTC
+
+  From Hao Wu
+    - Typo in customized decider example in user guide
+    - Replace usage of unittest.TestSuite with unittest.main() (fix #3113)
+
+RELEASE 3.0.1 - Mon, 12 Nov 2017 15:31:33 -0700
+
+  From Daniel Moody:
+    - Jar can take multiple targets, and will make a duplicate jar from the sources for each target
+    - Added some warnings in case the Jar builder makes an implicit target
+    - Added Jar method and changed jar build to be more specific. Jar method will take in
+      directories or classes as source. Added more tests to JAR to ensure the jar was
+      packaged with the correct compiled class files.
+    - Added a No result test case to handle bug which seems unrelated to java in the
+      swig-dependencies.py test, more info here: http://scons.tigris.org/issues/show_bug.cgi?id=2907
+    - Added a travis script to test on ubuntu trusty now that the project is on github
+      so that Continuus Integration tests can be run automatically. It tests most case and considers
+      no result a pass as well. Improving this script can install more dependincies allowing for more
+      tests to be run.
+
+  From Daniel Moody:
+    - Updated the Jar Builder tool in Tool/__init__.py so that is doesn't force class files as
+      sources, allowing directories to be passed, which was causing test/Java/JAR.py to fail.
+
+  From William Deegan:
+    - Fix issue where code in utility routine to_String_for_subst() had code whose result was never
+      properly returned.
+      (Found by: James Rinkevich https://pairlist4.pair.net/pipermail/scons-users/2017-October/006358.html )
+    - Fixed Variables.GenerateHelpText() to now use the sort parameter. Due to incorrect 2to3 fixer changes
+      8 years ago it was being used as a boolean parameter.  Now you can specify sort to be a callable, or boolean
+      value. (True = normal sort). Manpage also updated.
+    - Fixed Tool loading logic from exploding sys.path with many site_scons/site_tools prepended on py3.
+    - Added additional output with time to process each SConscript file when using --debug=time.
+
+  From Thomas Berg:
+    - Fixed a regression in scons-3.0.0 where "from __future__ import print_function" was imposed
+      on the scope where SConstruct is executed, breaking existing builds using PY 2.7.
+
+  From William Deegan:
+    - Fix broken subst logic where a string with "$$(abc)" was being treated as "$(abc) and the
+      logic for removing the signature escapes was then failing because there was no closing "$)".
+      This was introduced by a pull request to allow recursive variable evaluations to yield a string
+      such as "$( $( some stuff $) $)".
+
+  From Zachary Tessler:
+    - Fix incorrect warning for repeated identical builder calls that use overrides
+
+
 RELEASE 3.0.0 - Mon, 18 Sep 2017 08:32:04 -0700
 
 NOTE: This is a major release.  You should expect that some targets may rebuild when upgrading.
@@ -77,9 +406,9 @@ will cause rebuilds.
     - Add support for Visual Studio 2017.  This support requires vswhere.exe a helper
       tool installed with newer installs of 2017. SCons expects it to be located at
       "C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe"
-      It can be downloaded separately at     
+      It can be downloaded separately at
       https://github.com/Microsoft/vswhere
- 
+
   From Tom Tanner:
     - Allow nested $( ... $) sections
 
@@ -6135,7 +6464,3 @@ A brief overview of important functionality available in release 0.01:
 
   - Windows installer available.
 
-
-
-Copyright (c) 2001 - 2017 The SCons Foundation
-src/CHANGES.txt rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog
diff --git a/src/LICENSE.txt b/src/LICENSE.txt
index ff04f2e..6b6cd6c 100644
--- a/src/LICENSE.txt
+++ b/src/LICENSE.txt
@@ -1,4 +1,4 @@
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/src/README.txt b/src/README.txt
index ffba407..40d7217 100644
--- a/src/README.txt
+++ b/src/README.txt
@@ -2,7 +2,7 @@
 
                  SCons - a software construction tool
 
-                         Version 3.0.0
+                         Version 3.0.3
 
 
 This is SCons, a tool for building software (and other files).  SCons is
@@ -28,8 +28,7 @@ the latest version by checking the SCons download page at:
 EXECUTION REQUIREMENTS
 ======================
 
-Running SCons requires Python version 2.7.*.  Currently it does not 
-run on the Python 3.x release.  There should be
+Running SCons requires Python version 2.7.* or 3.5.* and above.  There should be
 no other dependencies or requirements to run SCons.  (There is, however,
 an additional requirement to *install* SCons from this particular
 package; see the next section.)
@@ -57,7 +56,7 @@ provided Python-standard setup script as follows:
 
 By default, the above command will do the following:
 
-    --  Install the version-numbered "scons-3.0.0" and "sconsign-3.0.0"
+    --  Install the version-numbered "scons-3.0.3" and "sconsign-3.0.3"
         scripts in the default system script directory (/usr/bin or
         C:\Python*\Scripts, for example).  This can be disabled by
         specifying the "--no-version-script" option on the command
@@ -71,17 +70,17 @@ By default, the above command will do the following:
         making it the default on your system.
 
         On UNIX or Linux systems, you can have the "scons" and "sconsign"
-        scripts be hard links or symbolic links to the "scons-3.0.0" and
-        "sconsign-3.0.0" scripts by specifying the "--hardlink-scons"
+        scripts be hard links or symbolic links to the "scons-3.0.3" and
+        "sconsign-3.0.3" scripts by specifying the "--hardlink-scons"
         or "--symlink-scons" options on the command line.
 
-    --  Install "scons-3.0.0.bat" and "scons.bat" wrapper scripts in the
+    --  Install "scons-3.0.3.bat" and "scons.bat" wrapper scripts in the
         Python prefix directory on Windows (C:\Python*, for example).
         This can be disabled by specifying the "--no-install-bat" option
         on the command line.
 
         On UNIX or Linux systems, the "--install-bat" option may be
-        specified to have "scons-3.0.0.bat" and "scons.bat" files
+        specified to have "scons-3.0.3.bat" and "scons.bat" files
         installed in the default system script directory, which is useful
         if you want to install SCons in a shared file system directory
         that can be used to execute SCons from both UNIX/Linux and
@@ -89,7 +88,7 @@ By default, the above command will do the following:
 
     --  Install the SCons build engine (a Python module) in an
         appropriate version-numbered SCons library directory
-        (/usr/lib/scons-3.0.0 or C:\Python*\scons-3.0.0, for example).
+        (/usr/lib/scons-3.0.3 or C:\Python*\scons-3.0.3, for example).
         See below for more options related to installing the build
         engine library.
 
@@ -146,7 +145,7 @@ of small examples for getting started using SCons.
 
 Additional documentation for SCons is available at:
 
-        http://www.scons.org/doc.html
+        https://scons.org/documentation.html
 
 
 LICENSING
@@ -247,4 +246,4 @@ many contributors, including but not at all limited to:
 
 \... and many others.
 
-Copyright (c) 2001 - 2015 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
diff --git a/src/RELEASE.txt b/src/RELEASE.txt
index 82a0c5a..90cc745 100644..100755
--- a/src/RELEASE.txt
+++ b/src/RELEASE.txt
@@ -1,51 +1,43 @@
-  A new SCons checkpoint release, 3.0.0, is now available
-  on the SCons download page:
+A new SCons release, 3.0.5, is now available on the SCons download page:
 
-          http://www.scons.org/download.php
+        https://scons.org/pages/download.html
 
 
-  Here is a summary of the changes since 2.5.1:
+Here is a summary of the changes since 3.0.4:
 
-  NEW FUNCTIONALITY
+CHANGED/ENHANCED EXISTING FUNCTIONALITY
 
-    - Initial support for Python 3.5+
-    - I
+  - Change the default for AppendENVPath to delete_existing=0, so path
+    order will not be changed, unless explicitly set (Issue #3276)
+  - Add lex construction variable LEXUNISTD for turning off unix headers on windows
+  - Update lex tool to use win_flex on windows if available
+  - Add the textfile tool to the default tool list
 
-  DEPRECATED FUNCTIONALITY
+FIXES
 
-    - List anything that's been deprecated since the last release
+  - Fix Issue #3283 - Handle using --config=force in combination with Decider('MD5-timestamp').
+    3.0.2 in fix for issue #2980 added that deciders can throw DeciderNeedsNode exception.
+    The Configure logic directly calls the decider when using --config=force but wasn't handling
+    that exception.  This would yield minimally configure tests using TryLink() not running and
+    leaving TypeError Nonetype exception in config.log
+  - Fix Issue #3303 - Handle --config=force overwriting the Environment passed into Configure()'s
+    Decider and not clearing it when the configure context is completed.
+  - Add default paths for yacc tool on windows to include cygwin, mingw, and chocolatey
+  - Fix issue #2799 - Fix mingw tool to respect SHCCCOMSTR, SHLINKCOMSTR and LDMODULECOMSTR
+  - Fix Issue #3329 - Add support for MS SDK V10.0A (which is commonly installed with VS2017)
+  - Fix Issue #3333 - Add support for finding vswhere under 32 bit windows installs.
+  - Update the MSVC tool to include the nologo flag by default in RCFLAGS
+  - Fixed bug which threw error when running SCons on windows system with no MSVC installed.
 
-  CHANGED/ENHANCED EXISTING FUNCTIONALITY
 
-    - List modifications to existing features, where the previous behavior
-      wouldn't actually be considered a bug
+IMPROVEMENTS
+  - Do not store build host+user name if reproducible builds are wanted
 
-  FIXES
 
-    - List fixes of outright bugs
-
-  IMPROVEMENTS
-
-    - List improvements that wouldn't be visible to the user in the
-      documentation:  performance improvements (describe the circumstances
-      under which they would be observed), or major code cleanups
-
-  PACKAGING
-
-    - List changes in the way SCons is packaged and/or released
-
-  DOCUMENTATION
-
-    - List any significant changes to the documentation (not individual
-      typo fixes, even if they're mentioned in src/CHANGES.txt to give
-      the contributor credit)
-
-  DEVELOPMENT
-
-    - List visible changes in the way SCons is developed
-
-  Thanks to CURLY, LARRY, and MOE for their contributions to this release.
-  Contributors are listed alphabetically by their last name.
-
-Copyright (c) 2001 - 2017 The SCons Foundation
-src/RELEASE.txt rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog
+git shortlog --no-merges -ns 3.0.4..HEAD
+    34  William Deegan
+    33  Mats Wichmann
+    18  Daniel
+     4  Daniel Moody
+     3  Bernhard M. Wiedemann
+     2  Maciej Kumorek
diff --git a/src/engine/MANIFEST-xml.in b/src/engine/MANIFEST-xml.in
deleted file mode 100644
index cfbfd3a..0000000
--- a/src/engine/MANIFEST-xml.in
+++ /dev/null
@@ -1,8 +0,0 @@
-SCons/*.xml
-SCons/Platform/*.xml
-SCons/Scanner/__init__.xml
-SCons/Script/*.xml
-SCons/Tool/*.xml
-SCons/Tool/docbook/__init__.xml
-SCons/Tool/docbook/utils/xmldepend.xsl
-SCons/Tool/packaging/__init__.xml
diff --git a/src/engine/MANIFEST.in b/src/engine/MANIFEST.in
index 2df278e..39aba6c 100644
--- a/src/engine/MANIFEST.in
+++ b/src/engine/MANIFEST.in
@@ -18,7 +18,6 @@ SCons/Node/__init__.py
 SCons/Node/Alias.py
 SCons/Node/FS.py
 SCons/Node/Python.py
-SCons/Options/*.py
 SCons/PathList.py
 SCons/Platform/__init__.py
 SCons/Platform/aix.py
@@ -27,9 +26,11 @@ SCons/Platform/darwin.py
 SCons/Platform/hpux.py
 SCons/Platform/irix.py
 SCons/Platform/os2.py
+SCons/Platform/mingw.py
 SCons/Platform/posix.py
 SCons/Platform/sunos.py
 SCons/Platform/win32.py
+SCons/Platform/virtualenv.py
 SCons/Scanner/__init__.py
 SCons/Scanner/C.py
 SCons/Scanner/D.py
@@ -64,6 +65,7 @@ SCons/Tool/c++.py
 SCons/Tool/cxx.py
 SCons/Tool/cc.py
 SCons/Tool/cyglink.py
+SCons/Tool/clangCommon/__init__.py
 SCons/Tool/clang.py
 SCons/Tool/clangxx.py
 SCons/Tool/cvf.py
@@ -177,3 +179,5 @@ SCons/Tool/msgfmt.py
 SCons/Tool/msginit.py
 SCons/Tool/msgmerge.py
 SCons/Tool/xgettext.py
+#SCons/Tool/docbook/docbook-xsl-1.76.1/**
+#SCons/Tool/docbook/utils/**
diff --git a/src/engine/SCons/Action.py b/src/engine/SCons/Action.py
index 97040a4..f1ca2cf 100644
--- a/src/engine/SCons/Action.py
+++ b/src/engine/SCons/Action.py
@@ -77,7 +77,7 @@ way for wrapping up the functions.
 
 """
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -98,7 +98,7 @@ way for wrapping up the functions.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Action.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Action.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import pickle
@@ -107,6 +107,7 @@ import sys
 import subprocess
 import itertools
 import inspect
+from collections import OrderedDict
 
 import SCons.Debug
 from SCons.Debug import logInstanceCreation
@@ -115,8 +116,7 @@ import SCons.Util
 import SCons.Subst
 
 # we use these a lot, so try to optimize them
-is_String = SCons.Util.is_String
-is_List = SCons.Util.is_List
+from SCons.Util import is_String, is_List
 
 class _null(object):
     pass
@@ -258,8 +258,7 @@ def _code_contents(code, docstring=None):
     # function. Note that we have to call _object_contents on each
     # constants because the code object of nested functions can
     # show-up among the constants.
-
-    z = [_object_contents(cc) for cc in code.co_consts[1:]]
+    z = [_object_contents(cc) for cc in code.co_consts if cc != docstring]
     contents.extend(b',(')
     contents.extend(bytearray(',', 'utf-8').join(z))
     contents.extend(b')')
@@ -803,7 +802,7 @@ def _subproc(scons_env, cmd, error = 'ignore', **kw):
     kw['env'] = new_env
 
     try:
-        return subprocess.Popen(cmd, **kw)
+        pobj =  subprocess.Popen(cmd, **kw)
     except EnvironmentError as e:
         if error == 'raise': raise
         # return a dummy Popen instance that only returns error
@@ -817,7 +816,13 @@ def _subproc(scons_env, cmd, error = 'ignore', **kw):
                 def readline(self): return ''
                 def __iter__(self): return iter(())
             stdout = stderr = f()
-        return dummyPopen(e)
+        pobj = dummyPopen(e)
+    finally:
+        # clean up open file handles stored in parent's kw
+        for k, v in kw.items():
+            if hasattr(v, 'close'):
+                v.close()
+        return pobj
 
 
 class CommandAction(_ActionAction):
@@ -837,8 +842,8 @@ class CommandAction(_ActionAction):
         _ActionAction.__init__(self, **kw)
         if is_List(cmd):
             if [c for c in cmd if is_List(c)]:
-                raise TypeError("CommandAction should be given only " \
-                      "a single command")
+                raise TypeError("CommandAction should be given only "
+                                "a single command")
         self.cmd_list = cmd
 
     def __str__(self):
@@ -1289,7 +1294,7 @@ class ListAction(ActionBase):
         return result
 
     def get_varlist(self, target, source, env, executor=None):
-        result = SCons.Util.OrderedDict()
+        result = OrderedDict()
         for act in self.list:
             for var in act.get_varlist(target, source, env, executor):
                 result[var] = True
diff --git a/src/engine/SCons/Action.xml b/src/engine/SCons/Action.xml
index 99f4e86..9cb186c 100644
--- a/src/engine/SCons/Action.xml
+++ b/src/engine/SCons/Action.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/ActionTests.py b/src/engine/SCons/ActionTests.py
index ed2412b..1b11eea 100644
--- a/src/engine/SCons/ActionTests.py
+++ b/src/engine/SCons/ActionTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,8 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/ActionTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/ActionTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
+
 
 # Define a null function and a null class for use as builder actions.
 # Where these are defined in the file seems to affect their byte-code
@@ -30,10 +31,12 @@ __revision__ = "src/engine/SCons/ActionTests.py rel_3.0.0:4395:8972f6a2f699 2017
 def GlobalFunc():
     pass
 
+
 class GlobalActFunc(object):
     def __call__(self):
         pass
 
+
 import collections
 import io
 import os
@@ -47,7 +50,6 @@ import SCons.Environment
 import SCons.Errors
 
 import TestCmd
-import TestUnit
 
 # Initial setup of the common environment for all tests,
 # a temporary working directory containing a
@@ -56,29 +58,32 @@ import TestUnit
 # We don't do this as a setUp() method because it's
 # unnecessary to create a separate directory and script
 # for each test, they can just use the one.
-test = TestCmd.TestCmd(workdir = '')
+test = TestCmd.TestCmd(workdir='')
 
 test.write('act.py', """\
 import os, string, sys
-f = open(sys.argv[1], 'w')
-f.write("act.py: '" + "' '".join(sys.argv[2:]) + "'\\n")
-try:
-    if sys.argv[3]:
-        f.write("act.py: '" + os.environ[sys.argv[3]] + "'\\n")
-except:
-    pass
-f.close()
+
+with open(sys.argv[1], 'w') as f:
+    f.write("act.py: '" + "' '".join(sys.argv[2:]) + "'\\n")
+    try:
+        if sys.argv[3]:
+            f.write("act.py: '" + os.environ[sys.argv[3]] + "'\\n")
+    except:
+        pass
+
 if 'ACTPY_PIPE' in os.environ:
     if 'PIPE_STDOUT_FILE' in os.environ:
-         stdout_msg = open(os.environ['PIPE_STDOUT_FILE'], 'r').read()
+         with open(os.environ['PIPE_STDOUT_FILE'], 'r') as f:
+             stdout_msg = f.read()
     else:
          stdout_msg = "act.py: stdout: executed act.py %s\\n" % ' '.join(sys.argv[1:])
     sys.stdout.write( stdout_msg )
     if 'PIPE_STDERR_FILE' in os.environ:
-         stderr_msg = open(os.environ['PIPE_STDERR_FILE'], 'r').read()
+         with open(os.environ['PIPE_STDERR_FILE'], 'r') as f:
+             stderr_msg = f.read()
     else:
          stderr_msg = "act.py: stderr: executed act.py %s\\n" % ' '.join(sys.argv[1:])
-    sys.stderr.write( stderr_msg )
+    sys.stderr.write(stderr_msg)
 sys.exit(0)
 """)
 
@@ -100,6 +105,7 @@ scons_env = SCons.Environment.Environment()
 # so it doesn't clutter the output.
 sys.stdout = io.StringIO()
 
+
 class CmdStringHolder(object):
     def __init__(self, cmd, literal=None):
         self.data = str(cmd)
@@ -125,6 +131,7 @@ class CmdStringHolder(object):
         else:
             return self.data
 
+
 class Environment(object):
     def __init__(self, **kw):
         self.d = {}
@@ -134,53 +141,70 @@ class Environment(object):
         self.d['ESCAPE'] = scons_env['ESCAPE']
         for k, v in kw.items():
             self.d[k] = v
+
     # Just use the underlying scons_subst*() utility methods.
     def subst(self, strSubst, raw=0, target=[], source=[], conv=None):
         return SCons.Subst.scons_subst(strSubst, self, raw,
                                        target, source, self.d, conv=conv)
+
     subst_target_source = subst
+
     def subst_list(self, strSubst, raw=0, target=[], source=[], conv=None):
         return SCons.Subst.scons_subst_list(strSubst, self, raw,
-                                       target, source, self.d, conv=conv)
+                                            target, source, self.d, conv=conv)
+
     def __getitem__(self, item):
         return self.d[item]
+
     def __setitem__(self, item, value):
         self.d[item] = value
+
     def has_key(self, item):
         return item in self.d
+
     def get(self, key, value=None):
         return self.d.get(key, value)
+
     def items(self):
         return list(self.d.items())
+
     def Dictionary(self):
         return self.d
+
     def Clone(self, **kw):
         res = Environment()
         res.d = SCons.Util.semi_deepcopy(self.d)
         for k, v in kw.items():
             res.d[k] = v
         return res
+
     def sig_dict(self):
         d = {}
-        for k,v in self.items(): d[k] = v
+        for k, v in self.items(): d[k] = v
         d['TARGETS'] = ['__t1__', '__t2__', '__t3__', '__t4__', '__t5__', '__t6__']
         d['TARGET'] = d['TARGETS'][0]
         d['SOURCES'] = ['__s1__', '__s2__', '__s3__', '__s4__', '__s5__', '__s6__']
         d['SOURCE'] = d['SOURCES'][0]
         return d
 
+
 class DummyNode(object):
     def __init__(self, name):
         self.name = name
+
     def str_for_display(self):
         return '"' + self.name + '"'
+
     def __str__(self):
         return self.name
+
     def rfile(self):
         return self
+
     def get_subst_proxy(self):
         return self
 
+
 if os.name == 'java':
     python = os.path.join(sys.prefix, 'jython')
 else:
@@ -189,6 +213,7 @@ _python_ = test.escape(python)
 
 _null = SCons.Action._null
 
+
 def test_varlist(pos_call, str_call, cmd, cmdstrfunc, **kw):
     def call_action(a, pos_call=pos_call, str_call=str_call, kw=kw):
         a = SCons.Action.Action(*a, **kw)
@@ -226,6 +251,7 @@ def test_varlist(pos_call, str_call, cmd, cmdstrfunc, **kw):
     a = call_action((cmd, cmdstrfunc, 'a', 'b', 'c'))
     assert a.varlist == ('a', 'b', 'c', 'x', 'y', 'z'), a.varlist
 
+
 def test_positional_args(pos_callback, cmd, **kw):
     """Test that Action() returns the expected type and that positional args work.
     """
@@ -235,7 +261,9 @@ def test_positional_args(pos_callback, cmd, **kw):
 
     if not isinstance(act, SCons.Action._ActionAction):
         # only valid cmdstrfunc is None
-        def none(a): pass
+        def none(a):
+            pass
+
         test_varlist(pos_callback, none, cmd, None, **kw)
     else:
         # _ActionAction should have set these
@@ -244,22 +272,27 @@ def test_positional_args(pos_callback, cmd, **kw):
         assert act.presub is _null, act.presub
         assert act.chdir is None, act.chdir
         assert act.exitstatfunc is SCons.Action.default_exitstatfunc, \
-                                        act.exitstatfunc
+            act.exitstatfunc
 
         def cmdstr(a):
             assert hasattr(a, 'strfunction')
             assert a.cmdstr == 'cmdstr', a.cmdstr
+
         test_varlist(pos_callback, cmdstr, cmd, 'cmdstr', **kw)
 
-        def fun(): pass
+        def fun():
+            pass
+
         def strfun(a, fun=fun):
             assert a.strfunction is fun, a.strfunction
             assert a.cmdstr == _null, a.cmdstr
+
         test_varlist(pos_callback, strfun, cmd, fun, **kw)
 
         def none(a):
             assert hasattr(a, 'strfunction')
             assert a.cmdstr is None, a.cmdstr
+
         test_varlist(pos_callback, none, cmd, None, **kw)
 
         """Test handling of bad cmdstrfunc arguments """
@@ -274,18 +307,21 @@ def test_positional_args(pos_callback, cmd, **kw):
 
     return act
 
+
 class ActionTestCase(unittest.TestCase):
     """Test the Action() factory function"""
 
     def test_FunctionAction(self):
         """Test the Action() factory's creation of FunctionAction objects
         """
+
         def foo():
             pass
 
         def func_action(a, foo=foo):
             assert isinstance(a, SCons.Action.FunctionAction), a
             assert a.execfunction == foo, a.execfunction
+
         test_positional_args(func_action, foo)
         # a singleton list returns the contained action
         test_positional_args(func_action, [foo])
@@ -293,28 +329,33 @@ class ActionTestCase(unittest.TestCase):
     def test_CommandAction(self):
         """Test the Action() factory's creation of CommandAction objects
         """
+
         def cmd_action(a):
             assert isinstance(a, SCons.Action.CommandAction), a
             assert a.cmd_list == "string", a.cmd_list
+
         test_positional_args(cmd_action, "string")
         # a singleton list returns the contained action
         test_positional_args(cmd_action, ["string"])
 
-        try: unicode
-        except NameError: pass
+        try:
+            unicode
+        except NameError:
+            pass
         else:
             a2 = eval("SCons.Action.Action(u'string')")
             assert isinstance(a2, SCons.Action.CommandAction), a2
 
         def line_action(a):
             assert isinstance(a, SCons.Action.CommandAction), a
-            assert a.cmd_list == [ "explicit", "command", "line" ], a.cmd_list
-        test_positional_args(line_action, [[ "explicit", "command", "line" ]])
+            assert a.cmd_list == ["explicit", "command", "line"], a.cmd_list
+
+        test_positional_args(line_action, [["explicit", "command", "line"]])
 
     def test_ListAction(self):
         """Test the Action() factory's creation of ListAction objects
         """
-        a1 = SCons.Action.Action(["x", "y", "z", [ "a", "b", "c"]])
+        a1 = SCons.Action.Action(["x", "y", "z", ["a", "b", "c"]])
         assert isinstance(a1, SCons.Action.ListAction), a1
         assert a1.varlist == (), a1.varlist
         assert isinstance(a1.list[0], SCons.Action.CommandAction), a1.list[0]
@@ -324,7 +365,7 @@ class ActionTestCase(unittest.TestCase):
         assert isinstance(a1.list[2], SCons.Action.CommandAction), a1.list[2]
         assert a1.list[2].cmd_list == "z", a1.list[2].cmd_list
         assert isinstance(a1.list[3], SCons.Action.CommandAction), a1.list[3]
-        assert a1.list[3].cmd_list == [ "a", "b", "c" ], a1.list[3].cmd_list
+        assert a1.list[3].cmd_list == ["a", "b", "c"], a1.list[3].cmd_list
 
         a2 = SCons.Action.Action("x\ny\nz")
         assert isinstance(a2, SCons.Action.ListAction), a2
@@ -372,20 +413,24 @@ class ActionTestCase(unittest.TestCase):
     def test_CommandGeneratorAction(self):
         """Test the Action() factory's creation of CommandGeneratorAction objects
         """
+
         def foo(): pass
 
         def gen_action(a, foo=foo):
             assert isinstance(a, SCons.Action.CommandGeneratorAction), a
             assert a.generator is foo, a.generator
+
         test_positional_args(gen_action, foo, generator=1)
 
     def test_LazyCmdGeneratorAction(self):
         """Test the Action() factory's creation of lazy CommandGeneratorAction objects
         """
+
         def lazy_action(a):
             assert isinstance(a, SCons.Action.LazyAction), a
             assert a.var == "FOO", a.var
             assert a.cmd_list == "${FOO}", a.cmd_list
+
         test_positional_args(lazy_action, "$FOO")
         test_positional_args(lazy_action, "${FOO}")
 
@@ -406,6 +451,7 @@ class ActionTestCase(unittest.TestCase):
         a2 = SCons.Action.Action(a1)
         assert a2 is a1, a2
 
+
 class _ActionActionTestCase(unittest.TestCase):
 
     def test__init__(self):
@@ -429,7 +475,7 @@ class _ActionActionTestCase(unittest.TestCase):
         assert a.chdir is None, a.chdir
         assert a.exitstatfunc is SCons.Action.default_exitstatfunc, a.exitstatfunc
 
-        assert SCons.Action._ActionAction(kwarg = 1)
+        assert SCons.Action._ActionAction(kwarg=1)
         assert not hasattr(a, 'kwarg')
         assert not hasattr(a, 'strfunction')
         assert a.cmdstr is _null, a.cmdstr
@@ -447,13 +493,13 @@ class _ActionActionTestCase(unittest.TestCase):
 
         a = SCons.Action._ActionAction(cmdstr='cmdstr')
         assert not hasattr(a, 'strfunction')
-        assert a.cmdstr is 'cmdstr', a.cmdstr
+        assert a.cmdstr == 'cmdstr', a.cmdstr
 
         a = SCons.Action._ActionAction(cmdstr=None)
         assert not hasattr(a, 'strfunction')
         assert a.cmdstr is None, a.cmdstr
 
-        t = ('a','b','c')
+        t = ('a', 'b', 'c')
         a = SCons.Action._ActionAction(varlist=t)
         assert a.varlist == t, a.varlist
 
@@ -461,22 +507,22 @@ class _ActionActionTestCase(unittest.TestCase):
         assert a.presub is func1, a.presub
 
         a = SCons.Action._ActionAction(chdir=1)
-        assert a.chdir is 1, a.chdir
+        assert a.chdir == 1, a.chdir
 
         a = SCons.Action._ActionAction(exitstatfunc=func1)
         assert a.exitstatfunc is func1, a.exitstatfunc
 
         a = SCons.Action._ActionAction(
-                                 # alphabetical order ...
-                                 chdir='x',
-                                 cmdstr='cmdstr',
-                                 exitstatfunc=func3,
-                                 presub=func2,
-                                 strfunction=func1,
-                                 varlist=t,
-                          )
-        assert a.chdir is 'x', a.chdir
-        assert a.cmdstr is 'cmdstr', a.cmdstr
+            # alphabetical order ...
+            chdir='x',
+            cmdstr='cmdstr',
+            exitstatfunc=func3,
+            presub=func2,
+            strfunction=func1,
+            varlist=t,
+        )
+        assert a.chdir == 'x', a.chdir
+        assert a.cmdstr == 'cmdstr', a.cmdstr
         assert a.exitstatfunc is func3, a.exitstatfunc
         assert a.presub is func2, a.presub
         assert a.strfunction is func1, a.strfunction
@@ -485,7 +531,10 @@ class _ActionActionTestCase(unittest.TestCase):
     def test_dup_keywords(self):
         """Test handling of both cmdstr and strfunction arguments
         """
-        def func(): pass
+
+        def func():
+            pass
+
         try:
             a = SCons.Action.Action('foo', cmdstr='string', strfunction=func)
         except SCons.Errors.UserError as e:
@@ -513,6 +562,7 @@ class _ActionActionTestCase(unittest.TestCase):
         try:
             def execfunc(target, source, env):
                 pass
+
             a = SCons.Action.Action(execfunc)
 
             sio = io.StringIO()
@@ -532,9 +582,9 @@ class _ActionActionTestCase(unittest.TestCase):
         save_print_actions = SCons.Action.print_actions
         save_print_actions_presub = SCons.Action.print_actions_presub
         save_execute_actions = SCons.Action.execute_actions
-        #SCons.Action.print_actions = 0
+        # SCons.Action.print_actions = 0
 
-        test = TestCmd.TestCmd(workdir = '')
+        test = TestCmd.TestCmd(workdir='')
         test.subdir('sub', 'xyz')
         os.chdir(test.workpath())
 
@@ -545,16 +595,19 @@ class _ActionActionTestCase(unittest.TestCase):
                 assert isinstance(target, list), type(target)
                 assert isinstance(source, list), type(source)
                 return 7
+
             a = SCons.Action.Action(execfunc)
 
             def firstfunc(target, source, env):
                 assert isinstance(target, list), type(target)
                 assert isinstance(source, list), type(source)
                 return 0
+
             def lastfunc(target, source, env):
                 assert isinstance(target, list), type(target)
                 assert isinstance(source, list), type(source)
                 return 9
+
             b = SCons.Action.Action([firstfunc, execfunc, lastfunc])
 
             sio = io.StringIO()
@@ -694,8 +747,10 @@ class _ActionActionTestCase(unittest.TestCase):
             SCons.Action.execute_actions = 1
 
             result = []
+
             def my_print_cmd_line(s, target, source, env, result=result):
                 result.append(s)
+
             env['PRINT_CMD_LINE_FUNC'] = my_print_cmd_line
             a("output", "input", env)
             assert result == ["execfunc(['output'], ['input'])"], result
@@ -721,39 +776,43 @@ class _ActionActionTestCase(unittest.TestCase):
 
         def func():
             pass
+
         a = SCons.Action.Action(func)
         s = a.presub_lines(env)
         assert s == ["func(target, source, env)"], s
 
         def gen(target, source, env, for_signature):
             return 'generat' + env.get('GEN', 'or')
+
         a = SCons.Action.Action(gen, generator=1)
         s = a.presub_lines(env)
         assert s == ["generator"], s
-        s = a.presub_lines(Environment(GEN = 'ed'))
+        s = a.presub_lines(Environment(GEN='ed'))
         assert s == ["generated"], s
 
         a = SCons.Action.Action("$ACT")
         s = a.presub_lines(env)
         assert s == [''], s
-        s = a.presub_lines(Environment(ACT = 'expanded action'))
+        s = a.presub_lines(Environment(ACT='expanded action'))
         assert s == ['expanded action'], s
 
     def test_add(self):
         """Test adding Actions to stuff."""
+
         # Adding actions to other Actions or to stuff that can
         # be converted into an Action should produce a ListAction
         # containing all the Actions.
         def bar():
             return None
+
         baz = SCons.Action.Action(bar, generator=1)
         act1 = SCons.Action.Action('foo bar')
-        act2 = SCons.Action.Action([ 'foo', bar ])
+        act2 = SCons.Action.Action(['foo', bar])
 
         sum = act1 + act2
         assert isinstance(sum, SCons.Action.ListAction), str(sum)
         assert len(sum.list) == 3, len(sum.list)
-        assert [isinstance(x, SCons.Action.ActionBase) for x in sum.list] == [ 1, 1, 1 ]
+        assert [isinstance(x, SCons.Action.ActionBase) for x in sum.list] == [1, 1, 1]
 
         sum = act1 + act1
         assert isinstance(sum, SCons.Action.ListAction), str(sum)
@@ -789,13 +848,13 @@ class _ActionActionTestCase(unittest.TestCase):
         assert len(sum.list) == 3, len(sum.list)
         assert isinstance(sum.list[0], SCons.Action.CommandAction)
 
-        sum = [ 'foo', 'bar' ] + act1
+        sum = ['foo', 'bar'] + act1
         assert isinstance(sum, SCons.Action.ListAction), str(sum)
         assert len(sum.list) == 3, sum.list
         assert isinstance(sum.list[0], SCons.Action.CommandAction)
         assert isinstance(sum.list[1], SCons.Action.CommandAction)
 
-        sum = act2 + [ baz, bar ]
+        sum = act2 + [baz, bar]
         assert isinstance(sum, SCons.Action.ListAction), str(sum)
         assert len(sum.list) == 4, len(sum.list)
         assert isinstance(sum.list[2], SCons.Action.CommandGeneratorAction)
@@ -822,17 +881,18 @@ class _ActionActionTestCase(unittest.TestCase):
         else:
             assert 0, "Should have thrown a TypeError adding to an int."
 
+
 class CommandActionTestCase(unittest.TestCase):
 
     def test___init__(self):
         """Test creation of a command Action
         """
         a = SCons.Action.CommandAction(["xyzzy"])
-        assert a.cmd_list == [ "xyzzy" ], a.cmd_list
+        assert a.cmd_list == ["xyzzy"], a.cmd_list
         assert a.cmdstr is _null, a.cmdstr
 
         a = SCons.Action.CommandAction(["abra"], cmdstr="cadabra")
-        assert a.cmd_list == [ "abra" ], a.cmd_list
+        assert a.cmd_list == ["abra"], a.cmd_list
         assert a.cmdstr == "cadabra", a.cmdstr
 
     def test___str__(self):
@@ -952,6 +1012,7 @@ class CommandActionTestCase(unittest.TestCase):
 
         def sf(target, source, env):
             return "sf was called"
+
         act = SCons.Action.CommandAction('foo', strfunction=sf)
         s = act.strfunction([], [], env)
         assert s == "sf was called", s
@@ -959,26 +1020,35 @@ class CommandActionTestCase(unittest.TestCase):
         class actclass1(object):
             def __init__(self, targets, sources, env):
                 pass
+
             def __call__(self):
                 return 1
+
         class actclass2(object):
             def __init__(self, targets, sources, env):
                 self.strfunction = 5
+
             def __call__(self):
                 return 2
+
         class actclass3(object):
             def __init__(self, targets, sources, env):
                 pass
+
             def __call__(self):
                 return 3
+
             def strfunction(self, targets, sources, env):
-                return 'actclass3 on %s to get %s'%(str(sources[0]),
-                                                    str(targets[0]))
+                return 'actclass3 on %s to get %s' % (str(sources[0]),
+                                                      str(targets[0]))
+
         class actclass4(object):
             def __init__(self, targets, sources, env):
                 pass
+
             def __call__(self):
                 return 4
+
             strfunction = None
 
         act1 = SCons.Action.Action(actclass1([t1], [s1], env))
@@ -1075,7 +1145,7 @@ class CommandActionTestCase(unittest.TestCase):
         act = SCons.Action.CommandAction(cmd4)
         sources = [DummyNode('three'), DummyNode('four'), DummyNode('five')]
         env2 = env.Clone()
-        r = act([], source = sources, env = env2)
+        r = act([], source=sources, env=env2)
         assert r == 0
         c = test.read(outfile, 'r')
         assert c == "act.py: 'three' 'four'\n", c
@@ -1092,13 +1162,13 @@ class CommandActionTestCase(unittest.TestCase):
             PATH = ''
 
         env5['ENV']['XYZZY'] = 'xyzzy'
-        r = act(target = DummyNode('out5'), source = [], env = env5)
+        r = act(target=DummyNode('out5'), source=[], env=env5)
 
         act = SCons.Action.CommandAction(cmd5)
-        r = act(target = DummyNode('out5'),
-                source = [],
-                env = env.Clone(ENV = {'XYZZY' : 'xyzzy5',
-                                      'PATH' : PATH}))
+        r = act(target=DummyNode('out5'),
+                source=[],
+                env=env.Clone(ENV={'XYZZY': 'xyzzy5',
+                                   'PATH': PATH}))
         assert r == 0
         c = test.read(outfile, 'r')
         assert c == "act.py: 'out5' 'XYZZY'\nact.py: 'xyzzy5'\n", c
@@ -1106,19 +1176,22 @@ class CommandActionTestCase(unittest.TestCase):
         class Obj(object):
             def __init__(self, str):
                 self._str = str
+
             def __str__(self):
                 return self._str
+
             def rfile(self):
                 return self
+
             def get_subst_proxy(self):
                 return self
 
         cmd6 = r'%s %s %s ${TARGETS[1]} $TARGET ${SOURCES[:2]}' % (_python_, act_py, outfile)
 
         act = SCons.Action.CommandAction(cmd6)
-        r = act(target = [Obj('111'), Obj('222')],
-                        source = [Obj('333'), Obj('444'), Obj('555')],
-                        env = env.Clone())
+        r = act(target=[Obj('111'), Obj('222')],
+                source=[Obj('333'), Obj('444'), Obj('555')],
+                env=env.Clone())
         assert r == 0
         c = test.read(outfile, 'r')
         assert c == "act.py: '222' '111' '333' '444'\n", c
@@ -1133,7 +1206,7 @@ class CommandActionTestCase(unittest.TestCase):
             expect_nonexistent = 127
             # Newer cygwin seems to return 126 for following
             expect_nonexecutable_file = 126
-            expect_nonexecutable_dir  = 127
+            expect_nonexecutable_dir = 127
         elif sys.platform.find('sunos') != -1:
             expect_nonexistent = 1
             expect_nonexecutable_file = 1
@@ -1141,22 +1214,22 @@ class CommandActionTestCase(unittest.TestCase):
         else:
             expect_nonexistent = 127
             expect_nonexecutable_file = 126
-            expect_nonexecutable_dir  = 126
+            expect_nonexecutable_dir = 126
 
         # Test that a nonexistent command returns 127
         act = SCons.Action.CommandAction(python + "_no_such_command_")
-        r = act([], [], env.Clone(out = outfile))
+        r = act([], [], env.Clone(out=outfile))
         assert r.status == expect_nonexistent, r.status
 
         # Test that trying to execute a directory returns 126
         dir, tail = os.path.split(python)
         act = SCons.Action.CommandAction(dir)
-        r = act([], [], env.Clone(out = outfile))
+        r = act([], [], env.Clone(out=outfile))
         assert r.status == expect_nonexecutable_file, r.status
 
         # Test that trying to execute a non-executable file returns 126
         act = SCons.Action.CommandAction(outfile)
-        r = act([], [], env.Clone(out = outfile))
+        r = act([], [], env.Clone(out=outfile))
         assert r.status == expect_nonexecutable_dir, r.status
 
         act = SCons.Action.CommandAction('%s %s 1' % (_python_, exit_py))
@@ -1190,51 +1263,59 @@ class CommandActionTestCase(unittest.TestCase):
     def test_set_handler(self):
         """Test setting the command handler...
         """
+
         class Test(object):
             def __init__(self):
                 self.executed = 0
-        t=Test()
+
+        t = Test()
+
         def func(sh, escape, cmd, args, env, test=t):
             test.executed = args
             test.shell = sh
             return 0
+
         def escape_func(cmd):
             return '**' + cmd + '**'
 
         class LiteralStr(object):
             def __init__(self, x):
                 self.data = x
+
             def __str__(self):
                 return self.data
+
             def escape(self, escape_func):
                 return escape_func(self.data)
+
             def is_literal(self):
                 return 1
 
         a = SCons.Action.CommandAction(["xyzzy"])
-        e = Environment(SPAWN = func)
+        e = Environment(SPAWN=func)
         a([], [], e)
-        assert t.executed == [ 'xyzzy' ], t.executed
+        assert t.executed == ['xyzzy'], t.executed
 
         a = SCons.Action.CommandAction(["xyzzy"])
-        e = Environment(SPAWN = '$FUNC', FUNC = func)
+        e = Environment(SPAWN='$FUNC', FUNC=func)
         a([], [], e)
-        assert t.executed == [ 'xyzzy' ], t.executed
+        assert t.executed == ['xyzzy'], t.executed
 
         a = SCons.Action.CommandAction(["xyzzy"])
-        e = Environment(SPAWN = func, SHELL = 'fake shell')
+        e = Environment(SPAWN=func, SHELL='fake shell')
         a([], [], e)
-        assert t.executed == [ 'xyzzy' ], t.executed
+        assert t.executed == ['xyzzy'], t.executed
         assert t.shell == 'fake shell', t.shell
 
-        a = SCons.Action.CommandAction([ LiteralStr("xyzzy") ])
-        e = Environment(SPAWN = func, ESCAPE = escape_func)
+        a = SCons.Action.CommandAction([LiteralStr("xyzzy")])
+        e = Environment(SPAWN=func, ESCAPE=escape_func)
         a([], [], e)
-        assert t.executed == [ '**xyzzy**' ], t.executed
+        assert t.executed == ['**xyzzy**'], t.executed
 
     def test_get_contents(self):
         """Test fetching the contents of a command Action
         """
+
         def CmdGen(target, source, env, for_signature):
             assert for_signature
             return "%s %s" % \
@@ -1242,10 +1323,10 @@ class CommandActionTestCase(unittest.TestCase):
 
         # The number 1 is there to make sure all args get converted to strings.
         a = SCons.Action.CommandAction(["|", "$(", "$foo", "|", "$(", "$bar",
-                                        "$)", "stuff",  "$)", "|", "$baz", 1])
+                                        "$)", "stuff", "$)", "|", "$baz", 1])
         c = a.get_contents(target=[], source=[],
-                           env=Environment(foo = 'FFF', bar = 'BBB',
-                                           baz = CmdGen))
+                           env=Environment(foo='FFF', bar='BBB',
+                                           baz=CmdGen))
         assert c == b"| | FFF BBB 1", c
 
         # Make sure that CommandActions use an Environment's
@@ -1254,9 +1335,9 @@ class CommandActionTestCase(unittest.TestCase):
             def subst_target_source(self, strSubst, raw=0, target=[], source=[]):
                 return 'subst_target_source: ' + strSubst
 
-        c = a.get_contents(target=DummyNode('ttt'), source = DummyNode('sss'),
-                           env=SpecialEnvironment(foo = 'GGG', bar = 'CCC',
-                                                  baz = 'ZZZ'))
+        c = a.get_contents(target=DummyNode('ttt'), source=DummyNode('sss'),
+                           env=SpecialEnvironment(foo='GGG', bar='CCC',
+                                                  baz='ZZZ'))
         assert c == b'subst_target_source: | $( $foo | $( $bar $) stuff $) | $baz 1', c
 
         # We've discussed using the real target and source names in a
@@ -1304,6 +1385,7 @@ class CommandActionTestCase(unittest.TestCase):
         c = a.get_contents(target=t, source=s, env=env)
         assert c == b"s4 s5", c
 
+
 class CommandGeneratorActionTestCase(unittest.TestCase):
 
     def factory(self, act, **kw):
@@ -1313,16 +1395,18 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
     def test___init__(self):
         """Test creation of a command generator Action
         """
+
         def f(target, source, env):
             pass
+
         a = self.factory(f)
         assert a.generator == f
 
     def test___str__(self):
         """Test the pre-substitution strings for command generator Actions
         """
-        def f(target, source, env, for_signature, self=self):
 
+        def f(target, source, env, for_signature, self=self):
             # See if "env" is really a construction environment (or
             # looks like one) by accessing the FindIxes attribute.
             # (The Tool/mingw.py module has a generator that uses this,
@@ -1331,6 +1415,7 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
 
             env.FindIxes
             return "FOO"
+
         a = self.factory(f)
         s = str(a)
         assert s == 'FOO', s
@@ -1338,10 +1423,12 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
     def test_genstring(self):
         """Test the command generator Action genstring() method
         """
+
         def f(target, source, env, for_signature, self=self):
             dummy = env['dummy']
             self.dummy = dummy
             return "$FOO $TARGET $SOURCE $TARGETS $SOURCES"
+
         a = self.factory(f)
         self.dummy = 0
         s = a.genstring([], [], env=Environment(FOO='xyzzy', dummy=1))
@@ -1358,13 +1445,16 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
             s = env.subst("$FOO")
             assert s == 'foo baz\nbar ack', s
             return "$FOO"
+
         def func_action(target, source, env, self=self):
-            dummy=env['dummy']
+            dummy = env['dummy']
             s = env.subst('$foo')
             assert s == 'bar', s
-            self.dummy=dummy
+            self.dummy = dummy
+
         def f2(target, source, env, for_signature, f=func_action):
             return f
+
         def ch(sh, escape, cmd, args, env, self=self):
             self.cmd.append(cmd)
             self.args.append(args)
@@ -1373,30 +1463,34 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
         self.dummy = 0
         self.cmd = []
         self.args = []
-        a([], [], env=Environment(FOO = 'foo baz\nbar ack',
-                                          dummy = 1,
-                                          SPAWN = ch))
+        a([], [], env=Environment(FOO='foo baz\nbar ack',
+                                  dummy=1,
+                                  SPAWN=ch))
         assert self.dummy == 1, self.dummy
         assert self.cmd == ['foo', 'bar'], self.cmd
-        assert self.args == [[ 'foo', 'baz' ], [ 'bar', 'ack' ]], self.args
+        assert self.args == [['foo', 'baz'], ['bar', 'ack']], self.args
 
         b = self.factory(f2)
         self.dummy = 0
-        b(target=[], source=[], env=Environment(foo =  'bar',
-                                                        dummy =  2 ))
-        assert self.dummy==2, self.dummy
+        b(target=[], source=[], env=Environment(foo='bar',
+                                                dummy=2))
+        assert self.dummy == 2, self.dummy
         del self.dummy
 
         class DummyFile(object):
             def __init__(self, t):
                 self.t = t
+
             def rfile(self):
                 self.t.rfile_called = 1
                 return self
+
             def get_subst_proxy(self):
                 return self
+
         def f3(target, source, env, for_signature):
             return ''
+
         c = self.factory(f3)
         c(target=[], source=DummyFile(self), env=Environment())
         assert self.rfile_called
@@ -1404,19 +1498,20 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
     def test_get_contents(self):
         """Test fetching the contents of a command generator Action
         """
+
         def f(target, source, env, for_signature):
             foo = env['foo']
             bar = env['bar']
             assert for_signature, for_signature
             return [["guux", foo, "$(", "$ignore", "$)", bar,
-                     '${test("$( foo $bar $)")}' ]]
+                     '${test("$( foo $bar $)")}']]
 
         def test(mystr):
             assert mystr == "$( foo $bar $)", mystr
             return "test"
 
-        env = Environment(foo = 'FFF', bar =  'BBB',
-                          ignore = 'foo', test=test)
+        env = Environment(foo='FFF', bar='BBB',
+                          ignore='foo', test=test)
         a = self.factory(f)
         c = a.get_contents(target=[], source=[], env=env)
         assert c == b"guux FFF BBB test", c
@@ -1430,9 +1525,10 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
 
         # Since the python bytecode has per version differences, we need different expected results per version
         func_matches = {
-            (2,7) : bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,5) : bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,6) : bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (2, 7): bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 5): bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 6): bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (3, 7): bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
         }
 
         meth_matches = [
@@ -1446,15 +1542,17 @@ class CommandGeneratorActionTestCase(unittest.TestCase):
         def f_local(target, source, env, for_signature):
             return SCons.Action.Action(LocalFunc)
 
-        env = Environment(XYZ = 'foo')
+        env = Environment(XYZ='foo')
 
         a = self.factory(f_global)
         c = a.get_contents(target=[], source=[], env=env)
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected \n"+repr(func_matches[sys.version_info[:2]])
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected \n" + repr(
+            func_matches[sys.version_info[:2]])
 
         a = self.factory(f_local)
         c = a.get_contents(target=[], source=[], env=env)
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected \n"+repr(func_matches[sys.version_info[:2]])
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected \n" + repr(
+            func_matches[sys.version_info[:2]])
 
         def f_global(target, source, env, for_signature):
             return SCons.Action.Action(GlobalFunc, varlist=['XYZ'])
@@ -1478,12 +1576,16 @@ class FunctionActionTestCase(unittest.TestCase):
     def test___init__(self):
         """Test creation of a function Action
         """
+
         def func1():
             pass
+
         def func2():
             pass
+
         def func3():
             pass
+
         def func4():
             pass
 
@@ -1491,15 +1593,17 @@ class FunctionActionTestCase(unittest.TestCase):
         assert a.execfunction == func1, a.execfunction
         assert isinstance(a.strfunction, types.MethodType), type(a.strfunction)
 
-        a = SCons.Action.FunctionAction(func2, { 'strfunction' : func3 })
+        a = SCons.Action.FunctionAction(func2, {'strfunction': func3})
         assert a.execfunction == func2, a.execfunction
         assert a.strfunction == func3, a.strfunction
 
     def test___str__(self):
         """Test the __str__() method for function Actions
         """
+
         def func1():
             pass
+
         a = SCons.Action.FunctionAction(func1, {})
         s = str(a)
         assert s == "func1(target, source, env)", s
@@ -1507,6 +1611,7 @@ class FunctionActionTestCase(unittest.TestCase):
         class class1(object):
             def __call__(self):
                 pass
+
         a = SCons.Action.FunctionAction(class1(), {})
         s = str(a)
         assert s == "class1(target, source, env)", s
@@ -1515,22 +1620,25 @@ class FunctionActionTestCase(unittest.TestCase):
         """Test executing a function Action
         """
         self.inc = 0
+
         def f(target, source, env):
             s = env['s']
             s.inc = s.inc + 1
             s.target = target
-            s.source=source
+            s.source = source
             assert env.subst("$BAR") == 'foo bar', env.subst("$BAR")
             return 0
+
         a = SCons.Action.FunctionAction(f, {})
-        a(target=1, source=2, env=Environment(BAR = 'foo bar',
-                                                      s = self))
+        a(target=1, source=2, env=Environment(BAR='foo bar',
+                                              s=self))
         assert self.inc == 1, self.inc
         assert self.source == [2], self.source
         assert self.target == [1], self.target
 
         global count
         count = 0
+
         def function1(target, source, env):
             global count
             count = count + 1
@@ -1540,7 +1648,7 @@ class FunctionActionTestCase(unittest.TestCase):
             return 1
 
         act = SCons.Action.FunctionAction(function1, {})
-        r = act(target = [outfile, outfile2], source=[], env=Environment())
+        r = act(target=[outfile, outfile2], source=[], env=Environment())
         assert r.status == 1, r.status
 
         assert count == 1, count
@@ -1555,7 +1663,7 @@ class FunctionActionTestCase(unittest.TestCase):
                     f.write("class1a\n")
 
         act = SCons.Action.FunctionAction(class1a, {})
-        r = act([], [], Environment(out = outfile))
+        r = act([], [], Environment(out=outfile))
         assert isinstance(r.status, class1a), r.status
         c = test.read(outfile, 'r')
         assert c == "class1a\n", c
@@ -1567,7 +1675,7 @@ class FunctionActionTestCase(unittest.TestCase):
                 return 2
 
         act = SCons.Action.FunctionAction(class1b(), {})
-        r = act([], [], Environment(out = outfile))
+        r = act([], [], Environment(out=outfile))
         assert r.status == 2, r.status
         c = test.read(outfile, 'r')
         assert c == "class1b\n", c
@@ -1575,11 +1683,13 @@ class FunctionActionTestCase(unittest.TestCase):
         def build_it(target, source, env, executor=None, self=self):
             self.build_it = 1
             return 0
+
         def string_it(target, source, env, executor=None, self=self):
             self.string_it = 1
             return None
+
         act = SCons.Action.FunctionAction(build_it,
-                                          { 'strfunction' : string_it })
+                                          {'strfunction': string_it})
         r = act([], [], Environment())
         assert r == 0, r
         assert self.build_it
@@ -1593,15 +1703,18 @@ class FunctionActionTestCase(unittest.TestCase):
             pass
 
         func_matches = {
-            (2,7) : bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,5) : bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,6) : bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (2, 7): bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 5): bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 6): bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (3, 7): bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
+
         }
 
         meth_matches = {
-            (2,7) : bytearray(b'1, 1, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,5) : bytearray(b'1, 1, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,6) : bytearray(b'1, 1, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (2, 7): bytearray(b'1, 1, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 5): bytearray(b'1, 1, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 6): bytearray(b'1, 1, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (3, 7): bytearray(b'1, 1, 0, 0,(),(),(d\x00S\x00),(),()'),
         }
 
         def factory(act, **kw):
@@ -1609,18 +1722,20 @@ class FunctionActionTestCase(unittest.TestCase):
 
         a = factory(GlobalFunc)
         c = a.get_contents(target=[], source=[], env=Environment())
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(func_matches[sys.version_info[:2]])
-
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            func_matches[sys.version_info[:2]])
 
         a = factory(LocalFunc)
         c = a.get_contents(target=[], source=[], env=Environment())
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(func_matches[sys.version_info[:2]])
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            func_matches[sys.version_info[:2]])
 
         matches_foo = func_matches[sys.version_info[:2]] + b'foo'
 
         a = factory(GlobalFunc, varlist=['XYZ'])
         c = a.get_contents(target=[], source=[], env=Environment())
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(func_matches[sys.version_info[:2]])
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            func_matches[sys.version_info[:2]])
         # assert c in func_matches, repr(c)
 
         c = a.get_contents(target=[], source=[], env=Environment(XYZ='foo'))
@@ -1631,8 +1746,8 @@ class FunctionActionTestCase(unittest.TestCase):
         a = factory(GlobalFunc, varlist='XYZ')
         c = a.get_contents(target=[], source=[], env=Environment())
         # assert c in func_matches, repr(c)
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(func_matches[sys.version_info[:2]])
-
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            func_matches[sys.version_info[:2]])
 
         c = a.get_contents(target=[], source=[], env=Environment(XYZ='foo'))
         assert c in matches_foo, repr(c)
@@ -1640,6 +1755,7 @@ class FunctionActionTestCase(unittest.TestCase):
         class Foo(object):
             def get_contents(self, target, source, env):
                 return b'xyzzy'
+
         a = factory(Foo())
         c = a.get_contents(target=[], source=[], env=Environment())
         assert c == b'xyzzy', repr(c)
@@ -1647,14 +1763,17 @@ class FunctionActionTestCase(unittest.TestCase):
         class LocalClass(object):
             def LocalMethod(self):
                 pass
+
         lc = LocalClass()
         a = factory(lc.LocalMethod)
         c = a.get_contents(target=[], source=[], env=Environment())
-        assert c == meth_matches[sys.version_info[:2]],  "Got\n"+repr(c)+"\nExpected one of \n"+repr(meth_matches[sys.version_info[:2]])
+        assert c == meth_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            meth_matches[sys.version_info[:2]])
 
     def test_strfunction(self):
         """Test the FunctionAction.strfunction() method
         """
+
         def func():
             pass
 
@@ -1673,13 +1792,16 @@ class FunctionActionTestCase(unittest.TestCase):
         s = a.strfunction(target=[], source=[], env=Environment())
         assert s == 'function', s
 
+
 class ListActionTestCase(unittest.TestCase):
 
     def test___init__(self):
         """Test creation of a list of subsidiary Actions
         """
+
         def func():
             pass
+
         a = SCons.Action.ListAction(["x", func, ["y", "z"]])
         assert isinstance(a.list[0], SCons.Action.CommandAction)
         assert isinstance(a.list[1], SCons.Action.FunctionAction)
@@ -1689,10 +1811,13 @@ class ListActionTestCase(unittest.TestCase):
     def test___str__(self):
         """Test the __str__() method for a list of subsidiary Actions
         """
-        def f(target,source,env):
+
+        def f(target, source, env):
             pass
-        def g(target,source,env):
+
+        def g(target, source, env):
             pass
+
         a = SCons.Action.ListAction([f, g, "XXX", f])
         s = str(a)
         assert s == "f(target, source, env)\ng(target, source, env)\nXXX\nf(target, source, env)", s
@@ -1700,10 +1825,13 @@ class ListActionTestCase(unittest.TestCase):
     def test_genstring(self):
         """Test the genstring() method for a list of subsidiary Actions
         """
-        def f(target,source,env):
+
+        def f(target, source, env):
             pass
-        def g(target,source,env,for_signature):
+
+        def g(target, source, env, for_signature):
             return 'generated %s %s' % (target[0], source[0])
+
         g = SCons.Action.Action(g, generator=1)
         a = SCons.Action.ListAction([f, g, "XXX", f])
         s = a.genstring(['foo.x'], ['bar.y'], Environment())
@@ -1713,11 +1841,13 @@ class ListActionTestCase(unittest.TestCase):
         """Test executing a list of subsidiary Actions
         """
         self.inc = 0
-        def f(target,source,env):
+
+        def f(target, source, env):
             s = env['s']
             s.inc = s.inc + 1
+
         a = SCons.Action.ListAction([f, f, f])
-        a([], [], Environment(s = self))
+        a([], [], Environment(s=self))
         assert self.inc == 3, self.inc
 
         cmd2 = r'%s %s %s syzygy' % (_python_, act_py, outfile)
@@ -1737,8 +1867,9 @@ class ListActionTestCase(unittest.TestCase):
             def __init__(self, target, source, env):
                 with open(env['out'], 'a') as f:
                     f.write("class2b\n")
+
         act = SCons.Action.ListAction([cmd2, function2, class2a(), class2b])
-        r = act([], [], Environment(out = outfile))
+        r = act([], [], Environment(out=outfile))
         assert isinstance(r.status, class2b), r.status
         c = test.read(outfile, 'r')
         assert c == "act.py: 'syzygy'\nfunction2\nclass2a\nclass2b\n", c
@@ -1746,18 +1877,21 @@ class ListActionTestCase(unittest.TestCase):
     def test_get_contents(self):
         """Test fetching the contents of a list of subsidiary Actions
         """
-        self.foo=0
+        self.foo = 0
+
         def gen(target, source, env, for_signature):
             s = env['s']
-            s.foo=1
+            s.foo = 1
             return "y"
+
         a = SCons.Action.ListAction(["x",
                                      SCons.Action.Action(gen, generator=1),
                                      "z"])
-        c = a.get_contents(target=[], source=[], env=Environment(s = self))
-        assert self.foo==1, self.foo
+        c = a.get_contents(target=[], source=[], env=Environment(s=self))
+        assert self.foo == 1, self.foo
         assert c == b"xyz", c
 
+
 class LazyActionTestCase(unittest.TestCase):
     def test___init__(self):
         """Test creation of a lazy-evaluation Action
@@ -1776,8 +1910,10 @@ class LazyActionTestCase(unittest.TestCase):
     def test_genstring(self):
         """Test the lazy-evaluation Action genstring() method
         """
+
         def f(target, source, env):
             pass
+
         a = SCons.Action.Action('$BAR')
         env1 = Environment(BAR=f, s=self)
         env2 = Environment(BAR='xxx', s=self)
@@ -1789,15 +1925,17 @@ class LazyActionTestCase(unittest.TestCase):
     def test_execute(self):
         """Test executing a lazy-evaluation Action
         """
+
         def f(target, source, env):
             s = env['s']
-            s.test=1
+            s.test = 1
             return 0
+
         a = SCons.Action.Action('$BAR')
-        a([], [], env=Environment(BAR = f, s = self))
+        a([], [], env=Environment(BAR=f, s=self))
         assert self.test == 1, self.test
         cmd = r'%s %s %s lazy' % (_python_, act_py, outfile)
-        a([], [], env=Environment(BAR = cmd, s = self))
+        a([], [], env=Environment(BAR=cmd, s=self))
         c = test.read(outfile, 'r')
         assert c == "act.py: 'lazy'\n", c
 
@@ -1805,7 +1943,7 @@ class LazyActionTestCase(unittest.TestCase):
         """Test fetching the contents of a lazy-evaluation Action
         """
         a = SCons.Action.Action("${FOO}")
-        env = Environment(FOO = [["This", "is", "a", "test"]])
+        env = Environment(FOO=[["This", "is", "a", "test"]])
         c = a.get_contents(target=[], source=[], env=env)
         assert c == b"This is a test", c
 
@@ -1816,11 +1954,11 @@ class LazyActionTestCase(unittest.TestCase):
         def LocalFunc():
             pass
 
-
         func_matches = {
-            (2,7) : bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,5) : bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
-            (3,6) : bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (2, 7): bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 5): bytearray(b'0, 0, 0, 0,(),(),(d\x00\x00S),(),()'),
+            (3, 6): bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
+            (3, 7): bytearray(b'0, 0, 0, 0,(),(),(d\x00S\x00),(),()'),
         }
 
         meth_matches = [
@@ -1831,27 +1969,26 @@ class LazyActionTestCase(unittest.TestCase):
         def factory(act, **kw):
             return SCons.Action.FunctionAction(act, kw)
 
-
         a = SCons.Action.Action("${FOO}")
 
-        env = Environment(FOO = factory(GlobalFunc))
+        env = Environment(FOO=factory(GlobalFunc))
         c = a.get_contents(target=[], source=[], env=env)
         # assert c in func_matches, "Got\n"+repr(c)+"\nExpected one of \n"+"\n".join([repr(f) for f in func_matches])
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(func_matches[sys.version_info[:2]])
-
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            func_matches[sys.version_info[:2]])
 
-
-        env = Environment(FOO = factory(LocalFunc))
+        env = Environment(FOO=factory(LocalFunc))
         c = a.get_contents(target=[], source=[], env=env)
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(func_matches[sys.version_info[:2]])
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            func_matches[sys.version_info[:2]])
 
         # matches_foo = [x + b"foo" for x in func_matches]
         matches_foo = func_matches[sys.version_info[:2]] + b'foo'
 
-
-        env = Environment(FOO = factory(GlobalFunc, varlist=['XYZ']))
+        env = Environment(FOO=factory(GlobalFunc, varlist=['XYZ']))
         c = a.get_contents(target=[], source=[], env=env)
-        assert c == func_matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(func_matches[sys.version_info[:2]])
+        assert c == func_matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            func_matches[sys.version_info[:2]])
 
         env['XYZ'] = 'foo'
         c = a.get_contents(target=[], source=[], env=env)
@@ -1861,36 +1998,39 @@ class LazyActionTestCase(unittest.TestCase):
 class ActionCallerTestCase(unittest.TestCase):
     def test___init__(self):
         """Test creation of an ActionCaller"""
-        ac = SCons.Action.ActionCaller(1, [2, 3], {'FOO' : 4, 'BAR' : 5})
+        ac = SCons.Action.ActionCaller(1, [2, 3], {'FOO': 4, 'BAR': 5})
         assert ac.parent == 1, ac.parent
         assert ac.args == [2, 3], ac.args
-        assert ac.kw == {'FOO' : 4, 'BAR' : 5}, ac.kw
+        assert ac.kw == {'FOO': 4, 'BAR': 5}, ac.kw
 
     def test_get_contents(self):
         """Test fetching the contents of an ActionCaller"""
+
         def strfunc():
             pass
 
         def LocalFunc():
             pass
 
-
         matches = {
-            (2,7) : b'd\x00\x00S',
-            (3,5) : b'd\x00\x00S',
-            (3,6) : b'd\x00S\x00',
-        }
+            (2, 7): b'd\x00\x00S',
+            (3, 5): b'd\x00\x00S',
+            (3, 6): b'd\x00S\x00',
+            (3, 7): b'd\x00S\x00',
 
+        }
 
         af = SCons.Action.ActionFactory(GlobalFunc, strfunc)
         ac = SCons.Action.ActionCaller(af, [], {})
         c = ac.get_contents([], [], Environment())
-        assert c == matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(matches[sys.version_info[:2]])
+        assert c == matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            matches[sys.version_info[:2]])
 
         af = SCons.Action.ActionFactory(LocalFunc, strfunc)
         ac = SCons.Action.ActionCaller(af, [], {})
         c = ac.get_contents([], [], Environment())
-        assert c == matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(matches[sys.version_info[:2]])
+        assert c == matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            matches[sys.version_info[:2]])
 
         class LocalActFunc(object):
             def __call__(self):
@@ -1899,12 +2039,14 @@ class ActionCallerTestCase(unittest.TestCase):
         af = SCons.Action.ActionFactory(GlobalActFunc(), strfunc)
         ac = SCons.Action.ActionCaller(af, [], {})
         c = ac.get_contents([], [], Environment())
-        assert c == matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(matches[sys.version_info[:2]])
+        assert c == matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            matches[sys.version_info[:2]])
 
         af = SCons.Action.ActionFactory(LocalActFunc(), strfunc)
         ac = SCons.Action.ActionCaller(af, [], {})
         c = ac.get_contents([], [], Environment())
-        assert c == matches[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected one of \n"+repr(matches[sys.version_info[:2]])
+        assert c == matches[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected one of \n" + repr(
+            matches[sys.version_info[:2]])
 
         matches = [
             b"<built-in function str>",
@@ -1922,12 +2064,14 @@ class ActionCallerTestCase(unittest.TestCase):
     def test___call__(self):
         """Test calling an ActionCaller"""
         actfunc_args = []
+
         def actfunc(a1, a2, a3, args=actfunc_args):
             args.extend([a1, a2, a3])
+
         def strfunc(a1, a2, a3):
             pass
 
-        e = Environment(FOO = 2, BAR = 5)
+        e = Environment(FOO=2, BAR=5)
 
         af = SCons.Action.ActionFactory(actfunc, strfunc)
         ac = SCons.Action.ActionCaller(af, ['$__env__', '$FOO', 3], {})
@@ -1937,7 +2081,7 @@ class ActionCallerTestCase(unittest.TestCase):
         assert actfunc_args[2] == 3, actfunc_args
         del actfunc_args[:]
 
-        ac = SCons.Action.ActionCaller(af, [], {'a3' : '$__env__', 'a2' : '$BAR', 'a1' : 4})
+        ac = SCons.Action.ActionCaller(af, [], {'a3': '$__env__', 'a2': '$BAR', 'a1': 4})
         ac([], [], e)
         assert actfunc_args[0] == 4, actfunc_args
         assert actfunc_args[1] == '5', actfunc_args
@@ -1947,29 +2091,35 @@ class ActionCallerTestCase(unittest.TestCase):
     def test_strfunction(self):
         """Test calling the ActionCaller strfunction() method"""
         strfunc_args = []
+
         def actfunc(a1, a2, a3, a4):
             pass
+
         def strfunc(a1, a2, a3, a4, args=strfunc_args):
             args.extend([a1, a2, a3, a4])
 
         af = SCons.Action.ActionFactory(actfunc, strfunc)
         ac = SCons.Action.ActionCaller(af, [1, '$FOO', 3, '$WS'], {})
-        ac.strfunction([], [], Environment(FOO = 2, WS='white   space'))
+        ac.strfunction([], [], Environment(FOO=2, WS='white   space'))
         assert strfunc_args == [1, '2', 3, 'white   space'], strfunc_args
 
         del strfunc_args[:]
-        d = {'a3' : 6, 'a2' : '$BAR', 'a1' : 4, 'a4' : '$WS'}
+        d = {'a3': 6, 'a2': '$BAR', 'a1': 4, 'a4': '$WS'}
         ac = SCons.Action.ActionCaller(af, [], d)
-        ac.strfunction([], [], Environment(BAR = 5, WS='w   s'))
+        ac.strfunction([], [], Environment(BAR=5, WS='w   s'))
         assert strfunc_args == [4, '5', 6, 'w   s'], strfunc_args
 
+
 class ActionFactoryTestCase(unittest.TestCase):
     def test___init__(self):
         """Test creation of an ActionFactory"""
+
         def actfunc():
             pass
+
         def strfunc():
             pass
+
         ac = SCons.Action.ActionFactory(actfunc, strfunc)
         assert ac.actfunc is actfunc, ac.actfunc
         assert ac.strfunc is strfunc, ac.strfunc
@@ -1978,10 +2128,13 @@ class ActionFactoryTestCase(unittest.TestCase):
         """Test calling whatever's returned from an ActionFactory"""
         actfunc_args = []
         strfunc_args = []
+
         def actfunc(a1, a2, a3, args=actfunc_args):
             args.extend([a1, a2, a3])
+
         def strfunc(a1, a2, a3, args=strfunc_args):
             args.extend([a1, a2, a3])
+
         af = SCons.Action.ActionFactory(actfunc, strfunc)
         af(3, 6, 9)([], [], Environment())
         assert actfunc_args == [3, 6, 9], actfunc_args
@@ -1995,8 +2148,8 @@ class ActionCompareTestCase(unittest.TestCase):
 
         Basically ensures we can locate the builder, comparing it to
         itself along the way."""
-        bar = SCons.Builder.Builder(action = {})
-        env = Environment( BUILDERS = {'BAR' : bar} )
+        bar = SCons.Builder.Builder(action={})
+        env = Environment(BUILDERS={'BAR': bar})
         name = bar.get_name(env)
         assert name == 'BAR', name
 
@@ -2005,12 +2158,12 @@ class ActionCompareTestCase(unittest.TestCase):
 
         Ensure that we can compare builders (and thereby actions) to
         each other safely."""
-        foo = SCons.Builder.Builder(action = '$FOO', suffix = '.foo')
-        bar = SCons.Builder.Builder(action = {})
+        foo = SCons.Builder.Builder(action='$FOO', suffix='.foo')
+        bar = SCons.Builder.Builder(action={})
         assert foo != bar
         assert foo.action != bar.action
-        env = Environment( BUILDERS = {'FOO' : foo,
-                                       'BAR' : bar} )
+        env = Environment(BUILDERS={'FOO': foo,
+                                    'BAR': bar})
         name = foo.get_name(env)
         assert name == 'FOO', name
         name = bar.get_name(env)
@@ -2024,14 +2177,14 @@ class ActionCompareTestCase(unittest.TestCase):
         where one of the builders has a suffix dictionary with a None
         key."""
 
-        foo = SCons.Builder.Builder(action = '$FOO', suffix = '.foo')
-        bar = SCons.Builder.Builder(action = {}, suffix={None:'.bar'})
+        foo = SCons.Builder.Builder(action='$FOO', suffix='.foo')
+        bar = SCons.Builder.Builder(action={}, suffix={None: '.bar'})
         bar.add_action('.cow', "$MOO")
-        dog = SCons.Builder.Builder(suffix = '.bar')
+        dog = SCons.Builder.Builder(suffix='.bar')
 
-        env = Environment( BUILDERS = {'FOO' : foo,
-                                       'BAR' : bar,
-                                       'DOG' : dog} )
+        env = Environment(BUILDERS={'FOO': foo,
+                                    'BAR': bar,
+                                    'DOG': dog})
 
         assert foo.get_name(env) == 'FOO', foo.get_name(env)
         assert bar.get_name(env) == 'BAR', bar.get_name(env)
@@ -2040,9 +2193,11 @@ class ActionCompareTestCase(unittest.TestCase):
 
 class TestClass(object):
     """A test class used by ObjectContentsTestCase.test_object_contents"""
+
     def __init__(self):
         self.a = "a"
         self.b = "b"
+
     def method(self, arg):
         pass
 
@@ -2058,14 +2213,15 @@ class ObjectContentsTestCase(unittest.TestCase):
 
         # Since the python bytecode has per version differences, we need different expected results per version
         expected = {
-            (2,7) : bytearray(b'3, 3, 0, 0,(),(),(|\x00\x00S),(),()'),
-            (3,5) : bytearray(b'3, 3, 0, 0,(),(),(|\x00\x00S),(),()'),
-            (3,6) : bytearray(b'3, 3, 0, 0,(),(),(|\x00S\x00),(),()'),
+            (2, 7): bytearray(b'3, 3, 0, 0,(),(),(|\x00\x00S),(),()'),
+            (3, 5): bytearray(b'3, 3, 0, 0,(),(),(|\x00\x00S),(),()'),
+            (3, 6): bytearray(b'3, 3, 0, 0,(),(),(|\x00S\x00),(),()'),
+            (3, 7): bytearray(b'3, 3, 0, 0,(),(),(|\x00S\x00),(),()'),
         }
 
         c = SCons.Action._function_contents(func1)
-        assert c == expected[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected \n"+"\n"+repr(expected[sys.version_info[:2]])
-
+        assert c == expected[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected \n" + "\n" + repr(
+            expected[sys.version_info[:2]])
 
     def test_object_contents(self):
         """Test that Action._object_contents works"""
@@ -2078,12 +2234,18 @@ class ObjectContentsTestCase(unittest.TestCase):
 
         # Since the python bytecode has per version differences, we need different expected results per version
         expected = {
-            (2,7): bytearray(b"{TestClass:__main__}[[[(<type \'object\'>, ()), [(<class \'__main__.TestClass\'>, (<type \'object\'>,))]]]]{{1, 1, 0, 0,(a,b),(a,b),(d\x01\x00|\x00\x00_\x00\x00d\x02\x00|\x00\x00_\x01\x00d\x00\x00S),(),(),2, 2, 0, 0,(),(),(d\x00\x00S),(),()}}{{{a=a,b=b}}}"),
-            (3,5): bytearray(b"{TestClass:__main__}[[[(<class \'object\'>, ()), [(<class \'__main__.TestClass\'>, (<class \'object\'>,))]]]]{{1, 1, 0, 0,(a,b),(a,b),(d\x01\x00|\x00\x00_\x00\x00d\x02\x00|\x00\x00_\x01\x00d\x00\x00S),(),(),2, 2, 0, 0,(),(),(d\x00\x00S),(),()}}{{{a=a,b=b}}}"),
-            (3,6): bytearray(b"{TestClass:__main__}[[[(<class \'object\'>, ()), [(<class \'__main__.TestClass\'>, (<class \'object\'>,))]]]]{{1, 1, 0, 0,(a,b),(a,b),(d\x01|\x00_\x00d\x02|\x00_\x01d\x00S\x00),(),(),2, 2, 0, 0,(),(),(d\x00S\x00),(),()}}{{{a=a,b=b}}}"),
+            (2, 7): bytearray(
+                b"{TestClass:__main__}[[[(<type \'object\'>, ()), [(<class \'__main__.TestClass\'>, (<type \'object\'>,))]]]]{{1, 1, 0, 0,(a,b),(a,b),(d\x01\x00|\x00\x00_\x00\x00d\x02\x00|\x00\x00_\x01\x00d\x00\x00S),(),(),2, 2, 0, 0,(),(),(d\x00\x00S),(),()}}{{{a=a,b=b}}}"),
+            (3, 5): bytearray(
+                b"{TestClass:__main__}[[[(<class \'object\'>, ()), [(<class \'__main__.TestClass\'>, (<class \'object\'>,))]]]]{{1, 1, 0, 0,(a,b),(a,b),(d\x01\x00|\x00\x00_\x00\x00d\x02\x00|\x00\x00_\x01\x00d\x00\x00S),(),(),2, 2, 0, 0,(),(),(d\x00\x00S),(),()}}{{{a=a,b=b}}}"),
+            (3, 6): bytearray(
+                b"{TestClass:__main__}[[[(<class \'object\'>, ()), [(<class \'__main__.TestClass\'>, (<class \'object\'>,))]]]]{{1, 1, 0, 0,(a,b),(a,b),(d\x01|\x00_\x00d\x02|\x00_\x01d\x00S\x00),(),(),2, 2, 0, 0,(),(),(d\x00S\x00),(),()}}{{{a=a,b=b}}}"),
+            (3, 7): bytearray(
+                b"{TestClass:__main__}[[[(<class \'object\'>, ()), [(<class \'__main__.TestClass\'>, (<class \'object\'>,))]]]]{{1, 1, 0, 0,(a,b),(a,b),(d\x01|\x00_\x00d\x02|\x00_\x01d\x00S\x00),(),(),2, 2, 0, 0,(),(),(d\x00S\x00),(),()}}{{{a=a,b=b}}}"),
         }
 
-        assert c == expected[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected \n"+"\n"+repr(expected[sys.version_info[:2]])
+        assert c == expected[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected \n" + "\n" + repr(
+            expected[sys.version_info[:2]])
 
     def test_code_contents(self):
         """Test that Action._code_contents works"""
@@ -2093,36 +2255,18 @@ class ObjectContentsTestCase(unittest.TestCase):
 
         # Since the python bytecode has per version differences, we need different expected results per version
         expected = {
-            (2,7) : bytearray(b'0, 0, 0, 0,(N.),(),(d\x00\x00GHd\x01\x00S)'),
-            (3,5) : bytearray(b'0, 0, 0, 0,(N.),(print),(e\x00\x00d\x00\x00\x83\x01\x00\x01d\x01\x00S)'),
-            (3,6) : bytearray(b'0, 0, 0, 0,(N.),(print),(e\x00d\x00\x83\x01\x01\x00d\x01S\x00)'),
+            (2, 7): bytearray(b'0, 0, 0, 0,(Hello, World!),(),(d\x00\x00GHd\x01\x00S)'),
+            (3, 5): bytearray(b'0, 0, 0, 0,(Hello, World!),(print),(e\x00\x00d\x00\x00\x83\x01\x00\x01d\x01\x00S)'),
+            (3, 6): bytearray(b'0, 0, 0, 0,(Hello, World!),(print),(e\x00d\x00\x83\x01\x01\x00d\x01S\x00)'),
+            (3, 7): bytearray(b'0, 0, 0, 0,(Hello, World!),(print),(e\x00d\x00\x83\x01\x01\x00d\x01S\x00)'),
         }
 
-        assert c == expected[sys.version_info[:2]], "Got\n"+repr(c)+"\nExpected \n"+"\n"+expected[sys.version_info[:2]]
-
+        assert c == expected[sys.version_info[:2]], "Got\n" + repr(c) + "\nExpected \n" + "\n" + repr(expected[
+            sys.version_info[:2]])
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [ _ActionActionTestCase,
-                 ActionTestCase,
-                 CommandActionTestCase,
-                 CommandGeneratorActionTestCase,
-                 FunctionActionTestCase,
-                 ListActionTestCase,
-                 LazyActionTestCase,
-                 ActionCallerTestCase,
-                 ActionFactoryTestCase,
-                 ActionCompareTestCase,
-                 ObjectContentsTestCase ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-
-    TestUnit.run(suite)
-
-    # Swap this for above to debug otherwise you can't run individual tests as TestUnit is swallowing arguments
-    # unittest.main()
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Builder.py b/src/engine/SCons/Builder.py
index 9cb0f86..512fcf7 100644
--- a/src/engine/SCons/Builder.py
+++ b/src/engine/SCons/Builder.py
@@ -77,7 +77,7 @@ There are the following methods for internal use within this module:
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -98,7 +98,7 @@ There are the following methods for internal use within this module:
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Builder.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Builder.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import collections
 
@@ -291,7 +291,14 @@ def _node_errors(builder, env, tlist, slist):
         if t.side_effect:
             raise UserError("Multiple ways to build the same target were specified for: %s" % t)
         if t.has_explicit_builder():
-            if not t.env is None and not t.env is env:
+            # Check for errors when the environments are different
+            # No error if environments are the same Environment instance
+            if (not t.env is None and not t.env is env and
+                    # Check OverrideEnvironment case - no error if wrapped Environments
+                    # are the same instance, and overrides lists match
+                    not (getattr(t.env, '__subject', 0) is getattr(env, '__subject', 1) and
+                         getattr(t.env, 'overrides', 0) == getattr(env, 'overrides', 1) and
+                         not builder.multi)):
                 action = t.builder.action
                 t_contents = t.builder.action.get_contents(tlist, slist, t.env)
                 contents = builder.action.get_contents(tlist, slist, env)
@@ -300,7 +307,10 @@ def _node_errors(builder, env, tlist, slist):
                     msg = "Two different environments were specified for target %s,\n\tbut they appear to have the same action: %s" % (t, action.genstring(tlist, slist, t.env))
                     SCons.Warnings.warn(SCons.Warnings.DuplicateEnvironmentWarning, msg)
                 else:
-                    msg = "Two environments with different actions were specified for the same target: %s\n(action 1: %s)\n(action 2: %s)" % (t,t_contents.decode('utf-8'),contents.decode('utf-8'))
+                    try:
+                        msg = "Two environments with different actions were specified for the same target: %s\n(action 1: %s)\n(action 2: %s)" % (t,t_contents.decode('utf-8'),contents.decode('utf-8'))
+                    except UnicodeDecodeError as e:
+                        msg = "Two environments with different actions were specified for the same target: %s"%t
                     raise UserError(msg)
             if builder.multi:
                 if t.builder != builder:
diff --git a/src/engine/SCons/BuilderTests.py b/src/engine/SCons/BuilderTests.py
index edc4ca8..255eced 100644
--- a/src/engine/SCons/BuilderTests.py
+++ b/src/engine/SCons/BuilderTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -22,7 +22,7 @@
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/BuilderTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/BuilderTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -680,7 +680,9 @@ class BuilderTestCase(unittest.TestCase):
     def test_single_source(self):
         """Test Builder with single_source flag set"""
         def func(target, source, env):
-            open(str(target[0]), "w")
+            """create the file"""
+            with open(str(target[0]), "w"):
+                pass
             if (len(source) == 1 and len(target) == 1):
                 env['CNT'][0] = env['CNT'][0] + 1
                 
@@ -736,10 +738,12 @@ class BuilderTestCase(unittest.TestCase):
         """Testing handling lists of targets and source"""
         def function2(target, source, env, tlist = [outfile, outfile2], **kw):
             for t in target:
-                open(str(t), 'w').write("function2\n")
+                with open(str(t), 'w') as f:
+                    f.write("function2\n")
             for t in tlist:
                 if not t in list(map(str, target)):
-                    open(t, 'w').write("function2\n")
+                    with open(t, 'w') as f:
+                        f.write("function2\n")
             return 1
 
         env = Environment()
@@ -765,10 +769,12 @@ class BuilderTestCase(unittest.TestCase):
 
         def function3(target, source, env, tlist = [sub1_out, sub2_out]):
             for t in target:
-                open(str(t), 'w').write("function3\n")
+                with open(str(t), 'w') as f:
+                    f.write("function3\n")
             for t in tlist:
                 if not t in list(map(str, target)):
-                    open(t, 'w').write("function3\n")
+                    with open(t, 'w') as f:
+                        f.write("function3\n")
             return 1
 
         builder = SCons.Builder.Builder(action = function3)
diff --git a/src/engine/SCons/CacheDir.py b/src/engine/SCons/CacheDir.py
index 8815eb3..73df784 100644
--- a/src/engine/SCons/CacheDir.py
+++ b/src/engine/SCons/CacheDir.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,12 +21,13 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/CacheDir.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/CacheDir.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """
 CacheDir support
 """
 
+import hashlib
 import json
 import os
 import stat
@@ -55,6 +56,10 @@ def CacheRetrieveFunc(target, source, env):
             fs.symlink(fs.readlink(cachefile), t.get_internal_path())
         else:
             env.copy_from_cache(cachefile, t.get_internal_path())
+            try:
+                os.utime(cachefile, None)
+            except OSError:
+                pass
         st = fs.stat(cachefile)
         fs.chmod(t.get_internal_path(), stat.S_IMODE(st[stat.ST_MODE]) | stat.S_IWRITE)
     return 0
@@ -134,12 +139,6 @@ warned = dict()
 class CacheDir(object):
 
     def __init__(self, path):
-        try:
-            import hashlib
-        except ImportError:
-            msg = "No hashlib or MD5 module available, CacheDir() not supported"
-            SCons.Warnings.warn(SCons.Warnings.NoMD5ModuleWarning, msg)
-            path = None
         self.path = path
         self.current_cache_debug = None
         self.debugFP = None
@@ -222,7 +221,9 @@ class CacheDir(object):
             return None, None
 
         sig = node.get_cachedir_bsig()
+
         subdir = sig[:self.config['prefix_len']].upper()
+
         dir = os.path.join(self.path, subdir)
         return dir, os.path.join(dir, sig)
 
diff --git a/src/engine/SCons/CacheDirTests.py b/src/engine/SCons/CacheDirTests.py
index e7db18c..6b644d3 100644
--- a/src/engine/SCons/CacheDirTests.py
+++ b/src/engine/SCons/CacheDirTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/CacheDirTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/CacheDirTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import shutil
@@ -29,7 +29,6 @@ import sys
 import unittest
 
 from TestCmd import TestCmd
-import TestUnit
 
 import SCons.CacheDir
 
@@ -287,16 +286,7 @@ class FileTestCase(BaseTestCase):
             SCons.CacheDir.CacheRetrieveSilent = save_CacheRetrieveSilent
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [
-        CacheDirTestCase,
-        FileTestCase,
-    ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
-
+    unittest.main()
 # Local Variables:
 # tab-width:4
 # indent-tabs-mode:nil
diff --git a/src/engine/SCons/Conftest.py b/src/engine/SCons/Conftest.py
index abaf00d..84aa992 100644
--- a/src/engine/SCons/Conftest.py
+++ b/src/engine/SCons/Conftest.py
@@ -136,7 +136,7 @@ def CheckBuilder(context, text = None, language = None):
 
     if not text:
         text = """
-int main() {
+int main(void) {
     return 0;
 }
 """
@@ -157,7 +157,7 @@ def CheckCC(context):
     """
     context.Display("Checking whether the C compiler works... ")
     text = """
-int main()
+int main(void)
 {
     return 0;
 }
@@ -177,7 +177,7 @@ def CheckSHCC(context):
     """
     context.Display("Checking whether the (shared) C compiler works... ")
     text = """
-int foo()
+int foo(void)
 {
     return 0;
 }
@@ -197,7 +197,7 @@ def CheckCXX(context):
     """
     context.Display("Checking whether the C++ compiler works... ")
     text = """
-int main()
+int main(void)
 {
     return 0;
 }
@@ -217,7 +217,7 @@ def CheckSHCXX(context):
     """
     context.Display("Checking whether the (shared) C++ compiler works... ")
     text = """
-int main()
+int main(void)
 {
     return 0;
 }
@@ -290,7 +290,7 @@ char %s();""" % function_name
 #include <assert.h>
 %(hdr)s
 
-int main() {
+int main(void) {
 #if defined (__stub_%(name)s) || defined (__stub___%(name)s)
   fail fail fail
 #else
@@ -400,7 +400,7 @@ def CheckType(context, type_name, fallback = None,
 %(include)s
 %(header)s
 
-int main() {
+int main(void) {
   if ((%(name)s *) 0)
     return 0;
   if (sizeof (%(name)s))
@@ -465,7 +465,7 @@ def CheckTypeSize(context, type_name, header = None, language = None, expect = N
         src = src + r"""
 typedef %s scons_check_type;
 
-int main()
+int main(void)
 {
     static int test_array[1 - 2 * !(((long int) (sizeof(scons_check_type))) == %d)];
     test_array[0] = 0;
@@ -498,7 +498,7 @@ int main()
         src = src + """
 #include <stdlib.h>
 #include <stdio.h>
-int main() {
+int main(void) {
     printf("%d", (int)sizeof(""" + type_name + """));
     return 0;
 }
@@ -560,7 +560,7 @@ def CheckDeclaration(context, symbol, includes = None, language = None):
     context.Display('Checking whether %s is declared... ' % symbol)
 
     src = src + r"""
-int main()
+int main(void)
 {
 #ifndef %s
     (void) %s;
diff --git a/src/engine/SCons/Debug.py b/src/engine/SCons/Debug.py
index d1ee991..34ce70d 100644
--- a/src/engine/SCons/Debug.py
+++ b/src/engine/SCons/Debug.py
@@ -9,7 +9,7 @@ caller_trace()
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ caller_trace()
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Debug.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Debug.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import sys
diff --git a/src/engine/SCons/Defaults.py b/src/engine/SCons/Defaults.py
index 4a18045..c2dc70a 100644
--- a/src/engine/SCons/Defaults.py
+++ b/src/engine/SCons/Defaults.py
@@ -10,7 +10,7 @@ from distutils.msvccompiler.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ from distutils.msvccompiler.
 #
 from __future__ import division
 
-__revision__ = "src/engine/SCons/Defaults.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Defaults.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 import os
@@ -210,7 +210,7 @@ def chmod_func(dest, mode):
             else:
                 raise SyntaxError("Could not find +, - or =")
             operation_list = operation.split(operator)
-            if len(operation_list) is not 2:
+            if len(operation_list) != 2:
                 raise SyntaxError("More than one operator found")
             user = operation_list[0].strip().replace("a", "ugo")
             permission = operation_list[1].strip()
@@ -333,8 +333,8 @@ def touch_func(dest):
         if os.path.exists(file):
             atime = os.path.getatime(file)
         else:
-            open(file, 'w')
-            atime = mtime
+            with open(file, 'w'):
+                atime = mtime
         os.utime(file, (atime, mtime))
 
 Touch = ActionFactory(touch_func,
@@ -342,6 +342,7 @@ Touch = ActionFactory(touch_func,
 
 # Internal utility functions
 
+
 def _concat(prefix, list, suffix, env, f=lambda x: x, target=None, source=None):
     """
     Creates a new list from 'list' by first interpolating each element
@@ -358,6 +359,7 @@ def _concat(prefix, list, suffix, env, f=lambda x: x, target=None, source=None):
 
     return _concat_ixes(prefix, list, suffix, env)
 
+
 def _concat_ixes(prefix, list, suffix, env):
     """
     Creates a new list from 'list' by concatenating the 'prefix' and
@@ -395,6 +397,7 @@ def _concat_ixes(prefix, list, suffix, env):
 
     return result
 
+
 def _stripixes(prefix, itms, suffix, stripprefixes, stripsuffixes, env, c=None):
     """
     This is a wrapper around _concat()/_concat_ixes() that checks for
@@ -565,7 +568,6 @@ ConstructionEnvironment = {
     'DSUFFIXES'     : SCons.Tool.DSuffixes,
     'ENV'           : {},
     'IDLSUFFIXES'   : SCons.Tool.IDLSuffixes,
-#    'LATEXSUFFIXES' : SCons.Tool.LaTeXSuffixes, # moved to the TeX tools generate functions
     '_concat'       : _concat,
     '_defines'      : _defines,
     '_stripixes'    : _stripixes,
diff --git a/src/engine/SCons/Defaults.xml b/src/engine/SCons/Defaults.xml
index cef1e93..e568c92 100644
--- a/src/engine/SCons/Defaults.xml
+++ b/src/engine/SCons/Defaults.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -76,7 +76,8 @@ An automatically-generated construction variable
 containing the C preprocessor command-line options
 to define values.
 The value of &cv-_CPPDEFFLAGS; is created
-by appending &cv-CPPDEFPREFIX; and &cv-CPPDEFSUFFIX;
+by respectively prepending and appending
+&cv-CPPDEFPREFIX; and &cv-CPPDEFSUFFIX;
 to the beginning and end
 of each definition in &cv-CPPDEFINES;.
 </para>
@@ -99,7 +100,8 @@ If &cv-CPPDEFINES; is a string,
 the values of the
 &cv-CPPDEFPREFIX; and &cv-CPPDEFSUFFIX;
 construction variables
-will be added to the beginning and end.
+will be respectively prepended and appended to the beginning and end
+of each definition in &cv-CPPDEFINES;.
 </para>
 
 <example_commands>
@@ -113,7 +115,7 @@ If &cv-CPPDEFINES; is a list,
 the values of the
 &cv-CPPDEFPREFIX; and &cv-CPPDEFSUFFIX;
 construction variables
-will be appended to the beginning and end
+will be respectively prepended and appended to the beginning and end
 of each element in the list.
 If any element is a list or tuple,
 then the first item is the name being
@@ -131,7 +133,7 @@ If &cv-CPPDEFINES; is a dictionary,
 the values of the
 &cv-CPPDEFPREFIX; and &cv-CPPDEFSUFFIX;
 construction variables
-will be appended to the beginning and end
+will be respectively prepended and appended to the beginning and end
 of each item from the dictionary.
 The key of each dictionary item
 is a name being defined
@@ -159,7 +161,7 @@ env = Environment(CPPDEFINES={'B':2, 'A':None})
 <para>
 The prefix used to specify preprocessor definitions
 on the C compiler command line.
-This will be appended to the beginning of each definition
+This will be prepended to the beginning of each definition
 in the &cv-CPPDEFINES; construction variable
 when the &cv-_CPPDEFFLAGS; variable is automatically generated.
 </para>
@@ -185,7 +187,7 @@ An automatically-generated construction variable
 containing the C preprocessor command-line options
 for specifying directories to be searched for include files.
 The value of &cv-_CPPINCFLAGS; is created
-by appending &cv-INCPREFIX; and &cv-INCSUFFIX;
+by respectively prepending and appending &cv-INCPREFIX; and &cv-INCSUFFIX;
 to the beginning and end
 of each directory in &cv-CPPPATH;.
 </para>
@@ -227,7 +229,7 @@ through the automatically-generated
 &cv-_CPPINCFLAGS;
 construction variable,
 which is constructed by
-appending the values of the
+respectively prepending and appending the value of the
 &cv-INCPREFIX; and &cv-INCSUFFIX;
 construction variables
 to the beginning and end
@@ -304,7 +306,7 @@ The default list is:
 <para>
 The prefix used to specify an include directory on the C compiler command
 line.
-This will be appended to the beginning of each directory
+This will be prepended to the beginning of each directory
 in the &cv-CPPPATH; and &cv-FORTRANPATH; construction variables
 when the &cv-_CPPINCFLAGS; and &cv-_FORTRANINCFLAGS;
 variables are automatically generated.
@@ -388,7 +390,7 @@ An automatically-generated construction variable
 containing the linker command-line options
 for specifying directories to be searched for library.
 The value of &cv-_LIBDIRFLAGS; is created
-by appending &cv-LIBDIRPREFIX; and &cv-LIBDIRSUFFIX;
+by respectively prepending and appending &cv-LIBDIRPREFIX; and &cv-LIBDIRSUFFIX;
 to the beginning and end
 of each directory in &cv-LIBPATH;.
 </para>
@@ -399,7 +401,7 @@ of each directory in &cv-LIBPATH;.
 <summary>
 <para>
 The prefix used to specify a library directory on the linker command line.
-This will be appended to the beginning of each directory
+This will be prepended to the beginning of each directory
 in the &cv-LIBPATH; construction variable
 when the &cv-_LIBDIRFLAGS; variable is automatically generated.
 </para>
@@ -424,7 +426,7 @@ An automatically-generated construction variable
 containing the linker command-line options
 for specifying libraries to be linked with the resulting target.
 The value of &cv-_LIBFLAGS; is created
-by appending &cv-LIBLINKPREFIX; and &cv-LIBLINKSUFFIX;
+by respectively prepending and appending &cv-LIBLINKPREFIX; and &cv-LIBLINKSUFFIX;
 to the beginning and end
 of each filename in &cv-LIBS;.
 </para>
@@ -435,7 +437,7 @@ of each filename in &cv-LIBS;.
 <summary>
 <para>
 The prefix used to specify a library to link on the linker command line.
-This will be appended to the beginning of each library
+This will be prepended to the beginning of each library
 in the &cv-LIBS; construction variable
 when the &cv-_LIBFLAGS; variable is automatically generated.
 </para>
@@ -489,7 +491,7 @@ through the automatically-generated
 &cv-_LIBDIRFLAGS;
 construction variable,
 which is constructed by
-appending the values of the
+respectively prepending and appending the values of the
 &cv-LIBDIRPREFIX; and &cv-LIBDIRSUFFIX;
 construction variables
 to the beginning and end
@@ -520,7 +522,7 @@ through the automatically-generated
 &cv-_LIBFLAGS;
 construction variable,
 which is constructed by
-appending the values of the
+respectively prepending and appending the values of the
 &cv-LIBLINKPREFIX; and &cv-LIBLINKSUFFIX;
 construction variables
 to the beginning and end
diff --git a/src/engine/SCons/DefaultsTests.py b/src/engine/SCons/DefaultsTests.py
index fc9934b..5a4e1cb 100644
--- a/src/engine/SCons/DefaultsTests.py
+++ b/src/engine/SCons/DefaultsTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/DefaultsTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/DefaultsTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -32,7 +32,6 @@ import unittest
 from collections import UserDict
 
 import TestCmd
-import TestUnit
 
 import SCons.Errors
 
@@ -77,13 +76,7 @@ class DefaultsTestCase(unittest.TestCase):
         
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [ DefaultsTestCase,
-               ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Environment.py b/src/engine/SCons/Environment.py
index 64210aa..759ff16 100644
--- a/src/engine/SCons/Environment.py
+++ b/src/engine/SCons/Environment.py
@@ -10,7 +10,7 @@ Environment
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ Environment
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Environment.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Environment.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 import copy
@@ -150,7 +150,7 @@ def _set_BUILDERS(env, key, value):
         for k in list(bd.keys()):
             del bd[k]
     except KeyError:
-        bd = BuilderDict(kwbd, env)
+        bd = BuilderDict(bd, env)
         env._dict[key] = bd
     for k, v in value.items():
         if not SCons.Builder.is_a_Builder(v):
@@ -1217,7 +1217,7 @@ class Base(SubstitutionEnvironment):
         return path
 
     def AppendENVPath(self, name, newpath, envname = 'ENV',
-                      sep = os.pathsep, delete_existing=1):
+                      sep = os.pathsep, delete_existing=0):
         """Append path elements to the path 'name' in the 'ENV'
         dictionary for this environment.  Will only add any particular
         path once, and will normpath and normcase all paths to help
@@ -1568,12 +1568,12 @@ class Base(SubstitutionEnvironment):
         """
         filename = self.subst(filename)
         try:
-            fp = open(filename, 'r')
+            with open(filename, 'r') as fp:
+                lines = SCons.Util.LogicalLines(fp).readlines()
         except IOError:
             if must_exist:
                 raise
             return
-        lines = SCons.Util.LogicalLines(fp).readlines()
         lines = [l for l in lines if l[0] != '#']
         tdlist = []
         for line in lines:
@@ -2258,7 +2258,7 @@ class Base(SubstitutionEnvironment):
             while (node != node.srcnode()):
               node = node.srcnode()
             return node
-        sources = list(map( final_source, sources ));
+        sources = list(map(final_source, sources))
         # remove duplicates
         return list(set(sources))
 
@@ -2372,6 +2372,7 @@ class OverrideEnvironment(Base):
         kw = copy_non_reserved_keywords(kw)
         self.__dict__['overrides'].update(semi_deepcopy(kw))
 
+
 # The entry point that will be used by the external world
 # to refer to a construction environment.  This allows the wrapper
 # interface to extend a construction environment for its own purposes
diff --git a/src/engine/SCons/Environment.xml b/src/engine/SCons/Environment.xml
index 0127bc2..71b11e6 100644
--- a/src/engine/SCons/Environment.xml
+++ b/src/engine/SCons/Environment.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -60,7 +60,7 @@ or this:
 
 <example_commands>
 env = Environment()
-env['BUILDERS]['NewBuilder'] = foo
+env['BUILDERS']['NewBuilder'] = foo
 </example_commands>
 </summary>
 </cvar>
diff --git a/src/engine/SCons/EnvironmentTests.py b/src/engine/SCons/EnvironmentTests.py
index 70eda9e..b97ac5c 100644
--- a/src/engine/SCons/EnvironmentTests.py
+++ b/src/engine/SCons/EnvironmentTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,7 +23,7 @@
 
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/EnvironmentTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/EnvironmentTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -139,10 +139,6 @@ class CLVar(UL):
         return UL.__add__(self, CLVar(other))
     def __radd__(self, other):
         return UL.__radd__(self, CLVar(other))
-    def __coerce__(self, other):
-        return (self, CLVar(other))
-
-
 
 class DummyNode(object):
     def __init__(self, name):
@@ -967,7 +963,7 @@ class BaseTestCase(unittest.TestCase,TestEnvironmentFixture):
 
         self.assertRaises(AttributeError, getattr, bw, 'foobar')
         bw.foobar = 42
-        assert bw.foobar is 42
+        assert bw.foobar == 42
 
     # This unit test is currently disabled because we don't think the
     # underlying method it tests (Environment.BuilderWrapper.execute())
@@ -1627,9 +1623,9 @@ def exists(env):
         env1.AppendENVPath('PATH',r'C:\dir\num\two', sep = ';')
         env1.AppendENVPath('PATH',r'C:\dir\num\three', sep = ';')
         env1.AppendENVPath('MYPATH',r'C:\mydir\num\three','MYENV', sep = ';')
-        env1.AppendENVPath('MYPATH',r'C:\mydir\num\one','MYENV', sep = ';')
+        env1.AppendENVPath('MYPATH',r'C:\mydir\num\one','MYENV', sep = ';', delete_existing=1)
         # this should do nothing since delete_existing is 0
-        env1.AppendENVPath('MYPATH',r'C:\mydir\num\three','MYENV', sep = ';', delete_existing=0)
+        env1.AppendENVPath('MYPATH',r'C:\mydir\num\three','MYENV', sep = ';')
         assert(env1['ENV']['PATH'] == r'C:\dir\num\one;C:\dir\num\two;C:\dir\num\three')
         assert(env1['MYENV']['MYPATH'] == r'C:\mydir\num\two;C:\mydir\num\three;C:\mydir\num\one')
 
@@ -1781,15 +1777,15 @@ def exists(env):
         env2 = env1.Clone()
         env3 = env1.Clone(tools=[bar, baz])
 
-        assert env1.get('FOO') is 1
+        assert env1.get('FOO') == 1
         assert env1.get('BAR') is None
         assert env1.get('BAZ') is None
-        assert env2.get('FOO') is 1
+        assert env2.get('FOO') == 1
         assert env2.get('BAR') is None
         assert env2.get('BAZ') is None
-        assert env3.get('FOO') is 1
-        assert env3.get('BAR') is 2
-        assert env3.get('BAZ') is 3
+        assert env3.get('FOO') == 1
+        assert env3.get('BAR') == 2
+        assert env3.get('BAZ') == 3
 
         # Ensure that recursive variable substitution when copying
         # environments works properly.
diff --git a/src/engine/SCons/EnvironmentValues.py b/src/engine/SCons/EnvironmentValues.py
index e2efccb..d94bf3a 100644
--- a/src/engine/SCons/EnvironmentValues.py
+++ b/src/engine/SCons/EnvironmentValues.py
@@ -84,6 +84,7 @@ class EnvironmentValue(object):
         """
         parts = []
         for c in self.value:
+            pass
 
 
 
diff --git a/src/engine/SCons/Errors.py b/src/engine/SCons/Errors.py
index 8388a0f..58ef92e 100644
--- a/src/engine/SCons/Errors.py
+++ b/src/engine/SCons/Errors.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -28,7 +28,7 @@ and user errors in SCons.
 
 """
 
-__revision__ = "src/engine/SCons/Errors.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Errors.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import shutil
 import SCons.Util
@@ -95,7 +95,7 @@ class BuildError(Exception):
 
         # py3: errstr should be string and not bytes.
 
-        self.errstr = SCons.Util.to_str(errstr)
+        self.errstr = SCons.Util.to_String(errstr)
         self.status = status
         self.exitstatus = exitstatus
         self.filename = filename
@@ -176,8 +176,8 @@ def convert_to_BuildError(status, exc_info=None):
             filename = status.filename
         except AttributeError:
             filename = None
-        
-        buildError = BuildError( 
+
+        buildError = BuildError(
             errstr=status.args[0],
             status=status.errno,
             exitstatus=2,
@@ -190,14 +190,13 @@ def convert_to_BuildError(status, exc_info=None):
         # error, which might be different from the target being built
         # (for example, failure to create the directory in which the
         # target file will appear).
-        try:
-            filename = status.filename
-        except AttributeError:
-            filename = None
+        filename = getattr(status, 'filename', None)
+        strerror = getattr(status, 'strerror', str(status))
+        errno = getattr(status, 'errno', 2)
 
-        buildError = BuildError( 
-            errstr=status.strerror,
-            status=status.errno,
+        buildError = BuildError(
+            errstr=strerror,
+            status=errno,
             exitstatus=2,
             filename=filename,
             exc_info=exc_info)
@@ -217,7 +216,7 @@ def convert_to_BuildError(status, exc_info=None):
             errstr="Error %s" % status,
             status=status,
             exitstatus=2)
-    
+
     #import sys
     #sys.stderr.write("convert_to_BuildError: status %s => (errstr %s, status %s)\n"%(status,buildError.errstr, buildError.status))
     return buildError
diff --git a/src/engine/SCons/ErrorsTests.py b/src/engine/SCons/ErrorsTests.py
index 6ad44e3..088224d 100644
--- a/src/engine/SCons/ErrorsTests.py
+++ b/src/engine/SCons/ErrorsTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,13 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/ErrorsTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/ErrorsTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
+import errno
+import os
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 
 
@@ -100,9 +100,31 @@ class ErrorsTestCase(unittest.TestCase):
         except SCons.Errors.ExplicitExit as e:
             assert e.node == "node"
 
+    def test_convert_EnvironmentError_to_BuildError(self):
+        """Test the convert_to_BuildError function on EnvironmentError
+        exceptions.
+        """
+        ee = SCons.Errors.EnvironmentError("test env error")
+        be = SCons.Errors.convert_to_BuildError(ee)
+        assert be.errstr == "test env error"
+        assert be.status == 2
+        assert be.exitstatus == 2
+        assert be.filename is None
+
+    def test_convert_OSError_to_BuildError(self):
+        """Test the convert_to_BuildError function on OSError
+        exceptions.
+        """
+        ose = OSError(7, 'test oserror')
+        be = SCons.Errors.convert_to_BuildError(ose)
+        assert be.errstr == 'test oserror'
+        assert be.status == 7
+        assert be.exitstatus == 2
+        assert be.filename is None
+
+
 if __name__ == "__main__":
-    suite = unittest.makeSuite(ErrorsTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Executor.py b/src/engine/SCons/Executor.py
index 9fabf70..10fc73f 100644
--- a/src/engine/SCons/Executor.py
+++ b/src/engine/SCons/Executor.py
@@ -6,7 +6,7 @@ Nodes.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -28,7 +28,7 @@ Nodes.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Executor.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Executor.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import collections
 
@@ -450,6 +450,8 @@ class Executor(object, with_metaclass(NoSlotsPyPy)):
         """Fetch the signature contents.  This is the main reason this
         class exists, so we can compute this once and cache it regardless
         of how many target or source Nodes there are.
+
+        Returns bytes
         """
         try:
             return self._memo['get_contents']
diff --git a/src/engine/SCons/ExecutorTests.py b/src/engine/SCons/ExecutorTests.py
index 519dff0..03b8480 100644
--- a/src/engine/SCons/ExecutorTests.py
+++ b/src/engine/SCons/ExecutorTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/ExecutorTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/ExecutorTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Executor
 
 
@@ -483,12 +481,7 @@ class ExecutorTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [ ExecutorTestCase ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Job.py b/src/engine/SCons/Job.py
index 7f3544f..45bca62 100644
--- a/src/engine/SCons/Job.py
+++ b/src/engine/SCons/Job.py
@@ -7,7 +7,7 @@ stop, and wait on jobs.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -29,7 +29,7 @@ stop, and wait on jobs.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Job.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Job.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -199,7 +199,7 @@ class Serial(object):
                 task.prepare()
                 if task.needs_execute():
                     task.execute()
-            except:
+            except Exception as e:
                 if self.interrupted():
                     try:
                         raise SCons.Errors.BuildError(
diff --git a/src/engine/SCons/JobTests.py b/src/engine/SCons/JobTests.py
index cc17c1b..7db99e7 100644
--- a/src/engine/SCons/JobTests.py
+++ b/src/engine/SCons/JobTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,24 +20,47 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/JobTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/JobTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import unittest
 import random
 import math
 import sys
 import time
+import os
 
 import TestUnit
 
 import SCons.Job
 
 
+def get_cpu_nums():
+    # Linux, Unix and MacOS:
+    if hasattr( os, "sysconf" ):
+        if "SC_NPROCESSORS_ONLN" in os.sysconf_names:
+            # Linux & Unix:
+            ncpus = os.sysconf( "SC_NPROCESSORS_ONLN" )
+        if isinstance(ncpus, int) and ncpus > 0:
+            return ncpus
+        else: # OSX:
+            return int( os.popen2( "sysctl -n hw.ncpu")[1].read() )
+    # Windows:
+    if "NUMBER_OF_PROCESSORS" in os.environ:
+        ncpus = int( os.environ[ "NUMBER_OF_PROCESSORS" ] );
+    if ncpus > 0:
+        return ncpus
+    return 1 # Default
+
 # a large number
-num_sines = 10000
+num_sines = 500
 
 # how many parallel jobs to perform for the test
-num_jobs = 11
+num_jobs = get_cpu_nums()*2
+
+# in case we werent able to detect num cpus for this test
+# just make a hardcoded suffcient large number, though not future proof
+if(num_jobs == 2):
+    num_jobs = 33
 
 # how many tasks to perform for the test
 num_tasks = num_jobs*5
@@ -75,14 +98,24 @@ class Task(object):
         return True
 
     def execute(self):
-        self.taskmaster.test_case.failUnless(self.was_prepared,
+        self.taskmaster.test_case.assertTrue(self.was_prepared,
                                   "the task wasn't prepared")
 
         self.taskmaster.guard.acquire()
         self.taskmaster.begin_list.append(self.i)
         self.taskmaster.guard.release()
 
+        # while task is executing, represent this in the parallel_list
+        # and then turn it off
+        self.taskmaster.parallel_list[self.i] = 1
         self._do_something()
+        self.taskmaster.parallel_list[self.i] = 0
+
+        # check if task was executing while another was also executing
+        for j in range(1, self.taskmaster.num_tasks):
+            if(self.taskmaster.parallel_list[j+1] == 1):
+                self.taskmaster.found_parallel = True
+                break
 
         self.was_executed = 1
 
@@ -93,26 +126,29 @@ class Task(object):
     def executed(self):
         self.taskmaster.num_executed = self.taskmaster.num_executed + 1
 
-        self.taskmaster.test_case.failUnless(self.was_prepared,
+        self.taskmaster.test_case.assertTrue(self.was_prepared,
                                   "the task wasn't prepared")
-        self.taskmaster.test_case.failUnless(self.was_executed,
+        self.taskmaster.test_case.assertTrue(self.was_executed,
                                   "the task wasn't really executed")
-        self.taskmaster.test_case.failUnless(isinstance(self, Task),
+        self.taskmaster.test_case.assertTrue(isinstance(self, Task),
                                   "the task wasn't really a Task instance")
 
     def failed(self):
         self.taskmaster.num_failed = self.taskmaster.num_failed + 1
         self.taskmaster.stop = 1
-        self.taskmaster.test_case.failUnless(self.was_prepared,
+        self.taskmaster.test_case.assertTrue(self.was_prepared,
                                   "the task wasn't prepared")
 
     def postprocess(self):
         self.taskmaster.num_postprocessed = self.taskmaster.num_postprocessed + 1
 
+    def exception_set(self):
+        pass
+
 class RandomTask(Task):
     def _do_something(self):
         # do something that will take some random amount of time:
-        for i in range(random.randrange(0, num_sines, 1)):
+        for i in range(random.randrange(0, 100 + num_sines, 1)):
             x = math.sin(i)
         time.sleep(0.01)
 
@@ -135,17 +171,17 @@ class ExceptionTask(object):
     def executed(self):
         self.taskmaster.num_executed = self.taskmaster.num_executed + 1
 
-        self.taskmaster.test_case.failUnless(self.was_prepared,
+        self.taskmaster.test_case.assertTrue(self.was_prepared,
                                   "the task wasn't prepared")
-        self.taskmaster.test_case.failUnless(self.was_executed,
+        self.taskmaster.test_case.assertTrue(self.was_executed,
                                   "the task wasn't really executed")
-        self.taskmaster.test_case.failUnless(self.__class__ is Task,
+        self.taskmaster.test_case.assertTrue(self.__class__ is Task,
                                   "the task wasn't really a Task instance")
 
     def failed(self):
         self.taskmaster.num_failed = self.taskmaster.num_failed + 1
         self.taskmaster.stop = 1
-        self.taskmaster.test_case.failUnless(self.was_prepared,
+        self.taskmaster.test_case.assertTrue(self.was_prepared,
                                   "the task wasn't prepared")
 
     def postprocess(self):
@@ -167,7 +203,10 @@ class Taskmaster(object):
         self.num_executed = 0
         self.num_failed = 0
         self.num_postprocessed = 0
+        self.parallel_list = [0] * (n+1)
+        self.found_parallel = False
         self.Task = Task
+        
         # 'guard' guards 'task_begin_list' and 'task_end_list'
         try:
             import threading
@@ -199,12 +238,7 @@ class Taskmaster(object):
 
     def tasks_were_serial(self):
         "analyze the task order to see if they were serial"
-        serial = 1 # assume the tasks were serial
-        for i in range(num_tasks):
-            serial = serial and (self.begin_list[i]
-                                 == self.end_list[i]
-                                 == (i + 1))
-        return serial
+        return not self.found_parallel
 
     def exception_set(self):
         pass
@@ -228,15 +262,15 @@ class ParallelTestCase(unittest.TestCase):
         jobs = SCons.Job.Jobs(num_jobs, taskmaster)
         jobs.run()
 
-        self.failUnless(not taskmaster.tasks_were_serial(),
+        self.assertTrue(not taskmaster.tasks_were_serial(),
                         "the tasks were not executed in parallel")
-        self.failUnless(taskmaster.all_tasks_are_executed(),
+        self.assertTrue(taskmaster.all_tasks_are_executed(),
                         "all the tests were not executed")
-        self.failUnless(taskmaster.all_tasks_are_iterated(),
+        self.assertTrue(taskmaster.all_tasks_are_iterated(),
                         "all the tests were not iterated over")
-        self.failUnless(taskmaster.all_tasks_are_postprocessed(),
+        self.assertTrue(taskmaster.all_tasks_are_postprocessed(),
                         "all the tests were not postprocessed")
-        self.failIf(taskmaster.num_failed,
+        self.assertFalse(taskmaster.num_failed,
                     "some task(s) failed to execute")
 
         # Verify that parallel jobs will pull all of the completed tasks
@@ -248,7 +282,7 @@ class ParallelTestCase(unittest.TestCase):
 
         class SleepTask(Task):
             def _do_something(self):
-                time.sleep(0.1)
+                time.sleep(0.01)
 
         global SaveThreadPool
         SaveThreadPool = SCons.Job.ThreadPool
@@ -258,7 +292,7 @@ class ParallelTestCase(unittest.TestCase):
                 ThreadPoolCallList.append('put(%s)' % task.i)
                 return SaveThreadPool.put(self, task)
             def get(self):
-                time.sleep(0.5)
+                time.sleep(0.05)
                 result = SaveThreadPool.get(self)
                 ThreadPoolCallList.append('get(%s)' % result[0].i)
                 return result
@@ -291,15 +325,15 @@ class SerialTestCase(unittest.TestCase):
         jobs = SCons.Job.Jobs(1, taskmaster)
         jobs.run()
 
-        self.failUnless(taskmaster.tasks_were_serial(),
+        self.assertTrue(taskmaster.tasks_were_serial(),
                         "the tasks were not executed in series")
-        self.failUnless(taskmaster.all_tasks_are_executed(),
+        self.assertTrue(taskmaster.all_tasks_are_executed(),
                         "all the tests were not executed")
-        self.failUnless(taskmaster.all_tasks_are_iterated(),
+        self.assertTrue(taskmaster.all_tasks_are_iterated(),
                         "all the tests were not iterated over")
-        self.failUnless(taskmaster.all_tasks_are_postprocessed(),
+        self.assertTrue(taskmaster.all_tasks_are_postprocessed(),
                         "all the tests were not postprocessed")
-        self.failIf(taskmaster.num_failed,
+        self.assertFalse(taskmaster.num_failed,
                     "some task(s) failed to execute")
 
 class NoParallelTestCase(unittest.TestCase):
@@ -312,18 +346,18 @@ class NoParallelTestCase(unittest.TestCase):
         try:
             taskmaster = Taskmaster(num_tasks, self, RandomTask)
             jobs = SCons.Job.Jobs(2, taskmaster)
-            self.failUnless(jobs.num_jobs == 1,
+            self.assertTrue(jobs.num_jobs == 1,
                             "unexpected number of jobs %d" % jobs.num_jobs)
             jobs.run()
-            self.failUnless(taskmaster.tasks_were_serial(),
+            self.assertTrue(taskmaster.tasks_were_serial(),
                             "the tasks were not executed in series")
-            self.failUnless(taskmaster.all_tasks_are_executed(),
+            self.assertTrue(taskmaster.all_tasks_are_executed(),
                             "all the tests were not executed")
-            self.failUnless(taskmaster.all_tasks_are_iterated(),
+            self.assertTrue(taskmaster.all_tasks_are_iterated(),
                             "all the tests were not iterated over")
-            self.failUnless(taskmaster.all_tasks_are_postprocessed(),
+            self.assertTrue(taskmaster.all_tasks_are_postprocessed(),
                             "all the tests were not postprocessed")
-            self.failIf(taskmaster.num_failed,
+            self.assertFalse(taskmaster.num_failed,
                         "some task(s) failed to execute")
         finally:
             SCons.Job.Parallel = save_Parallel
@@ -337,13 +371,13 @@ class SerialExceptionTestCase(unittest.TestCase):
         jobs = SCons.Job.Jobs(1, taskmaster)
         jobs.run()
 
-        self.failIf(taskmaster.num_executed,
+        self.assertFalse(taskmaster.num_executed,
                     "a task was executed")
-        self.failUnless(taskmaster.num_iterated == 1,
+        self.assertTrue(taskmaster.num_iterated == 1,
                     "exactly one task should have been iterated")
-        self.failUnless(taskmaster.num_failed == 1,
+        self.assertTrue(taskmaster.num_failed == 1,
                     "exactly one task should have failed")
-        self.failUnless(taskmaster.num_postprocessed == 1,
+        self.assertTrue(taskmaster.num_postprocessed == 1,
                     "exactly one task should have been postprocessed")
 
 class ParallelExceptionTestCase(unittest.TestCase):
@@ -354,13 +388,13 @@ class ParallelExceptionTestCase(unittest.TestCase):
         jobs = SCons.Job.Jobs(num_jobs, taskmaster)
         jobs.run()
 
-        self.failIf(taskmaster.num_executed,
+        self.assertFalse(taskmaster.num_executed,
                     "a task was executed")
-        self.failUnless(taskmaster.num_iterated >= 1,
+        self.assertTrue(taskmaster.num_iterated >= 1,
                     "one or more task should have been iterated")
-        self.failUnless(taskmaster.num_failed >= 1,
+        self.assertTrue(taskmaster.num_failed >= 1,
                     "one or more tasks should have failed")
-        self.failUnless(taskmaster.num_postprocessed >= 1,
+        self.assertTrue(taskmaster.num_postprocessed >= 1,
                     "one or more tasks should have been postprocessed")
 
 #---------------------------------------------------------------------
@@ -491,10 +525,10 @@ class _SConsTaskTest(unittest.TestCase):
 
         for N in testnodes:
             state = N.get_state()
-            self.failUnless(state in [SCons.Node.no_state, N.expect_to_be],
+            self.assertTrue(state in [SCons.Node.no_state, N.expect_to_be],
                             "Node %s got unexpected result: %s" % (N, state))
 
-        self.failUnless([N for N in testnodes if N.get_state()],
+        self.assertTrue([N for N in testnodes if N.get_state()],
                         "no nodes ran at all.")
 
 
diff --git a/src/engine/SCons/Memoize.py b/src/engine/SCons/Memoize.py
index 5fe481d..85670c1 100644
--- a/src/engine/SCons/Memoize.py
+++ b/src/engine/SCons/Memoize.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -22,7 +22,7 @@
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Memoize.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Memoize.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """Memoizer
 
diff --git a/src/engine/SCons/MemoizeTests.py b/src/engine/SCons/MemoizeTests.py
index 559232f..790791f 100644
--- a/src/engine/SCons/MemoizeTests.py
+++ b/src/engine/SCons/MemoizeTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/MemoizeTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/MemoizeTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Memoize
 
 # Enable memoization counting
@@ -165,15 +163,7 @@ class CountValueTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [
-        CountDictTestCase,
-        CountValueTestCase,
-    ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Node/Alias.py b/src/engine/SCons/Node/Alias.py
index 567f663..9ea2fe0 100644
--- a/src/engine/SCons/Node/Alias.py
+++ b/src/engine/SCons/Node/Alias.py
@@ -8,7 +8,7 @@ This creates a hash of global Aliases (dummy targets).
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ This creates a hash of global Aliases (dummy targets).
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Node/Alias.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/Alias.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import collections
 
diff --git a/src/engine/SCons/Node/AliasTests.py b/src/engine/SCons/Node/AliasTests.py
index e1929f6..21829b6 100644
--- a/src/engine/SCons/Node/AliasTests.py
+++ b/src/engine/SCons/Node/AliasTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Node/AliasTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/AliasTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Node.Alias
 
@@ -113,16 +111,7 @@ class AliasBuildInfoTestCase(unittest.TestCase):
         bi = SCons.Node.Alias.AliasBuildInfo()
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [
-        AliasTestCase,
-        AliasBuildInfoTestCase,
-        AliasNodeInfoTestCase,
-    ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Node/FS.py b/src/engine/SCons/Node/FS.py
index a953890..6319ace 100644
--- a/src/engine/SCons/Node/FS.py
+++ b/src/engine/SCons/Node/FS.py
@@ -11,7 +11,7 @@ that can be used by scripts or modules looking for the canonical default.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ that can be used by scripts or modules looking for the canonical default.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Node/FS.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/FS.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import fnmatch
 import os
@@ -43,6 +43,7 @@ import stat
 import sys
 import time
 import codecs
+from itertools import chain
 
 import SCons.Action
 import SCons.Debug
@@ -56,9 +57,12 @@ import SCons.Util
 import SCons.Warnings
 
 from SCons.Debug import Trace
+from . import DeciderNeedsNode
 
 print_duplicate = 0
 
+MD5_TIMESTAMP_DEBUG = False
+
 
 def sconsign_none(node):
     raise NotImplementedError
@@ -74,6 +78,9 @@ def sconsign_dir(node):
 _sconsign_map = {0 : sconsign_none,
                  1 : sconsign_dir}
 
+class FileBuildInfoFileToCsigMappingError(Exception):
+    pass
+
 class EntryProxyAttributeError(AttributeError):
     """
     An AttributeError subclass for recording and displaying the name
@@ -132,7 +139,10 @@ def initialize_do_splitdrive():
     global do_splitdrive
     global has_unc
     drive, path = os.path.splitdrive('X:/foo')
-    has_unc = hasattr(os.path, 'splitunc')
+    # splitunc is removed from python 3.7 and newer
+    # so we can also just test if splitdrive works with UNC
+    has_unc = (hasattr(os.path, 'splitunc')
+        or os.path.splitdrive(r'\\split\drive\test')[0] == r'\\split\drive')
 
     do_splitdrive = not not drive or has_unc
 
@@ -282,11 +292,13 @@ def set_duplicate(duplicate):
             Link_Funcs.append(link_dict[func])
 
 def LinkFunc(target, source, env):
-    # Relative paths cause problems with symbolic links, so
-    # we use absolute paths, which may be a problem for people
-    # who want to move their soft-linked src-trees around. Those
-    # people should use the 'hard-copy' mode, softlinks cannot be
-    # used for that; at least I have no idea how ...
+    """
+    Relative paths cause problems with symbolic links, so
+    we use absolute paths, which may be a problem for people
+    who want to move their soft-linked src-trees around. Those
+    people should use the 'hard-copy' mode, softlinks cannot be
+    used for that; at least I have no idea how ...
+    """
     src = source[0].get_abspath()
     dest = target[0].get_abspath()
     dir, file = os.path.split(dest)
@@ -328,7 +340,12 @@ Unlink = SCons.Action.Action(UnlinkFunc, None)
 
 def MkdirFunc(target, source, env):
     t = target[0]
-    if not t.exists():
+    # This os.path.exists test looks redundant, but it's possible
+    # when using Install() to install multiple dirs outside the
+    # source tree to get a case where t.exists() is true but
+    # the path does already exist, so this prevents spurious
+    # build failures in that case. See test/Install/multi-dir.
+    if not t.exists() and not os.path.exists(t.get_abspath()):
         t.fs.mkdir(t.get_abspath())
     return 0
 
@@ -682,10 +699,15 @@ class Base(SCons.Node.Node):
 
     @SCons.Memoize.CountMethodCall
     def stat(self):
-        try: return self._memo['stat']
-        except KeyError: pass
-        try: result = self.fs.stat(self.get_abspath())
-        except os.error: result = None
+        try: 
+            return self._memo['stat']
+        except KeyError: 
+            pass
+        try: 
+            result = self.fs.stat(self.get_abspath())
+        except os.error: 
+            result = None
+
         self._memo['stat'] = result
         return result
 
@@ -697,13 +719,17 @@ class Base(SCons.Node.Node):
 
     def getmtime(self):
         st = self.stat()
-        if st: return st[stat.ST_MTIME]
-        else: return None
+        if st: 
+            return st[stat.ST_MTIME]
+        else: 
+            return None
 
     def getsize(self):
         st = self.stat()
-        if st: return st[stat.ST_SIZE]
-        else: return None
+        if st: 
+            return st[stat.ST_SIZE]
+        else: 
+            return None
 
     def isdir(self):
         st = self.stat()
@@ -1048,21 +1074,22 @@ _classEntry = Entry
 
 
 class LocalFS(object):
-
-    # This class implements an abstraction layer for operations involving
-    # a local file system.  Essentially, this wraps any function in
-    # the os, os.path or shutil modules that we use to actually go do
-    # anything with or to the local file system.
-    #
-    # Note that there's a very good chance we'll refactor this part of
-    # the architecture in some way as we really implement the interface(s)
-    # for remote file system Nodes.  For example, the right architecture
-    # might be to have this be a subclass instead of a base class.
-    # Nevertheless, we're using this as a first step in that direction.
-    #
-    # We're not using chdir() yet because the calling subclass method
-    # needs to use os.chdir() directly to avoid recursion.  Will we
-    # really need this one?
+    """
+    This class implements an abstraction layer for operations involving
+    a local file system.  Essentially, this wraps any function in
+    the os, os.path or shutil modules that we use to actually go do
+    anything with or to the local file system.
+
+    Note that there's a very good chance we'll refactor this part of
+    the architecture in some way as we really implement the interface(s)
+    for remote file system Nodes.  For example, the right architecture
+    might be to have this be a subclass instead of a base class.
+    Nevertheless, we're using this as a first step in that direction.
+
+    We're not using chdir() yet because the calling subclass method
+    needs to use os.chdir() directly to avoid recursion.  Will we
+    really need this one?
+    """
     #def chdir(self, path):
     #    return os.chdir(path)
     def chmod(self, path, mode):
@@ -1389,10 +1416,10 @@ class FS(LocalFS):
             if not isinstance(d, SCons.Node.Node):
                 d = self.Dir(d)
             self.Top.addRepository(d)
-    
+
     def PyPackageDir(self, modulename):
         """Locate the directory of a given python module name
-		
+
         For example scons might resolve to
         Windows: C:\Python27\Lib\site-packages\scons-2.5.1
         Linux: /usr/lib/scons
@@ -2462,11 +2489,42 @@ class FileNodeInfo(SCons.Node.NodeInfoBase):
             if key not in ('__weakref__',):
                 setattr(self, key, value)
 
+    def __eq__(self, other):
+        return self.csig == other.csig and self.timestamp == other.timestamp and self.size == other.size
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
 
 class FileBuildInfo(SCons.Node.BuildInfoBase):
-    __slots__ = ()
+    """
+    This is info loaded from sconsign.
+
+    Attributes unique to FileBuildInfo:
+        dependency_map : Caches file->csig mapping
+                    for all dependencies.  Currently this is only used when using
+                    MD5-timestamp decider.
+                    It's used to ensure that we copy the correct
+                    csig from previous build to be written to .sconsign when current build
+                    is done. Previously the matching of csig to file was strictly by order
+                    they appeared in bdepends, bsources, or bimplicit, and so a change in order
+                    or count of any of these could yield writing wrong csig, and then false positive
+                    rebuilds
+    """
+    __slots__ = ('dependency_map')
     current_version_id = 2
 
+    def __setattr__(self, key, value):
+
+        # If any attributes are changed in FileBuildInfo, we need to
+        # invalidate the cached map of file name to content signature
+        # heald in dependency_map. Currently only used with
+        # MD5-timestamp decider
+        if key != 'dependency_map' and hasattr(self, 'dependency_map'):
+            del self.dependency_map
+
+        return super(FileBuildInfo, self).__setattr__(key, value)
+
     def convert_to_sconsign(self):
         """
         Converts this FileBuildInfo object for writing to a .sconsign file
@@ -3235,14 +3293,155 @@ class File(Base):
     def changed_state(self, target, prev_ni):
         return self.state != SCons.Node.up_to_date
 
-    def changed_timestamp_then_content(self, target, prev_ni):
-        if not self.changed_timestamp_match(target, prev_ni):
+
+    # Caching node -> string mapping for the below method
+    __dmap_cache = {}
+    __dmap_sig_cache = {}
+
+
+    def _build_dependency_map(self, binfo):
+        """
+        Build mapping from file -> signature
+
+        Args:
+            self - self
+            binfo - buildinfo from node being considered
+
+        Returns:
+            dictionary of file->signature mappings
+        """
+
+        # For an "empty" binfo properties like bsources
+        # do not exist: check this to avoid exception.
+        if (len(binfo.bsourcesigs) + len(binfo.bdependsigs) + \
+            len(binfo.bimplicitsigs)) == 0:
+            return {}
+
+
+        # store this info so we can avoid regenerating it.
+        binfo.dependency_map = { str(child):signature for child, signature in zip(chain(binfo.bsources, binfo.bdepends, binfo.bimplicit),
+                                     chain(binfo.bsourcesigs, binfo.bdependsigs, binfo.bimplicitsigs))}
+
+        return binfo.dependency_map
+
+    def _get_previous_signatures(self, dmap):
+        """
+        Return a list of corresponding csigs from previous
+        build in order of the node/files in children.
+
+        Args:
+            self - self
+            dmap - Dictionary of file -> csig
+
+        Returns:
+            List of csigs for provided list of children
+        """
+        prev = []
+        # MD5_TIMESTAMP_DEBUG = False
+
+        if len(dmap) == 0:
+            if MD5_TIMESTAMP_DEBUG: print("Nothing dmap shortcutting")
+            return None
+
+        if MD5_TIMESTAMP_DEBUG: print("len(dmap):%d"%len(dmap))
+        # First try the simple name for node
+        c_str = str(self)
+        if MD5_TIMESTAMP_DEBUG: print("Checking   :%s"%c_str)
+        df = dmap.get(c_str, None)
+        if df:
+            return df
+        
+        if os.altsep:
+            c_str = c_str.replace(os.sep, os.altsep)
+            df = dmap.get(c_str, None)
+            if MD5_TIMESTAMP_DEBUG: print("-->%s"%df)
+            if df:
+                return df
+
+        if not df:
+            try:
+                # this should yield a path which matches what's in the sconsign
+                c_str = self.get_path()
+                df = dmap.get(c_str, None)
+                if MD5_TIMESTAMP_DEBUG: print("-->%s"%df)
+                if df:
+                    return df
+
+                if os.altsep:
+                    c_str = c_str.replace(os.sep, os.altsep)
+                    df = dmap.get(c_str, None)
+                    if MD5_TIMESTAMP_DEBUG: print("-->%s"%df)
+                    if df:
+                        return df
+
+            except AttributeError as e:
+                raise FileBuildInfoFileToCsigMappingError("No mapping from file name to content signature for :%s"%c_str)
+
+        return df
+
+    def changed_timestamp_then_content(self, target, prev_ni, node=None):
+        """
+        Used when decider for file is Timestamp-MD5
+
+        NOTE: If the timestamp hasn't changed this will skip md5'ing the
+              file and just copy the prev_ni provided.  If the prev_ni
+              is wrong. It will propagate it.
+              See: https://github.com/SCons/scons/issues/2980
+        
+        Args:
+            self - dependency
+            target - target
+            prev_ni - The NodeInfo object loaded from previous builds .sconsign
+            node - Node instance.  This is the only changed* function which requires
+                   node to function. So if we detect that it's not passed.
+                   we throw DeciderNeedsNode, and caller should handle this and pass node.
+
+        Returns: 
+            Boolean - Indicates if node(File) has changed.
+        """
+        if node is None:
+            # We need required node argument to get BuildInfo to function
+            raise DeciderNeedsNode(self.changed_timestamp_then_content)
+
+        # Now get sconsign name -> csig map and then get proper prev_ni if possible
+        bi = node.get_stored_info().binfo
+        rebuilt = False
+        try:
+            dependency_map = bi.dependency_map
+        except AttributeError as e:
+            dependency_map = self._build_dependency_map(bi)
+            rebuilt = True
+
+        if len(dependency_map) == 0:
+            # If there's no dependency map, there's no need to find the
+            # prev_ni as there aren't any
+            # shortcut the rest of the logic
+            if MD5_TIMESTAMP_DEBUG: print("Skipping checks len(dmap)=0")
+
+            # We still need to get the current file's csig
+            # This should be slightly faster than calling self.changed_content(target, new_prev_ni)
+            self.get_csig()
+            return True
+
+        new_prev_ni = self._get_previous_signatures(dependency_map)
+        new = self.changed_timestamp_match(target, new_prev_ni)
+
+        if MD5_TIMESTAMP_DEBUG:
+            old = self.changed_timestamp_match(target, prev_ni)
+
+            if old != new:
+                print("Mismatch self.changed_timestamp_match(%s, prev_ni) old:%s new:%s"%(str(target), old, new))
+                new_prev_ni = self._get_previous_signatures(dependency_map)
+
+
+        if not new:
             try:
-                self.get_ninfo().csig = prev_ni.csig
+                # NOTE: We're modifying the current node's csig in a query.
+                self.get_ninfo().csig = new_prev_ni.csig
             except AttributeError:
                 pass
             return False
-        return self.changed_content(target, prev_ni)
+        return self.changed_content(target, new_prev_ni)
 
     def changed_timestamp_newer(self, target, prev_ni):
         try:
@@ -3251,6 +3450,12 @@ class File(Base):
             return 1
 
     def changed_timestamp_match(self, target, prev_ni):
+        """
+        Return True if the timestamps don't match or if there is no previous timestamp
+        :param target:
+        :param prev_ni: Information about the node from the previous build
+        :return:
+        """
         try:
             return self.get_timestamp() != prev_ni.timestamp
         except AttributeError:
@@ -3272,7 +3477,9 @@ class File(Base):
                         # ...and they'd like a local copy.
                         e = LocalCopy(self, r, None)
                         if isinstance(e, SCons.Errors.BuildError):
-                            raise
+                            # Likely this should be re-raising exception e
+                            # (which would be BuildError)
+                            raise e
                         SCons.Node.store_info_map[self.store_info](self)
                     if T: Trace(' 1\n')
                     return 1
@@ -3293,11 +3500,14 @@ class File(Base):
         result = self
         if not self.exists():
             norm_name = _my_normcase(self.name)
-            for dir in self.dir.get_all_rdirs():
-                try: node = dir.entries[norm_name]
-                except KeyError: node = dir.file_on_disk(self.name)
+            for repo_dir in self.dir.get_all_rdirs():
+                try:
+                    node = repo_dir.entries[norm_name]
+                except KeyError:
+                    node = repo_dir.file_on_disk(self.name)
+
                 if node and node.exists() and \
-                   (isinstance(node, File) or isinstance(node, Entry) \
+                   (isinstance(node, File) or isinstance(node, Entry)
                     or not node.is_derived()):
                         result = node
                         # Copy over our local attributes to the repository
@@ -3317,6 +3527,28 @@ class File(Base):
         self._memo['rfile'] = result
         return result
 
+    def find_repo_file(self):
+        """
+        For this node, find if there exists a corresponding file in one or more repositories
+        :return: list of corresponding files in repositories
+        """
+        retvals = []
+
+        norm_name = _my_normcase(self.name)
+        for repo_dir in self.dir.get_all_rdirs():
+            try:
+                node = repo_dir.entries[norm_name]
+            except KeyError:
+                node = repo_dir.file_on_disk(self.name)
+
+            if node and node.exists() and \
+                    (isinstance(node, File) or isinstance(node, Entry) \
+                     or not node.is_derived()):
+                retvals.append(node)
+
+        return retvals
+
+
     def rstr(self):
         return str(self.rfile())
 
@@ -3374,6 +3606,8 @@ class File(Base):
         because multiple targets built by the same action will all
         have the same build signature, and we have to differentiate
         them somehow.
+
+        Signature should normally be string of hex digits.
         """
         try:
             return self.cachesig
@@ -3383,10 +3617,13 @@ class File(Base):
         # Collect signatures for all children
         children = self.children()
         sigs = [n.get_cachedir_csig() for n in children]
+
         # Append this node's signature...
         sigs.append(self.get_contents_sig())
+
         # ...and it's path
         sigs.append(self.get_internal_path())
+
         # Merge this all into a single signature
         result = self.cachesig = SCons.Util.MD5collect(sigs)
         return result
diff --git a/src/engine/SCons/Node/FSTests.py b/src/engine/SCons/Node/FSTests.py
index 3a36894..021d433 100644
--- a/src/engine/SCons/Node/FSTests.py
+++ b/src/engine/SCons/Node/FSTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -22,7 +22,7 @@
 #
 from __future__ import division, print_function
 
-__revision__ = "src/engine/SCons/Node/FSTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/FSTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -41,6 +41,7 @@ import SCons.Errors
 import SCons.Node.FS
 import SCons.Util
 import SCons.Warnings
+import SCons.Environment
 
 built_it = None
 
@@ -605,7 +606,7 @@ class VariantDirTestCase(unittest.TestCase):
                 print("File `%s' alter_targets() `%s' != expected `%s'" % (f, tp, expect))
                 errors = errors + 1
 
-        self.failIf(errors)
+        self.assertFalse(errors)
 
 class BaseTestCase(_tempdirTestCase):
     def test_stat(self):
@@ -1133,7 +1134,10 @@ class FSTestCase(_tempdirTestCase):
             e1 = fs.Entry(p)
             e2 = fs.Entry(path)
             assert e1 is e2, (e1, e2)
-            assert str(e1) is str(e2), (str(e1), str(e2))
+            a=str(e1)
+            b=str(e2)
+            assert a == b, ("Strings should match for same file/node\n%s\n%s"%(a,b))
+
 
         # Test for a bug in 0.04 that did not like looking up
         # dirs with a trailing slash on Windows.
@@ -1657,7 +1661,12 @@ class FSTestCase(_tempdirTestCase):
             import ntpath
             x = test.workpath(*dirs)
             drive, path = ntpath.splitdrive(x)
-            unc, path = ntpath.splitunc(path)
+            try:
+                unc, path = ntpath.splitunc(path)
+            except AttributeError:
+                # could be python 3.7 or newer, make sure splitdrive can do UNC
+                assert ntpath.splitdrive(r'\\split\drive\test')[0] == r'\\split\drive'
+                pass
             path = strip_slash(path)
             return '//' + path[1:]
 
@@ -2455,6 +2464,139 @@ class FileTestCase(_tempdirTestCase):
         assert not build_f1.exists(), "%s did not realize that %s disappeared" % (build_f1, src_f1)
         assert not os.path.exists(build_f1.get_abspath()), "%s did not get removed after %s was removed" % (build_f1, src_f1)
 
+    def test_changed(self):
+        """ 
+        Verify that changes between BuildInfo's list of souces, depends, and implicit 
+        dependencies do not corrupt content signature values written to .SConsign
+        when using CacheDir and Timestamp-MD5 decider.
+        This is for issue #2980
+        """
+        # node should have
+        # 1 source (for example main.cpp)
+        # 0 depends
+        # N implicits (for example ['alpha.h', 'beta.h', 'gamma.h', '/usr/bin/g++'])
+
+        class ChangedNode(SCons.Node.FS.File):
+            def __init__(self, name, directory=None, fs=None):
+                SCons.Node.FS.File.__init__(self, name, directory, fs)
+                self.name = name
+                self.Tag('found_includes', [])
+                self.stored_info = None
+                self.build_env = None
+                self.changed_since_last_build = 4
+                self.timestamp = 1
+
+            def get_stored_info(self):
+                return self.stored_info
+
+            def get_build_env(self):
+                return self.build_env
+
+            def get_timestamp(self):
+                """ Fake timestamp so they always match"""
+                return self.timestamp
+
+            def get_contents(self):
+                return self.name
+
+            def get_ninfo(self):
+                """ mocked to ensure csig will equal the filename"""
+                try:
+                    return self.ninfo
+                except AttributeError:
+                    self.ninfo = FakeNodeInfo(self.name, self.timestamp)
+                    return self.ninfo
+
+            def get_csig(self):
+                ninfo = self.get_ninfo()
+                try:
+                    return ninfo.csig
+                except AttributeError:
+                    pass
+
+                return "Should Never Happen"
+
+        class ChangedEnvironment(SCons.Environment.Base):
+
+            def __init__(self):
+                SCons.Environment.Base.__init__(self)
+                self.decide_source = self._changed_timestamp_then_content
+
+        class FakeNodeInfo(object):
+            def __init__(self, csig, timestamp):
+                self.csig = csig
+                self.timestamp = timestamp
+
+        #Create nodes
+        fs = SCons.Node.FS.FS()
+        d = self.fs.Dir('.')
+
+        node = ChangedNode('main.o',d,fs)  # main.o
+        s1 = ChangedNode('main.cpp',d,fs) # main.cpp
+        s1.timestamp = 2 # this changed
+        i1 = ChangedNode('alpha.h',d,fs) # alpha.h - The bug is caused because the second build adds this file
+        i1.timestamp = 2 # This is the new file.
+        i2 = ChangedNode('beta.h',d,fs) # beta.h
+        i3 = ChangedNode('gamma.h',d,fs) # gamma.h - In the bug beta.h's csig from binfo overwrites this ones
+        i4 = ChangedNode('/usr/bin/g++',d,fs) # /usr/bin/g++
+
+        node.add_source([s1])
+        node.add_dependency([])
+        node.implicit = [i1, i2, i3, i4]
+        node.implicit_set = set()
+        # node._add_child(node.implicit, node.implicit_set, [n7, n8, n9])
+        # node._add_child(node.implicit, node.implicit_set, [n10, n11, n12])
+
+        # Mock out node's scan method
+        # node.scan = lambda *args: None
+
+        # Mock out nodes' children() ?
+        # Should return Node's.
+        # All those nodes should have changed_since_last_build set to match Timestamp-MD5's
+        # decider method...
+
+        # Generate sconsign entry needed
+        sconsign_entry = SCons.SConsign.SConsignEntry()
+        sconsign_entry.binfo = node.new_binfo()
+        sconsign_entry.ninfo = node.new_ninfo()
+
+        # mock out loading info from sconsign
+        # This will cause node.get_stored_info() to return our freshly created sconsign_entry
+        node.stored_info = sconsign_entry
+
+        # binfo = information from previous build (from sconsign)
+        # We'll set the following attributes (which are lists): "bsources", "bsourcesigs",
+        # "bdepends","bdependsigs", "bimplicit", "bimplicitsigs"
+        bi = sconsign_entry.binfo
+        bi.bsources = ['main.cpp']
+        bi.bsourcesigs=[FakeNodeInfo('main.cpp',1),]
+
+        bi.bdepends = []
+        bi.bdependsigs = []
+
+        bi.bimplicit = ['beta.h','gamma.h']
+        bi.bimplicitsigs = [FakeNodeInfo('beta.h',1), FakeNodeInfo('gamma.h',1)]
+
+        ni = sconsign_entry.ninfo
+        # We'll set the following attributes (which are lists): sources, depends, implicit lists
+
+        #Set timestamp-md5
+        #Call changed
+        #Check results
+        node.build_env = ChangedEnvironment()
+
+        changed = node.changed()
+
+        # change to true to debug
+        if False:
+            print("Changed:%s"%changed)
+            print("%15s -> csig:%s"%(s1.name, s1.ninfo.csig))
+            print("%15s -> csig:%s"%(i1.name, i1.ninfo.csig))
+            print("%15s -> csig:%s"%(i2.name, i2.ninfo.csig))
+            print("%15s -> csig:%s"%(i3.name, i3.ninfo.csig))
+            print("%15s -> csig:%s"%(i4.name, i4.ninfo.csig))
+
+        self.assertEqual(i2.name,i2.ninfo.csig, "gamma.h's fake csig should equal gamma.h but equals:%s"%i2.ninfo.csig)
 
 
 class GlobTestCase(_tempdirTestCase):
@@ -3747,38 +3889,7 @@ class AbsolutePathTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    suite.addTest(VariantDirTestCase())
-    suite.addTest(find_fileTestCase())
-    suite.addTest(StringDirTestCase())
-    suite.addTest(stored_infoTestCase())
-    suite.addTest(has_src_builderTestCase())
-    suite.addTest(prepareTestCase())
-    suite.addTest(SConstruct_dirTestCase())
-    suite.addTest(clearTestCase())
-    suite.addTest(disambiguateTestCase())
-    suite.addTest(postprocessTestCase())
-    suite.addTest(SpecialAttrTestCase())
-    suite.addTest(SaveStringsTestCase())
-    tclasses = [
-        AbsolutePathTestCase,
-        BaseTestCase,
-        CacheDirTestCase,
-        DirTestCase,
-        DirBuildInfoTestCase,
-        DirNodeInfoTestCase,
-        EntryTestCase,
-        FileTestCase,
-        FileBuildInfoTestCase,
-        FileNodeInfoTestCase,
-        FSTestCase,
-        GlobTestCase,
-        RepositoryTestCase,
-    ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Node/NodeTests.py b/src/engine/SCons/Node/NodeTests.py
index e50616a..39b928b 100644
--- a/src/engine/SCons/Node/NodeTests.py
+++ b/src/engine/SCons/Node/NodeTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,7 +20,7 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Node/NodeTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/NodeTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -30,8 +30,6 @@ import re
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Node
 import SCons.Util
@@ -1337,9 +1335,9 @@ class NodeListTestCase(unittest.TestCase):
         assert s == "['n3', 'n2', 'n1']", s
 
         r = repr(nl)
-        r = re.sub('at (0[xX])?[0-9a-fA-F]+', 'at 0x', r)
+        r = re.sub(r'at (0[xX])?[0-9a-fA-F]+', 'at 0x', r)
         # Don't care about ancestry: just leaf value of MyNode
-        r = re.sub('<.*?\.MyNode', '<MyNode', r)
+        r = re.sub(r'<.*?\.MyNode', '<MyNode', r)
         # New-style classes report as "object"; classic classes report
         # as "instance"...
         r = re.sub("object", "instance", r)
@@ -1349,15 +1347,8 @@ class NodeListTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [ BuildInfoBaseTestCase,
-                 NodeInfoBaseTestCase,
-                 NodeTestCase,
-                 NodeListTestCase ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
+
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Node/Python.py b/src/engine/SCons/Node/Python.py
index 06cb93a..30daf9a 100644
--- a/src/engine/SCons/Node/Python.py
+++ b/src/engine/SCons/Node/Python.py
@@ -5,7 +5,7 @@ Python nodes.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ Python nodes.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Node/Python.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/Python.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Node
 
@@ -137,6 +137,10 @@ class Value(SCons.Node.Node):
         return contents
 
     def get_contents(self):
+        """
+        Get contents for signature calculations.
+        :return: bytes
+        """
         text_contents = self.get_text_contents()
         try:
             return text_contents.encode()
@@ -155,12 +159,17 @@ class Value(SCons.Node.Node):
     def get_csig(self, calc=None):
         """Because we're a Python value node and don't have a real
         timestamp, we get to ignore the calculator and just use the
-        value contents."""
+        value contents.
+
+        Returns string. Ideally string of hex digits. (Not bytes)
+        """
         try:
             return self.ninfo.csig
         except AttributeError:
             pass
-        contents = self.get_contents()
+
+        contents = self.get_text_contents()
+
         self.get_ninfo().csig = contents
         return contents
 
diff --git a/src/engine/SCons/Node/PythonTests.py b/src/engine/SCons/Node/PythonTests.py
index aab7e85..2b35f00 100644
--- a/src/engine/SCons/Node/PythonTests.py
+++ b/src/engine/SCons/Node/PythonTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Node/PythonTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/PythonTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Node.Python
 
@@ -90,15 +88,15 @@ class ValueTestCase(unittest.TestCase):
         """
         v1 = SCons.Node.Python.Value('aaa')
         csig = v1.get_csig(None)
-        assert csig.decode() == 'aaa', csig
+        assert csig == 'aaa', csig
 
         v2 = SCons.Node.Python.Value(7)
         csig = v2.get_csig(None)
-        assert csig.decode() == '7', csig
+        assert csig == '7', csig
 
         v3 = SCons.Node.Python.Value(None)
         csig = v3.get_csig(None)
-        assert csig.decode() == 'None', csig
+        assert csig == 'None', csig
 
 class ValueNodeInfoTestCase(unittest.TestCase):
     def test___init__(self):
@@ -113,16 +111,7 @@ class ValueBuildInfoTestCase(unittest.TestCase):
         bi = SCons.Node.Python.ValueBuildInfo()
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [
-        ValueTestCase,
-        ValueBuildInfoTestCase,
-        ValueNodeInfoTestCase,
-    ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Node/__init__.py b/src/engine/SCons/Node/__init__.py
index 793e101..564e8de 100644
--- a/src/engine/SCons/Node/__init__.py
+++ b/src/engine/SCons/Node/__init__.py
@@ -22,7 +22,7 @@ be able to depend on any other type of "thing."
 from __future__ import print_function
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -43,8 +43,9 @@ from __future__ import print_function
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Node/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Node/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
+import os
 import collections
 import copy
 from itertools import chain
@@ -139,6 +140,7 @@ def exists_entry(node):
     node.disambiguate()
     return _exists_map[node._func_exists](node)
 
+
 def exists_file(node):
     # Duplicate from source path if we are set up to do this.
     if node.duplicate and not node.is_derived() and not node.linked:
@@ -155,7 +157,7 @@ def exists_file(node):
                     # The source file does not exist.  Make sure no old
                     # copy remains in the variant directory.
                     if print_duplicate:
-                        print("dup: no src for %s, unlinking old variant copy"%self)
+                        print("dup: no src for %s, unlinking old variant copy" % node)
                     if exists_base(node) or node.islink():
                         node.fs.unlink(node.get_internal_path())
                     # Return None explicitly because the Base.exists() call
@@ -246,6 +248,21 @@ _target_from_source_map = {0 : target_from_source_none,
 # used by it.
 #
 
+
+class DeciderNeedsNode(Exception):
+    """
+    Indicate that the decider needs the node as well as the target and the dependency.
+    Normally the node and the target are the same, but in the case of repository
+    They may be different. Also the NodeInfo is retrieved from the node
+    """
+    def __init__(self, call_this_decider):
+        """
+        :param call_this_decider: to return the decider to call directly since deciders
+               are called through several levels of indirection
+        """
+        self.decider = call_this_decider
+
+
 #
 # First, the single decider functions
 #
@@ -269,6 +286,7 @@ def changed_since_last_build_node(node, target, prev_ni):
     """
     raise NotImplementedError
 
+
 def changed_since_last_build_alias(node, target, prev_ni):
     cur_csig = node.get_csig()
     try:
@@ -276,19 +294,24 @@ def changed_since_last_build_alias(node, target, prev_ni):
     except AttributeError:
         return 1
 
+
 def changed_since_last_build_entry(node, target, prev_ni):
     node.disambiguate()
     return _decider_map[node.changed_since_last_build](node, target, prev_ni)
 
+
 def changed_since_last_build_state_changed(node, target, prev_ni):
-    return (node.state != SCons.Node.up_to_date)
+    return node.state != SCons.Node.up_to_date
+
 
 def decide_source(node, target, prev_ni):
     return target.get_build_env().decide_source(node, target, prev_ni)
 
+
 def decide_target(node, target, prev_ni):
     return target.get_build_env().decide_target(node, target, prev_ni)
 
+
 def changed_since_last_build_python(node, target, prev_ni):
     cur_csig = node.get_csig()
     try:
@@ -380,6 +403,7 @@ class NodeInfoBase(object):
         """
         state = other.__getstate__()
         self.__setstate__(state)
+
     def format(self, field_list=None, names=0):
         if field_list is None:
             try:
@@ -665,7 +689,7 @@ class Node(object, with_metaclass(NoSlotsPyPy)):
                 executor.cleanup()
 
     def reset_executor(self):
-        "Remove cached executor; forces recompute when needed."
+        """Remove cached executor; forces recompute when needed."""
         try:
             delattr(self, 'executor')
         except AttributeError:
@@ -1136,7 +1160,7 @@ class Node(object, with_metaclass(NoSlotsPyPy)):
             binfo.bactsig = SCons.Util.MD5signature(executor.get_contents())
 
         if self._specific_sources:
-            sources = [ s for s in self.sources if not s in ignore_set]
+            sources = [s for s in self.sources if not s in ignore_set]
 
         else:
             sources = executor.get_unignored_sources(self, self.ignore)
@@ -1145,13 +1169,17 @@ class Node(object, with_metaclass(NoSlotsPyPy)):
         binfo.bsources = [s for s in sources if s not in seen and not seen.add(s)]
         binfo.bsourcesigs = [s.get_ninfo() for s in binfo.bsources]
 
+        binfo.bdepends = [d for d in self.depends if d not in ignore_set]
+        binfo.bdependsigs = [d.get_ninfo() for d in self.depends]
 
-        binfo.bdepends = self.depends
-        binfo.bdependsigs = [d.get_ninfo() for d in self.depends if d not in ignore_set]
-
-        binfo.bimplicit = self.implicit or []
-        binfo.bimplicitsigs = [i.get_ninfo() for i in binfo.bimplicit if i not in ignore_set]
-
+        # Because self.implicit is initialized to None (and not empty list [])
+        # we have to handle this case
+        if not self.implicit:
+            binfo.bimplicit = []
+            binfo.bimplicitsigs = []
+        else:
+            binfo.bimplicit = [i for i in self.implicit if i not in ignore_set]
+            binfo.bimplicitsigs = [i.get_ninfo() for i in binfo.bimplicit]
 
         return binfo
 
@@ -1213,7 +1241,7 @@ class Node(object, with_metaclass(NoSlotsPyPy)):
         return _exists_map[self._func_exists](self)
 
     def rexists(self):
-        """Does this node exist locally or in a repositiory?"""
+        """Does this node exist locally or in a repository?"""
         # There are no repositories by default:
         return _rexists_map[self._func_rexists](self)
 
@@ -1452,13 +1480,18 @@ class Node(object, with_metaclass(NoSlotsPyPy)):
             result = True
 
         for child, prev_ni in zip(children, then):
-            if _decider_map[child.changed_since_last_build](child, self, prev_ni):
-                if t: Trace(': %s changed' % child)
-                result = True
+            try:
+                if _decider_map[child.changed_since_last_build](child, self, prev_ni):
+                    if t: Trace(': %s changed' % child)
+                    result = True
+            except DeciderNeedsNode as e:
+                if e.decider(self, prev_ni, node=node):
+                    if t: Trace(': %s changed' % child)
+                    result = True
 
-        contents = self.get_executor().get_contents()
         if self.has_builder():
             import SCons.Util
+            contents = self.get_executor().get_contents()
             newsig = SCons.Util.MD5signature(contents)
             if bi.bactsig != newsig:
                 if t: Trace(': bactsig %s != newsig %s' % (bi.bactsig, newsig))
@@ -1607,7 +1640,7 @@ class Node(object, with_metaclass(NoSlotsPyPy)):
         # so we only print them after running them through this lambda
         # to turn them into the right relative Node and then return
         # its string.
-        def stringify( s, E=self.dir.Entry ) :
+        def stringify( s, E=self.dir.Entry):
             if hasattr( s, 'dir' ) :
                 return str(E(s))
             return str(s)
@@ -1616,15 +1649,21 @@ class Node(object, with_metaclass(NoSlotsPyPy)):
 
         removed = [x for x in old_bkids if not x in new_bkids]
         if removed:
-            removed = list(map(stringify, removed))
+            removed = [stringify(r) for r in removed]
             fmt = "`%s' is no longer a dependency\n"
             lines.extend([fmt % s for s in removed])
 
         for k in new_bkids:
             if not k in old_bkids:
                 lines.append("`%s' is a new dependency\n" % stringify(k))
-            elif _decider_map[k.changed_since_last_build](k, self, osig[k]):
-                lines.append("`%s' changed\n" % stringify(k))
+            else:
+                try:
+                    changed = _decider_map[k.changed_since_last_build](k, self, osig[k])
+                except DeciderNeedsNode as e:
+                    changed = e.decider(self, osig[k], node=self)
+
+                if changed:
+                    lines.append("`%s' changed\n" % stringify(k))
 
         if len(lines) == 0 and old_bkids != new_bkids:
             lines.append("the dependency order changed:\n" +
diff --git a/src/engine/SCons/Options/PackageOption.py b/src/engine/SCons/Options/PackageOption.py
deleted file mode 100644
index 6ebeca2..0000000
--- a/src/engine/SCons/Options/PackageOption.py
+++ /dev/null
@@ -1,50 +0,0 @@
-#
-# Copyright (c) 2001 - 2017 The SCons Foundation
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be included
-# in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
-# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-#
-
-__revision__ = "src/engine/SCons/Options/PackageOption.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
-
-__doc__ = """Place-holder for the old SCons.Options module hierarchy
-
-This is for backwards compatibility.  The new equivalent is the Variables/
-class hierarchy.  These will have deprecation warnings added (some day),
-and will then be removed entirely (some day).
-"""
-
-import SCons.Variables
-import SCons.Warnings
-
-warned = False
-
-def PackageOption(*args, **kw):
-    global warned
-    if not warned:
-        msg = "The PackageOption() function is deprecated; use the PackageVariable() function instead."
-        SCons.Warnings.warn(SCons.Warnings.DeprecatedOptionsWarning, msg)
-        warned = True
-    return SCons.Variables.PackageVariable(*args, **kw)
-
-# Local Variables:
-# tab-width:4
-# indent-tabs-mode:nil
-# End:
-# vim: set expandtab tabstop=4 shiftwidth=4:
diff --git a/src/engine/SCons/Options/PathOption.py b/src/engine/SCons/Options/PathOption.py
deleted file mode 100644
index b177687..0000000
--- a/src/engine/SCons/Options/PathOption.py
+++ /dev/null
@@ -1,76 +0,0 @@
-#
-# Copyright (c) 2001 - 2017 The SCons Foundation
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be included
-# in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
-# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-#
-
-__revision__ = "src/engine/SCons/Options/PathOption.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
-
-__doc__ = """Place-holder for the old SCons.Options module hierarchy
-
-This is for backwards compatibility.  The new equivalent is the Variables/
-class hierarchy.  These will have deprecation warnings added (some day),
-and will then be removed entirely (some day).
-"""
-
-import SCons.Variables
-import SCons.Warnings
-
-warned = False
-
-class _PathOptionClass(object):
-    def warn(self):
-        global warned
-        if not warned:
-            msg = "The PathOption() function is deprecated; use the PathVariable() function instead."
-            SCons.Warnings.warn(SCons.Warnings.DeprecatedOptionsWarning, msg)
-            warned = True
-
-    def __call__(self, *args, **kw):
-        self.warn()
-        return SCons.Variables.PathVariable(*args, **kw)
-
-    def PathAccept(self, *args, **kw):
-        self.warn()
-        return SCons.Variables.PathVariable.PathAccept(*args, **kw)
-
-    def PathIsDir(self, *args, **kw):
-        self.warn()
-        return SCons.Variables.PathVariable.PathIsDir(*args, **kw)
-
-    def PathIsDirCreate(self, *args, **kw):
-        self.warn()
-        return SCons.Variables.PathVariable.PathIsDirCreate(*args, **kw)
-
-    def PathIsFile(self, *args, **kw):
-        self.warn()
-        return SCons.Variables.PathVariable.PathIsFile(*args, **kw)
-
-    def PathExists(self, *args, **kw):
-        self.warn()
-        return SCons.Variables.PathVariable.PathExists(*args, **kw)
-
-PathOption = _PathOptionClass()
-
-# Local Variables:
-# tab-width:4
-# indent-tabs-mode:nil
-# End:
-# vim: set expandtab tabstop=4 shiftwidth=4:
diff --git a/src/engine/SCons/Options/__init__.py b/src/engine/SCons/Options/__init__.py
deleted file mode 100644
index 8825d10..0000000
--- a/src/engine/SCons/Options/__init__.py
+++ /dev/null
@@ -1,67 +0,0 @@
-#
-# Copyright (c) 2001 - 2017 The SCons Foundation
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be included
-# in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
-# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-#
-
-__revision__ = "src/engine/SCons/Options/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
-
-__doc__ = """Place-holder for the old SCons.Options module hierarchy
-
-This is for backwards compatibility.  The new equivalent is the Variables/
-class hierarchy.  These will have deprecation warnings added (some day),
-and will then be removed entirely (some day).
-"""
-
-import SCons.Variables
-import SCons.Warnings
-
-from .BoolOption import BoolOption  # okay
-from .EnumOption import EnumOption  # okay
-from .ListOption import ListOption  # naja
-from .PackageOption import PackageOption # naja
-from .PathOption import PathOption # okay
-
-warned = False
-
-class Options(SCons.Variables.Variables):
-    def __init__(self, *args, **kw):
-        global warned
-        if not warned:
-            msg = "The Options class is deprecated; use the Variables class instead."
-            SCons.Warnings.warn(SCons.Warnings.DeprecatedOptionsWarning, msg)
-            warned = True
-        SCons.Variables.Variables.__init__(self, *args, **kw)
-
-    def AddOptions(self, *args, **kw):
-        return SCons.Variables.Variables.AddVariables(self, *args, **kw)
-
-    def UnknownOptions(self, *args, **kw):
-        return SCons.Variables.Variables.UnknownVariables(self, *args, **kw)
-
-    def FormatOptionHelpText(self, *args, **kw):
-        return SCons.Variables.Variables.FormatVariableHelpText(self, *args,
-                     **kw)
-
-# Local Variables:
-# tab-width:4
-# indent-tabs-mode:nil
-# End:
-# vim: set expandtab tabstop=4 shiftwidth=4:
diff --git a/src/engine/SCons/PathList.py b/src/engine/SCons/PathList.py
index 680b853..98a160c 100644
--- a/src/engine/SCons/PathList.py
+++ b/src/engine/SCons/PathList.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/PathList.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/PathList.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """SCons.PathList
 
diff --git a/src/engine/SCons/PathListTests.py b/src/engine/SCons/PathListTests.py
index 0e5f319..ea9e3ff 100644
--- a/src/engine/SCons/PathListTests.py
+++ b/src/engine/SCons/PathListTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/PathListTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/PathListTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
diff --git a/src/engine/SCons/Platform/PlatformTests.py b/src/engine/SCons/Platform/PlatformTests.py
index 686d0d2..21dbf18 100644
--- a/src/engine/SCons/Platform/PlatformTests.py
+++ b/src/engine/SCons/Platform/PlatformTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,15 +21,13 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/PlatformTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/PlatformTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
 import collections
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Platform
 import SCons.Environment
@@ -38,7 +36,7 @@ import SCons.Action
 class Environment(collections.UserDict):
     def Detect(self, cmd):
         return cmd
-    
+
     def AppendENVPath(self, key, value):
         pass
 
@@ -176,9 +174,9 @@ class TempFileMungeTestCase(unittest.TestCase):
         SCons.Action.print_actions = 0
         # Create an instance of object derived class to allow setattrb
         class Node(object) :
-            class Attrs(object): 
+            class Attrs(object):
                 pass
-            def __init__(self): 
+            def __init__(self):
                 self.attributes = self.Attrs()
         target = [Node()]
         cmd = t(target, None, env, 0)
@@ -204,17 +202,8 @@ class PlatformEscapeTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    
-    tclasses = [ PlatformTestCase,
-                 TempFileMungeTestCase,
-                 PlatformEscapeTestCase,
-                ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    
-    TestUnit.run(suite)
+    unittest.main()
+
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Platform/__init__.py b/src/engine/SCons/Platform/__init__.py
index 61a4010..ab4b293 100644
--- a/src/engine/SCons/Platform/__init__.py
+++ b/src/engine/SCons/Platform/__init__.py
@@ -20,7 +20,7 @@ their own platform definition.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -43,7 +43,7 @@ their own platform definition.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Platform/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -87,6 +87,7 @@ def platform_default():
     else:
         return sys.platform
 
+
 def platform_module(name = platform_default()):
     """Return the imported module for the platform.
 
@@ -117,11 +118,13 @@ def platform_module(name = platform_default()):
             setattr(SCons.Platform, name, mod)
     return sys.modules[full_name]
 
+
 def DefaultToolList(platform, env):
     """Select a default tool list for the specified platform.
     """
     return SCons.Tool.tool_list(platform, env)
 
+
 class PlatformSpec(object):
     def __init__(self, name, generate):
         self.name = name
@@ -133,6 +136,7 @@ class PlatformSpec(object):
     def __str__(self):
         return self.name
 
+
 class TempFileMunge(object):
     """A callable class.  You can set an Environment variable to this,
     then call it with a string argument, then it will perform temporary
@@ -140,15 +144,20 @@ class TempFileMunge(object):
     line limitation.
 
     Example usage:
-    env["TEMPFILE"] = TempFileMunge
-    env["LINKCOM"] = "${TEMPFILE('$LINK $TARGET $SOURCES','$LINKCOMSTR')}"
+        env["TEMPFILE"] = TempFileMunge
+        env["LINKCOM"] = "${TEMPFILE('$LINK $TARGET $SOURCES','$LINKCOMSTR')}"
 
     By default, the name of the temporary file used begins with a
-    prefix of '@'.  This may be configred for other tool chains by
-    setting '$TEMPFILEPREFIX'.
-
-    env["TEMPFILEPREFIX"] = '-@'        # diab compiler
-    env["TEMPFILEPREFIX"] = '-via'      # arm tool chain
+    prefix of '@'.  This may be configured for other tool chains by
+    setting '$TEMPFILEPREFIX':
+        env["TEMPFILEPREFIX"] = '-@'        # diab compiler
+        env["TEMPFILEPREFIX"] = '-via'      # arm tool chain
+        env["TEMPFILEPREFIX"] = ''          # (the empty string) PC Lint
+
+    You can configure the extension of the temporary file through the
+    TEMPFILESUFFIX variable, which defaults to '.lnk' (see comments
+    in the code below):
+        env["TEMPFILESUFFIX"] = '.lnt'   # PC Lint
     """
     def __init__(self, cmd, cmdstr = None):
         self.cmd = cmd
@@ -185,21 +194,26 @@ class TempFileMunge(object):
         node = target[0] if SCons.Util.is_List(target) else target
         cmdlist = getattr(node.attributes, 'tempfile_cmdlist', None) \
                     if node is not None else None
-        if cmdlist is not None :
+        if cmdlist is not None:
             return cmdlist
 
         # We do a normpath because mktemp() has what appears to be
         # a bug in Windows that will use a forward slash as a path
-        # delimiter.  Windows's link mistakes that for a command line
+        # delimiter.  Windows' link mistakes that for a command line
         # switch and barfs.
         #
-        # We use the .lnk suffix for the benefit of the Phar Lap
+        # Default to the .lnk suffix for the benefit of the Phar Lap
         # linkloc linker, which likes to append an .lnk suffix if
         # none is given.
-        (fd, tmp) = tempfile.mkstemp('.lnk', text=True)
+        if env.has_key('TEMPFILESUFFIX'):
+            suffix = env.subst('$TEMPFILESUFFIX')
+        else:
+            suffix = '.lnk'
+
+        fd, tmp = tempfile.mkstemp(suffix, text=True)
         native_tmp = SCons.Util.get_native_path(os.path.normpath(tmp))
 
-        if env.get('SHELL',None) == 'sh':
+        if env.get('SHELL', None) == 'sh':
             # The sh shell will try to escape the backslashes in the
             # path, so unescape them.
             native_tmp = native_tmp.replace('\\', r'\\\\')
@@ -239,8 +253,9 @@ class TempFileMunge(object):
                                source) if self.cmdstr is not None else ''
             # Print our message only if XXXCOMSTR returns an empty string
             if len(cmdstr) == 0 :
-                print("Using tempfile "+native_tmp+" for command line:\n"+
-                      str(cmd[0]) + " " + " ".join(args))
+                cmdstr = ("Using tempfile "+native_tmp+" for command line:\n"+
+                    str(cmd[0]) + " " + " ".join(args))
+                self._print_cmd_str(target, source, env, cmdstr)
 
         # Store the temporary file command list into the target Node.attributes
         # to avoid creating two temporary files one for print and one for execute.
@@ -252,6 +267,23 @@ class TempFileMunge(object):
                 pass
         return cmdlist
 
+    def _print_cmd_str(self, target, source, env, cmdstr):
+        # check if the user has specified a cmd line print function
+        print_func = None
+        try:
+            get = env.get
+        except AttributeError:
+            pass
+        else:
+            print_func = get('PRINT_CMD_LINE_FUNC')
+
+        # use the default action cmd line print if user did not supply one
+        if not print_func:
+            action = SCons.Action._ActionAction()
+            action.print_cmd_line(cmdstr, target, source, env)
+        else:
+            print_func(cmdstr, target, source, env)
+
 
 def Platform(name = platform_default()):
     """Select a canned Platform specification.
diff --git a/src/engine/SCons/Platform/__init__.xml b/src/engine/SCons/Platform/__init__.xml
index cb83a9f..60bfb38 100644
--- a/src/engine/SCons/Platform/__init__.xml
+++ b/src/engine/SCons/Platform/__init__.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -232,13 +232,29 @@ The suffix used for shared object file names.
 <summary>
 <para>
 The prefix for a temporary file used
-to execute lines longer than $MAXLINELENGTH.
-The default is '@'.
-This may be set for toolchains that use other values,
-such as '-@' for the diab compiler
+to store lines lines longer than $MAXLINELENGTH
+as operations which call out to a shell will fail
+if the line is too long, which particularly
+impacts linking.
+The default is '@', which works for the Microsoft
+and GNU toolchains on Windows.
+Set this appropriately for other toolchains,
+for example '-@' for the diab compiler
 or '-via' for ARM toolchain.
 </para>
 </summary>
 </cvar>
 
+<cvar name="TEMPFILESUFFIX">
+<summary>
+<para>
+The suffix used for the temporary file name
+used for long command lines. The name should
+include the dot ('.') if one is wanted as
+it will not be added automatically.
+The default is '.lnk'.
+</para>
+</summary>
+</cvar>
+
 </sconsdoc>
diff --git a/src/engine/SCons/Platform/aix.py b/src/engine/SCons/Platform/aix.py
index caeb3fb..ba10ae6 100644
--- a/src/engine/SCons/Platform/aix.py
+++ b/src/engine/SCons/Platform/aix.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/aix.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/aix.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import subprocess
diff --git a/src/engine/SCons/Platform/cygwin.py b/src/engine/SCons/Platform/cygwin.py
index 0e30b5f..7538f0a 100644
--- a/src/engine/SCons/Platform/cygwin.py
+++ b/src/engine/SCons/Platform/cygwin.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,11 +30,20 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/cygwin.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/cygwin.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
+
+import sys
 
 from . import posix
 from SCons.Platform import TempFileMunge
 
+CYGWIN_DEFAULT_PATHS = []
+if sys.platform == 'win32':
+    CYGWIN_DEFAULT_PATHS = [
+        r'C:\cygwin64\bin',
+        r'C:\cygwin\bin'
+    ]
+
 def generate(env):
     posix.generate(env)
 
diff --git a/src/engine/SCons/Platform/darwin.py b/src/engine/SCons/Platform/darwin.py
index 70ffcf4..fc6e890 100644
--- a/src/engine/SCons/Platform/darwin.py
+++ b/src/engine/SCons/Platform/darwin.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/darwin.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/darwin.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import posix
 import os
diff --git a/src/engine/SCons/Platform/hpux.py b/src/engine/SCons/Platform/hpux.py
index 8b34901..ccda01e 100644
--- a/src/engine/SCons/Platform/hpux.py
+++ b/src/engine/SCons/Platform/hpux.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/hpux.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/hpux.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import posix
 
diff --git a/src/engine/SCons/Platform/irix.py b/src/engine/SCons/Platform/irix.py
index 1ff4530..38f0f26 100644
--- a/src/engine/SCons/Platform/irix.py
+++ b/src/engine/SCons/Platform/irix.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/irix.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/irix.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import posix
 
diff --git a/src/engine/SCons/Options/ListOption.py b/src/engine/SCons/Platform/mingw.py
index d4e63af..95fb2e4 100644
--- a/src/engine/SCons/Options/ListOption.py
+++ b/src/engine/SCons/Platform/mingw.py
@@ -1,5 +1,11 @@
+"""SCons.Platform.mingw
+
+Platform-specific initialization for the MinGW system.
+
+"""
+
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,30 +27,13 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Options/ListOption.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
-
-__doc__ = """Place-holder for the old SCons.Options module hierarchy
-
-This is for backwards compatibility.  The new equivalent is the Variables/
-class hierarchy.  These will have deprecation warnings added (some day),
-and will then be removed entirely (some day).
-"""
-
-import SCons.Variables
-import SCons.Warnings
-
-warned = False
+__revision__ = "src/engine/SCons/Platform/mingw.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
-def ListOption(*args, **kw):
-    global warned
-    if not warned:
-        msg = "The ListOption() function is deprecated; use the ListVariable() function instead."
-        SCons.Warnings.warn(SCons.Warnings.DeprecatedOptionsWarning, msg)
-        warned = True
-    return SCons.Variables.ListVariable(*args, **kw)
+import sys
 
-# Local Variables:
-# tab-width:4
-# indent-tabs-mode:nil
-# End:
-# vim: set expandtab tabstop=4 shiftwidth=4:
+MINGW_DEFAULT_PATHS = []
+if sys.platform == 'win32':
+    MINGW_DEFAULT_PATHS = [
+        r'C:\msys64',
+        r'C:\msys'
+    ]
+\ No newline at end of file
diff --git a/src/engine/SCons/Platform/os2.py b/src/engine/SCons/Platform/os2.py
index cd1c35c..bc49c88 100644
--- a/src/engine/SCons/Platform/os2.py
+++ b/src/engine/SCons/Platform/os2.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/os2.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/os2.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 from . import win32
 
 def generate(env):
diff --git a/src/engine/SCons/Platform/posix.py b/src/engine/SCons/Platform/posix.py
index 890a70a..27c3f3a 100644
--- a/src/engine/SCons/Platform/posix.py
+++ b/src/engine/SCons/Platform/posix.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/posix.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/posix.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import errno
 import os
@@ -41,6 +41,8 @@ import select
 
 import SCons.Util
 from SCons.Platform import TempFileMunge
+from SCons.Platform.virtualenv import ImportVirtualenv
+from SCons.Platform.virtualenv import ignore_virtualenv, enable_virtualenv
 
 exitvalmap = {
     2 : 127,
@@ -48,7 +50,7 @@ exitvalmap = {
 }
 
 def escape(arg):
-    "escape shell special characters" 
+    """escape shell special characters"""
     slash = '\\'
     special = '"$'
 
@@ -119,6 +121,9 @@ def generate(env):
     # Must be able to have GCC and DMD work in the same build, so:
     env['__DRPATH'] = '$_DRPATH'
 
+    if enable_virtualenv and not ignore_virtualenv:
+        ImportVirtualenv(env)
+
 # Local Variables:
 # tab-width:4
 # indent-tabs-mode:nil
diff --git a/src/engine/SCons/Platform/posix.xml b/src/engine/SCons/Platform/posix.xml
index 00d42ab..a710230 100644
--- a/src/engine/SCons/Platform/posix.xml
+++ b/src/engine/SCons/Platform/posix.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -46,7 +46,7 @@ An automatically-generated construction variable
 containing the rpath flags to be used when linking
 a program with shared libraries.
 The value of &cv-_RPATH; is created
-by appending &cv-RPATHPREFIX; and &cv-RPATHSUFFIX;
+by respectively prepending &cv-RPATHPREFIX; and appending &cv-RPATHSUFFIX;
 to the beginning and end
 of each directory in &cv-RPATH;.
 </para>
@@ -58,7 +58,7 @@ of each directory in &cv-RPATH;.
 <para>
 The prefix used to specify a directory to be searched for
 shared libraries when running programs.
-This will be appended to the beginning of each directory
+This will be prepended to the beginning of each directory
 in the &cv-RPATH; construction variable
 when the &cv-_RPATH; variable is automatically generated.
 </para>
diff --git a/src/engine/SCons/Platform/sunos.py b/src/engine/SCons/Platform/sunos.py
index 3279fb9..b54be76 100644
--- a/src/engine/SCons/Platform/sunos.py
+++ b/src/engine/SCons/Platform/sunos.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/sunos.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/sunos.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import posix
 
diff --git a/src/engine/SCons/Platform/sunos.xml b/src/engine/SCons/Platform/sunos.xml
index 541c862..abab196 100644
--- a/src/engine/SCons/Platform/sunos.xml
+++ b/src/engine/SCons/Platform/sunos.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Platform/virtualenv.py b/src/engine/SCons/Platform/virtualenv.py
new file mode 100644
index 0000000..e24fb7a
--- /dev/null
+++ b/src/engine/SCons/Platform/virtualenv.py
@@ -0,0 +1,120 @@
+"""SCons.Platform.virtualenv
+
+Support for virtualenv.
+"""
+
+#
+# Copyright (c) 2001 - 2019 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "src/engine/SCons/Platform/virtualenv.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
+
+import os
+import sys
+import SCons.Util
+
+
+virtualenv_enabled_by_default = False
+
+
+def _enable_virtualenv_default():
+    return SCons.Util.get_os_env_bool('SCONS_ENABLE_VIRTUALENV', virtualenv_enabled_by_default)
+
+
+def _ignore_virtualenv_default():
+    return SCons.Util.get_os_env_bool('SCONS_IGNORE_VIRTUALENV', False)
+
+
+enable_virtualenv = _enable_virtualenv_default()
+ignore_virtualenv = _ignore_virtualenv_default()
+virtualenv_variables = ['VIRTUAL_ENV', 'PIPENV_ACTIVE']
+
+
+def _running_in_virtualenv():
+    """Returns True, if scons is executed within a virtualenv"""
+    # see https://stackoverflow.com/a/42580137
+    return (hasattr(sys, 'real_prefix') or
+            (hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix))
+
+
+def _is_path_in(path, base):
+    """Returns true, if **path** is located under the **base** directory."""
+    if not path or not base: # empty path may happen, base too
+        return False
+    rp = os.path.relpath(path, base)
+    return ((not rp.startswith(os.path.pardir)) and (not rp == os.path.curdir))
+
+
+def _inject_venv_variables(env):
+    if 'ENV' not in env:
+        env['ENV'] = {}
+    ENV = env['ENV']
+    for name in virtualenv_variables:
+        try:
+            ENV[name] = os.environ[name]
+        except KeyError:
+            pass
+
+def _inject_venv_path(env, path_list=None):
+    """Modify environment such that SCons will take into account its virtualenv
+    when running external tools."""
+    if path_list is None:
+        path_list = os.getenv('PATH')
+    env.PrependENVPath('PATH', select_paths_in_venv(path_list))
+
+
+def select_paths_in_venv(path_list):
+    """Returns a list of paths from **path_list** which are under virtualenv's
+    home directory."""
+    if SCons.Util.is_String(path_list):
+        path_list = path_list.split(os.path.pathsep)
+    # Find in path_list the paths under the virtualenv's home
+    return [path for path in path_list if IsInVirtualenv(path)]
+
+
+def ImportVirtualenv(env):
+    """Copies virtualenv-related environment variables from OS environment
+    to ``env['ENV']`` and prepends virtualenv's PATH to ``env['ENV']['PATH']``.
+    """
+    _inject_venv_variables(env)
+    _inject_venv_path(env)
+
+
+def Virtualenv():
+    """Returns path to the virtualenv home if scons is executing within a
+    virtualenv or None, if not."""
+    if _running_in_virtualenv():
+        return sys.prefix
+    return None
+
+
+def IsInVirtualenv(path):
+    """Returns True, if **path** is under virtualenv's home directory. If not,
+    or if we don't use virtualenv, returns False."""
+    return _is_path_in(path, Virtualenv())
+
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4:
diff --git a/src/engine/SCons/Platform/virtualenvTests.py b/src/engine/SCons/Platform/virtualenvTests.py
new file mode 100644
index 0000000..f560f2e
--- /dev/null
+++ b/src/engine/SCons/Platform/virtualenvTests.py
@@ -0,0 +1,243 @@
+#
+# Copyright (c) 2001 - 2019 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "src/engine/SCons/Platform/virtualenvTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
+
+import SCons.compat
+
+import collections
+import unittest
+import os
+import sys
+
+import SCons.Platform.virtualenv
+import SCons.Util
+
+class Environment(collections.UserDict):
+    def Detect(self, cmd):
+        return cmd
+
+    def AppendENVPath(self, key, value):
+        if SCons.Util.is_List(value):
+            value =  os.path.pathsep.join(value)
+        if 'ENV' not in self:
+            self['ENV'] = {}
+        current = self['ENV'].get(key)
+        if not current:
+            self['ENV'][key] = value
+        else:
+            self['ENV'][key] = os.path.pathsep.join([current, value])
+
+    def PrependENVPath(self, key, value):
+        if SCons.Util.is_List(value):
+            value =  os.path.pathsep.join(value)
+        if 'ENV' not in self:
+            self['ENV'] = {}
+        current = self['ENV'].get(key)
+        if not current:
+            self['ENV'][key] = value
+        else:
+            self['ENV'][key] = os.path.pathsep.join([value, current])
+
+class SysPrefixes(object):
+    """Used to temporarily mock sys.prefix, sys.real_prefix and sys.base_prefix"""
+    def __init__(self, prefix, real_prefix=None, base_prefix=None):
+        self._prefix = prefix
+        self._real_prefix = real_prefix
+        self._base_prefix = base_prefix
+
+    def start(self):
+        self._store()
+        sys.prefix = self._prefix
+        if self._real_prefix is None:
+            if hasattr(sys, 'real_prefix'):
+                del sys.real_prefix
+        else:
+            sys.real_prefix = self._real_prefix
+        if self._base_prefix is None:
+            if hasattr(sys, 'base_prefix'):
+                del sys.base_prefix
+        else:
+            sys.base_prefix = self._base_prefix
+
+    def stop(self):
+        self._restore()
+
+    def __enter__(self):
+        self.start()
+        attrs = ('prefix', 'real_prefix', 'base_prefix')
+        return {k: getattr(sys, k) for k in attrs if hasattr(sys, k)}
+
+    def __exit__(self, *args):
+        self.stop()
+
+    def _store(self):
+        s = dict()
+        if hasattr(sys, 'real_prefix'):
+            s['real_prefix'] = sys.real_prefix
+        if hasattr(sys, 'base_prefix'):
+            s['base_prefix'] = sys.base_prefix
+        s['prefix'] = sys.prefix
+        self._stored = s
+
+    def _restore(self):
+        s = self._stored
+        if 'real_prefix' in s:
+            sys.real_prefix = s['real_prefix']
+        if 'base_prefix' in s:
+            sys.base_prefix = s['base_prefix']
+        if 'prefix' in s:
+            sys.prefix = s['prefix']
+        del self._stored
+
+def _p(p):
+    """Converts path string **p** from posix format to os-specific format."""
+    drive = []
+    if p.startswith('/') and sys.platform == 'win32':
+            drive = ['C:']
+    pieces = p.split('/')
+    return os.path.sep.join(drive + pieces)
+
+
+class _is_path_in_TestCase(unittest.TestCase):
+    def test_false(self):
+        for args in [   ('',''),
+                        ('', _p('/foo/bar')),
+                        (_p('/foo/bar'), ''),
+                        (_p('/foo/bar'), _p('/foo/bar')),
+                        (_p('/foo/bar'), _p('/foo/bar/geez')),
+                        (_p('/'), _p('/foo')),
+                        (_p('foo'), _p('foo/bar')) ]:
+            assert SCons.Platform.virtualenv._is_path_in(*args) is False, "_is_path_in(%r, %r) should be False" % args
+
+    def test__true(self):
+        for args in [   (_p('/foo'), _p('/')),
+                        (_p('/foo/bar'), _p('/foo')),
+                        (_p('/foo/bar/geez'), _p('/foo/bar')),
+                        (_p('/foo//bar//geez'), _p('/foo/bar')),
+                        (_p('/foo/bar/geez'), _p('/foo//bar')),
+                        (_p('/foo/bar/geez'), _p('//foo//bar')) ]:
+            assert SCons.Platform.virtualenv._is_path_in(*args) is True, "_is_path_in(%r, %r) should be True" % args
+
+class IsInVirtualenvTestCase(unittest.TestCase):
+    def test_false(self):
+        # "without wirtualenv" - always false
+        with SysPrefixes(_p('/prefix')):
+            for p in [  _p(''),
+                        _p('/foo'),
+                        _p('/prefix'),
+                        _p('/prefix/foo') ]:
+                assert SCons.Platform.virtualenv.IsInVirtualenv(p) is False, "IsInVirtualenv(%r) should be False" % p
+
+        # "with virtualenv"
+        with SysPrefixes(_p('/virtualenv/prefix'), real_prefix=_p('/real/prefix')):
+            for p in [  _p(''),
+                        _p('/real/prefix/foo'),
+                        _p('/virtualenv/prefix'),
+                        _p('/virtualenv/prefix/bar/..'),
+                        _p('/virtualenv/prefix/bar/../../bleah'),
+                        _p('/virtualenv/bleah') ]:
+                assert SCons.Platform.virtualenv.IsInVirtualenv(p) is False, "IsInVirtualenv(%r) should be False" % p
+
+        # "with venv"
+        with SysPrefixes(_p('/virtualenv/prefix'), base_prefix=_p('/base/prefix')):
+            for p in [  _p(''),
+                        _p('/base/prefix/foo'),
+                        _p('/virtualenv/prefix'),
+                        _p('/virtualenv/prefix/bar/..'),
+                        _p('/virtualenv/prefix/bar/../../bleah'),
+                        _p('/virtualenv/bleah') ]:
+                assert SCons.Platform.virtualenv.IsInVirtualenv(p) is False, "IsInVirtualenv(%r) should be False" % p
+
+    def test_true(self):
+        # "with virtualenv"
+        with SysPrefixes(_p('/virtualenv/prefix'), real_prefix=_p('/real/prefix')):
+            for p in [  _p('/virtualenv/prefix/foo'),
+                        _p('/virtualenv/prefix/foo/bar') ]:
+                assert SCons.Platform.virtualenv.IsInVirtualenv(p) is True, "IsInVirtualenv(%r) should be True" % p
+
+        # "with venv"
+        with SysPrefixes(_p('/virtualenv/prefix'), base_prefix=_p('/base/prefix')):
+            for p in [  _p('/virtualenv/prefix/foo'),
+                        _p('/virtualenv/prefix/foo/bar') ]:
+                assert SCons.Platform.virtualenv.IsInVirtualenv(p) is True, "IsInVirtualenv(%r) should be True" % p
+
+class _inject_venv_pathTestCase(unittest.TestCase):
+    def path_list(self):
+        return [
+            _p('/virtualenv/prefix/bin'),
+            _p('/virtualenv/prefix'),
+            _p('/virtualenv/prefix/../bar'),
+            _p('/home/user/.local/bin'),
+            _p('/usr/bin'),
+            _p('/opt/bin')
+        ]
+    def test_with_path_string(self):
+        env = Environment()
+        path_string = os.path.pathsep.join(self.path_list())
+        with SysPrefixes(_p('/virtualenv/prefix'), real_prefix=_p('/real/prefix')):
+            SCons.Platform.virtualenv._inject_venv_path(env, path_string)
+            assert env['ENV']['PATH'] == _p('/virtualenv/prefix/bin'), env['ENV']['PATH']
+
+    def test_with_path_list(self):
+        env = Environment()
+        with SysPrefixes(_p('/virtualenv/prefix'), real_prefix=_p('/real/prefix')):
+            SCons.Platform.virtualenv._inject_venv_path(env, self.path_list())
+            assert env['ENV']['PATH'] == _p('/virtualenv/prefix/bin'), env['ENV']['PATH']
+
+class VirtualenvTestCase(unittest.TestCase):
+    def test_none(self):
+        def _msg(given):
+            return "Virtualenv() should be None, not %s" % repr(given)
+
+        with SysPrefixes(_p('/prefix')):
+            ve = SCons.Platform.virtualenv.Virtualenv()
+            assert ve is None , _msg(ve)
+        with SysPrefixes(_p('/base/prefix'), base_prefix=_p('/base/prefix')):
+            ve = SCons.Platform.virtualenv.Virtualenv()
+            assert ve is None, _msg(ve)
+
+    def test_not_none(self):
+        def _msg(expected, given):
+            return "Virtualenv() should == %r, not %s" % (_p(expected), repr(given))
+
+        with SysPrefixes(_p('/virtualenv/prefix'), real_prefix=_p('/real/prefix')):
+            ve = SCons.Platform.virtualenv.Virtualenv()
+            assert ve == _p('/virtualenv/prefix'), _msg('/virtualenv/prefix', ve)
+        with SysPrefixes(_p('/same/prefix'), real_prefix=_p('/same/prefix')):
+            ve = SCons.Platform.virtualenv.Virtualenv()
+            assert ve == _p('/same/prefix'),  _msg('/same/prefix', ve)
+        with SysPrefixes(_p('/virtualenv/prefix'), base_prefix=_p('/base/prefix')):
+            ve = SCons.Platform.virtualenv.Virtualenv()
+            assert ve == _p('/virtualenv/prefix'),  _msg('/virtualenv/prefix', ve)
+
+
+if __name__ == "__main__":
+    unittest.main()
+
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4:
diff --git a/src/engine/SCons/Platform/win32.py b/src/engine/SCons/Platform/win32.py
index 79955e7..f64081c 100644
--- a/src/engine/SCons/Platform/win32.py
+++ b/src/engine/SCons/Platform/win32.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Platform/win32.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Platform/win32.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
@@ -39,8 +39,14 @@ import tempfile
 
 from SCons.Platform.posix import exitvalmap
 from SCons.Platform import TempFileMunge
+from SCons.Platform.virtualenv import ImportVirtualenv
+from SCons.Platform.virtualenv import ignore_virtualenv, enable_virtualenv
 import SCons.Util
 
+CHOCO_DEFAULT_PATH = [
+    r'C:\ProgramData\chocolatey\bin'
+]
+
 try:
     import msvcrt
     import win32api
@@ -80,16 +86,8 @@ else:
                  win32con.HANDLE_FLAG_INHERIT, 0)
         file = _scons_file
     else:
-        import io
-        for io_class in ['BufferedReader', 'BufferedWriter', 'BufferedRWPair',
-                         'BufferedRandom', 'TextIOWrapper']:
-            _builtin_file = getattr(io, io_class)
-            class _scons_file(_builtin_file):
-                def __init__(self, *args, **kw):
-                    _builtin_file.__init__(self, *args, **kw)
-                    win32api.SetHandleInformation(msvcrt.get_osfhandle(self.fileno()),
-                        win32con.HANDLE_FLAG_INHERIT, 0)
-            setattr(io, io_class, _scons_file)
+        # No longer needed for python 3.4 and above. Files are opened non sharable
+        pass
 
 
 
@@ -132,7 +130,7 @@ try:
     # Without this, python can randomly crash while using -jN.
     # See the python bug at http://bugs.python.org/issue6476
     # and SCons issue at
-    # http://scons.tigris.org/issues/show_bug.cgi?id=2449
+    # https://github.com/SCons/scons/issues/2449
     def spawnve(mode, file, args, env):
         spawn_lock.acquire()
         try:
@@ -200,11 +198,11 @@ def piped_spawn(sh, escape, cmd, args, env, stdout, stderr):
         except OSError as e:
             # catch any error
             try:
-                ret = exitvalmap[e[0]]
+                ret = exitvalmap[e.errno]
             except KeyError:
-                sys.stderr.write("scons: unknown OSError exception code %d - %s: %s\n" % (e[0], cmd, e[1]))
+                sys.stderr.write("scons: unknown OSError exception code %d - %s: %s\n" % (e.errno, cmd, e.strerror))
             if stderr is not None:
-                stderr.write("scons: %s: %s\n" % (cmd, e[1]))
+                stderr.write("scons: %s: %s\n" % (cmd, e.strerror))
         # copy child output from tempfiles to our streams
         # and do clean up stuff
         if stdout is not None and stdoutRedirected == 0:
@@ -436,7 +434,7 @@ def generate(env):
         if v:
             env['ENV']['COMSPEC'] = v
 
-    env.AppendENVPath('PATH', get_system_root() + '\System32')
+    env.AppendENVPath('PATH', get_system_root() + '\\System32')
 
     env['ENV']['PATHEXT'] = '.COM;.EXE;.BAT;.CMD'
     env['OBJPREFIX']      = ''
@@ -462,6 +460,9 @@ def generate(env):
     env['HOST_OS']        = 'win32'
     env['HOST_ARCH']      = get_architecture().arch
 
+    if enable_virtualenv and not ignore_virtualenv:
+        ImportVirtualenv(env)
+
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Platform/win32.xml b/src/engine/SCons/Platform/win32.xml
index c2b9b01..cc87470 100644
--- a/src/engine/SCons/Platform/win32.xml
+++ b/src/engine/SCons/Platform/win32.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/SConf.py b/src/engine/SCons/SConf.py
index c1ab159..e0cd35d 100644
--- a/src/engine/SCons/SConf.py
+++ b/src/engine/SCons/SConf.py
@@ -12,7 +12,7 @@ libraries are installed, if some command line options are supported etc.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -35,7 +35,7 @@ libraries are installed, if some command line options are supported etc.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/SConf.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/SConf.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -56,6 +56,7 @@ import SCons.Warnings
 import SCons.Conftest
 
 from SCons.Debug import Trace
+from SCons.Node import DeciderNeedsNode
 
 # Turn off the Conftest error logging
 SCons.Conftest.LogInputFiles = 0
@@ -323,18 +324,6 @@ class SConfBuildTask(SCons.Taskmaster.AlwaysTask):
             s = sys.stdout = sys.stderr = Streamer(sys.stdout)
             try:
                 env = self.targets[0].get_build_env()
-                if cache_mode == FORCE:
-                    # Set up the Decider() to force rebuilds by saying
-                    # that every source has changed.  Note that we still
-                    # call the environment's underlying source decider so
-                    # that the correct .sconsign info will get calculated
-                    # and keep the build state consistent.
-                    def force_build(dependency, target, prev_ni,
-                                    env_decider=env.decide_source):
-                        env_decider(dependency, target, prev_ni)
-                        return True
-                    if env.decide_source.__code__ is not force_build.__code__:
-                        env.Decider(force_build)
                 env['PSTDOUT'] = env['PSTDERR'] = s
                 try:
                     sconf.cached = 0
@@ -405,12 +394,42 @@ class SConfBase(object):
         build tests in the VariantDir, not in the SourceDir)
         """
         global SConfFS
+
+        # Now create isolated override so setting source_decider doesn't affect parent Environment
+        if cache_mode == FORCE:
+            self.original_env = env
+            self.env = env.Clone()
+
+            # Set up the Decider() to force rebuilds by saying
+            # that every source has changed.  Note that we still
+            # call the environment's underlying source decider so
+            # that the correct .sconsign info will get calculated
+            # and keep the build state consistent.
+            def force_build(dependency, target, prev_ni,
+                            env_decider=env.decide_source,
+                            node=None):
+                try:
+                    env_decider(dependency, target, prev_ni)
+                except DeciderNeedsNode as e:
+                    e.decider(target, prev_ni, node=target)
+                except Exception as e:
+                    raise e
+                return True
+
+            if self.env.decide_source.__code__ is not force_build.__code__:
+                self.env.Decider(force_build)
+
+        else:
+            self.env = env
+
+        # print("Override env:%s"%env)
+
         if not SConfFS:
             SConfFS = SCons.Node.FS.default_fs or \
                       SCons.Node.FS.FS(env.fs.pathTop)
         if sconf_global is not None:
             raise SCons.Errors.UserError
-        self.env = env
+
         if log_file is not None:
             log_file = SConfFS.File(env.subst(log_file))
         self.logfile = log_file
@@ -449,6 +468,7 @@ class SConfBase(object):
                 env = sconf.Finish()
         """
         self._shutdown()
+
         return self.env
 
     def Define(self, name, value = None, comment = None):
@@ -503,6 +523,20 @@ class SConfBase(object):
                 n.attributes = SCons.Node.Node.Attrs()
             n.attributes.keep_targetinfo = 1
 
+            if True:
+                # Some checkers have intermediate files (for example anything that compiles a c file into a program to run
+                # Those files need to be set to not release their target info, otherwise taskmaster will throw a
+                # Nonetype not callable
+                for c in n.children(scan=False):
+                    # Keep debug code here.
+                    # print("Checking [%s] for builders and then setting keep_targetinfo"%c)
+                    if  c.has_builder():
+                        n.store_info = 0
+                        if not hasattr(c, 'attributes'):
+                            c.attributes = SCons.Node.Node.Attrs()
+                        c.attributes.keep_targetinfo = 1
+                    # pass
+
         ret = 1
 
         try:
@@ -609,7 +643,7 @@ class SConfBase(object):
         ok = self.TryBuild(self.env.SConfActionBuilder, text, extension)
         del self.env['BUILDERS']['SConfActionBuilder']
         if ok:
-            outputStr = self.lastTarget.get_contents().decode()
+            outputStr = self.lastTarget.get_text_contents()
             return (1, outputStr)
         return (0, "")
 
@@ -739,10 +773,18 @@ class SConfBase(object):
             self.logstream.write("\n")
             self.logstream.close()
             self.logstream = None
-        # remove the SConfSourceBuilder from the environment
-        blds = self.env['BUILDERS']
-        del blds['SConfSourceBuilder']
-        self.env.Replace( BUILDERS=blds )
+
+        # Now reset the decider if we changed it due to --config=force
+        # We saved original Environment passed in and cloned it to isolate
+        # it from being changed.
+        if cache_mode == FORCE:
+            self.env.Decider(self.original_env.decide_source)
+
+            # remove the SConfSourceBuilder from the environment
+            blds = self.env['BUILDERS']
+            del blds['SConfSourceBuilder']
+            self.env.Replace( BUILDERS=blds )
+
         self.active = 0
         sconf_global = None
         if not self.config_h is None:
@@ -1000,7 +1042,7 @@ def CheckLib(context, library = None, symbol = "main",
     compiles without flags.
     """
 
-    if library == []:
+    if not library:
         library = [None]
 
     if not SCons.Util.is_List(library):
diff --git a/src/engine/SCons/SConfTests.py b/src/engine/SCons/SConfTests.py
index 36abc7e..678147c 100644
--- a/src/engine/SCons/SConfTests.py
+++ b/src/engine/SCons/SConfTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/SConfTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/SConfTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -33,8 +33,6 @@ from types import *
 import unittest
 
 import TestCmd
-import TestUnit
-
 
 sys.stdout = io.StringIO()
 
@@ -115,9 +113,9 @@ class SConfTestCase(unittest.TestCase):
 
         def checks(self, sconf, TryFuncString):
             TryFunc = self.SConf.SConfBase.__dict__[TryFuncString]
-            res1 = TryFunc( sconf, "int main() { return 0; }\n", ".c" )
+            res1 = TryFunc( sconf, "int main(void) { return 0; }\n", ".c" )
             res2 = TryFunc( sconf,
-                            '#include "no_std_header.h"\nint main() {return 0; }\n',
+                            '#include "no_std_header.h"\nint main(void) {return 0; }\n',
                             '.c' )
             return (res1,res2)
 
@@ -196,7 +194,7 @@ class SConfTestCase(unittest.TestCase):
                         pass
                     def add_post_action(self, *actions):
                         pass
-                    def children(self):
+                    def children(self, scan = 1):
                         return []
                     def get_state(self):
                         return self.state
@@ -254,7 +252,7 @@ class SConfTestCase(unittest.TestCase):
         def checks(sconf):
             prog = """
 #include <stdio.h>
-int main() {
+int main(void) {
   printf( "Hello" );
   return 0;
 }
@@ -300,10 +298,17 @@ int main() {
         """Test SConf.TryAction
         """
         def actionOK(target, source, env):
-            open(str(target[0]), "w").write( "RUN OK\n" )
+            with open(str(target[0]), "w") as f:
+                f.write("RUN OK\n")
             return None
         def actionFAIL(target, source, env):
             return 1
+        def actionUnicode(target, source, env):
+            with open(str(target[0]), "wb") as f:
+                f.write('2\302\242\n')
+            return None
+
+
         self._resetSConfState()
         sconf = self.SConf.SConf(self.scons_env,
                                   conf_dir=self.test.workpath('config.tests'),
@@ -313,6 +318,12 @@ int main() {
             assert ret and output.encode('utf-8') == bytearray("RUN OK"+os.linesep,'utf-8'), (ret, output)
             (ret, output) = sconf.TryAction(action=actionFAIL)
             assert not ret and output == "", (ret, output)
+
+            if not TestCmd.IS_PY3:
+                # GH Issue #3141 - unicode text and py2.7 crashes.
+                (ret, output) = sconf.TryAction(action=actionUnicode)
+                assert ret and output == u'2\xa2\n', (ret, output)
+
         finally:
             sconf.Finish()
 
@@ -755,7 +766,7 @@ int main() {
             prog = """
 #include <stdio.h>
 
-int main() {
+int main(void) {
   printf( "Hello" );
   return 0;
 }
@@ -779,8 +790,7 @@ int main() {
 
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(SConfTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/SConsign.py b/src/engine/SCons/SConsign.py
index 9d2f69e..e01026d 100644
--- a/src/engine/SCons/SConsign.py
+++ b/src/engine/SCons/SConsign.py
@@ -5,7 +5,7 @@ Writing and reading information to the .sconsign file or files.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -29,7 +29,7 @@ Writing and reading information to the .sconsign file or files.
 
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/SConsign.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/SConsign.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -394,7 +394,8 @@ class DirFile(Dir):
                 # here, or in any of the following calls, would get
                 # raised, indicating something like a potentially
                 # serious disk or network issue.
-                open(self.sconsign, 'wb').write(open(fname, 'rb').read())
+                with open(self.sconsign, 'wb') as f, open(fname, 'rb') as f2:
+                    f.write(f2.read())
                 os.chmod(self.sconsign, mode)
         try:
             os.unlink(temp)
diff --git a/src/engine/SCons/SConsignTests.py b/src/engine/SCons/SConsignTests.py
index 37e0de9..e8e9231 100644
--- a/src/engine/SCons/SConsignTests.py
+++ b/src/engine/SCons/SConsignTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/SConsignTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/SConsignTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import sys
diff --git a/src/engine/SCons/Scanner/C.py b/src/engine/SCons/Scanner/C.py
index 6cdab4a..703ccc3 100644
--- a/src/engine/SCons/Scanner/C.py
+++ b/src/engine/SCons/Scanner/C.py
@@ -5,7 +5,7 @@ This module implements the dependency scanner for C/C++ code.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ This module implements the dependency scanner for C/C++ code.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/C.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/C.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Node.FS
 import SCons.Scanner
diff --git a/src/engine/SCons/Scanner/CTests.py b/src/engine/SCons/Scanner/CTests.py
index f7b2b16..d39f206 100644
--- a/src/engine/SCons/Scanner/CTests.py
+++ b/src/engine/SCons/Scanner/CTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/CTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/CTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -48,7 +48,7 @@ test.write('f1.cpp',"""
 #include \"f1.h\"
 #include <f2.h>
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -60,7 +60,7 @@ test.write('f2.cpp',"""
 #include \"f1.h\"
 #import <f4.h>
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -79,7 +79,7 @@ test.write('f3.cpp',"""
 
 const char* x = "#include <never.h>"
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -113,7 +113,7 @@ test.write('fa.cpp',"""
 #include \"fa.h\"
 #include <fb.h>
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -135,7 +135,7 @@ test.write(['work', 'src', 'fff.c'], """
 #include <iii.h>
 #include <jjj.h>
 
-int main()
+int main(void)
 {
     return 0;
 }
@@ -144,7 +144,7 @@ int main()
 test.write([ 'work', 'src', 'aaa.c'], """
 #include "bbb.h"
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -155,7 +155,7 @@ test.write([ 'work', 'src', 'bbb.h'], "\n")
 test.write([ 'repository', 'src', 'ccc.c'], """
 #include "ddd.h"
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -218,7 +218,7 @@ def deps_match(self, deps, headers):
     global my_normpath
     scanned = list(map(my_normpath, list(map(str, deps))))
     expect = list(map(my_normpath, headers))
-    self.failUnless(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
+    self.assertTrue(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
 
 # define some tests:
 
diff --git a/src/engine/SCons/Scanner/D.py b/src/engine/SCons/Scanner/D.py
index 3b6f2f9..2fc577c 100644
--- a/src/engine/SCons/Scanner/D.py
+++ b/src/engine/SCons/Scanner/D.py
@@ -8,7 +8,7 @@ Coded by Andy Friesen
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ Coded by Andy Friesen
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/D.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/D.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Scanner
 
diff --git a/src/engine/SCons/Scanner/DTests.py b/src/engine/SCons/Scanner/DTests.py
index 58fbe76..e649a88 100644
--- a/src/engine/SCons/Scanner/DTests.py
+++ b/src/engine/SCons/Scanner/DTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,12 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/DTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/DTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import unittest
 
 import TestCmd
-import TestUnit
 
 import SCons.Scanner.D
 
@@ -80,7 +79,7 @@ def deps_match(self, deps, headers):
     global my_normpath
     scanned = list(map(my_normpath, list(map(str, deps))))
     expect = list(map(my_normpath, headers))
-    self.failUnless(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
+    self.assertTrue(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
 
 """
 Examples from https://dlang.org/spec/module.html
@@ -266,14 +265,7 @@ class DScannerTestCase(unittest.TestCase):
         self.helper('multiline.d', ['A.d'])
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [
-        DScannerTestCase,
-    ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Scanner/Dir.py b/src/engine/SCons/Scanner/Dir.py
index 66d5b6d..ea4a351 100644
--- a/src/engine/SCons/Scanner/Dir.py
+++ b/src/engine/SCons/Scanner/Dir.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,7 +20,7 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Scanner/Dir.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/Dir.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Node.FS
 import SCons.Scanner
diff --git a/src/engine/SCons/Scanner/DirTests.py b/src/engine/SCons/Scanner/DirTests.py
index 12f1844..3ce0fa1 100644
--- a/src/engine/SCons/Scanner/DirTests.py
+++ b/src/engine/SCons/Scanner/DirTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,14 +21,13 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/DirTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/DirTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import sys
 import unittest
 
 import TestCmd
-import TestUnit
 
 import SCons.Node.FS
 import SCons.Scanner.Dir
@@ -121,14 +120,8 @@ class DirEntryScannerTestCase(DirScannerTestBase):
         sss = list(map(str, deps))
         assert sss == [], sss
 
-def suite():
-    suite = unittest.TestSuite()
-    suite.addTest(DirScannerTestCase())
-    suite.addTest(DirEntryScannerTestCase())
-    return suite
-
 if __name__ == "__main__":
-    TestUnit.run(suite())
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Scanner/Fortran.py b/src/engine/SCons/Scanner/Fortran.py
index 8a8f3eb..0431660 100644
--- a/src/engine/SCons/Scanner/Fortran.py
+++ b/src/engine/SCons/Scanner/Fortran.py
@@ -5,7 +5,7 @@ This module implements the dependency scanner for Fortran code.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,7 +26,7 @@ This module implements the dependency scanner for Fortran code.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Scanner/Fortran.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/Fortran.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import re
 
@@ -78,7 +78,7 @@ class F90Scanner(SCons.Scanner.Classic):
     def scan(self, node, env, path=()):
 
         # cache the includes list in node so we only scan it once:
-        if node.includes != None:
+        if node.includes is not None:
             mods_and_includes = node.includes
         else:
             # retrieve all included filenames
diff --git a/src/engine/SCons/Scanner/FortranTests.py b/src/engine/SCons/Scanner/FortranTests.py
index 4194018..08072aa 100644
--- a/src/engine/SCons/Scanner/FortranTests.py
+++ b/src/engine/SCons/Scanner/FortranTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/FortranTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/FortranTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
@@ -258,7 +258,7 @@ class DummyEnvironment(object):
 def deps_match(self, deps, headers):
     scanned = list(map(os.path.normpath, list(map(str, deps))))
     expect = list(map(os.path.normpath, headers))
-    self.failUnless(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
+    self.assertTrue(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
 
 # define some tests:
 
diff --git a/src/engine/SCons/Scanner/IDL.py b/src/engine/SCons/Scanner/IDL.py
index 706ff41..52bd1c5 100644
--- a/src/engine/SCons/Scanner/IDL.py
+++ b/src/engine/SCons/Scanner/IDL.py
@@ -6,7 +6,7 @@ Definition Language) files.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -28,7 +28,7 @@ Definition Language) files.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/IDL.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/IDL.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Node.FS
 import SCons.Scanner
diff --git a/src/engine/SCons/Scanner/IDLTests.py b/src/engine/SCons/Scanner/IDLTests.py
index f1b64c0..6ad35c5 100644
--- a/src/engine/SCons/Scanner/IDLTests.py
+++ b/src/engine/SCons/Scanner/IDLTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/IDLTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/IDLTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import unittest
 import sys
@@ -159,7 +159,7 @@ test.write(['work', 'src', 'fff.c'], """
 #include <iii.idl>
 #include <jjj.idl>
 
-int main()
+int main(void)
 {
     return 0;
 }
@@ -168,7 +168,7 @@ int main()
 test.write([ 'work', 'src', 'aaa.c'], """
 #include "bbb.idl"
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -179,7 +179,7 @@ test.write([ 'work', 'src', 'bbb.idl'], "\n")
 test.write([ 'repository', 'src', 'ccc.c'], """
 #include "ddd.idl"
 
-int main()
+int main(void)
 {
    return 0;
 }
@@ -243,7 +243,7 @@ if os.path.normcase('foo') == os.path.normcase('FOO'):
 def deps_match(self, deps, headers):
     scanned = list(map(my_normpath, list(map(str, deps))))
     expect = list(map(my_normpath, headers))
-    self.failUnless(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
+    self.assertTrue(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
 
 # define some tests:
 
diff --git a/src/engine/SCons/Scanner/LaTeX.py b/src/engine/SCons/Scanner/LaTeX.py
index 69154bd..0385ca0 100644
--- a/src/engine/SCons/Scanner/LaTeX.py
+++ b/src/engine/SCons/Scanner/LaTeX.py
@@ -5,7 +5,7 @@ This module implements the dependency scanner for LaTeX code.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ This module implements the dependency scanner for LaTeX code.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/LaTeX.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/LaTeX.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import re
@@ -128,8 +128,8 @@ class LaTeX(SCons.Scanner.Base):
     Unlike most scanners, which use regular expressions that just
     return the included file name, this returns a tuple consisting
     of the keyword for the inclusion ("include", "includegraphics",
-    "input", or "bibliography"), and then the file name itself.  
-    Based on a quick look at LaTeX documentation, it seems that we 
+    "input", or "bibliography"), and then the file name itself.
+    Based on a quick look at LaTeX documentation, it seems that we
     should append .tex suffix for the "include" keywords, append .tex if
     there is no extension for the "input" keyword, and need to add .bib
     for the "bibliography" keyword that does not accept extensions by itself.
@@ -137,7 +137,7 @@ class LaTeX(SCons.Scanner.Base):
     Finally, if there is no extension for an "includegraphics" keyword
     latex will append .ps or .eps to find the file, while pdftex may use .pdf,
     .jpg, .tif, .mps, or .png.
-    
+
     The actual subset and search order may be altered by
     DeclareGraphicsExtensions command. This complication is ignored.
     The default order corresponds to experimentation with teTeX::
@@ -333,7 +333,7 @@ class LaTeX(SCons.Scanner.Base):
         line_continues_a_comment = False
         for line in text.splitlines():
             line,comment = self.comment_re.findall(line)[0]
-            if line_continues_a_comment == True:
+            if line_continues_a_comment:
                 out[-1] = out[-1] + line.lstrip()
             else:
                 out.append(line)
@@ -349,7 +349,7 @@ class LaTeX(SCons.Scanner.Base):
         # path_dict = dict(list(path))
         # add option for whitespace (\s) before the '['
         noopt_cre = re.compile('\s*\[.*$')
-        if node.includes != None:
+        if node.includes is not None:
             includes = node.includes
         else:
             text = self.canonical_text(node.get_text_contents())
@@ -386,8 +386,8 @@ class LaTeX(SCons.Scanner.Base):
         directory of the main file just as latex does"""
 
         path_dict = dict(list(path))
-        
-        queue = [] 
+
+        queue = []
         queue.extend( self.scan(node) )
         seen = {}
 
@@ -402,7 +402,7 @@ class LaTeX(SCons.Scanner.Base):
         source_dir = node.get_dir()
         #for include in includes:
         while queue:
-            
+
             include = queue.pop()
             inc_type, inc_subdir, inc_filename = include
 
diff --git a/src/engine/SCons/Scanner/LaTeXTests.py b/src/engine/SCons/Scanner/LaTeXTests.py
index 93729d4..4f8ec16 100644
--- a/src/engine/SCons/Scanner/LaTeXTests.py
+++ b/src/engine/SCons/Scanner/LaTeXTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/LaTeXTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/LaTeXTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -31,14 +31,13 @@ import sys
 import unittest
 
 import TestCmd
-import TestUnit
 
 import SCons.Node.FS
 import SCons.Scanner.LaTeX
 
 test = TestCmd.TestCmd(workdir = '')
 
-test.write('test1.latex',"""
+test.write('test1.latex',r"""
 \include{inc1}
 \input{inc2}
 include{incNO}
@@ -52,12 +51,12 @@ xyzzy \include{inc6}
 \subinputfrom{subdir}{inc3e}
 """)
 
-test.write('test2.latex',"""
+test.write('test2.latex',r"""
 \include{inc1}
 \include{inc3}
 """)
 
-test.write('test3.latex',"""
+test.write('test3.latex',r"""
 \includegraphics{inc4.eps}
 \includegraphics[width=60mm]{inc5.xyz}
 """)
@@ -123,7 +122,7 @@ def deps_match(self, deps, headers):
     global my_normpath
     scanned = list(map(my_normpath, list(map(str, deps))))
     expect = list(map(my_normpath, headers))
-    self.failUnless(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
+    self.assertTrue(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
 
 
 class LaTeXScannerTestCase1(unittest.TestCase):
@@ -156,16 +155,8 @@ class LaTeXScannerTestCase3(unittest.TestCase):
          files = ['inc5.xyz', 'subdir/inc4.eps']
          deps_match(self, deps, files)
 
-
-def suite():
-    suite = unittest.TestSuite()
-    suite.addTest(LaTeXScannerTestCase1())
-    suite.addTest(LaTeXScannerTestCase2())
-    suite.addTest(LaTeXScannerTestCase3())
-    return suite
-
 if __name__ == "__main__":
-    TestUnit.run(suite())
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Scanner/Prog.py b/src/engine/SCons/Scanner/Prog.py
index 63d5a38..cabe6af 100644
--- a/src/engine/SCons/Scanner/Prog.py
+++ b/src/engine/SCons/Scanner/Prog.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/Prog.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/Prog.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Node
 import SCons.Node.FS
diff --git a/src/engine/SCons/Scanner/ProgTests.py b/src/engine/SCons/Scanner/ProgTests.py
index 1f4dfb5..619f844 100644
--- a/src/engine/SCons/Scanner/ProgTests.py
+++ b/src/engine/SCons/Scanner/ProgTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,14 +21,13 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/ProgTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/ProgTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import sys
 import unittest
 
 import TestCmd
-import TestUnit
 
 import SCons.Node.FS
 import SCons.Scanner.Prog
@@ -274,7 +273,7 @@ def suite():
     return suite
 
 if __name__ == "__main__":
-    TestUnit.run(suite())
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Scanner/RC.py b/src/engine/SCons/Scanner/RC.py
index 4202362..ccd7ebd 100644
--- a/src/engine/SCons/Scanner/RC.py
+++ b/src/engine/SCons/Scanner/RC.py
@@ -6,7 +6,7 @@ Definition Language) files.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -28,7 +28,7 @@ Definition Language) files.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/RC.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/RC.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import re
 
diff --git a/src/engine/SCons/Scanner/RCTests.py b/src/engine/SCons/Scanner/RCTests.py
index fa0a9b4..3012350 100644
--- a/src/engine/SCons/Scanner/RCTests.py
+++ b/src/engine/SCons/Scanner/RCTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/RCTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/RCTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import unittest
 import sys
@@ -29,7 +29,6 @@ import collections
 import os
 
 import TestCmd
-import TestUnit
 
 import SCons.Scanner.RC
 import SCons.Node.FS
@@ -117,7 +116,7 @@ if os.path.normcase('foo') == os.path.normcase('FOO'):
 def deps_match(self, deps, headers):
     scanned = sorted(map(my_normpath, list(map(str, deps))))
     expect = sorted(map(my_normpath, headers))
-    self.failUnless(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
+    self.assertTrue(scanned == expect, "expect %s != scanned %s" % (expect, scanned))
 
 # define some tests:
 
@@ -167,7 +166,7 @@ def suite():
     return suite
 
 if __name__ == "__main__":
-    TestUnit.run(suite())
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Scanner/SWIG.py b/src/engine/SCons/Scanner/SWIG.py
index 048574c..777474c 100644
--- a/src/engine/SCons/Scanner/SWIG.py
+++ b/src/engine/SCons/Scanner/SWIG.py
@@ -5,7 +5,7 @@ This module implements the dependency scanner for SWIG code.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ This module implements the dependency scanner for SWIG code.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/SWIG.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/SWIG.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Scanner
 
diff --git a/src/engine/SCons/Scanner/ScannerTests.py b/src/engine/SCons/Scanner/ScannerTests.py
index a962a4c..7e2720c 100644
--- a/src/engine/SCons/Scanner/ScannerTests.py
+++ b/src/engine/SCons/Scanner/ScannerTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,7 +20,7 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Scanner/ScannerTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/ScannerTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -132,16 +132,16 @@ class BaseTestCase(unittest.TestCase):
         scanned = scanner(filename, env, path)
         scanned_strs = [str(x) for x in scanned]
 
-        self.failUnless(self.filename == filename, "the filename was passed incorrectly")
-        self.failUnless(self.env == env, "the environment was passed incorrectly")
-        self.failUnless(scanned_strs == deps, "the dependencies were returned incorrectly")
+        self.assertTrue(self.filename == filename, "the filename was passed incorrectly")
+        self.assertTrue(self.env == env, "the environment was passed incorrectly")
+        self.assertTrue(scanned_strs == deps, "the dependencies were returned incorrectly")
         for d in scanned:
-            self.failUnless(not isinstance(d, str), "got a string in the dependencies")
+            self.assertTrue(not isinstance(d, str), "got a string in the dependencies")
 
         if len(args) > 0:
-            self.failUnless(self.arg == args[0], "the argument was passed incorrectly")
+            self.assertTrue(self.arg == args[0], "the argument was passed incorrectly")
         else:
-            self.failIf(hasattr(self, "arg"), "an argument was given when it shouldn't have been")
+            self.assertFalse(hasattr(self, "arg"), "an argument was given when it shouldn't have been")
 
     def test___call__dict(self):
         """Test calling Scanner.Base objects with a dictionary"""
@@ -245,7 +245,7 @@ class BaseTestCase(unittest.TestCase):
         dict[s] = 777
         i = hash(id(s))
         h = hash(list(dict.keys())[0])
-        self.failUnless(h == i,
+        self.assertTrue(h == i,
                         "hash Scanner base class expected %s, got %s" % (i, h))
 
     def test_scan_check(self):
@@ -260,7 +260,7 @@ class BaseTestCase(unittest.TestCase):
         self.checked = {}
         path = s.path(env)
         scanned = s(DummyNode('x'), env, path)
-        self.failUnless(self.checked['x'] == 1,
+        self.assertTrue(self.checked['x'] == 1,
                         "did not call check function")
 
     def test_recursive(self):
@@ -269,42 +269,42 @@ class BaseTestCase(unittest.TestCase):
 
         s = SCons.Scanner.Base(function = self.func)
         n = s.recurse_nodes(nodes)
-        self.failUnless(n == [],
+        self.assertTrue(n == [],
                         "default behavior returned nodes: %s" % n)
 
         s = SCons.Scanner.Base(function = self.func, recursive = None)
         n = s.recurse_nodes(nodes)
-        self.failUnless(n == [],
+        self.assertTrue(n == [],
                         "recursive = None returned nodes: %s" % n)
 
         s = SCons.Scanner.Base(function = self.func, recursive = 1)
         n = s.recurse_nodes(nodes)
-        self.failUnless(n == n,
+        self.assertTrue(n == n,
                         "recursive = 1 didn't return all nodes: %s" % n)
 
         def odd_only(nodes):
             return [n for n in nodes if n % 2]
         s = SCons.Scanner.Base(function = self.func, recursive = odd_only)
         n = s.recurse_nodes(nodes)
-        self.failUnless(n == [1, 3],
+        self.assertTrue(n == [1, 3],
                         "recursive = 1 didn't return all nodes: %s" % n)
 
     def test_get_skeys(self):
         """Test the Scanner.Base get_skeys() method"""
         s = SCons.Scanner.Base(function = self.func)
         sk = s.get_skeys()
-        self.failUnless(sk == [],
+        self.assertTrue(sk == [],
                         "did not initialize to expected []")
 
         s = SCons.Scanner.Base(function = self.func, skeys = ['.1', '.2'])
         sk = s.get_skeys()
-        self.failUnless(sk == ['.1', '.2'],
+        self.assertTrue(sk == ['.1', '.2'],
                         "sk was %s, not ['.1', '.2']")
 
         s = SCons.Scanner.Base(function = self.func, skeys = '$LIST')
         env = DummyEnvironment(LIST = ['.3', '.4'])
         sk = s.get_skeys(env)
-        self.failUnless(sk == ['.3', '.4'],
+        self.assertTrue(sk == ['.3', '.4'],
                         "sk was %s, not ['.3', '.4']")
 
     def test_select(self):
@@ -432,19 +432,19 @@ class CurrentTestCase(unittest.TestCase):
         path = s.path(env)
         hnb = HasNoBuilder()
         s(hnb, env, path)
-        self.failUnless(hnb.called_has_builder, "did not call has_builder()")
-        self.failUnless(not hnb.called_is_up_to_date, "did call is_up_to_date()")
-        self.failUnless(hnb.func_called, "did not call func()")
+        self.assertTrue(hnb.called_has_builder, "did not call has_builder()")
+        self.assertTrue(not hnb.called_is_up_to_date, "did call is_up_to_date()")
+        self.assertTrue(hnb.func_called, "did not call func()")
         inc = IsNotCurrent()
         s(inc, env, path)
-        self.failUnless(inc.called_has_builder, "did not call has_builder()")
-        self.failUnless(inc.called_is_up_to_date, "did not call is_up_to_date()")
-        self.failUnless(not inc.func_called, "did call func()")
+        self.assertTrue(inc.called_has_builder, "did not call has_builder()")
+        self.assertTrue(inc.called_is_up_to_date, "did not call is_up_to_date()")
+        self.assertTrue(not inc.func_called, "did call func()")
         ic = IsCurrent()
         s(ic, env, path)
-        self.failUnless(ic.called_has_builder, "did not call has_builder()")
-        self.failUnless(ic.called_is_up_to_date, "did not call is_up_to_date()")
-        self.failUnless(ic.func_called, "did not call func()")
+        self.assertTrue(ic.called_has_builder, "did not call has_builder()")
+        self.assertTrue(ic.called_is_up_to_date, "did not call is_up_to_date()")
+        self.assertTrue(ic.func_called, "did not call func()")
 
 class ClassicTestCase(unittest.TestCase):
 
@@ -461,7 +461,7 @@ class ClassicTestCase(unittest.TestCase):
     def test_find_include(self):
         """Test the Scanner.Classic find_include() method"""
         env = DummyEnvironment()
-        s = SCons.Scanner.Classic("t", ['.suf'], 'MYPATH', '^my_inc (\S+)')
+        s = SCons.Scanner.Classic("t", ['.suf'], 'MYPATH', r'^my_inc (\S+)')
 
         def _find_file(filename, paths):
             return paths[0]+'/'+filename
@@ -479,7 +479,7 @@ class ClassicTestCase(unittest.TestCase):
 
     def test_name(self):
         """Test setting the Scanner.Classic name"""
-        s = SCons.Scanner.Classic("my_name", ['.s'], 'MYPATH', '^my_inc (\S+)')
+        s = SCons.Scanner.Classic("my_name", ['.s'], 'MYPATH', r'^my_inc (\S+)')
         assert s.name == "my_name", s.name
 
     def test_scan(self):
@@ -505,7 +505,7 @@ class ClassicTestCase(unittest.TestCase):
                 return include, include
 
         env = DummyEnvironment()
-        s = MyScanner("t", ['.suf'], 'MYPATH', '^my_inc (\S+)')
+        s = MyScanner("t", ['.suf'], 'MYPATH', r'^my_inc (\S+)')
 
         # This set of tests is intended to test the scanning operation
         # of the Classic scanner.
@@ -566,7 +566,7 @@ class ClassicTestCase(unittest.TestCase):
 
         s = SCons.Scanner.Classic("Test", [], None, "", function=self.func, recursive=1)
         n = s.recurse_nodes(nodes)
-        self.failUnless(n == n,
+        self.assertTrue(n == n,
                         "recursive = 1 didn't return all nodes: %s" % n)
 
         def odd_only(nodes):
@@ -574,7 +574,7 @@ class ClassicTestCase(unittest.TestCase):
 
         s = SCons.Scanner.Classic("Test", [], None, "", function=self.func, recursive=odd_only)
         n = s.recurse_nodes(nodes)
-        self.failUnless(n == [1, 3],
+        self.assertTrue(n == [1, 3],
                         "recursive = 1 didn't return all nodes: %s" % n)
 
 
diff --git a/src/engine/SCons/Scanner/__init__.py b/src/engine/SCons/Scanner/__init__.py
index 73e8c09..693fae7 100644
--- a/src/engine/SCons/Scanner/__init__.py
+++ b/src/engine/SCons/Scanner/__init__.py
@@ -5,7 +5,7 @@ The Scanner package for the SCons software construction utility.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ The Scanner package for the SCons software construction utility.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Scanner/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Scanner/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import re
 
diff --git a/src/engine/SCons/Scanner/__init__.xml b/src/engine/SCons/Scanner/__init__.xml
index db2d14b..436d806 100644
--- a/src/engine/SCons/Scanner/__init__.xml
+++ b/src/engine/SCons/Scanner/__init__.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Script/Interactive.py b/src/engine/SCons/Script/Interactive.py
index dee770c..35e32c2 100644
--- a/src/engine/SCons/Script/Interactive.py
+++ b/src/engine/SCons/Script/Interactive.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Script/Interactive.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Script/Interactive.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """
 SCons interactive mode
diff --git a/src/engine/SCons/Script/Main.py b/src/engine/SCons/Script/Main.py
index 076c30b..0d626cb 100644
--- a/src/engine/SCons/Script/Main.py
+++ b/src/engine/SCons/Script/Main.py
@@ -17,7 +17,7 @@ unsupported_python_version = (2, 6, 0)
 deprecated_python_version = (2, 7, 0)
 
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -38,7 +38,7 @@ deprecated_python_version = (2, 7, 0)
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Script/Main.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Script/Main.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 import SCons.compat
@@ -48,6 +48,7 @@ import sys
 import time
 import traceback
 import sysconfig
+import platform
 
 import SCons.CacheDir
 import SCons.Debug
@@ -58,6 +59,7 @@ import SCons.Job
 import SCons.Node
 import SCons.Node.FS
 import SCons.Platform
+import SCons.Platform.virtualenv
 import SCons.SConf
 import SCons.Script
 import SCons.Taskmaster
@@ -622,7 +624,7 @@ def _SConstruct_exists(dirname='', repositories=[], filelist=None):
     current directory.
     """
     if not filelist:
-        filelist = ['SConstruct', 'Sconstruct', 'sconstruct']
+        filelist = ['SConstruct', 'Sconstruct', 'sconstruct', 'SConstruct.py', 'Sconstruct.py', 'sconstruct.py']
     for file in filelist:
         sfile = os.path.join(dirname, file)
         if os.path.isfile(sfile):
@@ -862,6 +864,13 @@ def _main(parser):
     for warning_type, message in delayed_warnings:
         SCons.Warnings.warn(warning_type, message)
 
+    if not SCons.Platform.virtualenv.virtualenv_enabled_by_default:
+        if options.enable_virtualenv:
+            SCons.Platform.virtualenv.enable_virtualenv = True
+
+    if options.ignore_virtualenv:
+        SCons.Platform.virtualenv.ignore_virtualenv = True
+
     if options.diskcheck:
         SCons.Node.FS.set_diskcheck(options.diskcheck)
 
@@ -1253,7 +1262,11 @@ def _build_targets(fs, options, targets, target_top):
     BuildTask.options = options
 
 
-    python_has_threads = sysconfig.get_config_var('WITH_THREAD')
+    is_pypy = platform.python_implementation() == 'PyPy'
+    # As of 3.7, python removed support for threadless platforms.
+    # See https://www.python.org/dev/peps/pep-0011/
+    is_37_or_later = sys.version_info >= (3, 7)
+    python_has_threads = sysconfig.get_config_var('WITH_THREAD') or is_pypy or is_37_or_later
     # to check if python configured with threads.
     global num_jobs
     num_jobs = options.num_jobs
@@ -1347,7 +1360,7 @@ def main():
         pass
     parts.append(version_string("engine", SCons))
     parts.append(path_string("engine", SCons))
-    parts.append("Copyright (c) 2001 - 2017 The SCons Foundation")
+    parts.append("Copyright (c) 2001 - 2019 The SCons Foundation")
     version = ''.join(parts)
 
     from . import SConsOptions
@@ -1363,7 +1376,7 @@ def main():
             revert_io()
     except SystemExit as s:
         if s:
-            exit_status = s
+            exit_status = s.code
     except KeyboardInterrupt:
         print("scons: Build interrupted.")
         sys.exit(2)
diff --git a/src/engine/SCons/Script/Main.xml b/src/engine/SCons/Script/Main.xml
index 73db83e..c1c4bde 100644
--- a/src/engine/SCons/Script/Main.xml
+++ b/src/engine/SCons/Script/Main.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Script/MainTests.py b/src/engine/SCons/Script/MainTests.py
index f5660b0..64d3e0f 100644
--- a/src/engine/SCons/Script/MainTests.py
+++ b/src/engine/SCons/Script/MainTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,12 +21,10 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Script/MainTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Script/MainTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Script.Main
 
@@ -41,12 +39,7 @@ import SCons.Script.Main
 # of private functionality.
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = []
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Script/SConsOptions.py b/src/engine/SCons/Script/SConsOptions.py
index 5515c7d..8f31fd8 100644
--- a/src/engine/SCons/Script/SConsOptions.py
+++ b/src/engine/SCons/Script/SConsOptions.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Script/SConsOptions.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Script/SConsOptions.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import optparse
 import re
@@ -38,6 +38,7 @@ except ImportError:
 _ = gettext
 
 import SCons.Node.FS
+import SCons.Platform.virtualenv
 import SCons.Warnings
 
 OptionValueError        = optparse.OptionValueError
@@ -706,6 +707,12 @@ def Parser(version):
                   action="callback", callback=opt_duplicate,
                   help=opt_duplicate_help)
 
+    if not SCons.Platform.virtualenv.virtualenv_enabled_by_default:
+        op.add_option('--enable-virtualenv',
+                     dest="enable_virtualenv",
+                     action="store_true",
+                     help="Import certain virtualenv variables to SCons")
+
     op.add_option('-f', '--file', '--makefile', '--sconstruct',
                   nargs=1, type="string",
                   dest="file", default=[],
@@ -733,6 +740,11 @@ def Parser(version):
                   help="Search DIR for imported Python modules.",
                   metavar="DIR")
 
+    op.add_option('--ignore-virtualenv',
+                 dest="ignore_virtualenv",
+                 action="store_true",
+                 help="Do not import virtualenv variables to SCons")
+
     op.add_option('--implicit-cache',
                   dest='implicit_cache', default=False,
                   action="store_true",
@@ -906,6 +918,7 @@ def Parser(version):
                   action="append",
                   help="Search REPOSITORY for source and target files.")
 
+
     # Options from Make and Cons classic that we do not yet support,
     # but which we may support someday and whose (potential) meanings
     # we don't want to change.  These all get a "the -X option is not
@@ -978,7 +991,6 @@ def Parser(version):
                   action="callback", callback=opt_not_yet,
                   # help="Warn when an undefined variable is referenced."
                   help=SUPPRESS_HELP)
-
     return op
 
 # Local Variables:
diff --git a/src/engine/SCons/Script/SConscript.py b/src/engine/SCons/Script/SConscript.py
index 350772e..ea239e0 100644
--- a/src/engine/SCons/Script/SConscript.py
+++ b/src/engine/SCons/Script/SConscript.py
@@ -5,10 +5,8 @@ files.
 
 """
 
-from __future__ import print_function
-
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -29,7 +27,7 @@ from __future__ import print_function
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Script/SConscript.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Script/SConscript.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons
 import SCons.Action
@@ -46,12 +44,15 @@ import SCons.Script.Main
 import SCons.Tool
 import SCons.Util
 
+from . import Main
+
 import collections
 import os
 import os.path
 import re
 import sys
 import traceback
+import time
 
 class SConscriptReturn(Exception):
     pass
@@ -152,6 +153,35 @@ def Return(*vars, **kw):
 
 stack_bottom = '% Stack boTTom %' # hard to define a variable w/this name :)
 
+def handle_missing_SConscript(f, must_exist=None):
+    """Take appropriate action on missing file in SConscript() call.
+
+    Print a warning or raise an exception on missing file.
+    On first warning, print a deprecation message.
+
+    Args:
+        f (str): path of missing configuration file
+        must_exist (bool): raise exception if file does not exist
+
+    Raises:
+        UserError if 'must_exist' is True or if global
+          SCons.Script._no_missing_sconscript is True.
+    """
+
+    if must_exist or (SCons.Script._no_missing_sconscript and must_exist is not False):
+        msg = "Fatal: missing SConscript '%s'" % f.get_internal_path()
+        raise SCons.Errors.UserError(msg)
+
+    if SCons.Script._warn_missing_sconscript_deprecated:
+        msg = "Calling missing SConscript without error is deprecated.\n" + \
+              "Transition by adding must_exist=0 to SConscript calls.\n" + \
+              "Missing SConscript '%s'" % f.get_internal_path()
+        SCons.Warnings.warn(SCons.Warnings.MissingSConscriptWarning, msg)
+        SCons.Script._warn_missing_sconscript_deprecated = False
+    else:
+        msg = "Ignoring missing SConscript '%s'" % f.get_internal_path()
+        SCons.Warnings.warn(SCons.Warnings.MissingSConscriptWarning, msg)
+
 def _SConscript(fs, *files, **kw):
     top = fs.Top
     sd = fs.SConstruct_dir.rdir()
@@ -248,17 +278,23 @@ def _SConscript(fs, *files, **kw):
                         pass
                     try:
                         try:
-#                            _file_ = SCons.Util.to_str(_file_)
-                            exec(compile(_file_.read(), _file_.name, 'exec'),
-                                 call_stack[-1].globals)
+                            if Main.print_time:
+                                time1 = time.time()
+                            scriptdata = _file_.read()
+                            scriptname = _file_.name
+                            _file_.close()
+                            exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
                         except SConscriptReturn:
                             pass
                     finally:
+                        if Main.print_time:
+                            time2 = time.time()
+                            print('SConscript:%s  took %0.3f ms' % (f.get_abspath(), (time2 - time1) * 1000.0))
+
                         if old_file is not None:
                             call_stack[-1].globals.update({__file__:old_file})
                 else:
-                    SCons.Warnings.warn(SCons.Warnings.MissingSConscriptWarning,
-                             "Ignoring missing SConscript '%s'" % f.get_internal_path())
+                    handle_missing_SConscript(f, kw.get('must_exist', None))
 
         finally:
             SCons.Script.sconscript_reading = SCons.Script.sconscript_reading - 1
@@ -362,9 +398,9 @@ class SConsEnvironment(SCons.Environment.Base):
         something like 3.2b1."""
         version = version_string.split(' ')[0].split('.')
         v_major = int(version[0])
-        v_minor = int(re.match('\d+', version[1]).group())
+        v_minor = int(re.match(r'\d+', version[1]).group())
         if len(version) >= 3:
-            v_revision = int(re.match('\d+', version[2]).group())
+            v_revision = int(re.match(r'\d+', version[2]).group())
         else:
             v_revision = 0
         return v_major, v_minor, v_revision
@@ -516,6 +552,31 @@ class SConsEnvironment(SCons.Environment.Base):
             raise SCons.Errors.UserError("Import of non-existent variable '%s'"%x)
 
     def SConscript(self, *ls, **kw):
+        """Execute SCons configuration files.
+
+        Parameters:
+            *ls (str or list): configuration file(s) to execute.
+
+        Keyword arguments:
+            dirs (list): execute SConscript in each listed directory.
+            name (str): execute script 'name' (used only with 'dirs').
+            exports (list or dict): locally export variables the
+              called script(s) can import.
+            variant_dir (str): mirror sources needed for the build in
+             a variant directory to allow building in it.
+            duplicate (bool): physically duplicate sources instead of just
+              adjusting paths of derived files (used only with 'variant_dir')
+              (default is True).
+            must_exist (bool): fail if a requested script is missing
+              (default is False, default is deprecated).
+
+        Returns:
+            list of variables returned by the called script
+
+        Raises:
+            UserError: a script is not found and such exceptions are enabled.
+        """
+
         if 'build_dir' in kw:
             msg = """The build_dir keyword has been deprecated; use the variant_dir keyword instead."""
             SCons.Warnings.warn(SCons.Warnings.DeprecatedBuildDirWarning, msg)
diff --git a/src/engine/SCons/Script/SConscript.xml b/src/engine/SCons/Script/SConscript.xml
index e6be6d2..2d77aa3 100644
--- a/src/engine/SCons/Script/SConscript.xml
+++ b/src/engine/SCons/Script/SConscript.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -38,6 +38,10 @@ Multiple calls to
 &f-Default;
 are legal,
 and add to the list of default targets.
+As noted above, both forms of this call affect the
+same global list of default targets; the
+construction environment method applies
+construction variable expansion to the targets.
 </para>
 
 <para>
@@ -357,12 +361,12 @@ Return('val1 val2')
 
 <scons_function name="SConscript">
 <arguments>
-(scripts, [exports, variant_dir, duplicate])
-<!-- (scripts, [exports, variant_dir, src_dir, duplicate]) -->
+(scripts, [exports, variant_dir, duplicate, must_exist])
+<!-- (scripts, [exports, variant_dir, src_dir, duplicate, must_exist]) -->
 </arguments>
 <arguments>
-(dirs=subdirs, [name=script, exports, variant_dir, duplicate])
-<!-- (dirs=subdirs, [name=script, exports, variant_dir, src_dir, duplicate]) -->
+(dirs=subdirs, [name=script, exports, variant_dir, duplicate, must_exist])
+<!-- (dirs=subdirs, [name=script, exports, variant_dir, src_dir, duplicate, must_exist]) -->
 </arguments>
 <summary>
 <para>
@@ -564,6 +568,17 @@ TODO??? SConscript('build/SConscript', src_dir='src')
 </para>
 
 <para>
+The optional
+<varname>must_exist</varname>
+argument, if true, causes an exception to be raised if a requested
+&SConscript; file is not found. The current default is false,
+causing only a warning to be omitted, but this behavior is deprecated.
+For scripts which truly intend to be optional, transition to
+explicty supplying
+<literal>must_exist=False</literal> to the call.
+</para>
+
+<para>
 Here are some composite examples:
 </para>
 
diff --git a/src/engine/SCons/Script/SConscriptTests.py b/src/engine/SCons/Script/SConscriptTests.py
index 2b10446..fb06ac4 100644
--- a/src/engine/SCons/Script/SConscriptTests.py
+++ b/src/engine/SCons/Script/SConscriptTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Script/SConscriptTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Script/SConscriptTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Script.SConscript
 
diff --git a/src/engine/SCons/Script/__init__.py b/src/engine/SCons/Script/__init__.py
index ffafadf..834c70d 100644
--- a/src/engine/SCons/Script/__init__.py
+++ b/src/engine/SCons/Script/__init__.py
@@ -12,7 +12,7 @@ it goes here.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -34,7 +34,7 @@ it goes here.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Script/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Script/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import time
 start_time = time.time()
@@ -81,8 +81,8 @@ import SCons.Action
 import SCons.Builder
 import SCons.Environment
 import SCons.Node.FS
-import SCons.Options
 import SCons.Platform
+import SCons.Platform.virtualenv
 import SCons.Scanner
 import SCons.SConf
 import SCons.Subst
@@ -150,6 +150,7 @@ Environment             = SCons.Environment.Environment
 #OptParser               = SCons.SConsOptions.OptParser
 FindPathDirs            = SCons.Scanner.FindPathDirs
 Platform                = SCons.Platform.Platform
+Virtualenv              = SCons.Platform.virtualenv.Virtualenv
 Return                  = _SConscript.Return
 Scanner                 = SCons.Scanner.Base
 Tool                    = SCons.Tool.Tool
@@ -162,12 +163,6 @@ ListVariable            = SCons.Variables.ListVariable
 PackageVariable         = SCons.Variables.PackageVariable
 PathVariable            = SCons.Variables.PathVariable
 
-# Deprecated names that will go away some day.
-BoolOption              = SCons.Options.BoolOption
-EnumOption              = SCons.Options.EnumOption
-ListOption              = SCons.Options.ListOption
-PackageOption           = SCons.Options.PackageOption
-PathOption              = SCons.Options.PathOption
 
 # Action factories.
 Chmod                   = SCons.Defaults.Chmod
@@ -283,12 +278,20 @@ def HelpFunction(text, append=False):
 # Will be non-zero if we are reading an SConscript file.
 sconscript_reading = 0
 
+_no_missing_sconscript = False
+_warn_missing_sconscript_deprecated = True
+
+def set_missing_sconscript_error(flag=1):
+    """Set behavior on missing file in SConscript() call. Returns previous value"""
+    global _no_missing_sconscript
+    old = _no_missing_sconscript
+    _no_missing_sconscript = flag
+    return old
+
 #
 def Variables(files=[], args=ARGUMENTS):
     return SCons.Variables.Variables(files, args)
 
-def Options(files=[], args=ARGUMENTS):
-    return SCons.Options.Options(files, args)
 
 # The list of global functions to add to the SConscript name space
 # that end up calling corresponding methods or Builders in the
@@ -374,7 +377,9 @@ GlobalDefaultBuilders = [
     'SharedObject',
     'StaticLibrary',
     'StaticObject',
+    'Substfile',
     'Tar',
+    'Textfile',
     'TypeLibrary',
     'Zip',
     'Package',
diff --git a/src/engine/SCons/Subst.py b/src/engine/SCons/Subst.py
index 90c12a0..4fc8461 100644
--- a/src/engine/SCons/Subst.py
+++ b/src/engine/SCons/Subst.py
@@ -5,7 +5,7 @@ SCons string substitution.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,7 +26,7 @@ SCons string substitution.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Subst.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Subst.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import collections
 import re
@@ -86,6 +86,9 @@ class Literal(object):
     def __neq__(self, other):
         return not self.__eq__(other)
 
+    def __hash__(self):
+        return hash(self.lstr)
+
 class SpecialAttrWrapper(object):
     """This is a wrapper for what we call a 'Node special attribute.'
     This is any of the attributes of a Node that we can reference from
@@ -338,7 +341,10 @@ SUBST_RAW = 1
 SUBST_SIG = 2
 
 _rm = re.compile(r'\$[()]')
-_rm_split = re.compile(r'(\$[()])')
+
+# Note the pattern below only matches $( or $) when there is no
+# preceeding $. (Thus the (?<!\$))
+_rm_split = re.compile(r'(?<!\$)(\$[()])')
 
 # Indexed by the SUBST_* constants above.
 _regex_remove = [ _rm, None, _rm_split ]
@@ -437,7 +443,11 @@ def scons_subst(strSubst, env, mode=SUBST_RAW, target=None, source=None, gvars={
                 if s0 != '$':
                     return s
                 if s1 == '$':
-                    return '$'
+                    # In this case keep the double $'s which we'll later
+                    # swap for a single dollar sign as we need to retain
+                    # this information to properly avoid matching "$("" when
+                    # the actual text was "$$(""  (or "$)"" when "$$)"" )
+                    return '$$'
                 elif s1 in '()':
                     return s
                 else:
@@ -583,6 +593,12 @@ def scons_subst(strSubst, env, mode=SUBST_RAW, target=None, source=None, gvars={
             # Compress strings of white space characters into
             # a single space.
             result = _space_sep.sub(' ', result).strip()
+
+        # Now replace escaped $'s currently "$$"
+        # This is needed because we now retain $$ instead of
+        # replacing them during substition to avoid
+        # improperly trying to escape "$$(" as being "$("
+        result = result.replace('$$','$')
     elif is_Sequence(result):
         remove = _list_remove[mode]
         if remove:
diff --git a/src/engine/SCons/Subst.xml b/src/engine/SCons/Subst.xml
index a75003f..858ff40 100644
--- a/src/engine/SCons/Subst.xml
+++ b/src/engine/SCons/Subst.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/SubstTests.py b/src/engine/SCons/SubstTests.py
index 5a85b6c..0da1faf 100644
--- a/src/engine/SCons/SubstTests.py
+++ b/src/engine/SCons/SubstTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -22,7 +22,7 @@
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/SubstTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/SubstTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -32,8 +32,6 @@ import unittest
 
 from collections import UserDict
 
-import TestUnit
-
 import SCons.Errors
 
 from SCons.Subst import *
@@ -336,6 +334,10 @@ class scons_subst_TestCase(SubstTestCase):
         # Test double-dollar-sign behavior.
         "$$FFF$HHH",            "$FFFIII",
 
+        # Test double-dollar-sign before open paren. It's not meant
+        # to be signature escaping
+        'echo $$(pwd) > XYZ',   'echo $(pwd) > XYZ',
+
         # Test that a Literal will stop dollar-sign substitution.
         "$XXX $LITERAL $FFF",   "GGG $XXX GGG",
 
@@ -1239,21 +1241,7 @@ class subst_dict_TestCase(unittest.TestCase):
         assert SOURCES == ['s3', 'v-rstr-s4', 'v-s5'], SOURCES
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [
-        CLVar_TestCase,
-        LiteralTestCase,
-        SpecialAttrWrapperTestCase,
-        quote_spaces_TestCase,
-        scons_subst_TestCase,
-        scons_subst_list_TestCase,
-        scons_subst_once_TestCase,
-        subst_dict_TestCase,
-    ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Taskmaster.py b/src/engine/SCons/Taskmaster.py
index 8fca4a9..d8d8224 100644
--- a/src/engine/SCons/Taskmaster.py
+++ b/src/engine/SCons/Taskmaster.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -54,7 +54,7 @@ __doc__ = """
         target(s) that it decides need to be evaluated and/or built.
 """
 
-__revision__ = "src/engine/SCons/Taskmaster.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Taskmaster.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from itertools import chain
 import operator
@@ -470,14 +470,23 @@ class Task(object):
                 pending_children.discard(t)
             for p in t.waiting_parents:
                 parents[p] = parents.get(p, 0) + 1
+            t.waiting_parents = set()
 
         for t in targets:
             if t.side_effects is not None:
                 for s in t.side_effects:
                     if s.get_state() == NODE_EXECUTING:
                         s.set_state(NODE_NO_STATE)
+                        
+                    # The side-effects may have been transferred to
+                    # NODE_NO_STATE by executed_with{,out}_callbacks, but was
+                    # not taken out of the waiting parents/pending children
+                    # data structures. Check for that now.
+                    if s.get_state() == NODE_NO_STATE and s.waiting_parents:
+                        pending_children.discard(s)
                         for p in s.waiting_parents:
                             parents[p] = parents.get(p, 0) + 1
+                        s.waiting_parents = set()
                     for p in s.waiting_s_e:
                         if p.ref_count == 0:
                             self.tm.candidates.append(p)
diff --git a/src/engine/SCons/TaskmasterTests.py b/src/engine/SCons/TaskmasterTests.py
index fab54cf..d31a8d5 100644
--- a/src/engine/SCons/TaskmasterTests.py
+++ b/src/engine/SCons/TaskmasterTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -22,7 +22,7 @@
 #
 from __future__ import division
 
-__revision__ = "src/engine/SCons/TaskmasterTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/TaskmasterTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -30,7 +30,6 @@ import copy
 import sys
 import unittest
 
-import TestUnit
 
 import SCons.Taskmaster
 import SCons.Errors
@@ -1086,6 +1085,7 @@ class TaskmasterTestCase(unittest.TestCase):
         exception_values = [
             "integer division or modulo",
             "integer division or modulo by zero",
+            "integer division by zero",    # PyPy2
         ]
         assert str(exc_value) in exception_values, exc_value
 
@@ -1239,8 +1239,7 @@ Taskmaster: No candidate anymore.
 
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(TaskmasterTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/386asm.py b/src/engine/SCons/Tool/386asm.py
index b318c4b..930b431 100644
--- a/src/engine/SCons/Tool/386asm.py
+++ b/src/engine/SCons/Tool/386asm.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/386asm.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/386asm.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Tool.PharLapCommon import addPharLapPaths
 import SCons.Util
diff --git a/src/engine/SCons/Tool/386asm.xml b/src/engine/SCons/Tool/386asm.xml
index 80a2cd6..fe819d2 100644
--- a/src/engine/SCons/Tool/386asm.xml
+++ b/src/engine/SCons/Tool/386asm.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/DCommon.py b/src/engine/SCons/Tool/DCommon.py
index 8973853..169f95d 100644
--- a/src/engine/SCons/Tool/DCommon.py
+++ b/src/engine/SCons/Tool/DCommon.py
@@ -9,7 +9,7 @@ Coded by Russel Winder (russel@winder.org.uk)
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ Coded by Russel Winder (russel@winder.org.uk)
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/DCommon.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/DCommon.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
diff --git a/src/engine/SCons/Tool/DCommon.xml b/src/engine/SCons/Tool/DCommon.xml
index b1deb82..5103ca1 100644
--- a/src/engine/SCons/Tool/DCommon.xml
+++ b/src/engine/SCons/Tool/DCommon.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/FortranCommon.py b/src/engine/SCons/Tool/FortranCommon.py
index d2126a4..27646f0 100644
--- a/src/engine/SCons/Tool/FortranCommon.py
+++ b/src/engine/SCons/Tool/FortranCommon.py
@@ -5,7 +5,7 @@ Stuff for processing Fortran, common to all fortran dialects.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -28,7 +28,7 @@ Stuff for processing Fortran, common to all fortran dialects.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/FortranCommon.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/FortranCommon.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import re
 import os.path
diff --git a/src/engine/SCons/Tool/GettextCommon.py b/src/engine/SCons/Tool/GettextCommon.py
index b475d8f..8c2163e 100644
--- a/src/engine/SCons/Tool/GettextCommon.py
+++ b/src/engine/SCons/Tool/GettextCommon.py
@@ -3,7 +3,7 @@
 Used by several tools of `gettext` toolset.
 """
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -24,7 +24,7 @@ Used by several tools of `gettext` toolset.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/GettextCommon.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/GettextCommon.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Warnings
 import re
@@ -390,7 +390,7 @@ def _detect_xgettext(env):
     """ Detects *xgettext(1)* binary """
     if 'XGETTEXT' in env:
         return env['XGETTEXT']
-    xgettext = env.Detect('xgettext');
+    xgettext = env.Detect('xgettext')
     if xgettext:
         return xgettext
     raise SCons.Errors.StopError(XgettextNotFound, "Could not detect xgettext")
@@ -409,7 +409,7 @@ def _detect_msginit(env):
     """ Detects *msginit(1)* program. """
     if 'MSGINIT' in env:
         return env['MSGINIT']
-    msginit = env.Detect('msginit');
+    msginit = env.Detect('msginit')
     if msginit:
         return msginit
     raise SCons.Errors.StopError(MsginitNotFound, "Could not detect msginit")
@@ -428,7 +428,7 @@ def _detect_msgmerge(env):
     """ Detects *msgmerge(1)* program. """
     if 'MSGMERGE' in env:
         return env['MSGMERGE']
-    msgmerge = env.Detect('msgmerge');
+    msgmerge = env.Detect('msgmerge')
     if msgmerge:
         return msgmerge
     raise SCons.Errors.StopError(MsgmergeNotFound, "Could not detect msgmerge")
@@ -447,7 +447,7 @@ def _detect_msgfmt(env):
     """ Detects *msgmfmt(1)* program. """
     if 'MSGFMT' in env:
         return env['MSGFMT']
-    msgfmt = env.Detect('msgfmt');
+    msgfmt = env.Detect('msgfmt')
     if msgfmt:
         return msgfmt
     raise SCons.Errors.StopError(MsgfmtNotFound, "Could not detect msgfmt")
diff --git a/src/engine/SCons/Tool/JavaCommon.py b/src/engine/SCons/Tool/JavaCommon.py
index 5c2507d..2683f03 100644
--- a/src/engine/SCons/Tool/JavaCommon.py
+++ b/src/engine/SCons/Tool/JavaCommon.py
@@ -5,7 +5,7 @@ Stuff for processing Java.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,16 +27,21 @@ Stuff for processing Java.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/JavaCommon.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/JavaCommon.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
 import re
+import glob
 
 java_parsing = 1
 
 default_java_version = '1.4'
 
+# a switch for which jdk versions to use the Scope state for smarter
+# anonymous inner class parsing.
+scopeStateVersions = ('1.8')
+
 if java_parsing:
     # Parse Java files for class names.
     #
@@ -64,8 +69,9 @@ if java_parsing:
         interfaces, and anonymous inner classes."""
         def __init__(self, version=default_java_version):
 
-            if not version in ('1.1', '1.2', '1.3','1.4', '1.5', '1.6', '1.7',
-                               '1.8', '5', '6'):
+            if not version in ('1.1', '1.2', '1.3', '1.4', '1.5', '1.6', '1.7',
+                               '1.8', '5', '6', '9.0', '10.0', '11.0'):
+
                 msg = "Java version %s not supported" % version
                 raise NotImplementedError(msg)
 
@@ -115,8 +121,8 @@ if java_parsing:
                 ret = SkipState(1, self)
                 self.skipState = ret
                 return ret
-        
-        def __getAnonStack(self):
+
+        def _getAnonStack(self):
             return self.anonStacksStack[-1]
 
         def openBracket(self):
@@ -125,15 +131,16 @@ if java_parsing:
         def closeBracket(self):
             self.brackets = self.brackets - 1
             if len(self.stackBrackets) and \
-               self.brackets == self.stackBrackets[-1]:
+                            self.brackets == self.stackBrackets[-1]:
                 self.listOutputs.append('$'.join(self.listClasses))
                 self.localClasses.pop()
                 self.listClasses.pop()
                 self.anonStacksStack.pop()
                 self.stackBrackets.pop()
             if len(self.stackAnonClassBrackets) and \
-               self.brackets == self.stackAnonClassBrackets[-1]:
-                self.__getAnonStack().pop()
+                            self.brackets == self.stackAnonClassBrackets[-1] and \
+                            self.version not in scopeStateVersions:
+                self._getAnonStack().pop()
                 self.stackAnonClassBrackets.pop()
 
         def parseToken(self, token):
@@ -171,21 +178,87 @@ if java_parsing:
             if self.version in ('1.1', '1.2', '1.3', '1.4'):
                 clazz = self.listClasses[0]
                 self.listOutputs.append('%s$%d' % (clazz, self.nextAnon))
-            elif self.version in ('1.5', '1.6', '1.7', '1.8', '5', '6'):
+            elif self.version in ('1.5', '1.6', '1.7', '1.8', '5', '6', '9.0', '10.0', '11.0'):
                 self.stackAnonClassBrackets.append(self.brackets)
                 className = []
                 className.extend(self.listClasses)
-                self.__getAnonStack()[-1] = self.__getAnonStack()[-1] + 1
-                for anon in self.__getAnonStack():
+                self._getAnonStack()[-1] = self._getAnonStack()[-1] + 1
+                for anon in self._getAnonStack():
                     className.append(str(anon))
                 self.listOutputs.append('$'.join(className))
 
             self.nextAnon = self.nextAnon + 1
-            self.__getAnonStack().append(0)
+            self._getAnonStack().append(0)
 
         def setPackage(self, package):
             self.package = package
 
+    class ScopeState(object):
+        """
+        A state that parses code within a scope normally,
+        within the confines of a scope.
+        """
+        def __init__(self, old_state):
+            self.outer_state = old_state.outer_state
+            self.old_state = old_state
+            self.brackets = 0
+
+        def __getClassState(self):
+            try:
+                return self.classState
+            except AttributeError:
+                ret = ClassState(self)
+                self.classState = ret
+                return ret
+
+        def __getAnonClassState(self):
+            try:
+                return self.anonState
+            except AttributeError:
+                ret = SkipState(1, AnonClassState(self))
+                self.anonState = ret
+                return ret
+
+        def __getSkipState(self):
+            try:
+                return self.skipState
+            except AttributeError:
+                ret = SkipState(1, self)
+                self.skipState = ret
+                return ret
+
+        def openBracket(self):
+            self.brackets = self.brackets + 1
+
+        def closeBracket(self):
+            self.brackets = self.brackets - 1
+
+        def parseToken(self, token):
+            # if self.brackets == 0:
+            #     return self.old_state.parseToken(token)
+            if token[:2] == '//':
+                return IgnoreState('\n', self)
+            elif token == '/*':
+                return IgnoreState('*/', self)
+            elif token == '{':
+                self.openBracket()
+            elif token == '}':
+                self.closeBracket()
+                if self.brackets == 0:
+                    self.outer_state._getAnonStack().pop()
+                    return self.old_state
+            elif token in ['"', "'"]:
+                return IgnoreState(token, self)
+            elif token == "new":
+                # anonymous inner class
+                return self.__getAnonClassState()
+            elif token == '.':
+                # Skip the attribute, it might be named "class", in which
+                # case we don't want to treat the following token as
+                # an inner class name...
+                return self.__getSkipState()
+            return self
+
     class AnonClassState(object):
         """A state that looks for anonymous inner classes."""
         def __init__(self, old_state):
@@ -212,13 +285,15 @@ if java_parsing:
                 if token == 'new':
                     # look further for anonymous inner class
                     return SkipState(1, AnonClassState(self))
-                elif token in [ '"', "'" ]:
+                elif token in ['"', "'"]:
                     return IgnoreState(token, self)
                 elif token == ')':
                     self.brace_level = self.brace_level - 1
                 return self
             if token == '{':
                 self.outer_state.addAnonClass()
+                if self.outer_state.version in scopeStateVersions:
+                    return ScopeState(old_state = self.old_state).parseToken(token)
             return self.old_state.parseToken(token)
 
     class SkipState(object):
@@ -245,10 +320,10 @@ if java_parsing:
             # If that's an inner class which is declared in a method, it
             # requires an index prepended to the class-name, e.g.
             # 'Foo$1Inner'
-            # http://scons.tigris.org/issues/show_bug.cgi?id=2087
+            # https://github.com/SCons/scons/issues/2087
             if self.outer_state.localClasses and \
-                self.outer_state.stackBrackets[-1] > \
-                self.outer_state.stackBrackets[-2]+1:
+                            self.outer_state.stackBrackets[-1] > \
+                                    self.outer_state.stackBrackets[-2]+1:
                 locals = self.outer_state.localClasses[-1]
                 try:
                     idx = locals[token]
@@ -283,7 +358,9 @@ if java_parsing:
             return self.outer_state
 
     def parse_java_file(fn, version=default_java_version):
-        return parse_java(open(fn, 'r').read(), version)
+        with open(fn, 'r') as f:
+            data = f.read()
+        return parse_java(data, version)
 
     def parse_java(contents, version=default_java_version, trace=None):
         """Parse a .java file and return a double of package directory,
@@ -315,7 +392,84 @@ else:
         is that the file name matches the public class name, and that
         the path to the file is the same as the package name.
         """
-        return os.path.split(file)
+        return os.path.split(fn)
+
+
+
+java_win32_version_dir_glob = 'C:/Program Files*/Java/jdk%s*/bin'
+java_win32_dir_glob = 'C:/Program Files*/Java/jdk*/bin'
+
+java_macos_include_dir = '/System/Library/Frameworks/JavaVM.framework/Headers/'
+java_macos_version_include_dir = '/System/Library/Frameworks/JavaVM.framework/Versions/%s*/Headers/'
+
+java_linux_include_dirs = ['/usr/lib/jvm/default-java/include',
+                        '/usr/lib/jvm/java-*/include']
+# Need to match path like below (from Centos 7)
+# /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el7_5.x86_64/include/
+java_linux_version_include_dirs = ['/usr/lib/jvm/java-*-sun-%s*/include',
+                                   '/usr/lib/jvm/java-%s*-openjdk*/include',
+                                   '/usr/java/jdk%s*/include']
+
+
+
+def get_java_install_dirs(platform, version=None):
+    """
+    Using patterns above find the java jdk install dir
+    :param platform:
+    :param version: If specified, only look for java sdk's of this version
+    :return: list of default paths for java.
+    """
+    paths = []
+    if platform == 'win32':
+        if version:
+            paths = glob.glob(java_win32_version_dir_glob%version)
+        else:
+            paths = glob.glob(java_win32_dir_glob)
+    else:
+        # do nothing for now
+        pass
+
+    paths=sorted(paths)
+
+    return paths
+
+def get_java_include_paths(env, javac, version):
+    """
+    Return java include paths
+    :param platform:
+    :param javac:
+    :return:
+    """
+    paths = []
+    if not javac:
+        # there are no paths if we've not detected javac.
+        pass
+    elif env['PLATFORM'] == 'win32':
+        javac_bin_dir = os.path.dirname(javac)
+        java_inc_dir = os.path.normpath(os.path.join(javac_bin_dir, '..', 'include'))
+        paths = [java_inc_dir, os.path.join(java_inc_dir, 'win32')]
+    elif env['PLATFORM'] == 'darwin':
+        if not version:
+            paths = [java_macos_include_dir]
+        else:
+            paths = sorted(glob.glob(java_macos_version_include_dir%version))
+    else:
+        base_paths=[]
+        if not version:
+            for p in java_linux_include_dirs:
+                base_paths.extend(glob.glob(p))
+        else:
+            for p in java_linux_version_include_dirs:
+                base_paths.extend(glob.glob(p%version))
+
+        for p in base_paths:
+            paths.extend([p, os.path.join(p,'linux')])
+            
+    #print("PATHS:%s"%paths)
+    return paths
+
+
+
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/JavaCommonTests.py b/src/engine/SCons/Tool/JavaCommonTests.py
index da405f0..c70e445 100644
--- a/src/engine/SCons/Tool/JavaCommonTests.py
+++ b/src/engine/SCons/Tool/JavaCommonTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,14 +21,12 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/JavaCommonTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/JavaCommonTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Scanner.IDL
 import SCons.Tool.JavaCommon
 
@@ -566,14 +564,52 @@ public class Foo
         assert expect == classes, (expect, classes)
 
 
+    def test_in_function_class_declaration(self):
+        """
+        Test that implementing a class in a function call doesn't confuse SCons.
+        """
+
+        input = """
+package com.Matthew;
+
+public class AnonDemo {
+
+    public static void main(String[] args) {
+        new AnonDemo().execute();
+    }
+
+    public void execute() {
+        Foo bar = new Foo(new Foo() {
+            @Override
+            public int getX() { return this.x; }
+        }) {
+            @Override
+            public int getX() { return this.x; }
+        };
+    }
+
+    public abstract class Foo {
+        public int x;
+        public abstract int getX();
+
+        public Foo(Foo f) {
+            this.x = f.x;
+        }
+
+        public Foo() {}
+    }
+}
+"""
+        expect = ['AnonDemo$1',
+                  'AnonDemo$2',
+                  'AnonDemo$Foo',
+                  'AnonDemo']
+        pkg_dir, classes = SCons.Tool.JavaCommon.parse_java(input, '1.8')
+        assert expect == classes, (expect, classes)
+
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [ parse_javaTestCase ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/MSCommon/__init__.py b/src/engine/SCons/Tool/MSCommon/__init__.py
index 989ab08..7faff33 100644
--- a/src/engine/SCons/Tool/MSCommon/__init__.py
+++ b/src/engine/SCons/Tool/MSCommon/__init__.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/MSCommon/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """
 Common functions for Microsoft Visual Studio and Visual C/C++.
diff --git a/src/engine/SCons/Tool/MSCommon/arch.py b/src/engine/SCons/Tool/MSCommon/arch.py
index 96f05a8..6965fbf 100644
--- a/src/engine/SCons/Tool/MSCommon/arch.py
+++ b/src/engine/SCons/Tool/MSCommon/arch.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/arch.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/MSCommon/arch.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """Module to define supported Windows chip architectures.
 """
@@ -37,22 +37,22 @@ class ArchDefinition(object):
         self.synonyms = synonyms
 
 SupportedArchitectureList = [
-    ArchitectureDefinition(
+    ArchDefinition(
         'x86',
         ['i386', 'i486', 'i586', 'i686'],
     ),
 
-    ArchitectureDefinition(
+    ArchDefinition(
         'x86_64',
         ['AMD64', 'amd64', 'em64t', 'EM64T', 'x86_64'],
     ),
 
-    ArchitectureDefinition(
+    ArchDefinition(
         'ia64',
         ['IA64'],
     ),
     
-    ArchitectureDefinition(
+    ArchDefinition(
         'arm',
         ['ARM'],
     ),
diff --git a/src/engine/SCons/Tool/MSCommon/common.py b/src/engine/SCons/Tool/MSCommon/common.py
index fcf623f..c8db141 100644
--- a/src/engine/SCons/Tool/MSCommon/common.py
+++ b/src/engine/SCons/Tool/MSCommon/common.py
@@ -2,7 +2,7 @@
 Common helper functions for working with the Microsoft tool chain.
 """
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -25,7 +25,7 @@ Common helper functions for working with the Microsoft tool chain.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/common.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/MSCommon/common.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import copy
 import os
@@ -46,7 +46,7 @@ elif LOGFILE:
         debug = lambda message: open(LOGFILE, 'a').write(message + '\n')
     else:
         logging.basicConfig(filename=LOGFILE, level=logging.DEBUG)
-        debug = logging.debug
+        debug = logging.getLogger(name=__name__).debug
 else:
     debug = lambda x: None
 
@@ -188,8 +188,10 @@ def get_output(vcbat, args = None, env = None):
     # Use the .stdout and .stderr attributes directly because the
     # .communicate() method uses the threading module on Windows
     # and won't work under Pythons not built with threading.
-    stdout = popen.stdout.read()
-    stderr = popen.stderr.read()
+    with popen.stdout:
+        stdout = popen.stdout.read()
+    with popen.stderr:
+        stderr = popen.stderr.read()
 
     # Extra debug logic, uncomment if necessary
 #     debug('get_output():stdout:%s'%stdout)
@@ -206,7 +208,7 @@ def get_output(vcbat, args = None, env = None):
     output = stdout.decode("mbcs")
     return output
 
-def parse_output(output, keep=("INCLUDE", "LIB", "LIBPATH", "PATH")):
+def parse_output(output, keep=("INCLUDE", "LIB", "LIBPATH", "PATH", 'VSCMD_ARG_app_plat')):
     """
     Parse output from running visual c++/studios vcvarsall.bat and running set
     To capture the values listed in keep
diff --git a/src/engine/SCons/Tool/MSCommon/netframework.py b/src/engine/SCons/Tool/MSCommon/netframework.py
index b769c44..01bb5b7 100644
--- a/src/engine/SCons/Tool/MSCommon/netframework.py
+++ b/src/engine/SCons/Tool/MSCommon/netframework.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,7 +20,7 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/netframework.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/MSCommon/netframework.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """
 """
diff --git a/src/engine/SCons/Tool/MSCommon/sdk.py b/src/engine/SCons/Tool/MSCommon/sdk.py
index 8bc9830..2814d97 100644
--- a/src/engine/SCons/Tool/MSCommon/sdk.py
+++ b/src/engine/SCons/Tool/MSCommon/sdk.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/sdk.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/MSCommon/sdk.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """Module to detect the Platform/Windows SDK
 
@@ -178,6 +178,16 @@ SDK100VCSetupScripts =    {'x86'      : r'bin\vcvars32.bat',
 #
 # If you update this list, update the documentation in Tool/mssdk.xml.
 SupportedSDKList = [
+    WindowsSDK('10.0A',
+               sanity_check_file=r'bin\SetEnv.Cmd',
+               include_subdir='include',
+               lib_subdir={
+                   'x86'       : ['lib'],
+                   'x86_64'    : [r'lib\x64'],
+                   'ia64'      : [r'lib\ia64'],
+               },
+               vc_setup_scripts = SDK70VCSetupScripts,
+              ),
     WindowsSDK('10.0',
                sanity_check_file=r'bin\SetEnv.Cmd',
                include_subdir='include',
diff --git a/src/engine/SCons/Tool/MSCommon/vc.py b/src/engine/SCons/Tool/MSCommon/vc.py
index fba86af..5de85d6 100644
--- a/src/engine/SCons/Tool/MSCommon/vc.py
+++ b/src/engine/SCons/Tool/MSCommon/vc.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@
 #   * test on 64 bits XP +  VS 2005 (and VS 6 if possible)
 #   * SDK
 #   * Assembly
-__revision__ = "src/engine/SCons/Tool/MSCommon/vc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/MSCommon/vc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """Module for Visual C/C++ detection and configuration.
 """
@@ -43,6 +43,7 @@ import platform
 from string import digits as string_digits
 
 import SCons.Warnings
+from SCons.Tool import find_program_path
 
 from . import common
 
@@ -79,15 +80,43 @@ _ARCH_TO_CANONICAL = {
     "i486"      : "x86",
     "i586"      : "x86",
     "i686"      : "x86",
-    "ia64"      : "ia64",
-    "itanium"   : "ia64",
+    "ia64"      : "ia64",      # deprecated
+    "itanium"   : "ia64",      # deprecated
     "x86"       : "x86",
     "x86_64"    : "amd64",
-    "x86_amd64" : "x86_amd64", # Cross compile to 64 bit from 32bits
+    "arm"       : "arm",
+    "arm64"     : "arm64",
+    "aarch64"   : "arm64",
 }
 
-# Given a (host, target) tuple, return the argument for the bat file. Both host
-# and targets should be canonalized.
+# get path to the cl.exe dir for newer VS versions
+# based off a tuple of (host, target) platforms
+_HOST_TARGET_TO_CL_DIR_GREATER_THAN_14 = {
+    ("amd64","amd64")  : "Hostx64\\x64",
+    ("amd64","x86")    : "Hostx64\\x86",
+    ("amd64","arm")    : "Hostx64\\arm",
+    ("amd64","arm64")  : "Hostx64\\arm64",
+    ("x86","amd64")    : "Hostx86\\x64",
+    ("x86","x86")      : "Hostx86\\x86",
+    ("x86","arm")      : "Hostx86\\arm",
+    ("x86","arm64")    : "Hostx86\\arm64",
+}
+
+# get path to the cl.exe dir for older VS versions
+# based off a tuple of (host, target) platforms
+_HOST_TARGET_TO_CL_DIR = {
+    ("amd64","amd64")  : "amd64",
+    ("amd64","x86")    : "amd64_x86",
+    ("amd64","arm")    : "amd64_arm",
+    ("amd64","arm64")  : "amd64_arm64",
+    ("x86","amd64")    : "x86_amd64",
+    ("x86","x86")      : "",
+    ("x86","arm")      : "x86_arm",
+    ("x86","arm64")    : "x86_arm64",
+}
+
+# Given a (host, target) tuple, return the argument for the bat file.
+# Both host and targets should be canonalized.
 _HOST_TARGET_ARCH_TO_BAT_ARCH = {
     ("x86", "x86"): "x86",
     ("x86", "amd64"): "x86_amd64",
@@ -95,9 +124,32 @@ _HOST_TARGET_ARCH_TO_BAT_ARCH = {
     ("amd64", "x86_amd64"): "x86_amd64", # This is present in (at least) VS2012 express
     ("amd64", "amd64"): "amd64",
     ("amd64", "x86"): "x86",
-    ("x86", "ia64"): "x86_ia64"
+    ("x86", "ia64"): "x86_ia64",         # gone since 14.0
+    ("arm", "arm"): "arm",              # since 14.0, maybe gone 14.1?
+    ("x86", "arm"): "x86_arm",          # since 14.0
+    ("x86", "arm64"): "x86_arm64",      # since 14.1
+    ("amd64", "arm"): "amd64_arm",      # since 14.0
+    ("amd64", "arm64"): "amd64_arm64",  # since 14.1
 }
 
+_CL_EXE_NAME = 'cl.exe'
+
+def get_msvc_version_numeric(msvc_version):
+    """Get the raw version numbers from a MSVC_VERSION string, so it
+    could be cast to float or other numeric values. For example, '14.0Exp'
+    would get converted to '14.0'.
+
+    Args:
+        msvc_version: str
+            string representing the version number, could contain non
+            digit characters
+
+    Returns:
+        str: the value converted to a numeric only string
+
+    """
+    return ''.join([x for  x in msvc_version if x in string_digits + '.'])
+
 def get_host_target(env):
     debug('vc.py:get_host_target()')
 
@@ -188,7 +240,7 @@ _VCVER_TO_PRODUCT_DIR = {
 }
 
 def msvc_version_to_maj_min(msvc_version):
-    msvc_version_numeric = ''.join([x for  x in msvc_version if x in string_digits + '.'])
+    msvc_version_numeric = get_msvc_version_numeric(msvc_version)
 
     t = msvc_version_numeric.split(".")
     if not len(t) == 2:
@@ -201,21 +253,21 @@ def msvc_version_to_maj_min(msvc_version):
         raise ValueError("Unrecognized version %s (%s)" % (msvc_version,msvc_version_numeric))
 
 def is_host_target_supported(host_target, msvc_version):
-    """Return True if the given (host, target) tuple is supported given the
-    msvc version.
-
-    Parameters
-    ----------
-    host_target: tuple
-        tuple of (canonalized) host-target, e.g. ("x86", "amd64") for cross
-        compilation from 32 bits windows to 64 bits.
-    msvc_version: str
-        msvc version (major.minor, e.g. 10.0)
-
-    Note
-    ----
-    This only check whether a given version *may* support the given (host,
-    target), not that the toolchain is actually present on the machine.
+    """Check if the given (host, target) tuple is supported for given version.
+
+    Args:
+        host_target: tuple
+            tuple of (canonalized) host-targets, e.g. ("x86", "amd64")
+            for cross compilation from 32 bit Windows to 64 bits.
+        msvc_version: str
+            msvc version (major.minor, e.g. 10.0)
+
+    Returns:
+        bool:
+
+    Note:
+        This only checks whether a given version *may* support the given (host,
+        target), not that the toolchain is actually present on the machine.
     """
     # We assume that any Visual Studio version supports x86 as a target
     if host_target[1] != "x86":
@@ -228,40 +280,69 @@ def is_host_target_supported(host_target, msvc_version):
 
 def find_vc_pdir_vswhere(msvc_version):
     """
-    Find the MSVC product directory using vswhere.exe .
+    Find the MSVC product directory using vswhere.exe.
+
     Run it asking for specified version and get MSVS  install location
     :param msvc_version:
-    :return: MSVC install dir
+    :return: MSVC install dir or None
     """
-    vswhere_path = os.path.join(
-        'C:\\',
-        'Program Files (x86)',
-        'Microsoft Visual Studio',
-        'Installer',
-        'vswhere.exe'
-    )
-    vswhere_cmd = [vswhere_path, '-version', msvc_version, '-property', 'installationPath']
+
+    # For bug 3333 - support default location of vswhere for both 64 and 32 bit windows
+    # installs. 
+    for pf in ['Program Files (x86)', 'Program Files']:
+        vswhere_path = os.path.join(
+            'C:\\',
+            pf,
+            'Microsoft Visual Studio',
+            'Installer',
+            'vswhere.exe'
+        )
+        if os.path.exists(vswhere_path):
+            # If we found vswhere, then use it.
+            break
+
+    vswhere_cmd = [vswhere_path, '-products', '*', '-version', msvc_version, '-property', 'installationPath']
 
     if os.path.exists(vswhere_path):
-        sp = subprocess.Popen(vswhere_cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        #TODO PY27 cannot use Popen as context manager
+        # try putting it back to the old way for now
+        sp = subprocess.Popen(vswhere_cmd,
+                              stdout=subprocess.PIPE,
+                              stderr=subprocess.PIPE)
         vsdir, err = sp.communicate()
-        vsdir = vsdir.decode("mbcs")
-        vsdir = vsdir.rstrip()
-        vc_pdir = os.path.join(vsdir, 'VC')
-        return vc_pdir
+        if vsdir:
+            vsdir = vsdir.decode("mbcs").splitlines()
+            # vswhere could easily return multiple lines
+            # we could define a way to pick the one we prefer, but since
+            # this data is currently only used to make a check for existence,
+            # returning the first hit should be good enough for now.
+            vc_pdir = os.path.join(vsdir[0], 'VC')
+            return vc_pdir
     else:
         # No vswhere on system, no install info available
         return None
 
 
 def find_vc_pdir(msvc_version):
-    """Try to find the product directory for the given
-    version.
+    """Find the product directory for the given version.
+
+    Tries to look up the path using a registry key from the table
+    _VCVER_TO_PRODUCT_DIR; if there is no key, calls find_vc_pdir_wshere
+    for help instead.
+
+    Args:
+        msvc_version: str
+            msvc version (major.minor, e.g. 10.0)
+
+    Returns:
+        str: Path found in registry, or None
 
-    Note
-    ----
-    If for some reason the requested version could not be found, an
-    exception which inherits from VisualCException will be raised."""
+    Raises:
+        UnsupportedVersion: if the version is not known by this file.
+        MissingConfiguration: found version but the directory is missing.
+
+        Both exceptions inherit from VisualCException.
+    """
     root = 'Software\\'
     try:
         hkeys = _VCVER_TO_PRODUCT_DIR[msvc_version]
@@ -275,8 +356,10 @@ def find_vc_pdir(msvc_version):
             if not key:
                 comps = find_vc_pdir_vswhere(msvc_version)
                 if not comps:
-                    debug('find_vc_dir(): no VC found via vswhere for version {}'.format(repr(key)))
+                    debug('find_vc_pdir_vswhere(): no VC found for version {}'.format(repr(msvc_version)))
                     raise SCons.Util.WinError
+                debug('find_vc_pdir_vswhere(): VC found: {}'.format(repr(msvc_version)))
+                return comps
             else:
                 if common.is_win64():
                     try:
@@ -308,10 +391,10 @@ def find_batch_file(env,msvc_version,host_arch,target_arch):
     if pdir is None:
         raise NoVersionFound("No version of Visual Studio found")
 
-    debug('vc.py: find_batch_file() pdir:{}'.format(pdir))
+    debug('vc.py: find_batch_file() in {}'.format(pdir))
 
     # filter out e.g. "Exp" from the version name
-    msvc_ver_numeric = ''.join([x for x in msvc_version if x in string_digits + "."])
+    msvc_ver_numeric = get_msvc_version_numeric(msvc_version)
     vernum = float(msvc_ver_numeric)
     if 7 <= vernum < 8:
         pdir = os.path.join(pdir, os.pardir, "Common7", "Tools")
@@ -343,23 +426,132 @@ def find_batch_file(env,msvc_version,host_arch,target_arch):
 
 __INSTALLED_VCS_RUN = None
 
-def cached_get_installed_vcs():
+def _check_cl_exists_in_vc_dir(env, vc_dir, msvc_version):
+    """Find the cl.exe on the filesystem in the vc_dir depending on
+    TARGET_ARCH, HOST_ARCH and the msvc version. TARGET_ARCH and
+    HOST_ARCH can be extracted from the passed env, unless its None,
+    which then the native platform is assumed the host and target.
+
+    Args:
+        env: Environment
+            a construction environment, usually if this is passed its
+            because there is a desired TARGET_ARCH to be used when searching
+            for a cl.exe
+        vc_dir: str
+            the path to the VC dir in the MSVC installation
+        msvc_version: str
+            msvc version (major.minor, e.g. 10.0)
+
+    Returns:
+        bool:
+
+    """
+
+    # determine if there is a specific target platform we want to build for and
+    # use that to find a list of valid VCs, default is host platform == target platform
+    # and same for if no env is specified to extract target platform from
+    if env:
+        (host_platform, target_platform, req_target_platform) = get_host_target(env)
+    else:
+        host_platform = platform.machine().lower()
+        target_platform = host_platform
+
+    host_platform = _ARCH_TO_CANONICAL[host_platform]
+    target_platform = _ARCH_TO_CANONICAL[target_platform]
+
+    debug('_check_cl_exists_in_vc_dir(): host platform %s, target platform %s' % (host_platform, target_platform))
+
+    ver_num = float(get_msvc_version_numeric(msvc_version))
+
+    # make sure the cl.exe exists meaning the tool is installed
+    if ver_num > 14:
+        # 2017 and newer allowed multiple versions of the VC toolset to be installed at the same time.
+        # Just get the default tool version for now
+        #TODO: support setting a specific minor VC version
+        default_toolset_file = os.path.join(vc_dir, r'Auxiliary\Build\Microsoft.VCToolsVersion.default.txt')
+        try:
+            with open(default_toolset_file) as f:
+                vc_specific_version = f.readlines()[0].strip()
+        except IOError:
+            debug('_check_cl_exists_in_vc_dir(): failed to read ' + default_toolset_file)
+            return False
+        except IndexError:
+            debug('_check_cl_exists_in_vc_dir(): failed to find MSVC version in ' + default_toolset_file)
+            return False
+
+        host_trgt_dir = _HOST_TARGET_TO_CL_DIR_GREATER_THAN_14.get((host_platform, target_platform), None)
+        if not host_trgt_dir:
+            debug('_check_cl_exists_in_vc_dir(): unsupported host/target platform combo')
+            return False
+
+        cl_path = os.path.join(vc_dir, r'Tools\MSVC', vc_specific_version, 'bin', host_trgt_dir, _CL_EXE_NAME)
+        debug('_check_cl_exists_in_vc_dir(): checking for ' + _CL_EXE_NAME + ' at ' + cl_path)
+        if os.path.exists(cl_path):
+            debug('_check_cl_exists_in_vc_dir(): found ' + _CL_EXE_NAME + '!')
+            return True
+
+    elif ver_num <= 14 and ver_num >= 8:
+
+        host_trgt_dir = _HOST_TARGET_TO_CL_DIR.get((host_platform, target_platform), None)
+        if not host_trgt_dir:
+            debug('_check_cl_exists_in_vc_dir(): unsupported host/target platform combo')
+            return False
+
+        cl_path = os.path.join(vc_dir, 'bin',  host_trgt_dir, _CL_EXE_NAME)
+        debug('_check_cl_exists_in_vc_dir(): checking for ' + _CL_EXE_NAME + ' at ' + cl_path)
+
+        cl_path_exists = os.path.exists(cl_path)
+        if not cl_path_exists and host_platform == 'amd64':
+            # older versions of visual studio only had x86 binaries,
+            # so if the host platform is amd64, we need to check cross
+            # compile options (x86 binary compiles some other target on a 64 bit os)
+            host_trgt_dir = _HOST_TARGET_TO_CL_DIR.get(('x86', target_platform), None)
+            if not host_trgt_dir:
+                return False
+
+            cl_path = os.path.join(vc_dir, 'bin', host_trgt_dir, _CL_EXE_NAME)
+            debug('_check_cl_exists_in_vc_dir(): checking for ' + _CL_EXE_NAME + ' at ' + cl_path)
+            cl_path_exists = os.path.exists(cl_path)
+
+        if cl_path_exists:
+            debug('_check_cl_exists_in_vc_dir(): found ' + _CL_EXE_NAME + '!')
+            return True
+
+    elif ver_num < 8 and ver_num >= 6:
+        # not sure about these versions so if a walk the VC dir (could be slow)
+        for root, _, files in os.walk(vc_dir):
+            if _CL_EXE_NAME in files:
+                debug('get_installed_vcs ' + _CL_EXE_NAME + ' found %s' % os.path.join(root, _CL_EXE_NAME))
+                return True
+        return False
+    else:
+        # version not support return false
+        debug('_check_cl_exists_in_vc_dir(): unsupported MSVC version: ' + str(ver_num))
+
+    return False
+
+def cached_get_installed_vcs(env=None):
     global __INSTALLED_VCS_RUN
 
     if __INSTALLED_VCS_RUN is None:
-        ret = get_installed_vcs()
+        ret = get_installed_vcs(env)
         __INSTALLED_VCS_RUN = ret
 
     return __INSTALLED_VCS_RUN
 
-def get_installed_vcs():
+def get_installed_vcs(env=None):
     installed_versions = []
+
     for ver in _VCVER:
         debug('trying to find VC %s' % ver)
         try:
-            if find_vc_pdir(ver):
+            VC_DIR = find_vc_pdir(ver)
+            if VC_DIR:
                 debug('found VC %s' % ver)
-                installed_versions.append(ver)
+                if _check_cl_exists_in_vc_dir(env, VC_DIR, ver):
+                    installed_versions.append(ver)
+                else:
+                    debug('find_vc_pdir no compiler found %s' % ver)
             else:
                 debug('find_vc_pdir return None for ver %s' % ver)
         except VisualCException as e:
@@ -416,7 +608,7 @@ def get_default_version(env):
                     % (msvc_version, msvs_version))
         return msvs_version
     if not msvc_version:
-        installed_vcs = cached_get_installed_vcs()
+        installed_vcs = cached_get_installed_vcs(env)
         debug('installed_vcs:%s' % installed_vcs)
         if not installed_vcs:
             #msg = 'No installed VCs'
@@ -443,16 +635,17 @@ def msvc_find_valid_batch_script(env,version):
     debug('vc.py:msvc_find_valid_batch_script()')
     # Find the host platform, target platform, and if present the requested
     # target platform
-    (host_platform, target_platform,req_target_platform) = get_host_target(env)
+    platforms = get_host_target(env)
+    debug("vc.py: msvs_find_valid_batch_script(): host_platform %s, target_platform %s req_target_platform:%s" % platforms)
 
+    host_platform, target_platform, req_target_platform = platforms
     try_target_archs = [target_platform]
-    debug("msvs_find_valid_batch_script(): req_target_platform %s target_platform:%s"%(req_target_platform,target_platform))
 
     # VS2012 has a "cross compile" environment to build 64 bit
     # with x86_amd64 as the argument to the batch setup script
-    if req_target_platform in ('amd64','x86_64'):
+    if req_target_platform in ('amd64', 'x86_64'):
         try_target_archs.append('x86_amd64')
-    elif not req_target_platform and target_platform in ['amd64','x86_64']:
+    elif not req_target_platform and target_platform in ['amd64', 'x86_64']:
         # There may not be "native" amd64, but maybe "cross" x86_amd64 tools
         try_target_archs.append('x86_amd64')
         # If the user hasn't specifically requested a TARGET_ARCH, and
@@ -474,7 +667,7 @@ def msvc_find_valid_batch_script(env,version):
                 (host_target, version)
             SCons.Warnings.warn(SCons.Warnings.VisualCMissingWarning, warn_msg)
         arg = _HOST_TARGET_ARCH_TO_BAT_ARCH[host_target]
-        
+
         # Get just version numbers
         maj, min = msvc_version_to_maj_min(version)
         # VS2015+
@@ -493,15 +686,17 @@ def msvc_find_valid_batch_script(env,version):
             warn_msg = "VC version %s not installed.  " + \
                        "C/C++ compilers are most likely not set correctly.\n" + \
                        " Installed versions are: %s"
-            warn_msg = warn_msg % (version, cached_get_installed_vcs())
+            warn_msg = warn_msg % (version, cached_get_installed_vcs(env))
             SCons.Warnings.warn(SCons.Warnings.VisualCMissingWarning, warn_msg)
             continue
 
         # Try to use the located batch file for this host/target platform combo
         debug('vc.py:msvc_find_valid_batch_script() use_script 2 %s, args:%s\n' % (repr(vc_script), arg))
+        found = None
         if vc_script:
             try:
                 d = script_env(vc_script, args=arg)
+                found = vc_script
             except BatchFileExecutionError as e:
                 debug('vc.py:msvc_find_valid_batch_script() use_script 3: failed running VC script %s: %s: Error:%s'%(repr(vc_script),arg,e))
                 vc_script=None
@@ -510,6 +705,7 @@ def msvc_find_valid_batch_script(env,version):
             debug('vc.py:msvc_find_valid_batch_script() use_script 4: trying sdk script: %s'%(sdk_script))
             try:
                 d = script_env(sdk_script)
+                found = sdk_script
             except BatchFileExecutionError as e:
                 debug('vc.py:msvc_find_valid_batch_script() use_script 5: failed running SDK script %s: Error:%s'%(repr(sdk_script),e))
                 continue
@@ -517,7 +713,7 @@ def msvc_find_valid_batch_script(env,version):
             debug('vc.py:msvc_find_valid_batch_script() use_script 6: Neither VC script nor SDK script found')
             continue
 
-        debug("vc.py:msvc_find_valid_batch_script() Found a working script/target: %s %s"%(repr(sdk_script),arg))
+        debug("vc.py:msvc_find_valid_batch_script() Found a working script/target: %s/%s"%(repr(found),arg))
         break # We've found a working target_platform, so stop looking
 
     # If we cannot find a viable installed compiler, reset the TARGET_ARCH
@@ -566,8 +762,14 @@ def msvc_setup_env(env):
         debug('vc.py:msvc_setup_env() env:%s -> %s'%(k,v))
         env.PrependENVPath(k, v, delete_existing=True)
 
-def msvc_exists(version=None):
-    vcs = cached_get_installed_vcs()
+    # final check to issue a warning if the compiler is not present
+    msvc_cl = find_program_path(env, 'cl')
+    if not msvc_cl:
+        SCons.Warnings.warn(SCons.Warnings.VisualCMissingWarning,
+            "Could not find MSVC compiler 'cl', it may need to be installed separately with Visual Studio")
+
+def msvc_exists(env=None, version=None):
+    vcs = cached_get_installed_vcs(env)
     if version is None:
         return len(vcs) > 0
     return version in vcs
diff --git a/src/engine/SCons/Tool/MSCommon/vs.py b/src/engine/SCons/Tool/MSCommon/vs.py
index dafdbaf..72d4421 100644
--- a/src/engine/SCons/Tool/MSCommon/vs.py
+++ b/src/engine/SCons/Tool/MSCommon/vs.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/vs.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/MSCommon/vs.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """Module to detect Visual Studio and/or Visual C/C++
 """
@@ -68,9 +68,9 @@ class VisualStudio(object):
         SCons.Tool.MSCommon.vc.get_installed_vcs()
         dir = SCons.Tool.MSCommon.vc.find_vc_pdir(self.vc_version)
         if not dir:
-            debug('find_vs_dir():  no installed VC %s' % self.vc_version)
+            debug('find_vs_dir_by_vc():  no installed VC %s' % self.vc_version)
             return None
-        return dir
+        return os.path.abspath(os.path.join(dir, os.pardir))
 
     def find_vs_dir_by_reg(self):
         root = 'Software\\'
@@ -95,12 +95,11 @@ class VisualStudio(object):
         First try to find by registry, and if that fails find via VC dir
         """
 
-
-        if True:
-            vs_dir=self.find_vs_dir_by_reg()
-            return vs_dir
-        else:
-            return self.find_vs_dir_by_vc()
+        vs_dir=self.find_vs_dir_by_reg()
+        if not vs_dir:
+            vs_dir = self.find_vs_dir_by_vc()
+        debug('find_vs_dir(): found VS in ' + str(vs_dir ))
+        return vs_dir
 
     def find_executable(self):
         vs_dir = self.get_vs_dir()
diff --git a/src/engine/SCons/Tool/PharLapCommon.py b/src/engine/SCons/Tool/PharLapCommon.py
index c45c6d3..103e21c 100644
--- a/src/engine/SCons/Tool/PharLapCommon.py
+++ b/src/engine/SCons/Tool/PharLapCommon.py
@@ -7,7 +7,7 @@ Phar Lap ETS tool chain.  Right now, this is linkloc and
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -29,7 +29,7 @@ Phar Lap ETS tool chain.  Right now, this is linkloc and
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/PharLapCommon.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/PharLapCommon.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
diff --git a/src/engine/SCons/Tool/ToolTests.py b/src/engine/SCons/Tool/ToolTests.py
index f5678c1..81b6491 100644
--- a/src/engine/SCons/Tool/ToolTests.py
+++ b/src/engine/SCons/Tool/ToolTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ToolTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ToolTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
diff --git a/src/engine/SCons/Tool/__init__.py b/src/engine/SCons/Tool/__init__.py
index 9265b81..b7d5dcc 100644
--- a/src/engine/SCons/Tool/__init__.py
+++ b/src/engine/SCons/Tool/__init__.py
@@ -14,7 +14,7 @@ tool definition.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -35,7 +35,7 @@ tool definition.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import imp
 import importlib
@@ -44,7 +44,6 @@ import re
 import os
 import shutil
 
-
 import SCons.Builder
 import SCons.Errors
 import SCons.Node.FS
@@ -56,7 +55,7 @@ import SCons.Scanner.Prog
 import SCons.Scanner.SWIG
 import collections
 
-DefaultToolpath=[]
+DefaultToolpath = []
 
 CScanner = SCons.Scanner.C.CScanner()
 DScanner = SCons.Scanner.D.DScanner()
@@ -97,20 +96,20 @@ for suffix in LaTeXSuffixes:
     SourceFileScanner.add_scanner(suffix, LaTeXScanner)
     SourceFileScanner.add_scanner(suffix, PDFLaTeXScanner)
 
-
 # Tool aliases are needed for those tools whos module names also
 # occur in the python standard library. This causes module shadowing and
 # can break using python library functions under python3
 TOOL_ALIASES = {
-    'gettext':'gettext_tool',
+    'gettext': 'gettext_tool',
     'clang++': 'clangxx',
 }
 
+
 class Tool(object):
     def __init__(self, name, toolpath=[], **kw):
 
         # Rename if there's a TOOL_ALIAS for this tool
-        self.name = TOOL_ALIASES.get(name,name)
+        self.name = TOOL_ALIASES.get(name, name)
         self.toolpath = toolpath + DefaultToolpath
         # remember these so we can merge them into the call
         self.init_kw = kw
@@ -136,7 +135,7 @@ class Tool(object):
         sys.path = self.toolpath + sys.path
         # sys.stderr.write("Tool:%s\nPATH:%s\n"%(self.name,sys.path))
 
-        if sys.version_info[0] < 3 or (sys.version_info[0] == 3 and sys.version_info[1] in (0,1,2,3,4)):
+        if sys.version_info[0] < 3 or (sys.version_info[0] == 3 and sys.version_info[1] in (0, 1, 2, 3, 4)):
             # Py 2 code
             try:
                 try:
@@ -149,7 +148,7 @@ class Tool(object):
                             file.close()
                 except ImportError as e:
                     splitname = self.name.split('.')
-                    if str(e)!="No module named %s"%splitname[0]:
+                    if str(e) != "No module named %s" % splitname[0]:
                         raise SCons.Errors.EnvironmentError(e)
                     try:
                         import zipimport
@@ -184,46 +183,48 @@ class Tool(object):
             add_to_scons_tools_namespace = False
             for path in self.toolpath:
                 sepname = self.name.replace('.', os.path.sep)
-                file_path = os.path.join(path, "%s.py"%sepname)
+                file_path = os.path.join(path, "%s.py" % sepname)
                 file_package = os.path.join(path, sepname)
 
-                if debug: sys.stderr.write("Trying:%s %s\n"%(file_path, file_package))
+                if debug: sys.stderr.write("Trying:%s %s\n" % (file_path, file_package))
 
                 if os.path.isfile(file_path):
                     spec = importlib.util.spec_from_file_location(self.name, file_path)
-                    if debug: print("file_Path:%s FOUND"%file_path)
+                    if debug: print("file_Path:%s FOUND" % file_path)
                     break
                 elif os.path.isdir(file_package):
                     file_package = os.path.join(file_package, '__init__.py')
                     spec = importlib.util.spec_from_file_location(self.name, file_package)
-                    if debug: print("PACKAGE:%s Found"%file_package)
+                    if debug: print("PACKAGE:%s Found" % file_package)
                     break
 
                 else:
                     continue
 
             if spec is None:
-                if debug: sys.stderr.write("NO SPEC :%s\n"%self.name)
-                spec = importlib.util.find_spec("."+self.name, package='SCons.Tool')
+                if debug: sys.stderr.write("NO SPEC :%s\n" % self.name)
+                spec = importlib.util.find_spec("." + self.name, package='SCons.Tool')
                 if spec:
-                    found_name = 'SCons.Tool.'+self.name
+                    found_name = 'SCons.Tool.' + self.name
                     add_to_scons_tools_namespace = True
-                if debug: sys.stderr.write("Spec Found? .%s :%s\n"%(self.name, spec))
+                if debug: sys.stderr.write("Spec Found? .%s :%s\n" % (self.name, spec))
 
             if spec is None:
-                error_string = "No module named %s"%self.name
+                error_string = "No module named %s" % self.name
                 raise SCons.Errors.EnvironmentError(error_string)
 
             module = importlib.util.module_from_spec(spec)
             if module is None:
-                if debug: print("MODULE IS NONE:%s"%self.name)
-                error_string = "No module named %s"%self.name
+                if debug: print("MODULE IS NONE:%s" % self.name)
+                error_string = "No module named %s" % self.name
                 raise SCons.Errors.EnvironmentError(error_string)
 
             # Don't reload a tool we already loaded.
-            sys_modules_value = sys.modules.get(found_name,False)
+            sys_modules_value = sys.modules.get(found_name, False)
+
+            found_module = None
             if sys_modules_value and sys_modules_value.__file__ == spec.origin:
-                return sys.modules[found_name]
+                found_module = sys.modules[found_name]
             else:
                 # Not sure what to do in the case that there already
                 # exists sys.modules[self.name] but the source file is
@@ -235,8 +236,11 @@ class Tool(object):
                     # If we found it in SCons.Tool, then add it to the module
                     setattr(SCons.Tool, self.name, module)
 
-                return module
+                found_module = module
 
+            if found_module is not None:
+                sys.path = oldpythonpath
+                return found_module
 
         sys.path = oldpythonpath
 
@@ -253,11 +257,11 @@ class Tool(object):
                         file.close()
                     return module
                 except ImportError as e:
-                    if str(e)!="No module named %s"%self.name:
+                    if str(e) != "No module named %s" % self.name:
                         raise SCons.Errors.EnvironmentError(e)
                     try:
                         import zipimport
-                        importer = zipimport.zipimporter( sys.modules['SCons.Tool'].__path__[0] )
+                        importer = zipimport.zipimporter(sys.modules['SCons.Tool'].__path__[0])
                         module = importer.load_module(full_name)
                         setattr(SCons.Tool, self.name, module)
                         return module
@@ -278,13 +282,13 @@ class Tool(object):
                 kw.update(call_kw)
             else:
                 kw = self.init_kw
-        env.Append(TOOLS = [ self.name ])
+        env.Append(TOOLS=[self.name])
         if hasattr(self, 'options'):
             import SCons.Variables
             if 'options' not in env:
                 from SCons.Script import ARGUMENTS
-                env['options']=SCons.Variables.Variables(args=ARGUMENTS)
-            opts=env['options']
+                env['options'] = SCons.Variables.Variables(args=ARGUMENTS)
+            opts = env['options']
 
             self.options(opts)
             opts.Update(env)
@@ -294,6 +298,7 @@ class Tool(object):
     def __str__(self):
         return self.name
 
+
 ##########################################################################
 #  Create common executable program / library / object builders
 
@@ -308,13 +313,13 @@ def createProgBuilder(env):
         program = env['BUILDERS']['Program']
     except KeyError:
         import SCons.Defaults
-        program = SCons.Builder.Builder(action = SCons.Defaults.LinkAction,
-                                        emitter = '$PROGEMITTER',
-                                        prefix = '$PROGPREFIX',
-                                        suffix = '$PROGSUFFIX',
-                                        src_suffix = '$OBJSUFFIX',
-                                        src_builder = 'Object',
-                                        target_scanner = ProgramScanner)
+        program = SCons.Builder.Builder(action=SCons.Defaults.LinkAction,
+                                        emitter='$PROGEMITTER',
+                                        prefix='$PROGPREFIX',
+                                        suffix='$PROGSUFFIX',
+                                        src_suffix='$OBJSUFFIX',
+                                        src_builder='Object',
+                                        target_scanner=ProgramScanner)
         env['BUILDERS']['Program'] = program
 
     return program
@@ -330,23 +335,24 @@ def createStaticLibBuilder(env):
     try:
         static_lib = env['BUILDERS']['StaticLibrary']
     except KeyError:
-        action_list = [ SCons.Action.Action("$ARCOM", "$ARCOMSTR") ]
-        if env.get('RANLIB',False) or env.Detect('ranlib'):
+        action_list = [SCons.Action.Action("$ARCOM", "$ARCOMSTR")]
+        if env.get('RANLIB', False) or env.Detect('ranlib'):
             ranlib_action = SCons.Action.Action("$RANLIBCOM", "$RANLIBCOMSTR")
             action_list.append(ranlib_action)
 
-        static_lib = SCons.Builder.Builder(action = action_list,
-                                           emitter = '$LIBEMITTER',
-                                           prefix = '$LIBPREFIX',
-                                           suffix = '$LIBSUFFIX',
-                                           src_suffix = '$OBJSUFFIX',
-                                           src_builder = 'StaticObject')
+        static_lib = SCons.Builder.Builder(action=action_list,
+                                           emitter='$LIBEMITTER',
+                                           prefix='$LIBPREFIX',
+                                           suffix='$LIBSUFFIX',
+                                           src_suffix='$OBJSUFFIX',
+                                           src_builder='StaticObject')
         env['BUILDERS']['StaticLibrary'] = static_lib
         env['BUILDERS']['Library'] = static_lib
 
     return static_lib
 
-def _call_linker_cb(env, callback, args, result = None):
+
+def _call_linker_cb(env, callback, args, result=None):
     """Returns the result of env['LINKCALLBACKS'][callback](*args)
     if env['LINKCALLBACKS'] is a dictionary and env['LINKCALLBACKS'][callback]
     is callable. If these conditions are not met, return the value provided as
@@ -370,84 +376,109 @@ def _call_linker_cb(env, callback, args, result = None):
         if Verbose:
             print('_call_linker_cb: env["LINKCALLBACKS"][%r] found' % callback)
             print('_call_linker_cb: env["LINKCALLBACKS"][%r]=%r' % (callback, cbfun))
-        if(isinstance(cbfun, collections.Callable)):
+        if isinstance(cbfun, collections.Callable):
             if Verbose:
                 print('_call_linker_cb: env["LINKCALLBACKS"][%r] is callable' % callback)
             result = cbfun(env, *args)
     return result
 
+
 def _call_env_subst(env, string, *args, **kw):
     kw2 = {}
     for k in ('raw', 'target', 'source', 'conv', 'executor'):
-        try: kw2[k] = kw[k]
-        except KeyError: pass
+        try:
+            kw2[k] = kw[k]
+        except KeyError:
+            pass
     return env.subst(string, *args, **kw2)
 
+
 class _ShLibInfoSupport(object):
     def get_libtype(self):
         return 'ShLib'
+
     def get_lib_prefix(self, env, *args, **kw):
-        return _call_env_subst(env,'$SHLIBPREFIX', *args, **kw)
+        return _call_env_subst(env, '$SHLIBPREFIX', *args, **kw)
+
     def get_lib_suffix(self, env, *args, **kw):
-        return _call_env_subst(env,'$SHLIBSUFFIX', *args, **kw)
+        return _call_env_subst(env, '$SHLIBSUFFIX', *args, **kw)
+
     def get_lib_version(self, env, *args, **kw):
-        return _call_env_subst(env,'$SHLIBVERSION', *args, **kw)
+        return _call_env_subst(env, '$SHLIBVERSION', *args, **kw)
+
     def get_lib_noversionsymlinks(self, env, *args, **kw):
-        return _call_env_subst(env,'$SHLIBNOVERSIONSYMLINKS', *args, **kw)
+        return _call_env_subst(env, '$SHLIBNOVERSIONSYMLINKS', *args, **kw)
+
 
 class _LdModInfoSupport(object):
     def get_libtype(self):
         return 'LdMod'
+
     def get_lib_prefix(self, env, *args, **kw):
-        return _call_env_subst(env,'$LDMODULEPREFIX', *args, **kw)
+        return _call_env_subst(env, '$LDMODULEPREFIX', *args, **kw)
+
     def get_lib_suffix(self, env, *args, **kw):
-        return _call_env_subst(env,'$LDMODULESUFFIX', *args, **kw)
+        return _call_env_subst(env, '$LDMODULESUFFIX', *args, **kw)
+
     def get_lib_version(self, env, *args, **kw):
-        return _call_env_subst(env,'$LDMODULEVERSION', *args, **kw)
+        return _call_env_subst(env, '$LDMODULEVERSION', *args, **kw)
+
     def get_lib_noversionsymlinks(self, env, *args, **kw):
-        return _call_env_subst(env,'$LDMODULENOVERSIONSYMLINKS', *args, **kw)
+        return _call_env_subst(env, '$LDMODULENOVERSIONSYMLINKS', *args, **kw)
+
 
 class _ImpLibInfoSupport(object):
     def get_libtype(self):
         return 'ImpLib'
+
     def get_lib_prefix(self, env, *args, **kw):
-        return _call_env_subst(env,'$IMPLIBPREFIX', *args, **kw)
+        return _call_env_subst(env, '$IMPLIBPREFIX', *args, **kw)
+
     def get_lib_suffix(self, env, *args, **kw):
-        return _call_env_subst(env,'$IMPLIBSUFFIX', *args, **kw)
+        return _call_env_subst(env, '$IMPLIBSUFFIX', *args, **kw)
+
     def get_lib_version(self, env, *args, **kw):
-        version = _call_env_subst(env,'$IMPLIBVERSION', *args, **kw)
+        version = _call_env_subst(env, '$IMPLIBVERSION', *args, **kw)
         if not version:
-            try: lt = kw['implib_libtype']
-            except KeyError: pass
+            try:
+                lt = kw['implib_libtype']
+            except KeyError:
+                pass
             else:
                 if lt == 'ShLib':
-                    version = _call_env_subst(env,'$SHLIBVERSION', *args, **kw)
+                    version = _call_env_subst(env, '$SHLIBVERSION', *args, **kw)
                 elif lt == 'LdMod':
-                    version = _call_env_subst(env,'$LDMODULEVERSION', *args, **kw)
+                    version = _call_env_subst(env, '$LDMODULEVERSION', *args, **kw)
         return version
+
     def get_lib_noversionsymlinks(self, env, *args, **kw):
         disable = None
-        try: env['IMPLIBNOVERSIONSYMLINKS']
+        try:
+            env['IMPLIBNOVERSIONSYMLINKS']
         except KeyError:
-            try: lt = kw['implib_libtype']
-            except KeyError: pass
+            try:
+                lt = kw['implib_libtype']
+            except KeyError:
+                pass
             else:
                 if lt == 'ShLib':
-                    disable = _call_env_subst(env,'$SHLIBNOVERSIONSYMLINKS', *args, **kw)
+                    disable = _call_env_subst(env, '$SHLIBNOVERSIONSYMLINKS', *args, **kw)
                 elif lt == 'LdMod':
-                    disable = _call_env_subst(env,'$LDMODULENOVERSIONSYMLINKS', *args, **kw)
+                    disable = _call_env_subst(env, '$LDMODULENOVERSIONSYMLINKS', *args, **kw)
         else:
-            disable = _call_env_subst(env,'$IMPLIBNOVERSIONSYMLINKS', *args, **kw)
+            disable = _call_env_subst(env, '$IMPLIBNOVERSIONSYMLINKS', *args, **kw)
         return disable
 
+
 class _LibInfoGeneratorBase(object):
     """Generator base class for library-related info such as suffixes for
     versioned libraries, symlink maps, sonames etc. It handles commonities
     of SharedLibrary and LoadableModule
     """
-    _support_classes = { 'ShLib'  : _ShLibInfoSupport,
-                         'LdMod'  : _LdModInfoSupport,
-                         'ImpLib' : _ImpLibInfoSupport }
+    _support_classes = {'ShLib': _ShLibInfoSupport,
+                        'LdMod': _LdModInfoSupport,
+                        'ImpLib': _ImpLibInfoSupport}
+
     def __init__(self, libtype, infoname):
         self.set_libtype(libtype)
         self.set_infoname(infoname)
@@ -469,37 +500,41 @@ class _LibInfoGeneratorBase(object):
         return self.infoname
 
     def get_lib_prefix(self, env, *args, **kw):
-        return self._support.get_lib_prefix(env,*args,**kw)
+        return self._support.get_lib_prefix(env, *args, **kw)
 
     def get_lib_suffix(self, env, *args, **kw):
-        return self._support.get_lib_suffix(env,*args,**kw)
+        return self._support.get_lib_suffix(env, *args, **kw)
 
     def get_lib_version(self, env, *args, **kw):
-        return self._support.get_lib_version(env,*args,**kw)
+        return self._support.get_lib_version(env, *args, **kw)
 
     def get_lib_noversionsymlinks(self, env, *args, **kw):
-        return self._support.get_lib_noversionsymlinks(env,*args,**kw)
+        return self._support.get_lib_noversionsymlinks(env, *args, **kw)
 
     # Returns name of generator linker callback that shall be used to generate
     # our info for a versioned library. For example, if our libtype is 'ShLib'
     # and infoname is 'Prefix', it would return 'VersionedShLibPrefix'.
     def get_versioned_lib_info_generator(self, **kw):
-        try: libtype = kw['generator_libtype']
-        except KeyError: libtype = self.get_libtype()
+        try:
+            libtype = kw['generator_libtype']
+        except KeyError:
+            libtype = self.get_libtype()
         infoname = self.get_infoname()
         return 'Versioned%s%s' % (libtype, infoname)
 
-    def generate_versioned_lib_info(self, env, args, result = None, **kw):
+    def generate_versioned_lib_info(self, env, args, result=None, **kw):
         callback = self.get_versioned_lib_info_generator(**kw)
         return _call_linker_cb(env, callback, args, result)
 
+
 class _LibPrefixGenerator(_LibInfoGeneratorBase):
     """Library prefix generator, used as target_prefix in SharedLibrary and
     LoadableModule builders"""
+
     def __init__(self, libtype):
         super(_LibPrefixGenerator, self).__init__(libtype, 'Prefix')
 
-    def __call__(self, env, sources = None, **kw):
+    def __call__(self, env, sources=None, **kw):
         Verbose = False
 
         if sources and 'source' not in kw:
@@ -508,7 +543,7 @@ class _LibPrefixGenerator(_LibInfoGeneratorBase):
         else:
             kw2 = kw
 
-        prefix = self.get_lib_prefix(env,**kw2)
+        prefix = self.get_lib_prefix(env, **kw2)
         if Verbose:
             print("_LibPrefixGenerator: input prefix=%r" % prefix)
 
@@ -523,17 +558,20 @@ class _LibPrefixGenerator(_LibInfoGeneratorBase):
             print("_LibPrefixGenerator: return prefix=%r" % prefix)
         return prefix
 
-ShLibPrefixGenerator  = _LibPrefixGenerator('ShLib')
-LdModPrefixGenerator  = _LibPrefixGenerator('LdMod')
+
+ShLibPrefixGenerator = _LibPrefixGenerator('ShLib')
+LdModPrefixGenerator = _LibPrefixGenerator('LdMod')
 ImpLibPrefixGenerator = _LibPrefixGenerator('ImpLib')
 
+
 class _LibSuffixGenerator(_LibInfoGeneratorBase):
     """Library suffix generator, used as target_suffix in SharedLibrary and
     LoadableModule builders"""
+
     def __init__(self, libtype):
         super(_LibSuffixGenerator, self).__init__(libtype, 'Suffix')
 
-    def __call__(self, env, sources = None, **kw):
+    def __call__(self, env, sources=None, **kw):
         Verbose = False
 
         if sources and 'source' not in kw:
@@ -557,13 +595,16 @@ class _LibSuffixGenerator(_LibInfoGeneratorBase):
             print("_LibSuffixGenerator: return suffix=%r" % suffix)
         return suffix
 
-ShLibSuffixGenerator  = _LibSuffixGenerator('ShLib')
-LdModSuffixGenerator  = _LibSuffixGenerator('LdMod')
+
+ShLibSuffixGenerator = _LibSuffixGenerator('ShLib')
+LdModSuffixGenerator = _LibSuffixGenerator('LdMod')
 ImpLibSuffixGenerator = _LibSuffixGenerator('ImpLib')
 
+
 class _LibSymlinkGenerator(_LibInfoGeneratorBase):
     """Library symlink map generator. It generates a list of symlinks that
     should be created by SharedLibrary or LoadableModule builders"""
+
     def __init__(self, libtype):
         super(_LibSymlinkGenerator, self).__init__(libtype, 'Symlinks')
 
@@ -588,18 +629,20 @@ class _LibSymlinkGenerator(_LibInfoGeneratorBase):
             print('_LibSymlinkGenerator: disable=%r' % disable)
 
         if version and not disable:
-            prefix = self.get_lib_prefix(env,**kw2)
-            suffix = self.get_lib_suffix(env,**kw2)
+            prefix = self.get_lib_prefix(env, **kw2)
+            suffix = self.get_lib_suffix(env, **kw2)
             symlinks = self.generate_versioned_lib_info(env, [libnode, version, prefix, suffix], **kw2)
 
         if Verbose:
             print('_LibSymlinkGenerator: return symlinks=%r' % StringizeLibSymlinks(symlinks))
         return symlinks
 
-ShLibSymlinkGenerator =  _LibSymlinkGenerator('ShLib')
-LdModSymlinkGenerator =  _LibSymlinkGenerator('LdMod')
+
+ShLibSymlinkGenerator = _LibSymlinkGenerator('ShLib')
+LdModSymlinkGenerator = _LibSymlinkGenerator('LdMod')
 ImpLibSymlinkGenerator = _LibSymlinkGenerator('ImpLib')
 
+
 class _LibNameGenerator(_LibInfoGeneratorBase):
     """Generates "unmangled" library name from a library file node.
 
@@ -614,6 +657,7 @@ class _LibNameGenerator(_LibInfoGeneratorBase):
     the _LibNameGenerator shall return "libfoo.so". Other link tools may
     implement it's own way of library name unmangling.
     """
+
     def __init__(self, libtype):
         super(_LibNameGenerator, self).__init__(libtype, 'Name')
 
@@ -636,8 +680,8 @@ class _LibNameGenerator(_LibInfoGeneratorBase):
 
         name = None
         if version:
-            prefix = self.get_lib_prefix(env,**kw2)
-            suffix = self.get_lib_suffix(env,**kw2)
+            prefix = self.get_lib_prefix(env, **kw2)
+            suffix = self.get_lib_suffix(env, **kw2)
             name = self.generate_versioned_lib_info(env, [libnode, version, prefix, suffix], **kw2)
 
         if not name:
@@ -648,13 +692,16 @@ class _LibNameGenerator(_LibInfoGeneratorBase):
 
         return name
 
-ShLibNameGenerator =  _LibNameGenerator('ShLib')
-LdModNameGenerator =  _LibNameGenerator('LdMod')
+
+ShLibNameGenerator = _LibNameGenerator('ShLib')
+LdModNameGenerator = _LibNameGenerator('LdMod')
 ImpLibNameGenerator = _LibNameGenerator('ImpLib')
 
+
 class _LibSonameGenerator(_LibInfoGeneratorBase):
     """Library soname generator. Returns library soname (e.g. libfoo.so.0) for
     a given node (e.g. /foo/bar/libfoo.so.0.1.2)"""
+
     def __init__(self, libtype):
         super(_LibSonameGenerator, self).__init__(libtype, 'Soname')
 
@@ -673,12 +720,12 @@ class _LibSonameGenerator(_LibInfoGeneratorBase):
 
         soname = _call_env_subst(env, '$SONAME', **kw2)
         if not soname:
-            version = self.get_lib_version(env,**kw2)
+            version = self.get_lib_version(env, **kw2)
             if Verbose:
                 print("_LibSonameGenerator: version=%r" % version)
             if version:
-                prefix = self.get_lib_prefix(env,**kw2)
-                suffix = self.get_lib_suffix(env,**kw2)
+                prefix = self.get_lib_prefix(env, **kw2)
+                suffix = self.get_lib_suffix(env, **kw2)
                 soname = self.generate_versioned_lib_info(env, [libnode, version, prefix, suffix], **kw2)
 
         if not soname:
@@ -692,40 +739,44 @@ class _LibSonameGenerator(_LibInfoGeneratorBase):
 
         return soname
 
-ShLibSonameGenerator =  _LibSonameGenerator('ShLib')
-LdModSonameGenerator =  _LibSonameGenerator('LdMod')
+
+ShLibSonameGenerator = _LibSonameGenerator('ShLib')
+LdModSonameGenerator = _LibSonameGenerator('LdMod')
+
 
 def StringizeLibSymlinks(symlinks):
     """Converts list with pairs of nodes to list with pairs of node paths
     (strings). Used mainly for debugging."""
     if SCons.Util.is_List(symlinks):
         try:
-            return [ (k.get_path(), v.get_path()) for k,v in symlinks ]
+            return [(k.get_path(), v.get_path()) for k, v in symlinks]
         except (TypeError, ValueError):
             return symlinks
     else:
         return symlinks
 
+
 def EmitLibSymlinks(env, symlinks, libnode, **kw):
     """Used by emitters to handle (shared/versioned) library symlinks"""
     Verbose = False
 
     # nodes involved in process... all symlinks + library
-    nodes = list(set([ x for x,y in symlinks ] + [libnode]))
+    nodes = list(set([x for x, y in symlinks] + [libnode]))
 
     clean_targets = kw.get('clean_targets', [])
     if not SCons.Util.is_List(clean_targets):
-        clean_targets = [ clean_targets ]
+        clean_targets = [clean_targets]
 
     for link, linktgt in symlinks:
         env.SideEffect(link, linktgt)
-        if(Verbose):
+        if (Verbose):
             print("EmitLibSymlinks: SideEffect(%r,%r)" % (link.get_path(), linktgt.get_path()))
         clean_list = [x for x in nodes if x != linktgt]
         env.Clean(list(set([linktgt] + clean_targets)), clean_list)
-        if(Verbose):
+        if (Verbose):
             print("EmitLibSymlinks: Clean(%r,%r)" % (linktgt.get_path(), [x.get_path() for x in clean_list]))
 
+
 def CreateLibSymlinks(env, symlinks):
     """Physically creates symlinks. The symlinks argument must be a list in
     form [ (link, linktarget), ... ], where link and linktarget are SCons
@@ -736,38 +787,40 @@ def CreateLibSymlinks(env, symlinks):
     for link, linktgt in symlinks:
         linktgt = link.get_dir().rel_path(linktgt)
         link = link.get_path()
-        if(Verbose):
+        if (Verbose):
             print("CreateLibSymlinks: preparing to add symlink %r -> %r" % (link, linktgt))
         # Delete the (previously created) symlink if exists. Let only symlinks
         # to be deleted to prevent accidental deletion of source files...
         if env.fs.islink(link):
             env.fs.unlink(link)
-            if(Verbose):
+            if (Verbose):
                 print("CreateLibSymlinks: removed old symlink %r" % link)
         # If a file or directory exists with the same name as link, an OSError
         # will be thrown, which should be enough, I think.
         env.fs.symlink(linktgt, link)
-        if(Verbose):
+        if (Verbose):
             print("CreateLibSymlinks: add symlink %r -> %r" % (link, linktgt))
     return 0
 
+
 def LibSymlinksActionFunction(target, source, env):
     for tgt in target:
-        symlinks = getattr(getattr(tgt,'attributes', None), 'shliblinks', None)
+        symlinks = getattr(getattr(tgt, 'attributes', None), 'shliblinks', None)
         if symlinks:
             CreateLibSymlinks(env, symlinks)
     return 0
 
+
 def LibSymlinksStrFun(target, source, env, *args):
     cmd = None
     for tgt in target:
-        symlinks = getattr(getattr(tgt,'attributes', None), 'shliblinks', None)
+        symlinks = getattr(getattr(tgt, 'attributes', None), 'shliblinks', None)
         if symlinks:
             if cmd is None: cmd = ""
             if cmd: cmd += "\n"
             cmd += "Create symlinks for: %r" % tgt.get_path()
             try:
-                linkstr = ', '.join([ "%r->%r" %(k,v) for k,v in StringizeLibSymlinks(symlinks)])
+                linkstr = ', '.join(["%r->%r" % (k, v) for k, v in StringizeLibSymlinks(symlinks)])
             except (KeyError, ValueError):
                 pass
             else:
@@ -789,20 +842,21 @@ def createSharedLibBuilder(env):
         shared_lib = env['BUILDERS']['SharedLibrary']
     except KeyError:
         import SCons.Defaults
-        action_list = [ SCons.Defaults.SharedCheck,
-                        SCons.Defaults.ShLinkAction,
-                        LibSymlinksAction ]
-        shared_lib = SCons.Builder.Builder(action = action_list,
-                                           emitter = "$SHLIBEMITTER",
-                                           prefix = ShLibPrefixGenerator,
-                                           suffix = ShLibSuffixGenerator,
-                                           target_scanner = ProgramScanner,
-                                           src_suffix = '$SHOBJSUFFIX',
-                                           src_builder = 'SharedObject')
+        action_list = [SCons.Defaults.SharedCheck,
+                       SCons.Defaults.ShLinkAction,
+                       LibSymlinksAction]
+        shared_lib = SCons.Builder.Builder(action=action_list,
+                                           emitter="$SHLIBEMITTER",
+                                           prefix=ShLibPrefixGenerator,
+                                           suffix=ShLibSuffixGenerator,
+                                           target_scanner=ProgramScanner,
+                                           src_suffix='$SHOBJSUFFIX',
+                                           src_builder='SharedObject')
         env['BUILDERS']['SharedLibrary'] = shared_lib
 
     return shared_lib
 
+
 def createLoadableModuleBuilder(env):
     """This is a utility function that creates the LoadableModule
     Builder in an Environment if it is not there already.
@@ -814,20 +868,21 @@ def createLoadableModuleBuilder(env):
         ld_module = env['BUILDERS']['LoadableModule']
     except KeyError:
         import SCons.Defaults
-        action_list = [ SCons.Defaults.SharedCheck,
-                        SCons.Defaults.LdModuleLinkAction,
-                        LibSymlinksAction ]
-        ld_module = SCons.Builder.Builder(action = action_list,
-                                          emitter = "$LDMODULEEMITTER",
-                                          prefix = LdModPrefixGenerator,
-                                          suffix = LdModSuffixGenerator,
-                                          target_scanner = ProgramScanner,
-                                          src_suffix = '$SHOBJSUFFIX',
-                                          src_builder = 'SharedObject')
+        action_list = [SCons.Defaults.SharedCheck,
+                       SCons.Defaults.LdModuleLinkAction,
+                       LibSymlinksAction]
+        ld_module = SCons.Builder.Builder(action=action_list,
+                                          emitter="$LDMODULEEMITTER",
+                                          prefix=LdModPrefixGenerator,
+                                          suffix=LdModSuffixGenerator,
+                                          target_scanner=ProgramScanner,
+                                          src_suffix='$SHOBJSUFFIX',
+                                          src_builder='SharedObject')
         env['BUILDERS']['LoadableModule'] = ld_module
 
     return ld_module
 
+
 def createObjBuilders(env):
     """This is a utility function that creates the StaticObject
     and SharedObject Builders in an Environment if they
@@ -841,34 +896,34 @@ def createObjBuilders(env):
     The return is a 2-tuple of (StaticObject, SharedObject)
     """
 
-
     try:
         static_obj = env['BUILDERS']['StaticObject']
     except KeyError:
-        static_obj = SCons.Builder.Builder(action = {},
-                                           emitter = {},
-                                           prefix = '$OBJPREFIX',
-                                           suffix = '$OBJSUFFIX',
-                                           src_builder = ['CFile', 'CXXFile'],
-                                           source_scanner = SourceFileScanner,
-                                           single_source = 1)
+        static_obj = SCons.Builder.Builder(action={},
+                                           emitter={},
+                                           prefix='$OBJPREFIX',
+                                           suffix='$OBJSUFFIX',
+                                           src_builder=['CFile', 'CXXFile'],
+                                           source_scanner=SourceFileScanner,
+                                           single_source=1)
         env['BUILDERS']['StaticObject'] = static_obj
         env['BUILDERS']['Object'] = static_obj
 
     try:
         shared_obj = env['BUILDERS']['SharedObject']
     except KeyError:
-        shared_obj = SCons.Builder.Builder(action = {},
-                                           emitter = {},
-                                           prefix = '$SHOBJPREFIX',
-                                           suffix = '$SHOBJSUFFIX',
-                                           src_builder = ['CFile', 'CXXFile'],
-                                           source_scanner = SourceFileScanner,
-                                           single_source = 1)
+        shared_obj = SCons.Builder.Builder(action={},
+                                           emitter={},
+                                           prefix='$SHOBJPREFIX',
+                                           suffix='$SHOBJSUFFIX',
+                                           src_builder=['CFile', 'CXXFile'],
+                                           source_scanner=SourceFileScanner,
+                                           single_source=1)
         env['BUILDERS']['SharedObject'] = shared_obj
 
     return (static_obj, shared_obj)
 
+
 def createCFileBuilders(env):
     """This is a utility function that creates the CFile/CXXFile
     Builders in an Environment if they
@@ -885,95 +940,109 @@ def createCFileBuilders(env):
     try:
         c_file = env['BUILDERS']['CFile']
     except KeyError:
-        c_file = SCons.Builder.Builder(action = {},
-                                       emitter = {},
-                                       suffix = {None:'$CFILESUFFIX'})
+        c_file = SCons.Builder.Builder(action={},
+                                       emitter={},
+                                       suffix={None: '$CFILESUFFIX'})
         env['BUILDERS']['CFile'] = c_file
 
-        env.SetDefault(CFILESUFFIX = '.c')
+        env.SetDefault(CFILESUFFIX='.c')
 
     try:
         cxx_file = env['BUILDERS']['CXXFile']
     except KeyError:
-        cxx_file = SCons.Builder.Builder(action = {},
-                                         emitter = {},
-                                         suffix = {None:'$CXXFILESUFFIX'})
+        cxx_file = SCons.Builder.Builder(action={},
+                                         emitter={},
+                                         suffix={None: '$CXXFILESUFFIX'})
         env['BUILDERS']['CXXFile'] = cxx_file
-        env.SetDefault(CXXFILESUFFIX = '.cc')
+        env.SetDefault(CXXFILESUFFIX='.cc')
 
     return (c_file, cxx_file)
 
+
 ##########################################################################
 #  Create common Java builders
 
 def CreateJarBuilder(env):
+    """The Jar builder expects a list of class files
+    which it can package into a jar file.
+
+    The jar tool provides an interface for passing other types
+    of java files such as .java, directories or swig interfaces
+    and will build them to class files in which it can package
+    into the jar.
+    """
     try:
-        java_jar = env['BUILDERS']['Jar']
+        java_jar = env['BUILDERS']['JarFile']
     except KeyError:
         fs = SCons.Node.FS.get_default_fs()
         jar_com = SCons.Action.Action('$JARCOM', '$JARCOMSTR')
-        java_jar = SCons.Builder.Builder(action = jar_com,
-                                         suffix = '$JARSUFFIX',
-                                         src_suffix = '$JAVACLASSSUFFIX',
-                                         src_builder = 'JavaClassFile',
-                                         source_factory = fs.Entry)
-        env['BUILDERS']['Jar'] = java_jar
+        java_jar = SCons.Builder.Builder(action=jar_com,
+                                         suffix='$JARSUFFIX',
+                                         src_suffix='$JAVACLASSSUFFIX',
+                                         src_builder='JavaClassFile',
+                                         source_factory=fs.Entry)
+        env['BUILDERS']['JarFile'] = java_jar
     return java_jar
 
+
 def CreateJavaHBuilder(env):
     try:
         java_javah = env['BUILDERS']['JavaH']
     except KeyError:
         fs = SCons.Node.FS.get_default_fs()
         java_javah_com = SCons.Action.Action('$JAVAHCOM', '$JAVAHCOMSTR')
-        java_javah = SCons.Builder.Builder(action = java_javah_com,
-                                           src_suffix = '$JAVACLASSSUFFIX',
-                                           target_factory = fs.Entry,
-                                           source_factory = fs.File,
-                                           src_builder = 'JavaClassFile')
+        java_javah = SCons.Builder.Builder(action=java_javah_com,
+                                           src_suffix='$JAVACLASSSUFFIX',
+                                           target_factory=fs.Entry,
+                                           source_factory=fs.File,
+                                           src_builder='JavaClassFile')
         env['BUILDERS']['JavaH'] = java_javah
     return java_javah
 
+
 def CreateJavaClassFileBuilder(env):
     try:
         java_class_file = env['BUILDERS']['JavaClassFile']
     except KeyError:
         fs = SCons.Node.FS.get_default_fs()
         javac_com = SCons.Action.Action('$JAVACCOM', '$JAVACCOMSTR')
-        java_class_file = SCons.Builder.Builder(action = javac_com,
-                                                emitter = {},
-                                                #suffix = '$JAVACLASSSUFFIX',
-                                                src_suffix = '$JAVASUFFIX',
-                                                src_builder = ['JavaFile'],
-                                                target_factory = fs.Entry,
-                                                source_factory = fs.File)
+        java_class_file = SCons.Builder.Builder(action=javac_com,
+                                                emitter={},
+                                                # suffix = '$JAVACLASSSUFFIX',
+                                                src_suffix='$JAVASUFFIX',
+                                                src_builder=['JavaFile'],
+                                                target_factory=fs.Entry,
+                                                source_factory=fs.File)
         env['BUILDERS']['JavaClassFile'] = java_class_file
     return java_class_file
 
+
 def CreateJavaClassDirBuilder(env):
     try:
         java_class_dir = env['BUILDERS']['JavaClassDir']
     except KeyError:
         fs = SCons.Node.FS.get_default_fs()
         javac_com = SCons.Action.Action('$JAVACCOM', '$JAVACCOMSTR')
-        java_class_dir = SCons.Builder.Builder(action = javac_com,
-                                               emitter = {},
-                                               target_factory = fs.Dir,
-                                               source_factory = fs.Dir)
+        java_class_dir = SCons.Builder.Builder(action=javac_com,
+                                               emitter={},
+                                               target_factory=fs.Dir,
+                                               source_factory=fs.Dir)
         env['BUILDERS']['JavaClassDir'] = java_class_dir
     return java_class_dir
 
+
 def CreateJavaFileBuilder(env):
     try:
         java_file = env['BUILDERS']['JavaFile']
     except KeyError:
-        java_file = SCons.Builder.Builder(action = {},
-                                          emitter = {},
-                                          suffix = {None:'$JAVASUFFIX'})
+        java_file = SCons.Builder.Builder(action={},
+                                          emitter={},
+                                          suffix={None: '$JAVASUFFIX'})
         env['BUILDERS']['JavaFile'] = java_file
         env['JAVASUFFIX'] = '.java'
     return java_file
 
+
 class ToolInitializerMethod(object):
     """
     This is added to a construction environment in place of a
@@ -984,6 +1053,7 @@ class ToolInitializerMethod(object):
     whatever builder was (presumably) added to the construction
     environment in place of this particular instance.
     """
+
     def __init__(self, name, initializer):
         """
         Note:  we store the tool name as __name__ so it can be used by
@@ -1022,6 +1092,7 @@ class ToolInitializerMethod(object):
             return [], []
         return builder(*args, **kw)
 
+
 class ToolInitializer(object):
     """
     A class for delayed initialization of Tools modules.
@@ -1033,6 +1104,7 @@ class ToolInitializer(object):
     ToolInitializerMethod objects for the various Builder methods
     that we want to use to delay Tool searches until necessary.
     """
+
     def __init__(self, env, tools, names):
         if not SCons.Util.is_List(tools):
             tools = [tools]
@@ -1067,24 +1139,30 @@ class ToolInitializer(object):
                 env.Tool(tool)
                 return
 
-	# If we fall through here, there was no tool module found.
-	# This is where we can put an informative error message
-	# about the inability to find the tool.   We'll start doing
-	# this as we cut over more pre-defined Builder+Tools to use
-	# the ToolInitializer class.
+        # If we fall through here, there was no tool module found.
+        # This is where we can put an informative error message
+        # about the inability to find the tool.   We'll start doing
+        # this as we cut over more pre-defined Builder+Tools to use
+        # the ToolInitializer class.
+
 
 def Initializers(env):
     ToolInitializer(env, ['install'], ['_InternalInstall', '_InternalInstallAs', '_InternalInstallVersionedLib'])
+
     def Install(self, *args, **kw):
         return self._InternalInstall(*args, **kw)
+
     def InstallAs(self, *args, **kw):
         return self._InternalInstallAs(*args, **kw)
+
     def InstallVersionedLib(self, *args, **kw):
         return self._InternalInstallVersionedLib(*args, **kw)
+
     env.AddMethod(Install)
     env.AddMethod(InstallAs)
     env.AddMethod(InstallVersionedLib)
 
+
 def FindTool(tools, env):
     for tool in tools:
         t = Tool(tool)
@@ -1092,14 +1170,16 @@ def FindTool(tools, env):
             return tool
     return None
 
+
 def FindAllTools(tools, env):
     def ToolExists(tool, env=env):
         return Tool(tool).exists(env)
-    return list(filter (ToolExists, tools))
 
-def tool_list(platform, env):
+    return list(filter(ToolExists, tools))
+
 
-    other_plat_tools=[]
+def tool_list(platform, env):
+    other_plat_tools = []
     # XXX this logic about what tool to prefer on which platform
     #     should be moved into either the platform files or
     #     the tool files themselves.
@@ -1107,21 +1187,21 @@ def tool_list(platform, env):
     # change these search orders, update the man page as well.
     if str(platform) == 'win32':
         "prefer Microsoft tools on Windows"
-        linkers = ['mslink', 'gnulink', 'ilink', 'linkloc', 'ilink32' ]
-        c_compilers = ['msvc', 'mingw', 'gcc', 'intelc', 'icl', 'icc', 'cc', 'bcc32' ]
-        cxx_compilers = ['msvc', 'intelc', 'icc', 'g++', 'cxx', 'bcc32' ]
-        assemblers = ['masm', 'nasm', 'gas', '386asm' ]
+        linkers = ['mslink', 'gnulink', 'ilink', 'linkloc', 'ilink32']
+        c_compilers = ['msvc', 'mingw', 'gcc', 'intelc', 'icl', 'icc', 'cc', 'bcc32']
+        cxx_compilers = ['msvc', 'intelc', 'icc', 'g++', 'cxx', 'bcc32']
+        assemblers = ['masm', 'nasm', 'gas', '386asm']
         fortran_compilers = ['gfortran', 'g77', 'ifl', 'cvf', 'f95', 'f90', 'fortran']
         ars = ['mslib', 'ar', 'tlib']
         other_plat_tools = ['msvs', 'midl']
     elif str(platform) == 'os2':
         "prefer IBM tools on OS/2"
-        linkers = ['ilink', 'gnulink', ]#'mslink']
-        c_compilers = ['icc', 'gcc',]# 'msvc', 'cc']
-        cxx_compilers = ['icc', 'g++',]# 'msvc', 'cxx']
-        assemblers = ['nasm',]# 'masm', 'gas']
+        linkers = ['ilink', 'gnulink', ]  # 'mslink']
+        c_compilers = ['icc', 'gcc', ]  # 'msvc', 'cc']
+        cxx_compilers = ['icc', 'g++', ]  # 'msvc', 'cxx']
+        assemblers = ['nasm', ]  # 'masm', 'gas']
         fortran_compilers = ['ifl', 'g77']
-        ars = ['ar',]# 'mslib']
+        ars = ['ar', ]  # 'mslib']
     elif str(platform) == 'irix':
         "prefer MIPSPro on IRIX"
         linkers = ['sgilink', 'gnulink']
@@ -1174,11 +1254,11 @@ def tool_list(platform, env):
     else:
         "prefer GNU tools on all other platforms"
         linkers = ['gnulink', 'ilink']
-        c_compilers = ['gcc',  'intelc', 'icc', 'cc']
+        c_compilers = ['gcc', 'intelc', 'icc', 'cc']
         cxx_compilers = ['g++', 'intelc', 'icc', 'cxx']
         assemblers = ['gas', 'nasm', 'masm']
         fortran_compilers = ['gfortran', 'g77', 'ifort', 'ifl', 'f95', 'f90', 'f77']
-        ars = ['ar',]
+        ars = ['ar', ]
 
     if not str(platform) == 'win32':
         other_plat_tools += ['m4', 'rpm']
@@ -1210,22 +1290,24 @@ def tool_list(platform, env):
     d_compiler = FindTool(d_compilers, env) or d_compilers[0]
 
     other_tools = FindAllTools(other_plat_tools + [
-                               #TODO: merge 'install' into 'filesystem' and
-                               # make 'filesystem' the default
-                               'filesystem',
-                               'wix', #'midl', 'msvs',
-                               # Parser generators
-                               'lex', 'yacc',
-                               # Foreign function interface
-                               'rpcgen', 'swig',
-                               # Java
-                               'jar', 'javac', 'javah', 'rmic',
-                               # TeX
-                               'dvipdf', 'dvips', 'gs',
-                               'tex', 'latex', 'pdflatex', 'pdftex',
-                               # Archivers
-                               'tar', 'zip',
-                               ], env)
+        # TODO: merge 'install' into 'filesystem' and
+        # make 'filesystem' the default
+        'filesystem',
+        'wix',  # 'midl', 'msvs',
+        # Parser generators
+        'lex', 'yacc',
+        # Foreign function interface
+        'rpcgen', 'swig',
+        # Java
+        'jar', 'javac', 'javah', 'rmic',
+        # TeX
+        'dvipdf', 'dvips', 'gs',
+        'tex', 'latex', 'pdflatex', 'pdftex',
+        # Archivers
+        'tar', 'zip',
+        # File builders (text)
+        'textfile',
+    ], env)
 
     tools = ([linker, c_compiler, cxx_compiler,
               fortran_compiler, assembler, ar, d_compiler]
@@ -1233,6 +1315,33 @@ def tool_list(platform, env):
 
     return [x for x in tools if x]
 
+
+def find_program_path(env, key_program, default_paths=[]):
+    """
+    Find the location of key_program and then return the path it was located at.
+    Checking the default install locations.
+    Mainly for windows where tools aren't all installed in /usr/bin,etc
+    :param env: Current Environment()
+    :param key_program: Program we're using to locate the directory to add to PATH.
+    """
+    # First search in the SCons path
+    path = env.WhereIs(key_program)
+    if (path):
+        return path
+    # then the OS path:
+    path = SCons.Util.WhereIs(key_program)
+    if (path):
+        return path
+
+    # If that doesn't work try default location for mingw
+    save_path = env['ENV']['PATH']
+    for p in default_paths:
+        env.AppendENVPath('PATH', p)
+    path = env.WhereIs(key_program)
+    if not path:
+        env['ENV']['PATH'] = save_path
+    return path
+
 # Local Variables:
 # tab-width:4
 # indent-tabs-mode:nil
diff --git a/src/engine/SCons/Tool/__init__.xml b/src/engine/SCons/Tool/__init__.xml
index 32b8ce6..80fd2f6 100644
--- a/src/engine/SCons/Tool/__init__.xml
+++ b/src/engine/SCons/Tool/__init__.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/aixc++.py b/src/engine/SCons/Tool/aixc++.py
index 0a2465d..be14abc 100644
--- a/src/engine/SCons/Tool/aixc++.py
+++ b/src/engine/SCons/Tool/aixc++.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/aixc++.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/aixc++.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 #forward proxy to the preffered cxx version
 from SCons.Tool.aixcxx import *
diff --git a/src/engine/SCons/Tool/aixc++.xml b/src/engine/SCons/Tool/aixc++.xml
index 04a27f6..0d50ae9 100644
--- a/src/engine/SCons/Tool/aixc++.xml
+++ b/src/engine/SCons/Tool/aixc++.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/aixcc.py b/src/engine/SCons/Tool/aixcc.py
index aa351cd..a1fe216 100644
--- a/src/engine/SCons/Tool/aixcc.py
+++ b/src/engine/SCons/Tool/aixcc.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/aixcc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/aixcc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
diff --git a/src/engine/SCons/Tool/aixcc.xml b/src/engine/SCons/Tool/aixcc.xml
index 44ee0bc..aa0e604 100644
--- a/src/engine/SCons/Tool/aixcc.xml
+++ b/src/engine/SCons/Tool/aixcc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/aixcxx.py b/src/engine/SCons/Tool/aixcxx.py
index 97bd8a6..ec2af1a 100644
--- a/src/engine/SCons/Tool/aixcxx.py
+++ b/src/engine/SCons/Tool/aixcxx.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/aixcxx.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/aixcxx.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
diff --git a/src/engine/SCons/Tool/aixf77.py b/src/engine/SCons/Tool/aixf77.py
index c72346c..6281b13 100644
--- a/src/engine/SCons/Tool/aixf77.py
+++ b/src/engine/SCons/Tool/aixf77.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/aixf77.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/aixf77.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
diff --git a/src/engine/SCons/Tool/aixf77.xml b/src/engine/SCons/Tool/aixf77.xml
index 69f4d92..ee4d232 100644
--- a/src/engine/SCons/Tool/aixf77.xml
+++ b/src/engine/SCons/Tool/aixf77.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/aixlink.py b/src/engine/SCons/Tool/aixlink.py
index fd67d66..ddb4281 100644
--- a/src/engine/SCons/Tool/aixlink.py
+++ b/src/engine/SCons/Tool/aixlink.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/aixlink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/aixlink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
diff --git a/src/engine/SCons/Tool/aixlink.xml b/src/engine/SCons/Tool/aixlink.xml
index d5438ef..0f7fc62 100644
--- a/src/engine/SCons/Tool/aixlink.xml
+++ b/src/engine/SCons/Tool/aixlink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/applelink.py b/src/engine/SCons/Tool/applelink.py
index 45f524c..5981d19 100644
--- a/src/engine/SCons/Tool/applelink.py
+++ b/src/engine/SCons/Tool/applelink.py
@@ -1,6 +1,6 @@
 """SCons.Tool.applelink
 
-Tool-specific initialization for the Apple gnu-like linker.
+Tool-specific initialization for Apple's gnu-like linker.
 
 There normally shouldn't be any need to import this module directly.
 It will usually be imported through the generic SCons.Tool.Tool()
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/applelink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/applelink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
@@ -39,25 +39,162 @@ import SCons.Util
 # the -rpath option, so we use the "link" tool instead of "gnulink".
 from . import link
 
+
+class AppleLinkInvalidCurrentVersionException(Exception):
+    pass
+
+class AppleLinkInvalidCompatibilityVersionException(Exception):
+    pass
+
+
+def _applelib_versioned_lib_suffix(env, suffix, version):
+    """For suffix='.dylib' and version='0.1.2' it returns '.0.1.2.dylib'"""
+    Verbose = False
+    if Verbose:
+        print("_applelib_versioned_lib_suffix: suffix={!r}".format(suffix))
+        print("_applelib_versioned_lib_suffix: version={!r}".format(version))
+    if version not in suffix:
+        suffix = "." + version + suffix
+    if Verbose:
+        print("_applelib_versioned_lib_suffix: return suffix={!r}".format(suffix))
+    return suffix
+
+
+def _applelib_versioned_lib_soname(env, libnode, version, prefix, suffix, name_func):
+    """For libnode='/optional/dir/libfoo.X.Y.Z.dylib' it returns 'libfoo.X.dylib'"""
+    Verbose = False
+    if Verbose:
+        print("_applelib_versioned_lib_soname: version={!r}".format(version))
+    name = name_func(env, libnode, version, prefix, suffix)
+    if Verbose:
+        print("_applelib_versioned_lib_soname: name={!r}".format(name))
+    major = version.split('.')[0]
+    (libname,_suffix) = name.split('.')
+    soname = '.'.join([libname, major, _suffix])
+    if Verbose:
+        print("_applelib_versioned_lib_soname: soname={!r}".format(soname))
+    return soname
+
+def _applelib_versioned_shlib_soname(env, libnode, version, prefix, suffix):
+    return _applelib_versioned_lib_soname(env, libnode, version, prefix, suffix, link._versioned_shlib_name)
+
+
+# User programmatically describes how SHLIBVERSION maps to values for compat/current.
+_applelib_max_version_values = (65535, 255, 255)
+def _applelib_check_valid_version(version_string):
+    """
+    Check that the version # is valid.
+    X[.Y[.Z]]
+    where X 0-65535
+    where Y either not specified or 0-255
+    where Z either not specified or 0-255
+    :param version_string:
+    :return:
+    """
+    parts = version_string.split('.')
+    if len(parts) > 3:
+        return False, "Version string has too many periods [%s]"%version_string
+    if len(parts) <= 0:
+        return False, "Version string unspecified [%s]"%version_string
+
+    for (i, p) in enumerate(parts):
+        try:
+            p_i = int(p)
+        except ValueError:
+            return False, "Version component %s (from %s) is not a number"%(p, version_string)
+        if p_i < 0 or p_i > _applelib_max_version_values[i]:
+            return False, "Version component %s (from %s) is not valid value should be between 0 and %d"%(p, version_string, _applelib_max_version_values[i])
+
+    return True, ""
+
+
+def _applelib_currentVersionFromSoVersion(source, target, env, for_signature):
+    """
+    A generator function to create the -Wl,-current_version flag if needed.
+    If env['APPLELINK_NO_CURRENT_VERSION'] contains a true value no flag will be generated
+    Otherwise if APPLELINK_CURRENT_VERSION is not specified, env['SHLIBVERSION']
+    will be used.
+
+    :param source:
+    :param target:
+    :param env:
+    :param for_signature:
+    :return: A string providing the flag to specify the current_version of the shared library
+    """
+    if env.get('APPLELINK_NO_CURRENT_VERSION', False):
+        return ""
+    elif env.get('APPLELINK_CURRENT_VERSION', False):
+        version_string = env['APPLELINK_CURRENT_VERSION']
+    elif env.get('SHLIBVERSION', False):
+        version_string = env['SHLIBVERSION']
+    else:
+        return ""
+
+    version_string = ".".join(version_string.split('.')[:3])
+
+    valid, reason = _applelib_check_valid_version(version_string)
+    if not valid:
+        raise AppleLinkInvalidCurrentVersionException(reason)
+
+    return "-Wl,-current_version,%s" % version_string
+
+
+def _applelib_compatVersionFromSoVersion(source, target, env, for_signature):
+    """
+    A generator function to create the -Wl,-compatibility_version flag if needed.
+    If env['APPLELINK_NO_COMPATIBILITY_VERSION'] contains a true value no flag will be generated
+    Otherwise if APPLELINK_COMPATIBILITY_VERSION is not specified
+    the first two parts of env['SHLIBVERSION'] will be used with a .0 appended.
+
+    :param source:
+    :param target:
+    :param env:
+    :param for_signature:
+    :return: A string providing the flag to specify the compatibility_version of the shared library
+    """
+    if env.get('APPLELINK_NO_COMPATIBILITY_VERSION', False):
+        return ""
+    elif env.get('APPLELINK_COMPATIBILITY_VERSION', False):
+        version_string = env['APPLELINK_COMPATIBILITY_VERSION']
+    elif env.get('SHLIBVERSION', False):
+        version_string = ".".join(env['SHLIBVERSION'].split('.')[:2] + ['0'])
+    else:
+        return ""
+
+    if version_string is None:
+        return ""
+
+    valid, reason = _applelib_check_valid_version(version_string)
+    if not valid:
+        raise AppleLinkInvalidCompatibilityVersionException(reason)
+
+    return "-Wl,-compatibility_version,%s" % version_string
+
+
 def generate(env):
     """Add Builders and construction variables for applelink to an
     Environment."""
     link.generate(env)
 
     env['FRAMEWORKPATHPREFIX'] = '-F'
-    env['_FRAMEWORKPATH'] = '${_concat(FRAMEWORKPATHPREFIX, FRAMEWORKPATH, "", __env__)}'
+    env['_FRAMEWORKPATH'] = '${_concat(FRAMEWORKPATHPREFIX, FRAMEWORKPATH, "", __env__, RDirs)}'
+
     env['_FRAMEWORKS'] = '${_concat("-framework ", FRAMEWORKS, "", __env__)}'
     env['LINKCOM'] = env['LINKCOM'] + ' $_FRAMEWORKPATH $_FRAMEWORKS $FRAMEWORKSFLAGS'
     env['SHLINKFLAGS'] = SCons.Util.CLVar('$LINKFLAGS -dynamiclib')
     env['SHLINKCOM'] = env['SHLINKCOM'] + ' $_FRAMEWORKPATH $_FRAMEWORKS $FRAMEWORKSFLAGS'
 
 
-    # TODO: Work needed to generate versioned shared libraries
-    # Leaving this commented out, and also going to disable versioned library checking for now
     # see: http://docstore.mik.ua/orelly/unix3/mac/ch05_04.htm  for proper naming
-    #link._setup_versioned_lib_variables(env, tool = 'applelink')#, use_soname = use_soname)
-    #env['LINKCALLBACKS'] = link._versioned_lib_callbacks()
+    link._setup_versioned_lib_variables(env, tool = 'applelink')#, use_soname = use_soname)
+    env['LINKCALLBACKS'] = link._versioned_lib_callbacks()
+    env['LINKCALLBACKS']['VersionedShLibSuffix'] = _applelib_versioned_lib_suffix
+    env['LINKCALLBACKS']['VersionedShLibSoname'] = _applelib_versioned_shlib_soname
 
+    env['_APPLELINK_CURRENT_VERSION'] = _applelib_currentVersionFromSoVersion
+    env['_APPLELINK_COMPATIBILITY_VERSION'] = _applelib_compatVersionFromSoVersion
+    env['_SHLIBVERSIONFLAGS'] = '$_APPLELINK_CURRENT_VERSION $_APPLELINK_COMPATIBILITY_VERSION '
+    env['_LDMODULEVERSIONFLAGS'] = '$_APPLELINK_CURRENT_VERSION $_APPLELINK_COMPATIBILITY_VERSION '
 
     # override the default for loadable modules, which are different
     # on OS X than dynamic shared libs.  echoing what XCode does for
@@ -67,6 +204,8 @@ def generate(env):
     env['LDMODULEFLAGS'] = SCons.Util.CLVar('$LINKFLAGS -bundle')
     env['LDMODULECOM'] = '$LDMODULE -o ${TARGET} $LDMODULEFLAGS $SOURCES $_LIBDIRFLAGS $_LIBFLAGS $_FRAMEWORKPATH $_FRAMEWORKS $FRAMEWORKSFLAGS'
 
+    env['__SHLIBVERSIONFLAGS'] = '${__libversionflags(__env__,"SHLIBVERSION","_SHLIBVERSIONFLAGS")}'
+
 
 
 def exists(env):
diff --git a/src/engine/SCons/Tool/applelink.xml b/src/engine/SCons/Tool/applelink.xml
index 699abf0..c7209fa 100644
--- a/src/engine/SCons/Tool/applelink.xml
+++ b/src/engine/SCons/Tool/applelink.xml
@@ -1,155 +1,254 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
 -->
 
 <!DOCTYPE sconsdoc [
-<!ENTITY % scons SYSTEM '../../../../doc/scons.mod'>
-%scons;
-<!ENTITY % builders-mod SYSTEM '../../../../doc/generated/builders.mod'>
-%builders-mod;
-<!ENTITY % functions-mod SYSTEM '../../../../doc/generated/functions.mod'>
-%functions-mod;
-<!ENTITY % tools-mod SYSTEM '../../../../doc/generated/tools.mod'>
-%tools-mod;
-<!ENTITY % variables-mod SYSTEM '../../../../doc/generated/variables.mod'>
-%variables-mod;
-]>
+        <!ENTITY % scons SYSTEM '../../../../doc/scons.mod'>
+        %scons;
+        <!ENTITY % builders-mod SYSTEM '../../../../doc/generated/builders.mod'>
+        %builders-mod;
+        <!ENTITY % functions-mod SYSTEM '../../../../doc/generated/functions.mod'>
+        %functions-mod;
+        <!ENTITY % tools-mod SYSTEM '../../../../doc/generated/tools.mod'>
+        %tools-mod;
+        <!ENTITY % variables-mod SYSTEM '../../../../doc/generated/variables.mod'>
+        %variables-mod;
+        ]>
 
 <sconsdoc xmlns="http://www.scons.org/dbxsd/v1.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
 
-<tool name="applelink">
-<summary>
-<para>
-Sets construction variables for the Apple linker
-(similar to the GNU linker).
-</para>
-</summary>
-<sets>
-<item>FRAMEWORKPATHPREFIX</item>
-<item>_FRAMEWORKPATH</item>
-<item>_FRAMEWORKS</item>
-<item>LINKCOM</item>
-<item>SHLINKFLAGS</item>
-<item>SHLINKCOM</item>
-<item>LDMODULEPREFIX</item>
-<item>LDMODULESUFFIX</item>
-<item>LDMODULEFLAGS</item>
-<item>LDMODULECOM</item>
-</sets>
-<uses>
-<item>FRAMEWORKSFLAGS</item>
-</uses>
-</tool>
-
-<cvar name="FRAMEWORKSFLAGS">">
-<summary>
-<para>
-On Mac OS X with gcc,
-general user-supplied frameworks options to be added at
-the end of a command
-line building a loadable module.
-(This has been largely superseded by
-the &cv-link-FRAMEWORKPATH;, &cv-link-FRAMEWORKPATHPREFIX;,
-&cv-link-FRAMEWORKPREFIX; and &cv-link-FRAMEWORKS; variables
-described above.)
-</para>
-</summary>
-</cvar>
-
-<cvar name="FRAMEWORKS">
-<summary>
-<para>
-On Mac OS X with gcc, a list of the framework names to be linked into a
-program or shared library or bundle.
-The default value is the empty list.
-For example:
-</para>
-
-<example_commands>
- env.AppendUnique(FRAMEWORKS=Split('System Cocoa SystemConfiguration'))
-</example_commands>
-
-</summary>
-</cvar>
-
-<cvar name="FRAMEWORKPREFIX">
-<summary>
-<para>
-On Mac OS X with gcc,
-the prefix to be used for linking in frameworks
-(see &cv-link-FRAMEWORKS;).
-The default value is
-<option>-framework</option>.
-</para>
-</summary>
-</cvar>
-
-<cvar name="_FRAMEWORKS">
-<summary>
-<para>
-On Mac OS X with gcc,
-an automatically-generated construction variable
-containing the linker command-line options
-for linking with FRAMEWORKS.
-</para>
-</summary>
-</cvar>
-
-<cvar name="FRAMEWORKPATH">
-<summary>
-<para>
-On Mac OS X with gcc,
-a list containing the paths to search for frameworks.
-Used by the compiler to find framework-style includes like
-#include &lt;Fmwk/Header.h&gt;.
-Used by the linker to find user-specified frameworks when linking (see
-&cv-link-FRAMEWORKS;).
-For example:
-</para>
-
-<example_commands>
- env.AppendUnique(FRAMEWORKPATH='#myframeworkdir')
-</example_commands>
-
-<para>
-will add
-</para>
-
-<example_commands>
-  ... -Fmyframeworkdir
-</example_commands>
-
-<para>
-to the compiler and linker command lines.
-</para>
-</summary>
-</cvar>
-
-<cvar name="FRAMEWORKPATHPREFIX">
-<summary>
-<para>
-On Mac OS X with gcc, the prefix to be used for the FRAMEWORKPATH entries.
-(see &cv-link-FRAMEWORKPATH;).
-The default value is
-<option>-F</option>.
-</para>
-</summary>
-</cvar>
-
-<cvar name="_FRAMEWORKPATH">
-<summary>
-<para>
-On Mac OS X with gcc, an automatically-generated construction variable
-containing the linker command-line options corresponding to
-&cv-link-FRAMEWORKPATH;.
-</para>
-</summary>
-</cvar>
+    <tool name="applelink">
+        <summary>
+            <para>
+                Sets construction variables for the Apple linker
+                (similar to the GNU linker).
+            </para>
+        </summary>
+        <sets>
+            <item>FRAMEWORKPATHPREFIX</item>
+            <item>_FRAMEWORKPATH</item>
+            <item>_FRAMEWORKS</item>
+            <item>LINKCOM</item>
+            <item>SHLINKFLAGS</item>
+            <item>SHLINKCOM</item>
+            <item>LDMODULEPREFIX</item>
+            <item>LDMODULESUFFIX</item>
+            <item>LDMODULEFLAGS</item>
+            <item>LDMODULECOM</item>
+            <item>APPLELINK_CURRENT_VERSION</item>
+            <item>APPLELINK_COMPATIBILITY_VERSION</item>
+            <item>APPLELINK_NO_CURRENT_VERSION</item>
+            <item>APPLELINK_NO_COMPATIBILITY_VERSION</item>
+            <item>_APPLELINK_CURRENT_VERSION</item>
+            <item>_APPLELINK_COMPATIBILITY_VERSION</item>
+        </sets>
+        <uses>
+            <item>FRAMEWORKSFLAGS</item>
+        </uses>
+    </tool>
+
+
+    <cvar name="APPLELINK_COMPATIBILITY_VERSION">
+        <summary>
+            <para>
+                On Mac OS X this is used to set the linker flag:
+
+                -compatibility_version
+            </para>
+            <para>
+                The value is specified as X[.Y[.Z]] where X is between 1 and 65535, Y can be omitted or between 1 and
+                255, Z can be omitted or between 1 and 255. This value will be derived from &cv-link-SHLIBVERSION; if
+                not
+                specified. The lowest digit will be dropped and replaced by a 0.
+            </para>
+            <para>
+                If the &cv-link-APPLELINK_NO_COMPATIBILITY_VERSION; is set then no -compatibility_version will be
+                output.
+            </para>
+            <para>See MacOS's ld manpage for more details</para>
+        </summary>
+    </cvar>
+
+    <cvar name="APPLELINK_NO_COMPATIBILITY_VERSION">
+        <summary>
+            <para>
+                Set this to any True (1|True|non-empty string) value to disable adding -compatibility_version flag when
+                generating versioned shared libraries.
+            </para>
+            <para>
+                This overrides &cv-link-APPLELINK_COMPATIBILITY_VERSION;.
+            </para>
+        </summary>
+    </cvar>
+
+
+    <cvar name="_APPLELINK_COMPATIBILITY_VERSION">
+        <summary>
+            <para>
+                A macro (by default a generator function) used to create the linker flags to specify
+                apple's linker's -compatibility_version flag.
+                The default generator uses &cv-link-APPLELINK_COMPATIBILITY_VERSION;
+                and &cv-link-APPLELINK_NO_COMPATIBILITY_VERSION; and  &cv-link-SHLIBVERSION;
+                to determine the correct flag.
+            </para>
+        </summary>
+    </cvar>
+
+
+    <cvar name="APPLELINK_CURRENT_VERSION">
+        <summary>
+            <para>
+                On Mac OS X this is used to set the linker flag:
+
+                -current_version
+            </para>
+            <para>
+                The value is specified as X[.Y[.Z]] where X is between 1 and 65535, Y can be omitted or between 1 and
+                255, Z can be omitted or between 1 and 255. This value will be set to &cv-link-SHLIBVERSION; if not
+                specified.
+            </para>
+            <para>
+                If the &cv-link-APPLELINK_NO_CURRENT_VERSION; is set then no -current_version will be
+                output.
+            </para>
+            <para>See MacOS's ld manpage for more details</para>
+
+        </summary>
+    </cvar>
+
+
+    <cvar name="APPLELINK_NO_CURRENT_VERSION">
+        <summary>
+            <para>
+                Set this to any True (1|True|non-empty string) value to disable adding -current_version flag when
+                generating versioned shared libraries.
+            </para>
+            <para>
+                This overrides &cv-link-APPLELINK_CURRENT_VERSION;.
+            </para>
+        </summary>
+    </cvar>
+
+    <cvar name="_APPLELINK_CURRENT_VERSION">
+        <summary>
+            <para>
+                A macro (by default a generator function) used to create the linker flags to specify apple's linker's
+                -current_version flag.  The default generator uses &cv-link-APPLELINK_CURRENT_VERSION; and
+                &cv-link-APPLELINK_NO_CURRENT_VERSION; and  &cv-link-SHLIBVERSION; to determine the correct flag.
+            </para>
+        </summary>
+    </cvar>
+
+
+    <cvar name="FRAMEWORKSFLAGS">">
+        <summary>
+            <para>
+                On Mac OS X with gcc,
+                general user-supplied frameworks options to be added at
+                the end of a command
+                line building a loadable module.
+                (This has been largely superseded by
+                the &cv-link-FRAMEWORKPATH;, &cv-link-FRAMEWORKPATHPREFIX;,
+                &cv-link-FRAMEWORKPREFIX; and &cv-link-FRAMEWORKS; variables
+                described above.)
+            </para>
+        </summary>
+    </cvar>
+
+    <cvar name="FRAMEWORKS">
+        <summary>
+            <para>
+                On Mac OS X with gcc, a list of the framework names to be linked into a
+                program or shared library or bundle.
+                The default value is the empty list.
+                For example:
+            </para>
+
+            <example_commands>
+                env.AppendUnique(FRAMEWORKS=Split('System Cocoa SystemConfiguration'))
+            </example_commands>
+
+        </summary>
+    </cvar>
+
+    <cvar name="FRAMEWORKPREFIX">
+        <summary>
+            <para>
+                On Mac OS X with gcc,
+                the prefix to be used for linking in frameworks
+                (see &cv-link-FRAMEWORKS;).
+                The default value is
+                <option>-framework</option>.
+            </para>
+        </summary>
+    </cvar>
+
+    <cvar name="_FRAMEWORKS">
+        <summary>
+            <para>
+                On Mac OS X with gcc,
+                an automatically-generated construction variable
+                containing the linker command-line options
+                for linking with FRAMEWORKS.
+            </para>
+        </summary>
+    </cvar>
+
+    <cvar name="FRAMEWORKPATH">
+        <summary>
+            <para>
+                On Mac OS X with gcc,
+                a list containing the paths to search for frameworks.
+                Used by the compiler to find framework-style includes like
+                #include &lt;Fmwk/Header.h&gt;.
+                Used by the linker to find user-specified frameworks when linking (see
+                &cv-link-FRAMEWORKS;).
+                For example:
+            </para>
+
+            <example_commands>
+                env.AppendUnique(FRAMEWORKPATH='#myframeworkdir')
+            </example_commands>
+
+            <para>
+                will add
+            </para>
+
+            <example_commands>
+                ... -Fmyframeworkdir
+            </example_commands>
+
+            <para>
+                to the compiler and linker command lines.
+            </para>
+        </summary>
+    </cvar>
+
+    <cvar name="FRAMEWORKPATHPREFIX">
+        <summary>
+            <para>
+                On Mac OS X with gcc, the prefix to be used for the FRAMEWORKPATH entries.
+                (see &cv-link-FRAMEWORKPATH;).
+                The default value is
+                <option>-F</option>.
+            </para>
+        </summary>
+    </cvar>
+
+    <cvar name="_FRAMEWORKPATH">
+        <summary>
+            <para>
+                On Mac OS X with gcc, an automatically-generated construction variable
+                containing the linker command-line options corresponding to
+                &cv-link-FRAMEWORKPATH;.
+            </para>
+        </summary>
+    </cvar>
 
 </sconsdoc>
diff --git a/src/engine/SCons/Tool/ar.py b/src/engine/SCons/Tool/ar.py
index 4d2a005..bef719f 100644
--- a/src/engine/SCons/Tool/ar.py
+++ b/src/engine/SCons/Tool/ar.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ar.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ar.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/ar.xml b/src/engine/SCons/Tool/ar.xml
index 9b9e0a0..573c80b 100644
--- a/src/engine/SCons/Tool/ar.xml
+++ b/src/engine/SCons/Tool/ar.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/as.py b/src/engine/SCons/Tool/as.py
index ab81b89..8deea59 100644
--- a/src/engine/SCons/Tool/as.py
+++ b/src/engine/SCons/Tool/as.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/as.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/as.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/as.xml b/src/engine/SCons/Tool/as.xml
index f4d886d..c2d1814 100644
--- a/src/engine/SCons/Tool/as.xml
+++ b/src/engine/SCons/Tool/as.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/bcc32.py b/src/engine/SCons/Tool/bcc32.py
index bf0a5dd..1cb0a38 100644
--- a/src/engine/SCons/Tool/bcc32.py
+++ b/src/engine/SCons/Tool/bcc32.py
@@ -5,7 +5,7 @@ XXX
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ XXX
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/bcc32.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/bcc32.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
diff --git a/src/engine/SCons/Tool/bcc32.xml b/src/engine/SCons/Tool/bcc32.xml
index 6163016..b2d8394 100644
--- a/src/engine/SCons/Tool/bcc32.xml
+++ b/src/engine/SCons/Tool/bcc32.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/c++.py b/src/engine/SCons/Tool/c++.py
index ebfe0a4..e670d0d 100644
--- a/src/engine/SCons/Tool/c++.py
+++ b/src/engine/SCons/Tool/c++.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/c++.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/c++.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 #forward proxy to the preffered cxx version
diff --git a/src/engine/SCons/Tool/c++.xml b/src/engine/SCons/Tool/c++.xml
index e2021fc..c10438a 100644
--- a/src/engine/SCons/Tool/c++.xml
+++ b/src/engine/SCons/Tool/c++.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/cc.py b/src/engine/SCons/Tool/cc.py
index 31e7b2b..9b604c4 100644
--- a/src/engine/SCons/Tool/cc.py
+++ b/src/engine/SCons/Tool/cc.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/cc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/cc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Tool
 import SCons.Defaults
diff --git a/src/engine/SCons/Tool/cc.xml b/src/engine/SCons/Tool/cc.xml
index 1ec3084..735f700 100644
--- a/src/engine/SCons/Tool/cc.xml
+++ b/src/engine/SCons/Tool/cc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/clang.py b/src/engine/SCons/Tool/clang.py
index 1271378..69cbbb6 100644
--- a/src/engine/SCons/Tool/clang.py
+++ b/src/engine/SCons/Tool/clang.py
@@ -11,7 +11,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-# __revision__ = "src/engine/SCons/Tool/clang.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+# __revision__ = "src/engine/SCons/Tool/clang.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 # Based on SCons/Tool/gcc.py by Paweł Tomulik 2014 as a separate tool.
 # Brought into the SCons mainline by Russel Winder 2017.
@@ -45,6 +45,8 @@ import sys
 
 import SCons.Util
 import SCons.Tool.cc
+from SCons.Tool.clangCommon import get_clang_install_dirs
+
 
 compilers = ['clang']
 
@@ -52,11 +54,20 @@ def generate(env):
     """Add Builders and construction variables for clang to an Environment."""
     SCons.Tool.cc.generate(env)
 
+    if env['PLATFORM'] == 'win32':
+        # Ensure that we have a proper path for clang
+        clang = SCons.Tool.find_program_path(env, compilers[0], 
+                                             default_paths=get_clang_install_dirs(env['PLATFORM']))
+        if clang:
+            clang_bin_dir = os.path.dirname(clang)
+            env.AppendENVPath('PATH', clang_bin_dir)
+
     env['CC'] = env.Detect(compilers) or 'clang'
     if env['PLATFORM'] in ['cygwin', 'win32']:
         env['SHCCFLAGS'] = SCons.Util.CLVar('$CCFLAGS')
     else:
         env['SHCCFLAGS'] = SCons.Util.CLVar('$CCFLAGS -fPIC')
+
     # determine compiler version
     if env['CC']:
         #pipe = SCons.Action._subproc(env, [env['CC'], '-dumpversion'],
diff --git a/src/engine/SCons/Tool/clang.xml b/src/engine/SCons/Tool/clang.xml
index 3086a51..a546946 100644
--- a/src/engine/SCons/Tool/clang.xml
+++ b/src/engine/SCons/Tool/clang.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/clangCommon/__init__.py b/src/engine/SCons/Tool/clangCommon/__init__.py
new file mode 100644
index 0000000..37efbf6
--- /dev/null
+++ b/src/engine/SCons/Tool/clangCommon/__init__.py
@@ -0,0 +1,17 @@
+"""
+Common routines and data for clang tools
+"""
+
+clang_win32_dirs = [
+    r'C:\Program Files\LLVM\bin',
+    r'C:\cygwin64\bin',
+    r'C:\msys64',
+    r'C:\cygwin\bin',
+    r'C:\msys',
+]
+
+def get_clang_install_dirs(platform):
+    if platform == 'win32':
+        return clang_win32_dirs
+    else:
+        return []
+\ No newline at end of file
diff --git a/src/engine/SCons/Tool/clangxx.py b/src/engine/SCons/Tool/clangxx.py
index f56c9e5..7899228 100644
--- a/src/engine/SCons/Tool/clangxx.py
+++ b/src/engine/SCons/Tool/clangxx.py
@@ -11,7 +11,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-# __revision__ = "src/engine/SCons/Tool/clangxx.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+# __revision__ = "src/engine/SCons/Tool/clangxx.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 # Based on SCons/Tool/g++.py by Paweł Tomulik 2014 as a separate tool.
 # Brought into the SCons mainline by Russel Winder 2017.
@@ -46,6 +46,8 @@ import sys
 import SCons.Tool
 import SCons.Util
 import SCons.Tool.cxx
+from SCons.Tool.clangCommon import get_clang_install_dirs
+
 
 compilers = ['clang++']
 
@@ -66,13 +68,22 @@ def generate(env):
         env['SHOBJSUFFIX'] = '.pic.o'
     elif env['PLATFORM'] == 'sunos':
         env['SHOBJSUFFIX'] = '.pic.o'
+    elif env['PLATFORM'] == 'win32':
+        # Ensure that we have a proper path for clang++
+        clangxx = SCons.Tool.find_program_path(env, compilers[0], default_paths=get_clang_install_dirs(env['PLATFORM']))
+        if clangxx:
+            clangxx_bin_dir = os.path.dirname(clangxx)
+            env.AppendENVPath('PATH', clangxx_bin_dir)
+
     # determine compiler version
     if env['CXX']:
         pipe = SCons.Action._subproc(env, [env['CXX'], '--version'],
                                      stdin='devnull',
                                      stderr='devnull',
                                      stdout=subprocess.PIPE)
-        if pipe.wait() != 0: return
+        if pipe.wait() != 0: 
+            return
+        
         # clang -dumpversion is of no use
         line = pipe.stdout.readline()
         if sys.version_info[0] > 2:
diff --git a/src/engine/SCons/Tool/clangxx.xml b/src/engine/SCons/Tool/clangxx.xml
index 309bb63..7372389 100644
--- a/src/engine/SCons/Tool/clangxx.xml
+++ b/src/engine/SCons/Tool/clangxx.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/cvf.py b/src/engine/SCons/Tool/cvf.py
index a785471..bc1e888 100644
--- a/src/engine/SCons/Tool/cvf.py
+++ b/src/engine/SCons/Tool/cvf.py
@@ -5,7 +5,7 @@ Tool-specific initialization for the Compaq Visual Fortran compiler.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ Tool-specific initialization for the Compaq Visual Fortran compiler.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/cvf.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/cvf.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import fortran
 
diff --git a/src/engine/SCons/Tool/cvf.xml b/src/engine/SCons/Tool/cvf.xml
index 1b2c447..b56c23c 100644
--- a/src/engine/SCons/Tool/cvf.xml
+++ b/src/engine/SCons/Tool/cvf.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/cxx.py b/src/engine/SCons/Tool/cxx.py
index 236730f..81a67c7 100644
--- a/src/engine/SCons/Tool/cxx.py
+++ b/src/engine/SCons/Tool/cxx.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/cxx.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/cxx.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
diff --git a/src/engine/SCons/Tool/cyglink.xml b/src/engine/SCons/Tool/cyglink.xml
index 13556e8..a0aefac 100644
--- a/src/engine/SCons/Tool/cyglink.xml
+++ b/src/engine/SCons/Tool/cyglink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/default.py b/src/engine/SCons/Tool/default.py
index 72d3399..e8aa11b 100644
--- a/src/engine/SCons/Tool/default.py
+++ b/src/engine/SCons/Tool/default.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/default.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/default.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Tool
 
diff --git a/src/engine/SCons/Tool/default.xml b/src/engine/SCons/Tool/default.xml
index 3683a10..8e1ed21 100644
--- a/src/engine/SCons/Tool/default.xml
+++ b/src/engine/SCons/Tool/default.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/dmd.py b/src/engine/SCons/Tool/dmd.py
index 1dfb5d7..b281e1c 100644
--- a/src/engine/SCons/Tool/dmd.py
+++ b/src/engine/SCons/Tool/dmd.py
@@ -31,7 +31,7 @@ Lib tool variables:
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -53,7 +53,7 @@ Lib tool variables:
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/dmd.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/dmd.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import subprocess
diff --git a/src/engine/SCons/Tool/dmd.xml b/src/engine/SCons/Tool/dmd.xml
index a06db10..5149503 100644
--- a/src/engine/SCons/Tool/dmd.xml
+++ b/src/engine/SCons/Tool/dmd.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/docbook/__init__.py b/src/engine/SCons/Tool/docbook/__init__.py
index ed63784..d7d10c0 100644
--- a/src/engine/SCons/Tool/docbook/__init__.py
+++ b/src/engine/SCons/Tool/docbook/__init__.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -166,6 +166,8 @@ xsltproc_com_priority = ['xsltproc', 'saxon', 'saxon-xslt', 'xalan']
 #       see: http://saxon.sourceforge.net/
 xsltproc_com = {'xsltproc' : '$DOCBOOK_XSLTPROC $DOCBOOK_XSLTPROCFLAGS -o $TARGET $DOCBOOK_XSL $SOURCE',
                 'saxon' : '$DOCBOOK_XSLTPROC $DOCBOOK_XSLTPROCFLAGS -o $TARGET $DOCBOOK_XSL $SOURCE $DOCBOOK_XSLTPROCPARAMS',
+                # Note if saxon-xslt is version 5.5 the proper arguments are: (swap order of docbook_xsl and source)
+                #  'saxon-xslt' : '$DOCBOOK_XSLTPROC $DOCBOOK_XSLTPROCFLAGS -o $TARGET $SOURCE $DOCBOOK_XSL  $DOCBOOK_XSLTPROCPARAMS',
                 'saxon-xslt' : '$DOCBOOK_XSLTPROC $DOCBOOK_XSLTPROCFLAGS -o $TARGET $DOCBOOK_XSL $SOURCE $DOCBOOK_XSLTPROCPARAMS',
                 'xalan' : '$DOCBOOK_XSLTPROC $DOCBOOK_XSLTPROCFLAGS -q -out $TARGET -xsl $DOCBOOK_XSL -in $SOURCE'}
 xmllint_com = {'xmllint' : '$DOCBOOK_XMLLINT $DOCBOOK_XMLLINTFLAGS --xinclude $SOURCE > $TARGET'}
diff --git a/src/engine/SCons/Tool/docbook/__init__.xml b/src/engine/SCons/Tool/docbook/__init__.xml
index 1994392..3110649 100644
--- a/src/engine/SCons/Tool/docbook/__init__.xml
+++ b/src/engine/SCons/Tool/docbook/__init__.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/docbook/docs/manual.xml b/src/engine/SCons/Tool/docbook/docs/manual.xml
index c129753..64ee925 100644
--- a/src/engine/SCons/Tool/docbook/docs/manual.xml
+++ b/src/engine/SCons/Tool/docbook/docs/manual.xml
@@ -67,7 +67,7 @@ package's <literal>docbook</literal> folder to
 <itemizedlist><listitem><para>the SCons User's Guide, chap. 19.7 "Where to put your custom Builders and Tools" and
 </para>
 </listitem>
-<listitem><para>the SCons Tools Wiki page at <ulink url="http://scons.org/wiki/ToolsIndex">http://scons.org/wiki/ToolsIndex</ulink>.
+<listitem><para>the SCons Tools Wiki page at <ulink url="https://github.com/SCons/scons/wiki/ToolsIndex">http://github.com/SCons/scons/wiki/ToolsIndex</ulink>.
 </para>
 </listitem>
 </itemizedlist>
diff --git a/src/engine/SCons/Tool/dvi.py b/src/engine/SCons/Tool/dvi.py
index 9ec1563..9844e37 100644
--- a/src/engine/SCons/Tool/dvi.py
+++ b/src/engine/SCons/Tool/dvi.py
@@ -5,7 +5,7 @@ Common DVI Builder definition for various other Tool modules that use it.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ Common DVI Builder definition for various other Tool modules that use it.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/dvi.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/dvi.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Builder
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/dvi.xml b/src/engine/SCons/Tool/dvi.xml
index 1ec2ef0..82ff01b 100644
--- a/src/engine/SCons/Tool/dvi.xml
+++ b/src/engine/SCons/Tool/dvi.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/dvipdf.py b/src/engine/SCons/Tool/dvipdf.py
index 339155d..a4d7d93 100644
--- a/src/engine/SCons/Tool/dvipdf.py
+++ b/src/engine/SCons/Tool/dvipdf.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/dvipdf.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/dvipdf.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Defaults
diff --git a/src/engine/SCons/Tool/dvipdf.xml b/src/engine/SCons/Tool/dvipdf.xml
index a5d2018..683ca72 100644
--- a/src/engine/SCons/Tool/dvipdf.xml
+++ b/src/engine/SCons/Tool/dvipdf.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/dvips.py b/src/engine/SCons/Tool/dvips.py
index 95641d6..30a79ba 100644
--- a/src/engine/SCons/Tool/dvips.py
+++ b/src/engine/SCons/Tool/dvips.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/dvips.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/dvips.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Builder
diff --git a/src/engine/SCons/Tool/dvips.xml b/src/engine/SCons/Tool/dvips.xml
index 7f47592..9838db1 100644
--- a/src/engine/SCons/Tool/dvips.xml
+++ b/src/engine/SCons/Tool/dvips.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/f03.py b/src/engine/SCons/Tool/f03.py
index a9f91a8..64b67bf 100644
--- a/src/engine/SCons/Tool/f03.py
+++ b/src/engine/SCons/Tool/f03.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/f03.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/f03.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/f03.xml b/src/engine/SCons/Tool/f03.xml
index e486acf..af9da30 100644
--- a/src/engine/SCons/Tool/f03.xml
+++ b/src/engine/SCons/Tool/f03.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/f08.py b/src/engine/SCons/Tool/f08.py
index eb44487..3c317f5 100644
--- a/src/engine/SCons/Tool/f08.py
+++ b/src/engine/SCons/Tool/f08.py
@@ -11,7 +11,7 @@ selection method.
 from __future__ import absolute_import
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ from __future__ import absolute_import
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/f08.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/f08.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/f08.xml b/src/engine/SCons/Tool/f08.xml
index aac7b66..4c07890 100644
--- a/src/engine/SCons/Tool/f08.xml
+++ b/src/engine/SCons/Tool/f08.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/f77.py b/src/engine/SCons/Tool/f77.py
index afa9a7b..8ff5f5c 100644
--- a/src/engine/SCons/Tool/f77.py
+++ b/src/engine/SCons/Tool/f77.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/f77.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/f77.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Scanner.Fortran
diff --git a/src/engine/SCons/Tool/f77.xml b/src/engine/SCons/Tool/f77.xml
index 210c646..7ce1159 100644
--- a/src/engine/SCons/Tool/f77.xml
+++ b/src/engine/SCons/Tool/f77.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/f90.py b/src/engine/SCons/Tool/f90.py
index f66ed47..6f80821 100644
--- a/src/engine/SCons/Tool/f90.py
+++ b/src/engine/SCons/Tool/f90.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/f90.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/f90.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Scanner.Fortran
diff --git a/src/engine/SCons/Tool/f90.xml b/src/engine/SCons/Tool/f90.xml
index b5f7f13..f8c1854 100644
--- a/src/engine/SCons/Tool/f90.xml
+++ b/src/engine/SCons/Tool/f90.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/f95.py b/src/engine/SCons/Tool/f95.py
index bc5439f..363245c 100644
--- a/src/engine/SCons/Tool/f95.py
+++ b/src/engine/SCons/Tool/f95.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/f95.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/f95.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/f95.xml b/src/engine/SCons/Tool/f95.xml
index f1cb7c2..a575ad0 100644
--- a/src/engine/SCons/Tool/f95.xml
+++ b/src/engine/SCons/Tool/f95.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/filesystem.py b/src/engine/SCons/Tool/filesystem.py
index 6615c31..c3c79ce 100644
--- a/src/engine/SCons/Tool/filesystem.py
+++ b/src/engine/SCons/Tool/filesystem.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/filesystem.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/filesystem.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons
 from SCons.Tool.install import copyFunc
diff --git a/src/engine/SCons/Tool/fortran.py b/src/engine/SCons/Tool/fortran.py
index b99b5e6..c090b00 100644
--- a/src/engine/SCons/Tool/fortran.py
+++ b/src/engine/SCons/Tool/fortran.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/fortran.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/fortran.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import re
 
diff --git a/src/engine/SCons/Tool/fortran.xml b/src/engine/SCons/Tool/fortran.xml
index 3907ce2..0fde8f1 100644
--- a/src/engine/SCons/Tool/fortran.xml
+++ b/src/engine/SCons/Tool/fortran.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -125,7 +125,8 @@ containing the Fortran compiler command-line options
 for specifying directories to be searched for include
 files and module files.
 The value of &cv-link-_FORTRANINCFLAGS; is created
-by prepending/appending &cv-link-INCPREFIX; and &cv-link-INCSUFFIX;
+by respectively prepending and appending
+&cv-link-INCPREFIX; and &cv-link-INCSUFFIX;
 to the beginning and end
 of each directory in &cv-link-FORTRANPATH;.
 </para>
@@ -148,7 +149,7 @@ for module files, as well.
 <para>
 The prefix used to specify a module directory on the Fortran compiler command
 line.
-This will be appended to the beginning of the directory
+This will be prepended to the beginning of the directory
 in the &cv-link-FORTRANMODDIR; construction variables
 when the &cv-link-_FORTRANMODFLAG; variables is automatically generated.
 </para>
@@ -160,7 +161,7 @@ when the &cv-link-_FORTRANMODFLAG; variables is automatically generated.
 <para>
 The suffix used to specify a module directory on the Fortran compiler command
 line.
-This will be appended to the beginning of the directory
+This will be appended to the end of the directory
 in the &cv-link-FORTRANMODDIR; construction variables
 when the &cv-link-_FORTRANMODFLAG; variables is automatically generated.
 </para>
@@ -176,8 +177,8 @@ for specifying the directory location where the Fortran
 compiler should place any module files that happen to get
 generated during compilation.
 The value of &cv-link-_FORTRANMODFLAG; is created
-by prepending/appending &cv-link-FORTRANMODDIRPREFIX; and
-&cv-link-FORTRANMODDIRSUFFIX;
+by respectively prepending and appending
+&cv-link-FORTRANMODDIRPREFIX; and &cv-link-FORTRANMODDIRSUFFIX;
 to the beginning and end of the directory in &cv-link-FORTRANMODDIR;.
 </para>
 </summary>
@@ -250,7 +251,7 @@ through the automatically-generated
 &cv-link-_FORTRANINCFLAGS;
 construction variable,
 which is constructed by
-appending the values of the
+respectively prepending and appending the values of the
 &cv-link-INCPREFIX; and &cv-link-INCSUFFIX;
 construction variables
 to the beginning and end
diff --git a/src/engine/SCons/Tool/g++.py b/src/engine/SCons/Tool/g++.py
index 468fa87..7b3bc50 100644
--- a/src/engine/SCons/Tool/g++.py
+++ b/src/engine/SCons/Tool/g++.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/g++.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/g++.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 #forward proxy to the preffered cxx version
diff --git a/src/engine/SCons/Tool/g++.xml b/src/engine/SCons/Tool/g++.xml
index 6698869..f997540 100644
--- a/src/engine/SCons/Tool/g++.xml
+++ b/src/engine/SCons/Tool/g++.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/g77.py b/src/engine/SCons/Tool/g77.py
index 36b3c43..fac9794 100644
--- a/src/engine/SCons/Tool/g77.py
+++ b/src/engine/SCons/Tool/g77.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/g77.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/g77.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 from SCons.Tool.FortranCommon import add_all_to_env, add_f77_to_env
diff --git a/src/engine/SCons/Tool/g77.xml b/src/engine/SCons/Tool/g77.xml
index ae57994..519dfaf 100644
--- a/src/engine/SCons/Tool/g77.xml
+++ b/src/engine/SCons/Tool/g77.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gas.py b/src/engine/SCons/Tool/gas.py
index 75e5456..d6b3886 100644
--- a/src/engine/SCons/Tool/gas.py
+++ b/src/engine/SCons/Tool/gas.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/gas.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gas.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 try:
     as_module = __import__('as', globals(), locals(), [])
diff --git a/src/engine/SCons/Tool/gas.xml b/src/engine/SCons/Tool/gas.xml
index 95ccf27..9cfe0de 100644
--- a/src/engine/SCons/Tool/gas.xml
+++ b/src/engine/SCons/Tool/gas.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gcc.py b/src/engine/SCons/Tool/gcc.py
index f241c7b..3b4be6d 100644
--- a/src/engine/SCons/Tool/gcc.py
+++ b/src/engine/SCons/Tool/gcc.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/gcc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gcc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import cc
 import os
@@ -42,6 +42,7 @@ import SCons.Util
 
 compilers = ['gcc', 'cc']
 
+
 def generate(env):
     """Add Builders and construction variables for gcc to an Environment."""
 
@@ -59,38 +60,48 @@ def generate(env):
     if version:
         env['CCVERSION'] = version
 
+
 def exists(env):
     # is executable, and is a GNU compiler (or accepts '--version' at least)
     return detect_version(env, env.Detect(env.get('CC', compilers)))
 
+
 def detect_version(env, cc):
     """Return the version of the GNU compiler, or None if it is not a GNU compiler."""
+    version = None
     cc = env.subst(cc)
     if not cc:
-        return None
-    version = None
-    #pipe = SCons.Action._subproc(env, SCons.Util.CLVar(cc) + ['-dumpversion'],
-    pipe = SCons.Action._subproc(env, SCons.Util.CLVar(cc) + ['--version'],
-                                 stdin = 'devnull',
-                                 stderr = 'devnull',
-                                 stdout = subprocess.PIPE)
+        return version
+
     # -dumpversion was added in GCC 3.0.  As long as we're supporting
     # GCC versions older than that, we should use --version and a
     # regular expression.
-    #line = pipe.stdout.read().strip()
-    #if line:
-    #    version = line
-    line = SCons.Util.to_str(pipe.stdout.readline())
+    # pipe = SCons.Action._subproc(env, SCons.Util.CLVar(cc) + ['-dumpversion'],
+    pipe = SCons.Action._subproc(env, SCons.Util.CLVar(cc) + ['--version'],
+                                 stdin='devnull',
+                                 stderr='devnull',
+                                 stdout=subprocess.PIPE)
+    if pipe.wait() != 0:
+        return version
+
+    with pipe.stdout:
+        # -dumpversion variant:
+        # line = pipe.stdout.read().strip()
+        # --version variant:
+        line = SCons.Util.to_str(pipe.stdout.readline())
+        # Non-GNU compiler's output (like AIX xlc's) may exceed the stdout buffer:
+        # So continue with reading to let the child process actually terminate.
+        while SCons.Util.to_str(pipe.stdout.readline()):
+            pass
+
+    # -dumpversion variant:
+    # if line:
+    #     version = line
+    # --version variant:
     match = re.search(r'[0-9]+(\.[0-9]+)+', line)
     if match:
         version = match.group(0)
-    # Non-GNU compiler's output (like AIX xlc's) may exceed the stdout buffer:
-    # So continue with reading to let the child process actually terminate.
-    while SCons.Util.to_str(pipe.stdout.readline()):
-        pass
-    ret = pipe.wait()
-    if ret != 0:
-        return None
+
     return version
 
 # Local Variables:
diff --git a/src/engine/SCons/Tool/gcc.xml b/src/engine/SCons/Tool/gcc.xml
index 17fe2a1..8c29e9d 100644
--- a/src/engine/SCons/Tool/gcc.xml
+++ b/src/engine/SCons/Tool/gcc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gdc.py b/src/engine/SCons/Tool/gdc.py
index f98fabc..d12a7cf 100644
--- a/src/engine/SCons/Tool/gdc.py
+++ b/src/engine/SCons/Tool/gdc.py
@@ -26,7 +26,7 @@ Lib tool variables:
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -48,7 +48,7 @@ Lib tool variables:
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/gdc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gdc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Defaults
diff --git a/src/engine/SCons/Tool/gdc.xml b/src/engine/SCons/Tool/gdc.xml
index 8f71b5d..ea31215 100644
--- a/src/engine/SCons/Tool/gdc.xml
+++ b/src/engine/SCons/Tool/gdc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gettext.xml b/src/engine/SCons/Tool/gettext.xml
index 299184a..fc3af69 100644
--- a/src/engine/SCons/Tool/gettext.xml
+++ b/src/engine/SCons/Tool/gettext.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gettext_tool.py b/src/engine/SCons/Tool/gettext_tool.py
index e500a18..c33de28 100644
--- a/src/engine/SCons/Tool/gettext_tool.py
+++ b/src/engine/SCons/Tool/gettext_tool.py
@@ -2,7 +2,7 @@
 """
 
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,14 +23,26 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/gettext_tool.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gettext_tool.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 #############################################################################
 def generate(env,**kw):
+  import sys
+  import os
   import SCons.Tool
+  from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+  from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+
   from SCons.Tool.GettextCommon \
     import  _translate, tool_list
   for t in tool_list(env['PLATFORM'], env):
+    if sys.platform == 'win32':
+        tool = SCons.Tool.find_program_path(env, t, default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+        if tool:
+            tool_bin_dir = os.path.dirname(tool)
+            env.AppendENVPath('PATH', tool_bin_dir)
+        else:
+            SCons.Warnings.Warning(t + ' tool requested, but binary not found in ENV PATH')
     env.Tool(t)
   env.AddMethod(_translate, 'Translate')
 #############################################################################
diff --git a/src/engine/SCons/Tool/gfortran.py b/src/engine/SCons/Tool/gfortran.py
index 730ad55..37a697e 100644
--- a/src/engine/SCons/Tool/gfortran.py
+++ b/src/engine/SCons/Tool/gfortran.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/gfortran.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gfortran.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
@@ -54,6 +54,8 @@ def generate(env):
         env['INC%sPREFIX' % dialect] = "-I"
         env['INC%sSUFFIX' % dialect] = ""
 
+    env['FORTRANMODDIRPREFIX'] = "-J"
+
 def exists(env):
     return env.Detect('gfortran')
 
diff --git a/src/engine/SCons/Tool/gfortran.xml b/src/engine/SCons/Tool/gfortran.xml
index 926a2c8..4e78495 100644
--- a/src/engine/SCons/Tool/gfortran.xml
+++ b/src/engine/SCons/Tool/gfortran.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gnulink.py b/src/engine/SCons/Tool/gnulink.py
index 56bae9a..7634772 100644
--- a/src/engine/SCons/Tool/gnulink.py
+++ b/src/engine/SCons/Tool/gnulink.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/gnulink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gnulink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/gnulink.xml b/src/engine/SCons/Tool/gnulink.xml
index fce7a55..5ef80eb 100644
--- a/src/engine/SCons/Tool/gnulink.xml
+++ b/src/engine/SCons/Tool/gnulink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gs.py b/src/engine/SCons/Tool/gs.py
index ec5ab27..8ff9065 100644
--- a/src/engine/SCons/Tool/gs.py
+++ b/src/engine/SCons/Tool/gs.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/gs.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gs.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Builder
diff --git a/src/engine/SCons/Tool/gs.xml b/src/engine/SCons/Tool/gs.xml
index 40e6f06..185f1b4 100644
--- a/src/engine/SCons/Tool/gs.xml
+++ b/src/engine/SCons/Tool/gs.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/gxx.py b/src/engine/SCons/Tool/gxx.py
index 709f72b..20445ba 100644
--- a/src/engine/SCons/Tool/gxx.py
+++ b/src/engine/SCons/Tool/gxx.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/gxx.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/gxx.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import re
@@ -45,12 +45,13 @@ from . import cxx
 
 compilers = ['g++']
 
+
 def generate(env):
     """Add Builders and construction variables for g++ to an Environment."""
     static_obj, shared_obj = SCons.Tool.createObjBuilders(env)
 
     if 'CXX' not in env:
-        env['CXX']    = env.Detect(compilers) or compilers[0]
+        env['CXX'] = env.Detect(compilers) or compilers[0]
 
     cxx.generate(env)
 
@@ -68,6 +69,7 @@ def generate(env):
     if version:
         env['CXXVERSION'] = version
 
+
 def exists(env):
     # is executable, and is a GNU compiler (or accepts '--version' at least)
     return gcc.detect_version(env, env.Detect(env.get('CXX', compilers)))
diff --git a/src/engine/SCons/Tool/hpc++.py b/src/engine/SCons/Tool/hpc++.py
index 9471ef5..1528066 100644
--- a/src/engine/SCons/Tool/hpc++.py
+++ b/src/engine/SCons/Tool/hpc++.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/hpc++.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/hpc++.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 #forward proxy to the preffered cxx version
diff --git a/src/engine/SCons/Tool/hpc++.xml b/src/engine/SCons/Tool/hpc++.xml
index d3d11c4..8bb4a65 100644
--- a/src/engine/SCons/Tool/hpc++.xml
+++ b/src/engine/SCons/Tool/hpc++.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/hpcc.py b/src/engine/SCons/Tool/hpcc.py
index 0f6a5b4..2734006 100644
--- a/src/engine/SCons/Tool/hpcc.py
+++ b/src/engine/SCons/Tool/hpcc.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/hpcc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/hpcc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
diff --git a/src/engine/SCons/Tool/hpcc.xml b/src/engine/SCons/Tool/hpcc.xml
index 765860f..f8bece8 100644
--- a/src/engine/SCons/Tool/hpcc.xml
+++ b/src/engine/SCons/Tool/hpcc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/hpcxx.py b/src/engine/SCons/Tool/hpcxx.py
index 847eaca..196777a 100644
--- a/src/engine/SCons/Tool/hpcxx.py
+++ b/src/engine/SCons/Tool/hpcxx.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/hpcxx.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/hpcxx.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
diff --git a/src/engine/SCons/Tool/hplink.py b/src/engine/SCons/Tool/hplink.py
index 2329282..9f38a3b 100644
--- a/src/engine/SCons/Tool/hplink.py
+++ b/src/engine/SCons/Tool/hplink.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/hplink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/hplink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
diff --git a/src/engine/SCons/Tool/hplink.xml b/src/engine/SCons/Tool/hplink.xml
index ffa6c0d..f2b923b 100644
--- a/src/engine/SCons/Tool/hplink.xml
+++ b/src/engine/SCons/Tool/hplink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/icc.py b/src/engine/SCons/Tool/icc.py
index 1f9e8cf..1923c60 100644
--- a/src/engine/SCons/Tool/icc.py
+++ b/src/engine/SCons/Tool/icc.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/icc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/icc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import cc
 
diff --git a/src/engine/SCons/Tool/icc.xml b/src/engine/SCons/Tool/icc.xml
index b0af318..8492fce 100644
--- a/src/engine/SCons/Tool/icc.xml
+++ b/src/engine/SCons/Tool/icc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/icl.py b/src/engine/SCons/Tool/icl.py
index 99410cd..26490f0 100644
--- a/src/engine/SCons/Tool/icl.py
+++ b/src/engine/SCons/Tool/icl.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/icl.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/icl.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Tool.intelc
 
diff --git a/src/engine/SCons/Tool/icl.xml b/src/engine/SCons/Tool/icl.xml
index 035a3a9..31e0bcc 100644
--- a/src/engine/SCons/Tool/icl.xml
+++ b/src/engine/SCons/Tool/icl.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/ifl.py b/src/engine/SCons/Tool/ifl.py
index 116c9ac..e438c44 100644
--- a/src/engine/SCons/Tool/ifl.py
+++ b/src/engine/SCons/Tool/ifl.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ifl.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ifl.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 from SCons.Scanner.Fortran import FortranScan
diff --git a/src/engine/SCons/Tool/ifl.xml b/src/engine/SCons/Tool/ifl.xml
index d693ef6..f78c9fd 100644
--- a/src/engine/SCons/Tool/ifl.xml
+++ b/src/engine/SCons/Tool/ifl.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/ifort.py b/src/engine/SCons/Tool/ifort.py
index 8e88946..d69bd14 100644
--- a/src/engine/SCons/Tool/ifort.py
+++ b/src/engine/SCons/Tool/ifort.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ifort.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ifort.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 from SCons.Scanner.Fortran import FortranScan
diff --git a/src/engine/SCons/Tool/ifort.xml b/src/engine/SCons/Tool/ifort.xml
index 26d4ca9..47a55e3 100644
--- a/src/engine/SCons/Tool/ifort.xml
+++ b/src/engine/SCons/Tool/ifort.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/ilink.py b/src/engine/SCons/Tool/ilink.py
index 577e54b..6c3a072 100644
--- a/src/engine/SCons/Tool/ilink.py
+++ b/src/engine/SCons/Tool/ilink.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ilink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ilink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/ilink.xml b/src/engine/SCons/Tool/ilink.xml
index 941db53..731bdfb 100644
--- a/src/engine/SCons/Tool/ilink.xml
+++ b/src/engine/SCons/Tool/ilink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/ilink32.py b/src/engine/SCons/Tool/ilink32.py
index 3e8e095..7c7e983 100644
--- a/src/engine/SCons/Tool/ilink32.py
+++ b/src/engine/SCons/Tool/ilink32.py
@@ -5,7 +5,7 @@ XXX
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ XXX
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ilink32.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ilink32.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Tool
 import SCons.Tool.bcc32
diff --git a/src/engine/SCons/Tool/ilink32.xml b/src/engine/SCons/Tool/ilink32.xml
index 02343d9..3f273a8 100644
--- a/src/engine/SCons/Tool/ilink32.xml
+++ b/src/engine/SCons/Tool/ilink32.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/install.py b/src/engine/SCons/Tool/install.py
index 12dcf8f..6b5a741 100644
--- a/src/engine/SCons/Tool/install.py
+++ b/src/engine/SCons/Tool/install.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/install.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/install.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import re
diff --git a/src/engine/SCons/Tool/install.xml b/src/engine/SCons/Tool/install.xml
index 139cd1e..da2d4a0 100644
--- a/src/engine/SCons/Tool/install.xml
+++ b/src/engine/SCons/Tool/install.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/intelc.py b/src/engine/SCons/Tool/intelc.py
index 425f221..3429145 100644
--- a/src/engine/SCons/Tool/intelc.py
+++ b/src/engine/SCons/Tool/intelc.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 from __future__ import division, print_function
 
-__revision__ = "src/engine/SCons/Tool/intelc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/intelc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import math, sys, os.path, glob, string, re
 
@@ -73,7 +73,7 @@ def linux_ver_normalize(vstr):
     m = re.match(r'([0-9]+)\.([0-9]+)\.([0-9]+)', vstr)
     if m:
         vmaj,vmin,build = m.groups()
-        return float(vmaj) * 10. + float(vmin) + float(build) / 1000.;
+        return float(vmaj) * 10. + float(vmin) + float(build) / 1000.
     else:
         f = float(vstr)
         if is_windows:
diff --git a/src/engine/SCons/Tool/intelc.xml b/src/engine/SCons/Tool/intelc.xml
index 3ec9ddd..af77186 100644
--- a/src/engine/SCons/Tool/intelc.xml
+++ b/src/engine/SCons/Tool/intelc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/ipkg.py b/src/engine/SCons/Tool/ipkg.py
index 4ad53c9..5685abb 100644
--- a/src/engine/SCons/Tool/ipkg.py
+++ b/src/engine/SCons/Tool/ipkg.py
@@ -11,7 +11,7 @@ packages fake_root.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ packages fake_root.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ipkg.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ipkg.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 
diff --git a/src/engine/SCons/Tool/jar.py b/src/engine/SCons/Tool/jar.py
index a56dd70..5858b2c 100644
--- a/src/engine/SCons/Tool/jar.py
+++ b/src/engine/SCons/Tool/jar.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,10 +31,14 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/jar.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/jar.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
+import os
 
 import SCons.Subst
 import SCons.Util
+from SCons.Node.FS import _my_normcase
+from SCons.Tool.JavaCommon import get_java_install_dirs
+
 
 def jarSources(target, source, env, for_signature):
     """Only include sources that are not a manifest file."""
@@ -50,7 +54,7 @@ def jarSources(target, source, env, for_signature):
     result = []
     for src in source:
         contents = src.get_text_contents()
-        if contents[:16] != "Manifest-Version":
+        if not contents.startswith("Manifest-Version"):
             if jarchdir_set:
                 _chdir = jarchdir
             else:
@@ -71,7 +75,7 @@ def jarManifest(target, source, env, for_signature):
     """Look in sources for a manifest file, if any."""
     for src in source:
         contents = src.get_text_contents()
-        if contents[:16] == "Manifest-Version":
+        if contents.startswith("Manifest-Version"):
             return src
     return ''
 
@@ -81,16 +85,137 @@ def jarFlags(target, source, env, for_signature):
     jarflags = env.subst('$JARFLAGS', target=target, source=source)
     for src in source:
         contents = src.get_text_contents()
-        if contents[:16] == "Manifest-Version":
+        if contents.startswith("Manifest-Version"):
             if not 'm' in jarflags:
                 return jarflags + 'm'
             break
     return jarflags
 
+def Jar(env, target = None, source = [], *args, **kw):
+    """
+    A pseudo-Builder wrapper around the separate Jar sources{File,Dir}
+    Builders.
+    """
+
+    # jar target should not be a list so assume they passed
+    # no target and want implicit target to be made and the arg
+    # was actaully the list of sources
+    if SCons.Util.is_List(target) and source == []:
+        SCons.Warnings.Warning("Making implicit target jar file, " +
+                              "and treating the list as sources")
+        source = target
+        target = None
+
+    # mutiple targets pass so build each target the same from the 
+    # same source
+    #TODO Maybe this should only be done once, and the result copied
+    #     for each target since it should result in the same?
+    if SCons.Util.is_List(target) and SCons.Util.is_List(source):
+        jars = []
+        for single_target in target:
+            jars += env.Jar( target = single_target, source = source, *args, **kw)
+        return jars
+
+    # they passed no target so make a target implicitly
+    if target is None:
+        try:
+            # make target from the first source file
+            target = os.path.splitext(str(source[0]))[0] + env.subst('$JARSUFFIX')
+        except:
+            # something strange is happening but attempt anyways
+            SCons.Warnings.Warning("Could not make implicit target from sources, using directory")
+            target = os.path.basename(str(env.Dir('.'))) + env.subst('$JARSUFFIX')
+
+    # make lists out of our target and sources
+    if not SCons.Util.is_List(target):
+        target = [target]
+    if not SCons.Util.is_List(source):
+        source = [source]
+
+    # setup for checking through all the sources and handle accordingly
+    java_class_suffix = env.subst('$JAVACLASSSUFFIX')
+    java_suffix = env.subst('$JAVASUFFIX')
+    target_nodes = []
+
+    # function for determining what to do with a file and not a directory
+    # if its already a class file then it can be used as a
+    # source for jar, otherwise turn it into a class file then
+    # return the source
+    def file_to_class(s):
+        if _my_normcase(str(s)).endswith(java_suffix):
+            return env.JavaClassFile(source = s, *args, **kw)
+        else:
+            return [env.fs.File(s)]
+
+    # function for calling the JavaClassDir builder if a directory is
+    # passed as a source to Jar builder. The JavaClassDir builder will
+    # return an empty list if there were not target classes built from
+    # the directory, in this case assume the user wanted the directory
+    # copied into the jar as is (it contains other files such as
+    # resources or class files compiled from proir commands)
+    # TODO: investigate the expexcted behavior for directories that
+    #       have mixed content, such as Java files along side other files
+    #       files.
+    def dir_to_class(s):
+        dir_targets = env.JavaClassDir(source = s, *args, **kw)
+        if(dir_targets == []):
+            # no classes files could be built from the source dir
+            # so pass the dir as is.
+            return [env.fs.Dir(s)]
+        else:
+            return dir_targets
+
+    # loop through the sources and handle each accordingly
+    # the goal here is to get all the source files into a class
+    # file or a directory that contains class files
+    for s in SCons.Util.flatten(source):
+        s = env.subst(s)
+        if isinstance(s, SCons.Node.FS.Base):
+            if isinstance(s, SCons.Node.FS.File):
+                # found a file so make sure its a class file
+                target_nodes.extend(file_to_class(s))
+            else:
+                # found a dir so get the class files out of it
+                target_nodes.extend(dir_to_class(s))
+        else:
+            try:
+                # source is string try to convert it to file
+                target_nodes.extend(file_to_class(env.fs.File(s)))
+                continue
+            except:
+                pass
+            
+            try:
+                # source is string try to covnert it to dir
+                target_nodes.extend(dir_to_class(env.fs.Dir(s)))
+                continue
+            except:
+                pass
+
+            SCons.Warnings.Warning("File: " + str(s) + " could not be identified as File or Directory, skipping.")
+            
+    # at this point all our sources have been converted to classes or directories of class
+    # so pass it to the Jar builder
+    return env.JarFile(target = target, source = target_nodes, *args, **kw)
+
 def generate(env):
     """Add Builders and construction variables for jar to an Environment."""
     SCons.Tool.CreateJarBuilder(env)
 
+    SCons.Tool.CreateJavaFileBuilder(env)
+    SCons.Tool.CreateJavaClassFileBuilder(env)
+    SCons.Tool.CreateJavaClassDirBuilder(env)
+
+    env.AddMethod(Jar)
+
+    if env['PLATFORM'] == 'win32':
+        # Ensure that we have a proper path for clang
+        jar = SCons.Tool.find_program_path(env, 'jar',
+                                             default_paths=get_java_install_dirs(env['PLATFORM']))
+        if jar:
+            jar_bin_dir = os.path.dirname(jar)
+            env.AppendENVPath('PATH', jar_bin_dir)
+
     env['JAR']        = 'jar'
     env['JARFLAGS']   = SCons.Util.CLVar('cf')
     env['_JARFLAGS']  = jarFlags
diff --git a/src/engine/SCons/Tool/jar.xml b/src/engine/SCons/Tool/jar.xml
index e18207e..73f6bcb 100644
--- a/src/engine/SCons/Tool/jar.xml
+++ b/src/engine/SCons/Tool/jar.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/javac.py b/src/engine/SCons/Tool/javac.py
index f3cabf3..b5e4aaa 100644
--- a/src/engine/SCons/Tool/javac.py
+++ b/src/engine/SCons/Tool/javac.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,15 +30,16 @@ selection method.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/javac.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/javac.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
+from collections import OrderedDict
 
 import SCons.Action
 import SCons.Builder
 from SCons.Node.FS import _my_normcase
-from SCons.Tool.JavaCommon import parse_java_file
+from SCons.Tool.JavaCommon import parse_java_file, get_java_install_dirs, get_java_include_paths
 import SCons.Util
 
 def classname(path):
@@ -70,7 +71,7 @@ def emit_java_classes(target, source, env):
         if isinstance(entry, SCons.Node.FS.File):
             slist.append(entry)
         elif isinstance(entry, SCons.Node.FS.Dir):
-            result = SCons.Util.OrderedDict()
+            result = OrderedDict()
             dirnode = entry.rdir()
             def find_java_files(arg, dirpath, filenames):
                 java_files = sorted([n for n in filenames
@@ -207,6 +208,21 @@ def generate(env):
 
     env.AddMethod(Java)
 
+    version = env.get('JAVAVERSION', None)
+
+    javac = SCons.Tool.find_program_path(env, 'javac')
+    if env['PLATFORM'] == 'win32':
+        # Ensure that we have a proper path for javac
+        paths=get_java_install_dirs(env['PLATFORM'], version=version)
+        javac = SCons.Tool.find_program_path(env, 'javac',
+                                             default_paths=paths)
+        if javac:
+            javac_bin_dir = os.path.dirname(javac)
+            env.AppendENVPath('PATH', javac_bin_dir)
+
+    env['JAVAINCLUDES'] = get_java_include_paths(env, javac, version)
+
+
     env['JAVAC']                    = 'javac'
     env['JAVACFLAGS']               = SCons.Util.CLVar('')
     env['JAVABOOTCLASSPATH']        = []
diff --git a/src/engine/SCons/Tool/javac.xml b/src/engine/SCons/Tool/javac.xml
index be478ba..dc72f75 100644
--- a/src/engine/SCons/Tool/javac.xml
+++ b/src/engine/SCons/Tool/javac.xml
@@ -1,285 +1,304 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
 -->
 
 <!DOCTYPE sconsdoc [
-<!ENTITY % scons SYSTEM '../../../../doc/scons.mod'>
-%scons;
-<!ENTITY % builders-mod SYSTEM '../../../../doc/generated/builders.mod'>
-%builders-mod;
-<!ENTITY % functions-mod SYSTEM '../../../../doc/generated/functions.mod'>
-%functions-mod;
-<!ENTITY % tools-mod SYSTEM '../../../../doc/generated/tools.mod'>
-%tools-mod;
-<!ENTITY % variables-mod SYSTEM '../../../../doc/generated/variables.mod'>
-%variables-mod;
-]>
+        <!ENTITY % scons SYSTEM '../../../../doc/scons.mod'>
+        %scons;
+        <!ENTITY % builders-mod SYSTEM '../../../../doc/generated/builders.mod'>
+        %builders-mod;
+        <!ENTITY % functions-mod SYSTEM '../../../../doc/generated/functions.mod'>
+        %functions-mod;
+        <!ENTITY % tools-mod SYSTEM '../../../../doc/generated/tools.mod'>
+        %tools-mod;
+        <!ENTITY % variables-mod SYSTEM '../../../../doc/generated/variables.mod'>
+        %variables-mod;
+        ]>
 
 <sconsdoc xmlns="http://www.scons.org/dbxsd/v1.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
 
-<tool name="javac">
-<summary>
-<para>
-Sets construction variables for the &javac; compiler.
-</para>
-</summary>
-<sets>
-<item>JAVAC</item>
-<item>JAVACFLAGS</item>
-<item>JAVACCOM</item>
-<item>JAVACLASSSUFFIX</item>
-<item>JAVASUFFIX</item>
-<item>JAVABOOTCLASSPATH</item>
-<item>JAVACLASSPATH</item>
-<item>JAVASOURCEPATH</item>
-</sets>
-<uses>
-<item>JAVACCOMSTR</item>
-</uses>
-</tool>
+    <tool name="javac">
+        <summary>
+            <para>
+                Sets construction variables for the &javac; compiler.
+            </para>
+        </summary>
+        <sets>
+            <item>JAVAC</item>
+            <item>JAVACFLAGS</item>
+            <item>JAVACCOM</item>
+            <item>JAVACLASSSUFFIX</item>
+            <item>JAVAINCLUDES</item>
+            <item>JAVASUFFIX</item>
+            <item>JAVABOOTCLASSPATH</item>
+            <item>JAVACLASSPATH</item>
+            <item>JAVASOURCEPATH</item>
+        </sets>
+        <uses>
+            <item>JAVACCOMSTR</item>
+        </uses>
+    </tool>
 
-<builder name="Java">
-<summary>
-<para>
-Builds one or more Java class files.
-The sources may be any combination of explicit
-<filename>.java</filename> files,
-or directory trees which will be scanned
-for <filename>.java</filename> files.
-</para>
+    <builder name="Java">
+        <summary>
+            <para>
+                Builds one or more Java class files.
+                The sources may be any combination of explicit
+                <filename>.java</filename>
+                files,
+                or directory trees which will be scanned
+                for <filename>.java</filename> files.
+            </para>
 
-<para>
-SCons will parse each source <filename>.java</filename> file
-to find the classes
-(including inner classes)
-defined within that file,
-and from that figure out the
-target <filename>.class</filename> files that will be created.
-The class files will be placed underneath
-the specified target directory.
-</para>
+            <para>
+                SCons will parse each source <filename>.java</filename> file
+                to find the classes
+                (including inner classes)
+                defined within that file,
+                and from that figure out the
+                target <filename>.class</filename> files that will be created.
+                The class files will be placed underneath
+                the specified target directory.
+            </para>
 
-<para>
-SCons will also search each Java file
-for the Java package name,
-which it assumes can be found on a line
-beginning with the string
-<literal>package</literal>
-in the first column;
-the resulting <filename>.class</filename> files
-will be placed in a directory reflecting
-the specified package name.
-For example,
-the file
-<filename>Foo.java</filename>
-defining a single public
-<classname>Foo</classname>
-class and
-containing a package name of
-<classname>sub.dir</classname>
-will generate a corresponding
-<filename>sub/dir/Foo.class</filename>
-class file.
-</para>
+            <para>
+                SCons will also search each Java file
+                for the Java package name,
+                which it assumes can be found on a line
+                beginning with the string
+                <literal>package</literal>
+                in the first column;
+                the resulting <filename>.class</filename> files
+                will be placed in a directory reflecting
+                the specified package name.
+                For example,
+                the file
+                <filename>Foo.java</filename>
+                defining a single public
+                <classname>Foo</classname>
+                class and
+                containing a package name of
+                <classname>sub.dir</classname>
+                will generate a corresponding
+                <filename>sub/dir/Foo.class</filename>
+                class file.
+            </para>
 
-<para>
-Examples:
-</para>
+            <para>
+                Examples:
+            </para>
 
-<example_commands>
-env.Java(target = 'classes', source = 'src')
-env.Java(target = 'classes', source = ['src1', 'src2'])
-env.Java(target = 'classes', source = ['File1.java', 'File2.java'])
-</example_commands>
+            <example_commands>
+                env.Java(target = 'classes', source = 'src')
+                env.Java(target = 'classes', source = ['src1', 'src2'])
+                env.Java(target = 'classes', source = ['File1.java', 'File2.java'])
+            </example_commands>
 
-<para>
-Java source files can use the native encoding for the underlying OS.
-Since SCons compiles in simple ASCII mode by default,
-the compiler will generate warnings about unmappable characters,
-which may lead to errors as the file is processed further.
-In this case, the user must specify the <literal>LANG</literal>
-environment variable to tell the compiler what encoding is used.
-For portibility, it's best if the encoding is hard-coded
-so that the compile will work if it is done on a system
-with a different encoding.
-</para>
+            <para>
+                Java source files can use the native encoding for the underlying OS.
+                Since SCons compiles in simple ASCII mode by default,
+                the compiler will generate warnings about unmappable characters,
+                which may lead to errors as the file is processed further.
+                In this case, the user must specify the
+                <literal>LANG</literal>
+                environment variable to tell the compiler what encoding is used.
+                For portibility, it's best if the encoding is hard-coded
+                so that the compile will work if it is done on a system
+                with a different encoding.
+            </para>
 
-<example_commands>
-env = Environment()
-env['ENV']['LANG'] = 'en_GB.UTF-8'
-</example_commands>
-</summary>
-</builder>
+            <example_commands>
+                env = Environment()
+                env['ENV']['LANG'] = 'en_GB.UTF-8'
+            </example_commands>
+        </summary>
+    </builder>
 
-<cvar name="JAVABOOTCLASSPATH">
-<summary>
-<para>
-Specifies the list of directories that
-will be added to the
-&javac; command line
-via the <option>-bootclasspath</option> option.
-The individual directory names will be
-separated by the operating system's path separate character
-(<filename>:</filename> on UNIX/Linux/POSIX,
-<filename>;</filename> on Windows).
-</para>
-</summary>
-</cvar>
+    <cvar name="JAVABOOTCLASSPATH">
+        <summary>
+            <para>
+                Specifies the list of directories that
+                will be added to the
+                &javac; command line
+                via the <option>-bootclasspath</option> option.
+                The individual directory names will be
+                separated by the operating system's path separate character
+                (<filename>:</filename> on UNIX/Linux/POSIX,
+                <filename>;</filename>
+                on Windows).
+            </para>
+        </summary>
+    </cvar>
 
-<cvar name="JAVAC">
-<summary>
-<para>
-The Java compiler.
-</para>
-</summary>
-</cvar>
+    <cvar name="JAVAINCLUDES">
+        <summary>
+            <para>
+                Include path for Java header files (such as jni.h)
+            </para>
+        </summary>
+    </cvar>
 
-<cvar name="JAVACCOM">
-<summary>
-<para>
-The command line used to compile a directory tree containing
-Java source files to
-corresponding Java class files.
-Any options specified in the &cv-link-JAVACFLAGS; construction variable
-are included on this command line.
-</para>
-</summary>
-</cvar>
+    <cvar name="JAVAC">
+        <summary>
+            <para>
+                The Java compiler.
+            </para>
+        </summary>
+    </cvar>
 
-<cvar name="JAVACCOMSTR">
-<summary>
-<para>
-The string displayed when compiling
-a directory tree of Java source files to
-corresponding Java class files.
-If this is not set, then &cv-link-JAVACCOM; (the command line) is displayed.
-</para>
+    <cvar name="JAVACCOM">
+        <summary>
+            <para>
+                The command line used to compile a directory tree containing
+                Java source files to
+                corresponding Java class files.
+                Any options specified in the &cv-link-JAVACFLAGS; construction variable
+                are included on this command line.
+            </para>
+        </summary>
+    </cvar>
 
-<example_commands>
-env = Environment(JAVACCOMSTR = "Compiling class files $TARGETS from $SOURCES")
-</example_commands>
-</summary>
-</cvar>
+    <cvar name="JAVACCOMSTR">
+        <summary>
+            <para>
+                The string displayed when compiling
+                a directory tree of Java source files to
+                corresponding Java class files.
+                If this is not set, then &cv-link-JAVACCOM; (the command line) is displayed.
+            </para>
 
-<cvar name="JAVACFLAGS">
-<summary>
-<para>
-General options that are passed to the Java compiler.
-</para>
-</summary>
-</cvar>
+            <example_commands>
+                env = Environment(JAVACCOMSTR = "Compiling class files $TARGETS from $SOURCES")
+            </example_commands>
+        </summary>
+    </cvar>
 
-<cvar name="JAVACLASSDIR">
-<summary>
-<para>
-The directory in which Java class files may be found.
-This is stripped from the beginning of any Java .class
-file names supplied to the
-<literal>JavaH</literal>
-builder.
-</para>
-</summary>
-</cvar>
+    <cvar name="JAVACFLAGS">
+        <summary>
+            <para>
+                General options that are passed to the Java compiler.
+            </para>
+        </summary>
+    </cvar>
 
-<cvar name="JAVACLASSPATH">
-<summary>
-<para>
-Specifies the list of directories that
-will be searched for Java
-<filename>.class</filename> file.
-The directories in this list will be added to the
-&javac; and &javah; command lines
-via the <option>-classpath</option> option.
-The individual directory names will be
-separated by the operating system's path separate character
-(<filename>:</filename> on UNIX/Linux/POSIX,
-<filename>;</filename> on Windows).
-</para>
+    <cvar name="JAVACLASSDIR">
+        <summary>
+            <para>
+                The directory in which Java class files may be found.
+                This is stripped from the beginning of any Java .class
+                file names supplied to the
+                <literal>JavaH</literal>
+                builder.
+            </para>
+        </summary>
+    </cvar>
 
-<para>
-Note that this currently just adds the specified
-directory via the <option>-classpath</option> option.
-&SCons; does not currently search the
-&cv-JAVACLASSPATH; directories for dependency
-<filename>.class</filename> files.
-</para>
-</summary>
-</cvar>
+    <cvar name="JAVACLASSPATH">
+        <summary>
+            <para>
+                Specifies the list of directories that
+                will be searched for Java
+                <filename>.class</filename>
+                file.
+                The directories in this list will be added to the
+                &javac; and &javah; command lines
+                via the <option>-classpath</option> option.
+                The individual directory names will be
+                separated by the operating system's path separate character
+                (<filename>:</filename> on UNIX/Linux/POSIX,
+                <filename>;</filename>
+                on Windows).
+            </para>
 
-<cvar name="JAVACLASSSUFFIX">
-<summary>
-<para>
-The suffix for Java class files;
-<filename>.class</filename>
-by default.
-</para>
-</summary>
-</cvar>
+            <para>
+                Note that this currently just adds the specified
+                directory via the <option>-classpath</option> option.
+                &SCons; does not currently search the
+                &cv-JAVACLASSPATH; directories for dependency
+                <filename>.class</filename>
+                files.
+            </para>
+        </summary>
+    </cvar>
 
-<cvar name="JAVASOURCEPATH">
-<summary>
-<para>
-Specifies the list of directories that
-will be searched for input
-<filename>.java</filename> file.
-The directories in this list will be added to the
-&javac; command line
-via the <option>-sourcepath</option> option.
-The individual directory names will be
-separated by the operating system's path separate character
-(<filename>:</filename> on UNIX/Linux/POSIX,
-<filename>;</filename> on Windows).
-</para>
+    <cvar name="JAVACLASSSUFFIX">
+        <summary>
+            <para>
+                The suffix for Java class files;
+                <filename>.class</filename>
+                by default.
+            </para>
+        </summary>
+    </cvar>
 
-<para>
-Note that this currently just adds the specified
-directory via the <option>-sourcepath</option> option.
-&SCons; does not currently search the
-&cv-JAVASOURCEPATH; directories for dependency
-<filename>.java</filename> files.
-</para>
-</summary>
-</cvar>
+    <cvar name="JAVASOURCEPATH">
+        <summary>
+            <para>
+                Specifies the list of directories that
+                will be searched for input
+                <filename>.java</filename>
+                file.
+                The directories in this list will be added to the
+                &javac; command line
+                via the <option>-sourcepath</option> option.
+                The individual directory names will be
+                separated by the operating system's path separate character
+                (<filename>:</filename> on UNIX/Linux/POSIX,
+                <filename>;</filename>
+                on Windows).
+            </para>
 
-<cvar name="JAVASUFFIX">
-<summary>
-<para>
-The suffix for Java files;
-<filename>.java</filename>
-by default.
-</para>
-</summary>
-</cvar>
+            <para>
+                Note that this currently just adds the specified
+                directory via the <option>-sourcepath</option> option.
+                &SCons; does not currently search the
+                &cv-JAVASOURCEPATH; directories for dependency
+                <filename>.java</filename>
+                files.
+            </para>
+        </summary>
+    </cvar>
 
-<cvar name="JAVAVERSION">
-<summary>
-<para>
-Specifies the Java version being used by the &b-Java; builder.
-This is <emphasis>not</emphasis> currently used to select one
-version of the Java compiler vs. another.
-Instead, you should set this to specify the version of Java
-supported by your &javac; compiler.
-The default is <literal>1.4</literal>.
-</para>
+    <cvar name="JAVASUFFIX">
+        <summary>
+            <para>
+                The suffix for Java files;
+                <filename>.java</filename>
+                by default.
+            </para>
+        </summary>
+    </cvar>
 
-<para>
-This is sometimes necessary because
-Java 1.5 changed the file names that are created
-for nested anonymous inner classes,
-which can cause a mismatch with the files
-that &SCons; expects will be generated by the &javac; compiler.
-Setting &cv-JAVAVERSION; to <literal>1.5</literal>
-(or <literal>1.6</literal>, as appropriate)
-can make &SCons; realize that a Java 1.5 or 1.6
-build is actually up to date.
-</para>
-</summary>
-</cvar>
+    <cvar name="JAVAVERSION">
+        <summary>
+            <para>
+                Specifies the Java version being used by the &b-Java; builder.
+                This is <emphasis>not</emphasis> currently used to select one
+                version of the Java compiler vs. another.
+                Instead, you should set this to specify the version of Java
+                supported by your &javac; compiler.
+                The default is <literal>1.4</literal>.
+            </para>
+
+            <para>
+                This is sometimes necessary because
+                Java 1.5 changed the file names that are created
+                for nested anonymous inner classes,
+                which can cause a mismatch with the files
+                that &SCons; expects will be generated by the &javac; compiler.
+                Setting &cv-JAVAVERSION; to
+                <literal>1.5</literal>
+                (or <literal>1.6</literal>, as appropriate)
+                can make &SCons; realize that a Java 1.5 or 1.6
+                build is actually up to date.
+            </para>
+        </summary>
+    </cvar>
 
 </sconsdoc>
diff --git a/src/engine/SCons/Tool/javacTests.py b/src/engine/SCons/Tool/javacTests.py
index 0debbb6..067ff3e 100644
--- a/src/engine/SCons/Tool/javacTests.py
+++ b/src/engine/SCons/Tool/javacTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -24,8 +24,6 @@
 import os
 import unittest
 
-import TestUnit
-
 import SCons.Tool.javac
 
 class DummyNode(object):
@@ -40,14 +38,14 @@ class pathoptTestCase(unittest.TestCase):
         popt = SCons.Tool.javac.pathopt('-foopath', 'FOOPATH')
         env = {'FOOPATH': path}
         actual = popt(None, None, env, None)
-        self.assertEquals(expect, actual)
+        self.assertEqual(expect, actual)
 
     def assert_pathopt_default(self, expect, path, default):
         popt = SCons.Tool.javac.pathopt('-foopath', 'FOOPATH', default='DPATH')
         env = {'FOOPATH': path,
                'DPATH': default}
         actual = popt(None, None, env, None)
-        self.assertEquals(expect, actual)
+        self.assertEqual(expect, actual)
 
     def test_unset(self):
         self.assert_pathopt([], None)
@@ -101,5 +99,4 @@ class pathoptTestCase(unittest.TestCase):
             '')
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(pathoptTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
diff --git a/src/engine/SCons/Tool/javah.py b/src/engine/SCons/Tool/javah.py
index 0e1885c..84183cb 100644
--- a/src/engine/SCons/Tool/javah.py
+++ b/src/engine/SCons/Tool/javah.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/javah.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/javah.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
@@ -40,6 +40,8 @@ import SCons.Builder
 import SCons.Node.FS
 import SCons.Tool.javac
 import SCons.Util
+from SCons.Tool.JavaCommon import get_java_install_dirs
+
 
 def emit_java_headers(target, source, env):
     """Create and return lists of Java stub header files that will
@@ -120,6 +122,14 @@ def generate(env):
     java_javah = SCons.Tool.CreateJavaHBuilder(env)
     java_javah.emitter = emit_java_headers
 
+    if env['PLATFORM'] == 'win32':
+        # Ensure that we have a proper path for clang
+        javah = SCons.Tool.find_program_path(env, 'javah',
+                                             default_paths=get_java_install_dirs(env['PLATFORM']))
+        if javah:
+            javah_bin_dir = os.path.dirname(javah)
+            env.AppendENVPath('PATH', javah_bin_dir)
+
     env['_JAVAHOUTFLAG']    = JavaHOutFlagGenerator
     env['JAVAH']            = 'javah'
     env['JAVAHFLAGS']       = SCons.Util.CLVar('')
diff --git a/src/engine/SCons/Tool/javah.xml b/src/engine/SCons/Tool/javah.xml
index f362e3e..f72a6cd 100644
--- a/src/engine/SCons/Tool/javah.xml
+++ b/src/engine/SCons/Tool/javah.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/latex.py b/src/engine/SCons/Tool/latex.py
index aa7ea15..9626693 100644
--- a/src/engine/SCons/Tool/latex.py
+++ b/src/engine/SCons/Tool/latex.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/latex.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/latex.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Defaults
diff --git a/src/engine/SCons/Tool/latex.xml b/src/engine/SCons/Tool/latex.xml
index bb0816d..b4eb45a 100644
--- a/src/engine/SCons/Tool/latex.xml
+++ b/src/engine/SCons/Tool/latex.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/ldc.py b/src/engine/SCons/Tool/ldc.py
index 5bb04ff..fe3df1f 100644
--- a/src/engine/SCons/Tool/ldc.py
+++ b/src/engine/SCons/Tool/ldc.py
@@ -26,7 +26,7 @@ Lib tool variables:
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -48,7 +48,7 @@ Lib tool variables:
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ldc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/ldc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import subprocess
diff --git a/src/engine/SCons/Tool/ldc.xml b/src/engine/SCons/Tool/ldc.xml
index 1479867..691145a 100644
--- a/src/engine/SCons/Tool/ldc.xml
+++ b/src/engine/SCons/Tool/ldc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/lex.py b/src/engine/SCons/Tool/lex.py
index e185b93..affb52c 100644
--- a/src/engine/SCons/Tool/lex.py
+++ b/src/engine/SCons/Tool/lex.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,13 +31,17 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/lex.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/lex.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
+import sys
 
 import SCons.Action
 import SCons.Tool
 import SCons.Util
+from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
 
 LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
 
@@ -64,6 +68,29 @@ def lexEmitter(target, source, env):
                 target.append(fileName)
     return (target, source)
 
+def get_lex_path(env, append_paths=False):
+    """
+    Find the a path containing the lex or flex binaries. If a construction 
+    environment is passed in then append the path to the ENV PATH.
+    """
+    # save existing path to reset if we don't want to append any paths
+    envPath = env['ENV']['PATH']
+    bins = ['flex', 'lex', 'win_flex']
+
+    for prog in bins:
+        bin_path = SCons.Tool.find_program_path(
+            env, 
+            prog, 
+            default_paths=CHOCO_DEFAULT_PATH + MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+        if bin_path:
+            if not append_paths:
+                env['ENV']['PATH'] = envPath
+            else:
+                env.AppendENVPath('PATH', os.path.dirname(bin_path))
+            return bin_path
+    SCons.Warnings.Warning('lex tool requested, but lex or flex binary not found in ENV PATH')
+
+
 def generate(env):
     """Add Builders and construction variables for lex to an Environment."""
     c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
@@ -83,12 +110,23 @@ def generate(env):
     cxx_file.add_action(".ll", LexAction)
     cxx_file.add_emitter(".ll", lexEmitter)
 
-    env["LEX"]      = env.Detect("flex") or "lex"
     env["LEXFLAGS"] = SCons.Util.CLVar("")
-    env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
+
+    if sys.platform == 'win32':
+        get_lex_path(env, append_paths=True)
+        env["LEX"] = env.Detect(['flex', 'lex', 'win_flex'])
+        if not env.get("LEXUNISTD"):
+            env["LEXUNISTD"] = SCons.Util.CLVar("")
+        env["LEXCOM"] = "$LEX $LEXUNISTD $LEXFLAGS -t $SOURCES > $TARGET"
+    else:
+        env["LEX"] = env.Detect(["flex", "lex"])
+        env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
 
 def exists(env):
-    return env.Detect(["flex", "lex"])
+    if sys.platform == 'win32':
+        return get_lex_path(env)
+    else:
+        return env.Detect(["flex", "lex"])
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/lex.xml b/src/engine/SCons/Tool/lex.xml
index e178308..0d044b8 100644
--- a/src/engine/SCons/Tool/lex.xml
+++ b/src/engine/SCons/Tool/lex.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -33,6 +33,7 @@ Sets construction variables for the &lex; lexical analyser.
 <item>LEX</item>
 <item>LEXFLAGS</item>
 <item>LEXCOM</item>
+<item>LEXUNISTD</item>
 </sets>
 <uses>
 <item>LEXCOMSTR</item>
@@ -78,4 +79,12 @@ General options passed to the lexical analyzer generator.
 </summary>
 </cvar>
 
+<cvar name="LEXUNISTD">
+<summary>
+<para>
+Used only on windows environments to set a lex flag to prevent 'unistd.h' from being included. The default value is '--nounistd'.
+</para>
+</summary>
+</cvar>
+
 </sconsdoc>
diff --git a/src/engine/SCons/Tool/link.py b/src/engine/SCons/Tool/link.py
index e8c11ed..65fe013 100644
--- a/src/engine/SCons/Tool/link.py
+++ b/src/engine/SCons/Tool/link.py
@@ -1,4 +1,3 @@
-
 """SCons.Tool.link
 
 Tool-specific initialization for the generic Posix linker.
@@ -10,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +32,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/link.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/link.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import re
@@ -47,22 +46,21 @@ from SCons.Tool.FortranCommon import isfortran
 
 from SCons.Tool.DCommon import isD
 
-import SCons.Tool.cxx
-cplusplus = SCons.Tool.cxx
-# cplusplus = __import__(__package__+'.cxx', globals(), locals(), ['*'])
+from SCons.Tool.cxx import iscplusplus
 
 issued_mixed_link_warning = False
 
+
 def smart_link(source, target, env, for_signature):
-    has_cplusplus = cplusplus.iscplusplus(source)
+    has_cplusplus = iscplusplus(source)
     has_fortran = isfortran(env, source)
     has_d = isD(env, source)
     if has_cplusplus and has_fortran and not has_d:
         global issued_mixed_link_warning
         if not issued_mixed_link_warning:
             msg = "Using $CXX to link Fortran and C++ code together.\n\t" + \
-              "This may generate a buggy executable if the '%s'\n\t" + \
-              "compiler does not know how to deal with Fortran runtimes."
+                  "This may generate a buggy executable if the '%s'\n\t" + \
+                  "compiler does not know how to deal with Fortran runtimes."
             SCons.Warnings.warn(SCons.Warnings.FortranCxxMixWarning,
                                 msg % env.subst('$CXX'))
             issued_mixed_link_warning = True
@@ -77,11 +75,14 @@ def smart_link(source, target, env, for_signature):
         return '$CXX'
     return '$CC'
 
+
 def _lib_emitter(target, source, env, **kw):
     Verbose = False
     if Verbose:
-        print("_lib_emitter: target[0]={:r}".format(target[0].get_path()))
+        print("_lib_emitter: target[0]={!r}".format(target[0].get_path()))
     for tgt in target:
+        if SCons.Util.is_String(tgt):
+            tgt = env.File(tgt)
         tgt.attributes.shared = 1
 
     try:
@@ -90,21 +91,24 @@ def _lib_emitter(target, source, env, **kw):
         pass
     else:
         if Verbose:
-            print("_lib_emitter: symlink_generator={:r}".format(symlink_generator))
+            print("_lib_emitter: symlink_generator={!r}".format(symlink_generator))
         symlinks = symlink_generator(env, target[0])
         if Verbose:
-            print("_lib_emitter: symlinks={:r}".format(symlinks))
+            print("_lib_emitter: symlinks={!r}".format(symlinks))
 
         if symlinks:
             SCons.Tool.EmitLibSymlinks(env, symlinks, target[0])
             target[0].attributes.shliblinks = symlinks
     return (target, source)
 
+
 def shlib_emitter(target, source, env):
-    return _lib_emitter(target, source, env, symlink_generator = SCons.Tool.ShLibSymlinkGenerator)
+    return _lib_emitter(target, source, env, symlink_generator=SCons.Tool.ShLibSymlinkGenerator)
+
 
 def ldmod_emitter(target, source, env):
-    return _lib_emitter(target, source, env, symlink_generator = SCons.Tool.LdModSymlinkGenerator)
+    return _lib_emitter(target, source, env, symlink_generator=SCons.Tool.LdModSymlinkGenerator)
+
 
 # This is generic enough to be included here...
 def _versioned_lib_name(env, libnode, version, prefix, suffix, prefix_generator, suffix_generator, **kw):
@@ -112,98 +116,107 @@ def _versioned_lib_name(env, libnode, version, prefix, suffix, prefix_generator,
     Verbose = False
 
     if Verbose:
-        print("_versioned_lib_name: libnode={:r}".format(libnode.get_path()))
-        print("_versioned_lib_name: version={:r}".format(version))
-        print("_versioned_lib_name: prefix={:r}".format(prefix))
-        print("_versioned_lib_name: suffix={:r}".format(suffix))
-        print("_versioned_lib_name: suffix_generator={:r}".format(suffix_generator))
+        print("_versioned_lib_name: libnode={!r}".format(libnode.get_path()))
+        print("_versioned_lib_name: version={!r}".format(version))
+        print("_versioned_lib_name: prefix={!r}".format(prefix))
+        print("_versioned_lib_name: suffix={!r}".format(suffix))
+        print("_versioned_lib_name: suffix_generator={!r}".format(suffix_generator))
 
     versioned_name = os.path.basename(libnode.get_path())
     if Verbose:
-        print("_versioned_lib_name: versioned_name={:r}".format(versioned_name))
+        print("_versioned_lib_name: versioned_name={!r}".format(versioned_name))
 
     versioned_prefix = prefix_generator(env, **kw)
     versioned_suffix = suffix_generator(env, **kw)
     if Verbose:
-        print("_versioned_lib_name: versioned_prefix={:r}".format(versioned_prefix))
-        print("_versioned_lib_name: versioned_suffix={:r}".format(versioned_suffix))
+        print("_versioned_lib_name: versioned_prefix={!r}".format(versioned_prefix))
+        print("_versioned_lib_name: versioned_suffix={!r}".format(versioned_suffix))
 
     versioned_prefix_re = '^' + re.escape(versioned_prefix)
     versioned_suffix_re = re.escape(versioned_suffix) + '$'
     name = re.sub(versioned_prefix_re, prefix, versioned_name)
     name = re.sub(versioned_suffix_re, suffix, name)
     if Verbose:
-        print("_versioned_lib_name: name={:r}".format(name))
+        print("_versioned_lib_name: name={!r}".format(name))
     return name
 
+
 def _versioned_shlib_name(env, libnode, version, prefix, suffix, **kw):
-    pg = SCons.Tool.ShLibPrefixGenerator
-    sg = SCons.Tool.ShLibSuffixGenerator
-    return _versioned_lib_name(env, libnode, version, prefix, suffix, pg, sg, **kw)
+    prefix_generator = SCons.Tool.ShLibPrefixGenerator
+    suffix_generator = SCons.Tool.ShLibSuffixGenerator
+    return _versioned_lib_name(env, libnode, version, prefix, suffix, prefix_generator, suffix_generator, **kw)
+
 
 def _versioned_ldmod_name(env, libnode, version, prefix, suffix, **kw):
-    pg = SCons.Tool.LdModPrefixGenerator
-    sg = SCons.Tool.LdModSuffixGenerator
-    return _versioned_lib_name(env, libnode, version, prefix, suffix, pg, sg, **kw)
+    prefix_generator = SCons.Tool.LdModPrefixGenerator
+    suffix_generator = SCons.Tool.LdModSuffixGenerator
+    return _versioned_lib_name(env, libnode, version, prefix, suffix, prefix_generator, suffix_generator, **kw)
+
 
 def _versioned_lib_suffix(env, suffix, version):
     """For suffix='.so' and version='0.1.2' it returns '.so.0.1.2'"""
     Verbose = False
     if Verbose:
-        print("_versioned_lib_suffix: suffix={:r}".format(suffix))
-        print("_versioned_lib_suffix: version={:r}".format(version))
+        print("_versioned_lib_suffix: suffix={!r}".format(suffix))
+        print("_versioned_lib_suffix: version={!r}".format(version))
     if not suffix.endswith(version):
         suffix = suffix + '.' + version
     if Verbose:
-        print("_versioned_lib_suffix: return suffix={:r}".format(suffix))
+        print("_versioned_lib_suffix: return suffix={!r}".format(suffix))
     return suffix
 
+
 def _versioned_lib_soname(env, libnode, version, prefix, suffix, name_func):
     """For libnode='/optional/dir/libfoo.so.X.Y.Z' it returns 'libfoo.so.X'"""
     Verbose = False
     if Verbose:
-        print("_versioned_lib_soname: version={:r}".format(version))
+        print("_versioned_lib_soname: version={!r}".format(version))
     name = name_func(env, libnode, version, prefix, suffix)
     if Verbose:
-        print("_versioned_lib_soname: name={:r}".format(name))
+        print("_versioned_lib_soname: name={!r}".format(name))
     major = version.split('.')[0]
     soname = name + '.' + major
     if Verbose:
-        print("_versioned_lib_soname: soname={:r}".format(soname))
+        print("_versioned_lib_soname: soname={!r}".format(soname))
     return soname
 
+
 def _versioned_shlib_soname(env, libnode, version, prefix, suffix):
     return _versioned_lib_soname(env, libnode, version, prefix, suffix, _versioned_shlib_name)
 
+
 def _versioned_ldmod_soname(env, libnode, version, prefix, suffix):
     return _versioned_lib_soname(env, libnode, version, prefix, suffix, _versioned_ldmod_name)
 
+
 def _versioned_lib_symlinks(env, libnode, version, prefix, suffix, name_func, soname_func):
-    """Generate link names that should be created for a versioned shared lirbrary.
+    """Generate link names that should be created for a versioned shared library.
        Returns a dictionary in the form { linkname : linktarget }
     """
     Verbose = False
 
     if Verbose:
-        print("_versioned_lib_symlinks: libnode={:r}".format(libnode.get_path()))
-        print("_versioned_lib_symlinks: version={:r}".format(version))
+        print("_versioned_lib_symlinks: libnode={!r}".format(libnode.get_path()))
+        print("_versioned_lib_symlinks: version={!r}".format(version))
 
     if sys.platform.startswith('openbsd'):
         # OpenBSD uses x.y shared library versioning numbering convention
         # and doesn't use symlinks to backwards-compatible libraries
         if Verbose:
-            print("_versioned_lib_symlinks: return symlinks={:r}".format(None))
+            print("_versioned_lib_symlinks: return symlinks={!r}".format(None))
         return None
 
     linkdir = libnode.get_dir()
     if Verbose:
-        print("_versioned_lib_symlinks: linkdir={:r}".format(linkdir.get_path()))
+        print("_versioned_lib_symlinks: linkdir={!r}".format(linkdir.get_path()))
 
     name = name_func(env, libnode, version, prefix, suffix)
     if Verbose:
-        print("_versioned_lib_symlinks: name={:r}".format(name))
+        print("_versioned_lib_symlinks: name={!r}".format(name))
 
     soname = soname_func(env, libnode, version, prefix, suffix)
+    if Verbose:
+        print("_versioned_lib_symlinks: soname={!r}".format(soname))
 
     link0 = env.fs.File(soname, linkdir)
     link1 = env.fs.File(name, linkdir)
@@ -211,50 +224,63 @@ def _versioned_lib_symlinks(env, libnode, version, prefix, suffix, name_func, so
     # We create direct symlinks, not daisy-chained.
     if link0 == libnode:
         # This enables SHLIBVERSION without periods (e.g. SHLIBVERSION=1)
-        symlinks = [ (link1, libnode) ]
+        symlinks = [(link1, libnode)]
     else:
         # This handles usual SHLIBVERSION, i.e. '1.2', '1.2.3', etc.
-        symlinks = [ (link0, libnode), (link1, libnode) ]
+        symlinks = [(link0, libnode), (link1, libnode)]
 
     if Verbose:
-        print("_versioned_lib_symlinks: return symlinks={:r}".format(SCons.Tool.StringizeLibSymlinks(symlinks)))
+        print("_versioned_lib_symlinks: return symlinks={!r}".format(SCons.Tool.StringizeLibSymlinks(symlinks)))
 
     return symlinks
 
+
 def _versioned_shlib_symlinks(env, libnode, version, prefix, suffix):
-    nf = _versioned_shlib_name
-    sf = _versioned_shlib_soname
-    return _versioned_lib_symlinks(env, libnode, version, prefix, suffix, nf, sf)
+    name_func = env['LINKCALLBACKS']['VersionedShLibName']
+    soname_func = env['LINKCALLBACKS']['VersionedShLibSoname']
+
+    return _versioned_lib_symlinks(env, libnode, version, prefix, suffix, name_func, soname_func)
+
 
 def _versioned_ldmod_symlinks(env, libnode, version, prefix, suffix):
-    nf = _versioned_ldmod_name
-    sf = _versioned_ldmod_soname
-    return _versioned_lib_symlinks(env, libnode, version, prefix, suffix, nf, sf)
+    name_func = _versioned_ldmod_name
+    soname_func = _versioned_ldmod_soname
+
+    name_func = env['LINKCALLBACKS']['VersionedLdModName']
+    soname_func = env['LINKCALLBACKS']['VersionedLdModSoname']
+
+    return _versioned_lib_symlinks(env, libnode, version, prefix, suffix, name_func, soname_func)
+
 
 def _versioned_lib_callbacks():
     return {
-        'VersionedShLibSuffix'   : _versioned_lib_suffix,
-        'VersionedLdModSuffix'   : _versioned_lib_suffix,
-        'VersionedShLibSymlinks' : _versioned_shlib_symlinks,
-        'VersionedLdModSymlinks' : _versioned_ldmod_symlinks,
-        'VersionedShLibName'     : _versioned_shlib_name,
-        'VersionedLdModName'     : _versioned_ldmod_name,
-        'VersionedShLibSoname'   : _versioned_shlib_soname,
-        'VersionedLdModSoname'   : _versioned_ldmod_soname,
+        'VersionedShLibSuffix': _versioned_lib_suffix,
+        'VersionedLdModSuffix': _versioned_lib_suffix,
+        'VersionedShLibSymlinks': _versioned_shlib_symlinks,
+        'VersionedLdModSymlinks': _versioned_ldmod_symlinks,
+        'VersionedShLibName': _versioned_shlib_name,
+        'VersionedLdModName': _versioned_ldmod_name,
+        'VersionedShLibSoname': _versioned_shlib_soname,
+        'VersionedLdModSoname': _versioned_ldmod_soname,
     }.copy()
 
+
 def _setup_versioned_lib_variables(env, **kw):
     """
     Setup all variables required by the versioning machinery
     """
 
     tool = None
-    try: tool = kw['tool']
-    except KeyError: pass
+    try:
+        tool = kw['tool']
+    except KeyError:
+        pass
 
     use_soname = False
-    try: use_soname = kw['use_soname']
-    except KeyError: pass
+    try:
+        use_soname = kw['use_soname']
+    except KeyError:
+        pass
 
     # The $_SHLIBVERSIONFLAGS define extra commandline flags used when
     # building VERSIONED shared libraries. It's always set, but used only
@@ -284,22 +310,25 @@ def generate(env):
     SCons.Tool.createSharedLibBuilder(env)
     SCons.Tool.createProgBuilder(env)
 
-    env['SHLINK']      = '$LINK'
+    env['SHLINK'] = '$LINK'
     env['SHLINKFLAGS'] = SCons.Util.CLVar('$LINKFLAGS -shared')
-    env['SHLINKCOM']   = '$SHLINK -o $TARGET $SHLINKFLAGS $__SHLIBVERSIONFLAGS $__RPATH $SOURCES $_LIBDIRFLAGS $_LIBFLAGS'
-    # don't set up the emitter, cause AppendUnique will generate a list
+    env['SHLINKCOM'] = '$SHLINK -o $TARGET $SHLINKFLAGS $__SHLIBVERSIONFLAGS $__RPATH $SOURCES $_LIBDIRFLAGS $_LIBFLAGS'
+
+    # don't set up the emitter, because AppendUnique will generate a list
     # starting with None :-(
-    env.Append(SHLIBEMITTER = [shlib_emitter])
-    env['SMARTLINK']   = smart_link
-    env['LINK']        = "$SMARTLINK"
-    env['LINKFLAGS']   = SCons.Util.CLVar('')
+    env.Append(SHLIBEMITTER=[shlib_emitter])
+
+    env['SMARTLINK'] = smart_link
+    env['LINK'] = "$SMARTLINK"
+    env['LINKFLAGS'] = SCons.Util.CLVar('')
+
     # __RPATH is only set to something ($_RPATH typically) on platforms that support it.
-    env['LINKCOM']     = '$LINK -o $TARGET $LINKFLAGS $__RPATH $SOURCES $_LIBDIRFLAGS $_LIBFLAGS'
-    env['LIBDIRPREFIX']='-L'
-    env['LIBDIRSUFFIX']=''
-    env['_LIBFLAGS']='${_stripixes(LIBLINKPREFIX, LIBS, LIBLINKSUFFIX, LIBPREFIXES, LIBSUFFIXES, __env__)}'
-    env['LIBLINKPREFIX']='-l'
-    env['LIBLINKSUFFIX']=''
+    env['LINKCOM'] = '$LINK -o $TARGET $LINKFLAGS $__RPATH $SOURCES $_LIBDIRFLAGS $_LIBFLAGS'
+    env['LIBDIRPREFIX'] = '-L'
+    env['LIBDIRSUFFIX'] = ''
+    env['_LIBFLAGS'] = '${_stripixes(LIBLINKPREFIX, LIBS, LIBLINKSUFFIX, LIBPREFIXES, LIBSUFFIXES, __env__)}'
+    env['LIBLINKPREFIX'] = '-l'
+    env['LIBLINKSUFFIX'] = ''
 
     if env['PLATFORM'] == 'hpux':
         env['SHLIBSUFFIX'] = '.sl'
@@ -311,14 +340,16 @@ def generate(env):
     # setting them the same means that LoadableModule works everywhere.
     SCons.Tool.createLoadableModuleBuilder(env)
     env['LDMODULE'] = '$SHLINK'
-    env.Append(LDMODULEEMITTER = [ldmod_emitter])
+    env.Append(LDMODULEEMITTER=[ldmod_emitter])
     env['LDMODULEPREFIX'] = '$SHLIBPREFIX'
     env['LDMODULESUFFIX'] = '$SHLIBSUFFIX'
     env['LDMODULEFLAGS'] = '$SHLINKFLAGS'
-    env['LDMODULECOM'] = '$LDMODULE -o $TARGET $LDMODULEFLAGS $__LDMODULEVERSIONFLAGS $__RPATH $SOURCES $_LIBDIRFLAGS $_LIBFLAGS'
+    env[
+        'LDMODULECOM'] = '$LDMODULE -o $TARGET $LDMODULEFLAGS $__LDMODULEVERSIONFLAGS $__RPATH $SOURCES $_LIBDIRFLAGS $_LIBFLAGS'
     env['LDMODULEVERSION'] = '$SHLIBVERSION'
     env['LDMODULENOVERSIONSYMLINKS'] = '$SHLIBNOVERSIONSYMLINKS'
 
+
 def exists(env):
     # This module isn't really a Tool on its own, it's common logic for
     # other linkers.
diff --git a/src/engine/SCons/Tool/link.xml b/src/engine/SCons/Tool/link.xml
index 669a020..a8b6954 100644
--- a/src/engine/SCons/Tool/link.xml
+++ b/src/engine/SCons/Tool/link.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/linkloc.py b/src/engine/SCons/Tool/linkloc.py
index b79be06..cdcf25a 100644
--- a/src/engine/SCons/Tool/linkloc.py
+++ b/src/engine/SCons/Tool/linkloc.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/linkloc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/linkloc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import re
diff --git a/src/engine/SCons/Tool/linkloc.xml b/src/engine/SCons/Tool/linkloc.xml
index 09b43cb..567ed66 100644
--- a/src/engine/SCons/Tool/linkloc.xml
+++ b/src/engine/SCons/Tool/linkloc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/m4.py b/src/engine/SCons/Tool/m4.py
index 38b9976..30dc4c9 100644
--- a/src/engine/SCons/Tool/m4.py
+++ b/src/engine/SCons/Tool/m4.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/m4.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/m4.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Builder
diff --git a/src/engine/SCons/Tool/m4.xml b/src/engine/SCons/Tool/m4.xml
index f919af9..f7e81e5 100644
--- a/src/engine/SCons/Tool/m4.xml
+++ b/src/engine/SCons/Tool/m4.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/masm.py b/src/engine/SCons/Tool/masm.py
index 90162f4..77e32c2 100644
--- a/src/engine/SCons/Tool/masm.py
+++ b/src/engine/SCons/Tool/masm.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/masm.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/masm.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/masm.xml b/src/engine/SCons/Tool/masm.xml
index acc3aa3..1760252 100644
--- a/src/engine/SCons/Tool/masm.xml
+++ b/src/engine/SCons/Tool/masm.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/midl.py b/src/engine/SCons/Tool/midl.py
index 4088fc4..6879da1 100644
--- a/src/engine/SCons/Tool/midl.py
+++ b/src/engine/SCons/Tool/midl.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/midl.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/midl.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Builder
@@ -79,7 +79,7 @@ def generate(env):
     env['BUILDERS']['TypeLibrary'] = midl_builder
 
 def exists(env):
-    return msvc_exists()
+    return msvc_exists(env)
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/midl.xml b/src/engine/SCons/Tool/midl.xml
index cc1b880..717eb38 100644
--- a/src/engine/SCons/Tool/midl.xml
+++ b/src/engine/SCons/Tool/midl.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/mingw.py b/src/engine/SCons/Tool/mingw.py
index c2eaa96..ed3f1a3 100644
--- a/src/engine/SCons/Tool/mingw.py
+++ b/src/engine/SCons/Tool/mingw.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,10 +31,11 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mingw.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/mingw.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
+import glob
 
 import SCons.Action
 import SCons.Builder
@@ -42,29 +43,17 @@ import SCons.Defaults
 import SCons.Tool
 import SCons.Util
 
-# This is what we search for to find mingw:
-key_program = 'mingw32-gcc'
-
-def find(env):
-    # First search in the SCons path
-    path=env.WhereIs(key_program)
-    if (path):
-        return path
-    # then the OS path:
-    path=SCons.Util.WhereIs(key_program)
-    if (path):
-        return path
-
-    # If that doesn't work try default location for mingw
-    save_path=env['ENV']['PATH']
-    env.AppendENVPath('PATH',r'c:\MinGW\bin')
-    path =env.WhereIs(key_program)
-    if not path:
-        env['ENV']['PATH']=save_path
-    return path
+mingw_paths = [
+    r'c:\MinGW\bin',
+    r'C:\cygwin64\bin',
+    r'C:\msys64',
+    r'C:\cygwin\bin',
+    r'C:\msys',
+]
+
 
 def shlib_generator(target, source, env, for_signature):
-    cmd = SCons.Util.CLVar(['$SHLINK', '$SHLINKFLAGS']) 
+    cmd = SCons.Util.CLVar(['$SHLINK', '$SHLINKFLAGS'])
 
     dll = env.FindIxes(target, 'SHLIBPREFIX', 'SHLIBSUFFIX')
     if dll: cmd.extend(['-o', dll])
@@ -72,31 +61,32 @@ def shlib_generator(target, source, env, for_signature):
     cmd.extend(['$SOURCES', '$_LIBDIRFLAGS', '$_LIBFLAGS'])
 
     implib = env.FindIxes(target, 'LIBPREFIX', 'LIBSUFFIX')
-    if implib: cmd.append('-Wl,--out-implib,'+implib.get_string(for_signature))
+    if implib: cmd.append('-Wl,--out-implib,' + implib.get_string(for_signature))
 
     def_target = env.FindIxes(target, 'WINDOWSDEFPREFIX', 'WINDOWSDEFSUFFIX')
     insert_def = env.subst("$WINDOWS_INSERT_DEF")
     if not insert_def in ['', '0', 0] and def_target: \
-        cmd.append('-Wl,--output-def,'+def_target.get_string(for_signature))
+            cmd.append('-Wl,--output-def,' + def_target.get_string(for_signature))
 
     return [cmd]
 
+
 def shlib_emitter(target, source, env):
     dll = env.FindIxes(target, 'SHLIBPREFIX', 'SHLIBSUFFIX')
     no_import_lib = env.get('no_import_lib', 0)
 
     if not dll:
-        raise SCons.Errors.UserError("A shared library should have exactly one target with the suffix: %s Target(s) are:%s" %  \
+        raise SCons.Errors.UserError(
+            "A shared library should have exactly one target with the suffix: %s Target(s) are:%s" % \
             (env.subst("$SHLIBSUFFIX"), ",".join([str(t) for t in target])))
-    
-    if not no_import_lib and \
-       not env.FindIxes(target, 'LIBPREFIX', 'LIBSUFFIX'):
 
+    if not no_import_lib and \
+            not env.FindIxes(target, 'LIBPREFIX', 'LIBSUFFIX'):
         # Create list of target libraries as strings
-        targetStrings=env.ReplaceIxes(dll,  
-                                      'SHLIBPREFIX', 'SHLIBSUFFIX',
-                                      'LIBPREFIX', 'LIBSUFFIX')
-        
+        targetStrings = env.ReplaceIxes(dll,
+                                        'SHLIBPREFIX', 'SHLIBSUFFIX',
+                                        'LIBPREFIX', 'LIBSUFFIX')
+
         # Now add file nodes to target list
         target.append(env.fs.File(targetStrings))
 
@@ -108,17 +98,18 @@ def shlib_emitter(target, source, env):
     skip_def_insert = env.subst("$WINDOWS_INSERT_DEF") in ['', '0', 0]
     if not def_source and not def_target and not skip_def_insert:
         # Create list of target libraries and def files as strings
-        targetStrings=env.ReplaceIxes(dll,  
-                                      'SHLIBPREFIX', 'SHLIBSUFFIX',
-                                      'WINDOWSDEFPREFIX', 'WINDOWSDEFSUFFIX')
-        
+        targetStrings = env.ReplaceIxes(dll,
+                                        'SHLIBPREFIX', 'SHLIBSUFFIX',
+                                        'WINDOWSDEFPREFIX', 'WINDOWSDEFSUFFIX')
+
         # Now add file nodes to target list
         target.append(env.fs.File(targetStrings))
 
     return (target, source)
-                         
 
-shlib_action = SCons.Action.Action(shlib_generator, generator=1)
+
+shlib_action = SCons.Action.Action(shlib_generator, '$SHLINKCOMSTR', generator=1)
+ldmodule_action = SCons.Action.Action(shlib_generator, '$LDMODULECOMSTR', generator=1)
 
 res_action = SCons.Action.Action('$RCCOM', '$RCCOMSTR')
 
@@ -126,38 +117,63 @@ res_builder = SCons.Builder.Builder(action=res_action, suffix='.o',
                                     source_scanner=SCons.Tool.SourceFileScanner)
 SCons.Tool.SourceFileScanner.add_scanner('.rc', SCons.Defaults.CScan)
 
+# This is what we search for to find mingw:
+# key_program = 'mingw32-gcc'
+key_program = 'mingw32-make'
+
+
+def find_version_specific_mingw_paths():
+    """
+    One example of default mingw install paths is:
+    C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev2\mingw64\bin
+
+    Use glob'ing to find such and add to mingw_paths
+    """
+    new_paths = glob.glob(r"C:\mingw-w64\*\mingw64\bin")
+
+    return new_paths
+
+
 def generate(env):
-    mingw = find(env)
+    global mingw_paths
+    # Check for reasoanble mingw default paths
+    mingw_paths += find_version_specific_mingw_paths()
+
+    mingw = SCons.Tool.find_program_path(env, key_program, default_paths=mingw_paths)
     if mingw:
-        dir = os.path.dirname(mingw)
-        env.PrependENVPath('PATH', dir )
-        
+        mingw_bin_dir = os.path.dirname(mingw)
+        env.AppendENVPath('PATH', mingw_bin_dir)
 
     # Most of mingw is the same as gcc and friends...
     gnu_tools = ['gcc', 'g++', 'gnulink', 'ar', 'gas', 'gfortran', 'm4']
     for tool in gnu_tools:
         SCons.Tool.Tool(tool)(env)
 
-    #... but a few things differ:
+    # ... but a few things differ:
     env['CC'] = 'gcc'
+    # make sure the msvc tool doesnt break us, it added a /flag
+    if 'CCFLAGS' in env:
+        # make sure its a CLVar to handle list or str cases
+        if type(env['CCFLAGS']) is not SCons.Util.CLVar:
+            env['CCFLAGS'] = SCons.Util.CLVar(env['CCFLAGS'])
+        env['CCFLAGS'] = SCons.Util.CLVar(str(env['CCFLAGS']).replace('/nologo', ''))
     env['SHCCFLAGS'] = SCons.Util.CLVar('$CCFLAGS')
     env['CXX'] = 'g++'
     env['SHCXXFLAGS'] = SCons.Util.CLVar('$CXXFLAGS')
     env['SHLINKFLAGS'] = SCons.Util.CLVar('$LINKFLAGS -shared')
-    env['SHLINKCOM']   = shlib_action
-    env['LDMODULECOM'] = shlib_action
-    env.Append(SHLIBEMITTER = [shlib_emitter])
-    env.Append(LDMODULEEMITTER = [shlib_emitter])
+    env['SHLINKCOM'] = shlib_action
+    env['LDMODULECOM'] = ldmodule_action
+    env.Append(SHLIBEMITTER=[shlib_emitter])
+    env.Append(LDMODULEEMITTER=[shlib_emitter])
     env['AS'] = 'as'
 
-    env['WIN32DEFPREFIX']        = ''
-    env['WIN32DEFSUFFIX']        = '.def'
-    env['WINDOWSDEFPREFIX']      = '${WIN32DEFPREFIX}'
-    env['WINDOWSDEFSUFFIX']      = '${WIN32DEFSUFFIX}'
+    env['WIN32DEFPREFIX'] = ''
+    env['WIN32DEFSUFFIX'] = '.def'
+    env['WINDOWSDEFPREFIX'] = '${WIN32DEFPREFIX}'
+    env['WINDOWSDEFSUFFIX'] = '${WIN32DEFSUFFIX}'
 
     env['SHOBJSUFFIX'] = '.o'
     env['STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME'] = 1
-
     env['RC'] = 'windres'
     env['RCFLAGS'] = SCons.Util.CLVar('')
     env['RCINCFLAGS'] = '$( ${_concat(RCINCPREFIX, CPPPATH, RCINCSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)'
@@ -165,15 +181,21 @@ def generate(env):
     env['RCINCSUFFIX'] = ''
     env['RCCOM'] = '$RC $_CPPDEFFLAGS $RCINCFLAGS ${RCINCPREFIX} ${SOURCE.dir} $RCFLAGS -i $SOURCE -o $TARGET'
     env['BUILDERS']['RES'] = res_builder
-    
+
     # Some setting from the platform also have to be overridden:
     env['OBJSUFFIX'] = '.o'
     env['LIBPREFIX'] = 'lib'
     env['LIBSUFFIX'] = '.a'
     env['PROGSUFFIX'] = '.exe'
 
+
 def exists(env):
-    return find(env)
+    mingw = SCons.Tool.find_program_path(env, key_program, default_paths=mingw_paths)
+    if mingw:
+        mingw_bin_dir = os.path.dirname(mingw)
+        env.AppendENVPath('PATH', mingw_bin_dir)
+
+    return mingw
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/mingw.xml b/src/engine/SCons/Tool/mingw.xml
index 4848637..b1f028d 100644
--- a/src/engine/SCons/Tool/mingw.xml
+++ b/src/engine/SCons/Tool/mingw.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/msgfmt.py b/src/engine/SCons/Tool/msgfmt.py
index 7e3e2a4..87589ce 100644
--- a/src/engine/SCons/Tool/msgfmt.py
+++ b/src/engine/SCons/Tool/msgfmt.py
@@ -1,6 +1,6 @@
 """ msgfmt tool """
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/msgfmt.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/msgfmt.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Builder import BuilderBase
 #############################################################################
@@ -75,8 +75,22 @@ def _create_mo_file_builder(env, **kw):
 #############################################################################
 def generate(env,**kw):
   """ Generate `msgfmt` tool """
+  import sys
+  import os
   import SCons.Util
+  import SCons.Tool
   from SCons.Tool.GettextCommon import _detect_msgfmt
+  from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+  from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+
+  if sys.platform == 'win32':
+      msgfmt = SCons.Tool.find_program_path(env, 'msgfmt', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+      if msgfmt:
+          msgfmt_bin_dir = os.path.dirname(msgfmt)
+          env.AppendENVPath('PATH', msgfmt_bin_dir)
+      else:
+          SCons.Warnings.Warning('msgfmt tool requested, but binary not found in ENV PATH')
+
   try:
     env['MSGFMT'] = _detect_msgfmt(env)
   except:
diff --git a/src/engine/SCons/Tool/msgfmt.xml b/src/engine/SCons/Tool/msgfmt.xml
index e00f372..67a8e0d 100644
--- a/src/engine/SCons/Tool/msgfmt.xml
+++ b/src/engine/SCons/Tool/msgfmt.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/msginit.py b/src/engine/SCons/Tool/msginit.py
index 63daf7f..e52c1b5 100644
--- a/src/engine/SCons/Tool/msginit.py
+++ b/src/engine/SCons/Tool/msginit.py
@@ -3,7 +3,7 @@
 Tool specific initialization of msginit tool.
 """
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -24,7 +24,7 @@ Tool specific initialization of msginit tool.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/msginit.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/msginit.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Warnings
 import SCons.Builder
@@ -77,8 +77,22 @@ def _POInitBuilderWrapper(env, target=None, source=_null, **kw):
 #############################################################################
 def generate(env,**kw):
   """ Generate the `msginit` tool """
+  import sys
+  import os
   import SCons.Util
+  import SCons.Tool
   from SCons.Tool.GettextCommon import _detect_msginit
+  from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+  from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+
+  if sys.platform == 'win32':
+      msginit = SCons.Tool.find_program_path(env, 'msginit', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+      if msginit:
+          msginit_bin_dir = os.path.dirname(msginit)
+          env.AppendENVPath('PATH', msginit_bin_dir)
+      else:
+          SCons.Warnings.Warning('msginit tool requested, but binary not found in ENV PATH')
+
   try:
     env['MSGINIT'] = _detect_msginit(env)
   except:
diff --git a/src/engine/SCons/Tool/msginit.xml b/src/engine/SCons/Tool/msginit.xml
index 3a2a969..d09dde1 100644
--- a/src/engine/SCons/Tool/msginit.xml
+++ b/src/engine/SCons/Tool/msginit.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/msgmerge.py b/src/engine/SCons/Tool/msgmerge.py
index aef1f5f..849fe32 100644
--- a/src/engine/SCons/Tool/msgmerge.py
+++ b/src/engine/SCons/Tool/msgmerge.py
@@ -3,7 +3,7 @@
 Tool specific initialization for `msgmerge` tool.
 """
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -24,7 +24,7 @@ Tool specific initialization for `msgmerge` tool.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/msgmerge.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/msgmerge.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 #############################################################################
 def _update_or_init_po_files(target, source, env):
@@ -68,8 +68,21 @@ def _POUpdateBuilderWrapper(env, target=None, source=_null, **kw):
 
 #############################################################################
 def generate(env,**kw):
-  """ Generate the `xgettext` tool """
+  """ Generate the `msgmerge` tool """
+  import sys
+  import os
+  import SCons.Tool
   from SCons.Tool.GettextCommon import _detect_msgmerge
+  from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+  from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+
+  if sys.platform == 'win32':
+      msgmerge = SCons.Tool.find_program_path(env, 'msgmerge', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+      if msgmerge:
+          msgmerge_bin_dir = os.path.dirname(msgmerge)
+          env.AppendENVPath('PATH', msgmerge_bin_dir)
+      else:
+          SCons.Warnings.Warning('msgmerge tool requested, but binary not found in ENV PATH')
   try:
     env['MSGMERGE'] = _detect_msgmerge(env)
   except:
diff --git a/src/engine/SCons/Tool/msgmerge.xml b/src/engine/SCons/Tool/msgmerge.xml
index 65d19e1..2944679 100644
--- a/src/engine/SCons/Tool/msgmerge.xml
+++ b/src/engine/SCons/Tool/msgmerge.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/mslib.py b/src/engine/SCons/Tool/mslib.py
index 3d79649..00a17d7 100644
--- a/src/engine/SCons/Tool/mslib.py
+++ b/src/engine/SCons/Tool/mslib.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mslib.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/mslib.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
@@ -55,7 +55,7 @@ def generate(env):
     env['LIBSUFFIX']   = '.lib'
 
 def exists(env):
-    return msvc_exists()
+    return msvc_exists(env)
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/mslib.xml b/src/engine/SCons/Tool/mslib.xml
index 6ee2f22..a9b7cef 100644
--- a/src/engine/SCons/Tool/mslib.xml
+++ b/src/engine/SCons/Tool/mslib.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/mslink.py b/src/engine/SCons/Tool/mslink.py
index 1b16b63..9df531b 100644
--- a/src/engine/SCons/Tool/mslink.py
+++ b/src/engine/SCons/Tool/mslink.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/mslink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/mslink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
@@ -328,7 +328,7 @@ def generate(env):
     env['LDMODULECOM'] = compositeLdmodAction
 
 def exists(env):
-    return msvc_exists()
+    return msvc_exists(env)
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/mslink.xml b/src/engine/SCons/Tool/mslink.xml
index 24b79c7..692c1da 100644
--- a/src/engine/SCons/Tool/mslink.xml
+++ b/src/engine/SCons/Tool/mslink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/mssdk.py b/src/engine/SCons/Tool/mssdk.py
index dd9de93..d66c7fc 100644
--- a/src/engine/SCons/Tool/mssdk.py
+++ b/src/engine/SCons/Tool/mssdk.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mssdk.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/mssdk.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 """engine.SCons.Tool.mssdk
 
diff --git a/src/engine/SCons/Tool/mssdk.xml b/src/engine/SCons/Tool/mssdk.xml
index 0ae3553..b84597e 100644
--- a/src/engine/SCons/Tool/mssdk.xml
+++ b/src/engine/SCons/Tool/mssdk.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/msvc.py b/src/engine/SCons/Tool/msvc.py
index 2fe16c3..a611f8e 100644
--- a/src/engine/SCons/Tool/msvc.py
+++ b/src/engine/SCons/Tool/msvc.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/msvc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/msvc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import re
@@ -112,7 +112,7 @@ def object_emitter(target, source, env, parent_emitter):
     #
     # See issue #2505 for a discussion of what to do if it turns
     # out this assumption causes trouble in the wild:
-    # http://scons.tigris.org/issues/show_bug.cgi?id=2505
+    # https://github.com/SCons/scons/issues/2505
     if 'PCH' in env:
         pch = env['PCH']
         if str(target[0]) != SCons.Util.splitext(str(pch))[0] + '.obj':
@@ -195,7 +195,10 @@ def msvc_output_flag(target, source, env, for_signature):
         # that the test(s) for this can be run on non-Windows systems
         # without having a hard-coded backslash mess up command-line
         # argument parsing.
-        return '/Fo${TARGET.dir}' + os.sep
+        # Adding double os.sep's as if the TARGET.dir has a space or otherwise
+        # needs to be quoted they are needed per MSVC's odd behavior
+        # See: https://github.com/SCons/scons/issues/3106
+        return '/Fo${TARGET.dir}' + os.sep*2
 
 CAction = SCons.Action.Action("$CCCOM", "$CCCOMSTR",
                               batch_key=msvc_batch_key,
@@ -259,7 +262,7 @@ def generate(env):
     env['STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME'] = 1
 
     env['RC'] = 'rc'
-    env['RCFLAGS'] = SCons.Util.CLVar('')
+    env['RCFLAGS'] = SCons.Util.CLVar('/nologo')
     env['RCSUFFIXES']=['.rc','.rc2']
     env['RCCOM'] = '$RC $_CPPDEFFLAGS $_CPPINCFLAGS $RCFLAGS /fo$TARGET $SOURCES'
     env['BUILDERS']['RES'] = res_builder
@@ -268,6 +271,10 @@ def generate(env):
     env['SHOBJPREFIX']    = '$OBJPREFIX'
     env['SHOBJSUFFIX']    = '$OBJSUFFIX'
 
+    # MSVC probably wont support unistd.h so default
+    # without it for lex generation
+    env["LEXUNISTD"] = SCons.Util.CLVar("--nounistd")
+
     # Set-up ms tools paths
     msvc_setup_env_once(env)
 
@@ -286,7 +293,7 @@ def generate(env):
         env['ENV']['SystemRoot'] = SCons.Platform.win32.get_system_root()
 
 def exists(env):
-    return msvc_exists()
+    return msvc_exists(env)
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/msvc.xml b/src/engine/SCons/Tool/msvc.xml
index edc6936..03d8ce3 100644
--- a/src/engine/SCons/Tool/msvc.xml
+++ b/src/engine/SCons/Tool/msvc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -305,7 +305,8 @@ containing the command-line options
 for specifying directories to be searched
 by the resource compiler.
 The value of &cv-RCINCFLAGS; is created
-by appending &cv-RCINCPREFIX; and &cv-RCINCSUFFIX;
+by respectively prepending and appending
+&cv-RCINCPREFIX; and &cv-RCINCSUFFIX;
 to the beginning and end
 of each directory in &cv-CPPPATH;.
 </para>
@@ -317,7 +318,7 @@ of each directory in &cv-CPPPATH;.
 <para>
 The prefix (flag) used to specify an include directory
 on the resource compiler command line.
-This will be appended to the beginning of each directory
+This will be prepended to the beginning of each directory
 in the &cv-CPPPATH; construction variable
 when the &cv-RCINCFLAGS; variable is expanded.
 </para>
@@ -352,6 +353,7 @@ constructor; setting it later has no effect.
 
 <para>
 Valid values for Windows are
+<literal>14.1</literal>,
 <literal>14.0</literal>,
 <literal>14.0Exp</literal>,
 <literal>12.0</literal>,
@@ -424,18 +426,24 @@ This variable must be passed as an argument to the Environment()
 constructor; setting it later has no effect.  
 This is currently only used on Windows, but in the future it will be
 used on other OSes as well.
+If this is set and MSVC_VERSION is not set, this will search for 
+all installed MSVC's that support the TARGET_ARCH, selecting the 
+latest version for use.
 </para>
 
 <para>
 Valid values for Windows are
 <literal>x86</literal>,
+<literal>arm</literal>,
 <literal>i386</literal>
 (for 32 bits); 
 <literal>amd64</literal>,
+<literal>arm64</literal>,
 <literal>emt64</literal>,
 <literal>x86_64</literal>
 (for 64 bits);
 and <literal>ia64</literal> (Itanium).
+
 For example, if you want to compile 64-bit binaries, you would set
 <literal>TARGET_ARCH='x86_64'</literal> in your SCons environment.
 </para>
diff --git a/src/engine/SCons/Tool/msvs.py b/src/engine/SCons/Tool/msvs.py
index 05531c6..ddf8608 100644
--- a/src/engine/SCons/Tool/msvs.py
+++ b/src/engine/SCons/Tool/msvs.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/msvs.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/msvs.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -149,9 +149,9 @@ def splitFully(path):
     return [base]
 
 def makeHierarchy(sources):
-    '''Break a list of files into a hierarchy; for each value, if it is a string,
+    """Break a list of files into a hierarchy; for each value, if it is a string,
        then it is a file.  If it is a dictionary, it is a folder.  The string is
-       the original path of the file.'''
+       the original path of the file."""
 
     hierarchy = {}
     for file in sources:
@@ -189,7 +189,7 @@ class _UserGenerator(object):
         elif SCons.Util.is_List(env['variant']):
             variants = env['variant']
 
-        if 'DebugSettings' not in env or env['DebugSettings'] == None:
+        if 'DebugSettings' not in env or env['DebugSettings'] is None:
             dbg_settings = []
         elif SCons.Util.is_Dict(env['DebugSettings']):
             dbg_settings = [env['DebugSettings']]
@@ -520,7 +520,7 @@ class _DSPGenerator(object):
             config.cmdargs = cmdargs
             config.runfile = runfile
 
-            match = re.match('(.*)\|(.*)', variant)
+            match = re.match(r'(.*)\|(.*)', variant)
             if match:
                 config.variant = match.group(1)
                 config.platform = match.group(2)
@@ -1096,12 +1096,17 @@ V10DSPCommandLine = """\
 \t\t<NMakeForcedUsingAssemblies Condition="'$(Configuration)|$(Platform)'=='%(variant)s|%(platform)s'">$(NMakeForcedUsingAssemblies)</NMakeForcedUsingAssemblies>
 """
 
+V15DSPHeader = """\
+<?xml version="1.0" encoding="%(encoding)s"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+"""
+
 class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
     """Generates a Project file for MSVS 2010"""
 
-    def __init__(self, dspfile, source, env):
+    def __init__(self, dspfile, header, source, env):
         _DSPGenerator.__init__(self, dspfile, source, env)
-        self.dspheader = V10DSPHeader
+        self.dspheader = header
         self.dspconfiguration = V10DSPProjectConfiguration
         self.dspglobals = V10DSPGlobals
 
@@ -1287,7 +1292,7 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
                       'Other Files': ''}
 
         cats = sorted([k for k in list(categories.keys()) if self.sources[k]],
-		              key = lambda a: a.lower())
+                      key = lambda a: a.lower())
 
         # print vcxproj.filters file first
         self.filters_file.write('\t<ItemGroup>\n')
@@ -1423,7 +1428,7 @@ class _GenerateV7DSW(_DSWGenerator):
         def AddConfig(self, variant, dswfile=dswfile):
             config = Config()
 
-            match = re.match('(.*)\|(.*)', variant)
+            match = re.match(r'(.*)\|(.*)', variant)
             if match:
                 config.variant = match.group(1)
                 config.platform = match.group(2)
@@ -1501,7 +1506,9 @@ class _GenerateV7DSW(_DSWGenerator):
     def PrintSolution(self):
         """Writes a solution file"""
         self.file.write('Microsoft Visual Studio Solution File, Format Version %s\n' % self.versionstr)
-        if self.version_num >= 12.0:
+        if self.version_num > 14.0:
+            self.file.write('# Visual Studio 15\n')
+        elif self.version_num >= 12.0:
             self.file.write('# Visual Studio 14\n')
         elif self.version_num >= 11.0:
             self.file.write('# Visual Studio 11\n')
@@ -1519,7 +1526,7 @@ class _GenerateV7DSW(_DSWGenerator):
                 name = base
             self.file.write('Project("%s") = "%s", "%s", "%s"\n'
                             % (external_makefile_guid, name, dspinfo['SLN_RELATIVE_FILE_PATH'], dspinfo['GUID']))
-            if self.version_num >= 7.1 and self.version_num < 8.0:
+            if 7.1 <= self.version_num < 8.0:
                 self.file.write('\tProjectSection(ProjectDependencies) = postProject\n'
                                 '\tEndProjectSection\n')
             self.file.write('EndProject\n')
@@ -1679,8 +1686,11 @@ def GenerateDSP(dspfile, source, env):
     version_num = 6.0
     if 'MSVS_VERSION' in env:
         version_num, suite = msvs_parse_version(env['MSVS_VERSION'])
-    if version_num >= 10.0:
-        g = _GenerateV10DSP(dspfile, source, env)
+    if version_num > 14.0:
+        g = _GenerateV10DSP(dspfile, V15DSPHeader, source, env)
+        g.Build()
+    elif version_num >= 10.0:
+        g = _GenerateV10DSP(dspfile, V10DSPHeader, source, env)
         g.Build()
     elif version_num >= 7.0:
         g = _GenerateV7DSP(dspfile, source, env)
@@ -1990,7 +2000,7 @@ def generate(env):
     env['SCONS_HOME'] = os.environ.get('SCONS_HOME')
 
 def exists(env):
-    return msvc_exists()
+    return msvc_exists(env)
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/msvs.xml b/src/engine/SCons/Tool/msvs.xml
index 0408509..7943f22 100644
--- a/src/engine/SCons/Tool/msvs.xml
+++ b/src/engine/SCons/Tool/msvs.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -17,160 +17,212 @@ See its __doc__ string for a discussion of the format.
 <!ENTITY % variables-mod SYSTEM "../../../../doc/generated/variables.mod">
 %variables-mod;
 ]>
-<sconsdoc
-xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd"
-xmlns="http://www.scons.org/dbxsd/v1.0"
-xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-xmlns:xs="http://www.w3.org/2001/XMLSchema"
-xmlns:ns="http://www.scons.org/dbxsd/v1.0"><tool name="msvs"> <summary> <para>
-Sets construction variables for Microsoft Visual Studio. </para> </summary>
-<sets> <item>MSVSPROJECTCOM</item> <item>MSVSSOLUTIONCOM</item>
-<item>MSVSSCONSCRIPT</item> <item>MSVSSCONS</item> <item>MSVSSCONSFLAGS</item>
-<item>MSVSSCONSCOM</item> <item>MSVSBUILDCOM</item>
-<item>MSVSREBUILDCOM</item> <item>MSVSCLEANCOM</item>
-<item>MSVSENCODING</item> </sets> <uses> </uses> </tool> <builder
-name="MSVSProject"> <summary> <para> Builds a Microsoft Visual Studio project
-file, and by default builds a solution file as well. </para> <para> This
-builds a Visual Studio project file, based on the version of Visual Studio
-that is configured (either the latest installed version, or the version
-specified by &cv-link-MSVS_VERSION; in the Environment constructor). For
-Visual Studio 6, it will generate a <filename>.dsp</filename> file. For Visual
-Studio 7 (.NET) and later versions, it will generate a
-<filename>.vcproj</filename> file. </para> <para> By default, this also
-generates a solution file for the specified project, a
-<filename>.dsw</filename> file for Visual Studio 6 or a
-<filename>.sln</filename> file for Visual Studio 7 (.NET). This behavior may
-be disabled by specifying <literal>auto_build_solution=0</literal> when you
-call &b-MSVSProject;, in which case you presumably want to build the solution
-file(s) by calling the &b-MSVSSolution; Builder (see below). </para> <para>
-The &b-MSVSProject; builder takes several lists of filenames to be placed into
-the project file. These are currently limited to <literal>srcs</literal>,
-<literal>incs</literal>, <literal>localincs</literal>,
-<literal>resources</literal>, and <literal>misc</literal>. These are pretty
-self-explanatory, but it should be noted that these lists are added to the
-&cv-link-SOURCES; construction variable as strings, NOT as SCons File Nodes.
-This is because they represent file names to be added to the project file, not
-the source files used to build the project file. </para> <para> The above
-filename lists are all optional, although at least one must be specified for
-the resulting project file to be non-empty. </para> <para> In addition to the
-above lists of values, the following values may be specified:
-</para><variablelist>
-    <varlistentry>
-      <term>target</term>
-
-      <listitem>
-        <para>The name of the target <filename>.dsp</filename> or
-        <filename>.vcproj</filename> file. The correct suffix for the version
-        of Visual Studio must be used, but the &cv-link-MSVSPROJECTSUFFIX;
-        construction variable will be defined to the correct value (see
-        example below).</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>variant</term>
-
-      <listitem>
-        <para>The name of this particular variant. For Visual Studio 7
-        projects, this can also be a list of variant names. These are
-        typically things like "Debug" or "Release", but really can be anything
-        you want. For Visual Studio 7 projects, they may also specify a target
-        platform separated from the variant name by a <literal>|</literal>
-        (vertical pipe) character: <literal>Debug|Xbox</literal>. The default
-        target platform is Win32. Multiple calls to &b-MSVSProject; with
-        different variants are allowed; all variants will be added to the
-        project file with their appropriate build targets and
-        sources.</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>cmdargs</term>
-
-      <listitem>
-        <para>Additional command line arguments for the different
-        variants. The number of <literal>cmdargs</literal> entries must match
-        the number of <literal>variant</literal> entries, or be empty (not
-        specified). If you give only one, it will automatically be propagated
-        to all variants.</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>buildtarget</term>
-
-      <listitem>
-        <para>An optional string, node, or list of strings or nodes (one
-        per build variant), to tell the Visual Studio debugger what output
-        target to use in what build variant. The number of
-        <literal>buildtarget</literal> entries must match the number of
-        <literal>variant</literal> entries.</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>runfile</term>
-
-      <listitem>
-        <para>The name of the file that Visual Studio 7 and later will
-        run and debug. This appears as the value of the
-        <literal>Output</literal> field in the resulting Visual Studio project
-        file. If this is not specified, the default is the same as the
-        specified <literal>buildtarget</literal> value.</para>
-      </listitem>
-    </varlistentry>
-  </variablelist><para> Note that because &SCons; always executes its build
-commands from the directory in which the &SConstruct; file is located, if you
-generate a project file in a different directory than the &SConstruct;
-directory, users will not be able to double-click on the file name in
-compilation error messages displayed in the Visual Studio console output
-window. This can be remedied by adding the Visual C/C++ <literal>/FC</literal>
-compiler option to the &cv-link-CCFLAGS; variable so that the compiler will
-print the full path name of any files that cause compilation errors. </para>
-<para> Example usage: </para>
-    <example_commands>
+<sconsdoc xmlns="http://www.scons.org/dbxsd/v1.0" xmlns:ns="http://www.scons.org/dbxsd/v1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
+  <tool name="msvs">
+    <summary>
+      <para>Sets construction variables for Microsoft Visual Studio.</para>
+    </summary>
+    <sets>
+      <item>MSVSPROJECTCOM</item>
+      <item>MSVSSOLUTIONCOM</item>
+      <item>MSVSSCONSCRIPT</item>
+      <item>MSVSSCONS</item>
+      <item>MSVSSCONSFLAGS</item>
+      <item>MSVSSCONSCOM</item>
+      <item>MSVSBUILDCOM</item>
+      <item>MSVSREBUILDCOM</item>
+      <item>MSVSCLEANCOM</item>
+      <item>MSVSENCODING</item>
+    </sets>
+    <uses />
+  </tool>
+  <builder name="MSVSProject">
+    <summary>
+      <para>
+        Builds a Microsoft Visual Studio project file, and by default
+        builds a solution file as well.
+      </para>
+      <para>
+        This builds a Visual Studio project file, based on the
+        version of Visual Studio that is configured (either the
+        latest installed version, or the version specified by
+        &cv-link-MSVS_VERSION; in the Environment constructor). For
+        Visual Studio 6, it will generate a <filename>.dsp</filename>
+        file. For Visual Studio 7 (.NET) and later versions, it will
+        generate a <filename>.vcproj</filename> file.
+      </para>
+      <para>
+        By default, this also generates a solution file for the
+        specified project, a <filename>.dsw</filename> file for
+        Visual Studio 6 or a <filename>.sln</filename> file for
+        Visual Studio 7 (.NET). This behavior may be disabled by
+        specifying <literal>auto_build_solution=0</literal> when you
+        call &b-MSVSProject;, in which case you presumably want to
+        build the solution file(s) by calling the &b-MSVSSolution;
+        Builder (see below).
+      </para>
+      <para>
+        The &b-MSVSProject; builder takes several lists of filenames
+        to be placed into the project file. These are currently
+        limited to <literal>srcs</literal>, <literal>incs</literal>,
+        <literal>localincs</literal>, <literal>resources</literal>, and
+        <literal>misc</literal>. These are pretty self-explanatory,
+        but it should be noted that these lists are added to the
+        &cv-link-SOURCES; construction variable as strings, NOT as
+        SCons File Nodes.  This is because they represent file names
+        to be added to the project file, not the source files used
+        to build the project file.
+      </para>
+      <para>
+        The above filename lists are all optional, although at least
+        one must be specified for the resulting project file to
+        be non-empty.
+      </para>
+      <para>
+        In addition to the above lists of values, the following values
+        may be specified:
+      </para>
+      <variablelist>
+        <varlistentry>
+          <term>target</term>
+          <listitem>
+            <para>
+              The name of the target <filename>.dsp</filename>
+              or <filename>.vcproj</filename> file.
+              The correct suffix for the version of Visual Studio
+              must be used, but the &cv-link-MSVSPROJECTSUFFIX;
+              construction variable will be defined to the correct
+              value (see example below).
+            </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>variant</term>
+          <listitem>
+            <para>
+              The name of this particular variant. For Visual Studio 7
+              projects, this can also be a list of variant names. These
+              are typically things like "Debug" or "Release", but
+              really can be anything you want. For Visual Studio
+              7 projects, they may also specify a target platform
+              separated from the variant name by a <literal>|</literal>
+              (vertical pipe) character: <literal>Debug|Xbox</literal>.
+              The default target platform is Win32. Multiple calls
+              to &b-MSVSProject; with different variants are allowed;
+              all variants will be added to the project file with
+              their appropriate build targets and sources.
+            </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>cmdargs</term>
+          <listitem>
+            <para>
+              Additional command line arguments
+              for the different variants. The number of
+              <literal>cmdargs</literal> entries must match the number
+              of <literal>variant</literal> entries, or be empty (not
+              specified). If you give only one, it will automatically
+              be propagated to all variants.
+            </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>buildtarget</term>
+          <listitem>
+            <para>
+              An optional string, node, or list of strings
+              or nodes (one per build variant), to tell
+              the Visual Studio debugger what output target
+              to use in what build variant. The number of
+              <literal>buildtarget</literal> entries must match the
+              number of <literal>variant</literal> entries.
+            </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>runfile</term>
+          <listitem>
+            <para>
+              The name of the file that Visual Studio 7 and
+              later will run and debug. This appears as the
+              value of the <literal>Output</literal> field in the
+              resulting Visual Studio project file. If this is not
+              specified, the default is the same as the specified
+              <literal>buildtarget</literal> value.
+            </para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+      <para>
+        Note that because &SCons; always executes its build commands
+        from the directory in which the &SConstruct; file is located,
+        if you generate a project file in a different directory
+        than the &SConstruct; directory, users will not be able to
+        double-click on the file name in compilation error messages
+        displayed in the Visual Studio console output window. This can
+        be remedied by adding the Visual C/C++ <literal>/FC</literal>
+        compiler option to the &cv-link-CCFLAGS; variable so that
+        the compiler will print the full path name of any files that
+        cause compilation errors.
+      </para>
+      <para>Example usage:</para>
+      <example_commands>
 barsrcs = ['bar.cpp']
 barincs = ['bar.h']
 barlocalincs = ['StdAfx.h']
 barresources = ['bar.rc','resource.h']
 barmisc = ['bar_readme.txt']
 
-dll = env.SharedLibrary(target = 'bar.dll',
-                        source = barsrcs)
+dll = env.SharedLibrary(target='bar.dll',
+                        source=barsrcs)
 buildtarget = [s for s in dll if str(s).endswith('dll')]
-env.MSVSProject(target = 'Bar' + env['MSVSPROJECTSUFFIX'],
-                srcs = barsrcs,
-                incs = barincs,
-                localincs = barlocalincs,
-                resources = barresources,
-                misc = barmisc,
-                buildtarget = buildtarget,
-                variant = 'Release')
-</example_commands>
-<para>Starting with version 2.4 of
-SCons it's also possible to specify the optional argument
-<parameter>DebugSettings</parameter>, which creates files for debugging under
-Visual Studio:</para><variablelist>
-    <varlistentry>
-      <term>DebugSettings</term>
-
-      <listitem>
-        <para>A dictionary of debug settings that get written to the
-        <filename>.vcproj.user</filename> or the
-        <filename>.vcxproj.user</filename> file, depending on the version
-        installed. As it is done for cmdargs (see above), you can specify a
-        <parameter>DebugSettings</parameter> dictionary per variant. If you
-        give only one, it will be propagated to all variants.</para>
-      </listitem>
-    </varlistentry>
-  </variablelist><para>Currently, only Visual Studio v9.0 and Visual Studio
-version v11 are implemented, for other versions no file is generated. To
-generate the user file, you just need to add a
-<parameter>DebugSettings</parameter> dictionary to the environment with the
-right parameters for your MSVS version. If the dictionary is empty, or does
-not contain any good value, no file will be generated.</para><para>Following
-is a more contrived example, involving the setup of a project for variants and
-DebugSettings:</para><example_commands># Assuming you store your defaults in a file
+env.MSVSProject(target='Bar' + env['MSVSPROJECTSUFFIX'],
+                srcs=barsrcs,
+                incs=barincs,
+                localincs=barlocalincs,
+                resources=barresources,
+                misc=barmisc,
+                buildtarget=buildtarget,
+                variant='Release')
+      </example_commands>
+      <para>
+        Starting with version 2.4 of SCons it is
+        also possible to specify the optional argument
+        <parameter>DebugSettings</parameter>, which creates files
+        for debugging under Visual Studio:
+      </para>
+      <variablelist>
+        <varlistentry>
+          <term>DebugSettings</term>
+          <listitem>
+            <para>
+              A dictionary of debug settings that get written
+              to the <filename>.vcproj.user</filename> or the
+              <filename>.vcxproj.user</filename> file, depending on the
+              version installed. As it is done for cmdargs (see above),
+              you can specify a <parameter>DebugSettings</parameter>
+              dictionary per variant. If you give only one, it will
+              be propagated to all variants.
+            </para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+      <para>
+        Currently, only Visual Studio v9.0 and Visual Studio
+        version v11 are implemented, for other versions no file
+        is generated. To generate the user file, you just need to
+        add a <parameter>DebugSettings</parameter> dictionary to the
+        environment with the right parameters for your MSVS version. If
+        the dictionary is empty, or does not contain any good value,
+        no file will be generated.
+      </para>
+      <para>
+        Following is a more contrived example, involving the setup
+        of a project for variants and DebugSettings:
+      </para>
+      <example_commands>
+# Assuming you store your defaults in a file
 vars = Variables('variables.py')
 msvcver = vars.args.get('vc', '9')
 
@@ -179,7 +231,7 @@ if msvcver == '9' or msvcver == '11':
   env = Environment(MSVC_VERSION=msvcver+'.0', MSVC_BATCH=False)
 else:
   env = Environment()
-    
+
 AddOption('--userfile', action='store_true', dest='userfile', default=False,
           help="Create Visual Studio Project user file")
 
@@ -214,10 +266,10 @@ V9DebugSettings = {
 }
 
 #
-# 2. Because there are a lot of different options depending on the Microsoft 
-# Visual Studio version, if you use more than one version you have to 
-# define a dictionary per version, for instance if you want to create a user 
-# file to launch a specific application for testing your dll with Microsoft 
+# 2. Because there are a lot of different options depending on the Microsoft
+# Visual Studio version, if you use more than one version you have to
+# define a dictionary per version, for instance if you want to create a user
+# file to launch a specific application for testing your dll with Microsoft
 # Visual Studio 2012 (v11):
 #
 V10DebugSettings = {
@@ -249,7 +301,7 @@ V10DebugSettings = {
 }
 
 #
-# 3. Select the dictionary you want depending on the version of visual Studio 
+# 3. Select the dictionary you want depending on the version of visual Studio
 # Files you want to generate.
 #
 if not env.GetOption('userfile'):
@@ -258,7 +310,7 @@ elif env.get('MSVC_VERSION', None) == '9.0':
     dbgSettings = V9DebugSettings
 elif env.get('MSVC_VERSION', None) == '11.0':
     dbgSettings = V10DebugSettings
-else:    
+else:
     dbgSettings = None
 
 #
@@ -270,251 +322,365 @@ barlocalincs = ['StdAfx.h']
 barresources = ['bar.rc','resource.h']
 barmisc = ['ReadMe.txt']
 
-dll = env.SharedLibrary(target = 'bar.dll',
-                        source = barsrcs)
-
-env.MSVSProject(target = 'Bar' + env['MSVSPROJECTSUFFIX'],
-                srcs = barsrcs,
-                incs = barincs,
-                localincs = barlocalincs,
-                resources = barresources,
-                misc = barmisc,
-                buildtarget = [dll[0]] * 2,
-                variant = ('Debug|Win32', 'Release|Win32'),
-                cmdargs = 'vc=%s' %  msvcver,
-                DebugSettings = (dbgSettings, {}))
-</example_commands> </summary> </builder> <builder
-name="MSVSSolution"> <summary> <para>Builds a Microsoft Visual Studio solution
-file. </para> <para>This builds a Visual Studio solution file, based on the
-version of Visual Studio that is configured (either the latest installed
-version, or the version specified by &cv-link-MSVS_VERSION; in the
-construction environment). For Visual Studio 6, it will generate a
-<filename>.dsw</filename> file. For Visual Studio 7 (.NET), it will generate a
-<filename>.sln</filename> file. </para> <para> The following values must be
-specified: </para><variablelist>
-    <varlistentry>
-      <term>target</term>
-
-      <listitem>
-        <para>The name of the target .dsw or .sln file. The correct
-        suffix for the version of Visual Studio must be used, but the value
-        &cv-link-MSVSSOLUTIONSUFFIX; will be defined to the correct value (see
-        example below).</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>variant</term>
-
-      <listitem>
-        <para>The name of this particular variant, or a list of variant
-        names (the latter is only supported for MSVS 7 solutions). These are
-        typically things like "Debug" or "Release", but really can be anything
-        you want. For MSVS 7 they may also specify target platform, like this
-        "Debug|Xbox". Default platform is Win32.</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>projects</term>
-
-      <listitem>
-        <para>A list of project file names, or Project nodes returned by
-        calls to the &b-MSVSProject; Builder, to be placed into the solution
-        file. It should be noted that these file names are NOT added to the
-        $SOURCES environment variable in form of files, but rather as strings.
-        This is because they represent file names to be added to the solution
-        file, not the source files used to build the solution
-        file.</para>
-      </listitem>
-    </varlistentry>
-  </variablelist> <para> Example Usage: </para> <example_commands>
-env.MSVSSolution(target = 'Bar' + env['MSVSSOLUTIONSUFFIX'], projects = ['bar'
-+ env['MSVSPROJECTSUFFIX']], variant = 'Release')
-</example_commands></summary></builder> <cvar name="MSVS"> <summary> <para>
-When the Microsoft Visual Studio tools are initialized, they set up this
-dictionary with the following keys: </para><variablelist>
-    <varlistentry>
-      <term>VERSION</term>
-
-      <listitem>
-        <para>the version of MSVS being used (can be set via
-        &cv-link-MSVS_VERSION;)</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>VERSIONS</term>
-
-      <listitem>
-        <para>the available versions of MSVS installed</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>VCINSTALLDIR</term>
-
-      <listitem>
-        <para>installed directory of Visual C++</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>VSINSTALLDIR</term>
-
-      <listitem>
-        <para>installed directory of Visual Studio</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>FRAMEWORKDIR</term>
-
-      <listitem>
-        <para>installed directory of the .NET framework</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>FRAMEWORKVERSIONS</term>
-
-      <listitem>
-        <para>list of installed versions of the .NET framework, sorted
-        latest to oldest.</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>FRAMEWORKVERSION</term>
-
-      <listitem>
-        <para>latest installed version of the .NET
-        framework</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>FRAMEWORKSDKDIR</term>
-
-      <listitem>
-        <para>installed location of the .NET SDK.</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>PLATFORMSDKDIR</term>
-
-      <listitem>
-        <para>installed location of the Platform SDK.</para>
-      </listitem>
-    </varlistentry>
-
-    <varlistentry>
-      <term>PLATFORMSDK_MODULES</term>
-
-      <listitem>
-        <para>dictionary of installed Platform SDK modules, where the
-        dictionary keys are keywords for the various modules, and the values
-        are 2-tuples where the first is the release date, and the second is
-        the version number.</para>
-      </listitem>
-    </varlistentry>
-  </variablelist><para>If a value isn't set, it wasn't available in the
-registry.</para></summary></cvar> <cvar name="MSVS_ARCH"> <summary> <para>Sets
-the architecture for which the generated project(s) should build. </para>
-<para>The default value is <literal>x86</literal>. <literal>amd64</literal> is
-also supported by &SCons; for some Visual Studio versions. Trying to set
-&cv-MSVS_ARCH; to an architecture that's not supported for a given Visual
-Studio version will generate an error. </para> </summary> </cvar> <cvar
-name="MSVS_PROJECT_GUID"> <summary> <para>The string placed in a generated
+dll = env.SharedLibrary(target='bar.dll',
+                        source=barsrcs)
+
+env.MSVSProject(target='Bar' + env['MSVSPROJECTSUFFIX'],
+                srcs=barsrcs,
+                incs=barincs,
+                localincs=barlocalincs,
+                resources=barresources,
+                misc=barmisc,
+                buildtarget=[dll[0]] * 2,
+                variant=('Debug|Win32', 'Release|Win32'),
+                cmdargs='vc=%s' %  msvcver,
+                DebugSettings=(dbgSettings, {}))
+      </example_commands>
+    </summary>
+  </builder>
+  <builder name="MSVSSolution">
+    <summary>
+      <para>Builds a Microsoft Visual Studio solution file.</para>
+      <para>
+        This builds a Visual Studio solution file, based on the
+        version of Visual Studio that is configured (either the
+        latest installed version, or the version specified by
+        &cv-link-MSVS_VERSION; in the construction environment). For
+        Visual Studio 6, it will generate a <filename>.dsw</filename>
+        file. For Visual Studio 7 (.NET), it will generate a
+        <filename>.sln</filename> file.
+      </para>
+      <para>The following values must be specified:</para>
+      <variablelist>
+        <varlistentry>
+          <term>target</term>
+          <listitem>
+            <para>
+              The name of the target .dsw or .sln file. The correct
+              suffix for the version of Visual Studio must be used,
+              but the value &cv-link-MSVSSOLUTIONSUFFIX; will be
+              defined to the correct value (see example below).
+            </para>
+          </listitem>
+        </varlistentry> <varlistentry>
+          <term>variant</term> <listitem>
+            <para>
+              The name of this particular variant, or a list of
+              variant names (the latter is only supported for MSVS
+              7 solutions). These are typically things like "Debug"
+              or "Release", but really can be anything you want. For
+              MSVS 7 they may also specify target platform, like this
+              "Debug|Xbox". Default platform is Win32.
+            </para>
+          </listitem>
+        </varlistentry> <varlistentry>
+          <term>projects</term> <listitem>
+            <para>
+              A list of project file names, or Project nodes returned
+              by calls to the &b-MSVSProject; Builder, to be placed
+              into the solution file. It should be noted that these
+              file names are NOT added to the $SOURCES environment
+              variable in form of files, but rather as strings.
+              This is because they represent file names to be added
+              to the solution file, not the source files used to
+              build the solution file.
+            </para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+      <para>Example Usage:</para>
+      <example_commands>
+env.MSVSSolution(target='Bar' + env['MSVSSOLUTIONSUFFIX'], projects=['bar' + env['MSVSPROJECTSUFFIX']], variant='Release')
+      </example_commands>
+    </summary>
+  </builder> <cvar name="MSVS">
+    <summary>
+      <para>
+        When the Microsoft Visual Studio tools are initialized,
+        they set up this dictionary with the following keys:
+      </para>
+      <variablelist>
+        <varlistentry>
+          <term>VERSION</term> <listitem>
+            <para>the version of MSVS being used (can be set via
+            &cv-link-MSVS_VERSION;)</para>
+          </listitem>
+        </varlistentry> <varlistentry>
+          <term>VERSIONS</term> <listitem>
+            <para>the available versions of MSVS installed</para>
+          </listitem>
+        </varlistentry> <varlistentry>
+          <term>VCINSTALLDIR</term> <listitem>
+            <para>installed directory of Visual C++</para>
+          </listitem>
+        </varlistentry> <varlistentry>
+          <term>VSINSTALLDIR</term> <listitem>
+            <para>installed directory of Visual Studio</para>
+          </listitem>
+        </varlistentry> <varlistentry>
+          <term>FRAMEWORKDIR</term> <listitem>
+            <para>installed directory of the .NET framework</para>
+          </listitem>
+        </varlistentry> <varlistentry>
+          <term>FRAMEWORKVERSIONS</term> <listitem>
+            <para>
+              list of installed versions of the .NET framework,
+              sorted latest to oldest.
+            </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>FRAMEWORKVERSION</term>
+          <listitem>
+            <para>latest installed version of the .NET framework</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>FRAMEWORKSDKDIR</term>
+          <listitem>
+            <para>installed location of the .NET SDK.</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>PLATFORMSDKDIR</term>
+          <listitem>
+            <para>installed location of the Platform SDK.</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>PLATFORMSDK_MODULES</term>
+          <listitem>
+            <para>
+              dictionary of installed Platform SDK modules, where the
+              dictionary keys are keywords for the various modules,
+              and the values are 2-tuples where the first is the
+              release date, and the second is the version number.
+            </para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+      <para>If a value is not set, it was not available in the registry.</para>
+    </summary>
+  </cvar> <cvar name="MSVS_ARCH">
+    <summary>
+      <para>Sets the architecture for which the generated project(s) should build.</para>
+      <para>
+        The default value is <literal>x86</literal>.
+        <literal>amd64</literal> is also supported by &SCons; for
+        most Visual Studio versions. Since Visual Studio 2015
+        <literal>arm</literal> is supported, and since Visual Studio
+        2017 <literal>arm64</literal> is supported.
+        Trying to set &cv-MSVS_ARCH;
+        to an architecture that's not supported for a given Visual
+        Studio version will generate an error.
+      </para>
+    </summary>
+  </cvar> <cvar name="MSVS_PROJECT_GUID">
+    <summary>
+      <para>
+        The string placed in a generated
 Microsoft Visual Studio project file as the value of the
-<literal>ProjectGUID</literal> attribute. There is no default value. If not
-defined, a new GUID is generated. </para> </summary> </cvar> <cvar
-name="MSVS_SCC_AUX_PATH"> <summary> <para>The path name placed in a generated
+        <literal>ProjectGUID</literal> attribute. There is no default
+        value. If not
+defined, a new GUID is generated.
+
+      </para>
+    </summary>
+  </cvar> <cvar name="MSVS_SCC_AUX_PATH">
+    <summary>
+      <para>
+        The path name placed in a generated
 Microsoft Visual Studio project file as the value of the
-<literal>SccAuxPath</literal> attribute if the
-<envar>MSVS_SCC_PROVIDER</envar> construction variable is also set. There is
-no default value. </para> </summary> </cvar> <cvar
-name="MSVS_SCC_CONNECTION_ROOT"> <summary> <para>The root path of projects in
-your SCC workspace, i.e the path under which all project and solution files
-will be generated. It is used as a reference path from which the relative
-paths of the generated Microsoft Visual Studio project and solution files are
-computed. The relative project file path is placed as the value of the
-<literal>SccLocalPath</literal> attribute of the project file and as the
-values of the
-<literal>SccProjectFilePathRelativizedFromConnection[i]</literal> (where [i]
-ranges from 0 to the number of projects in the solution) attributes of the
-<literal>GlobalSection(SourceCodeControl)</literal> section of the Microsoft
-Visual Studio solution file. Similarly the relative solution file path is
-placed as the values of the <literal>SccLocalPath[i]</literal> (where [i]
-ranges from 0 to the number of projects in the solution) attributes of the
-<literal>GlobalSection(SourceCodeControl)</literal> section of the Microsoft
-Visual Studio solution file. This is used only if the
-<envar>MSVS_SCC_PROVIDER</envar> construction variable is also set. The
-default value is the current working directory. </para> </summary> </cvar>
-<cvar name="MSVS_SCC_PROJECT_NAME"> <summary> <para>The project name placed in
-a generated Microsoft Visual Studio project file as the value of the
-<literal>SccProjectName</literal> attribute if the
-<envar>MSVS_SCC_PROVIDER</envar> construction variable is also set. In this
-case the string is also placed in the <literal>SccProjectName0</literal>
-attribute of the <literal>GlobalSection(SourceCodeControl)</literal> section
-of the Microsoft Visual Studio solution file. There is no default value.
-</para> </summary> </cvar> <cvar name="MSVS_SCC_PROVIDER"> <summary> <para>The
-string placed in a generated Microsoft Visual Studio project file as the value
-of the <literal>SccProvider</literal> attribute. The string is also placed in
-the <literal>SccProvider0</literal> attribute of the
-<literal>GlobalSection(SourceCodeControl)</literal> section of the Microsoft
-Visual Studio solution file. There is no default value. </para> </summary>
-</cvar> <cvar name="MSVS_VERSION"> <summary> <para>Sets the preferred version
-of Microsoft Visual Studio to use. </para> <para>If &cv-MSVS_VERSION; is not
-set, &SCons; will (by default) select the latest version of Visual Studio
-installed on your system. So, if you have version 6 and version 7 (MSVS .NET)
-installed, it will prefer version 7. You can override this by specifying the
-<envar>MSVS_VERSION</envar> variable in the Environment initialization,
-setting it to the appropriate version ('6.0' or '7.0', for example). If the
-specified version isn't installed, tool initialization will fail. </para>
-<para>This is obsolete: use &cv-MSVC_VERSION; instead. If &cv-MSVS_VERSION; is
-set and &cv-MSVC_VERSION; is not, &cv-MSVC_VERSION; will be set automatically
-to &cv-MSVS_VERSION;. If both are set to different values, scons will raise an
-error. </para> </summary> </cvar> <cvar name="MSVSBUILDCOM"> <summary>
-<para>The build command line placed in a generated Microsoft Visual Studio
-project file. The default is to have Visual Studio invoke SCons with any
-specified build targets. </para> </summary> </cvar> <cvar name="MSVSCLEANCOM">
-<summary> <para>The clean command line placed in a generated Microsoft Visual
-Studio project file. The default is to have Visual Studio invoke SCons with
-the -c option to remove any specified targets. </para> </summary> </cvar>
-<cvar name="MSVSENCODING"> <summary> <para>The encoding string placed in a
-generated Microsoft Visual Studio project file. The default is encoding
-<literal>Windows-1252</literal>. </para> </summary> </cvar> <cvar
-name="MSVSPROJECTCOM"> <summary> <para>The action used to generate Microsoft
-Visual Studio project files. </para> </summary> </cvar> <cvar
-name="MSVSPROJECTSUFFIX"> <summary> <para>The suffix used for Microsoft Visual
-Studio project (DSP) files. The default value is <filename>.vcproj</filename>
-when using Visual Studio version 7.x (.NET) or later version, and
-<filename>.dsp</filename> when using earlier versions of Visual Studio.
-</para> </summary> </cvar> <cvar name="MSVSREBUILDCOM"> <summary> <para>The
-rebuild command line placed in a generated Microsoft Visual Studio project
-file. The default is to have Visual Studio invoke SCons with any specified
-rebuild targets. </para> </summary> </cvar> <cvar name="MSVSSCONS"> <summary>
-<para>The SCons used in generated Microsoft Visual Studio project files. The
-default is the version of SCons being used to generate the project file.
-</para> </summary> </cvar> <cvar name="MSVSSCONSFLAGS"> <summary> <para>The
-SCons flags used in generated Microsoft Visual Studio project files. </para>
-</summary> </cvar> <cvar name="MSVSSCONSCOM"> <summary> <para>The default
-SCons command used in generated Microsoft Visual Studio project files. </para>
-</summary> </cvar> <cvar name="MSVSSCONSCRIPT"> <summary> <para>The sconscript
-file (that is, &SConstruct; or &SConscript; file) that will be invoked by
-Visual Studio project files (through the &cv-link-MSVSSCONSCOM; variable). The
-default is the same sconscript file that contains the call to &b-MSVSProject;
-to build the project file. </para> </summary> </cvar> <cvar
-name="MSVSSOLUTIONCOM"> <summary> <para>The action used to generate Microsoft
-Visual Studio solution files. </para> </summary> </cvar> <cvar
-name="MSVSSOLUTIONSUFFIX"> <summary> <para>The suffix used for Microsoft
-Visual Studio solution (DSW) files. The default value is
-<filename>.sln</filename> when using Visual Studio version 7.x (.NET), and
-<filename>.dsw</filename> when using earlier versions of Visual Studio.
-</para> </summary> </cvar> <cvar name="SCONS_HOME"> <summary> <para>The
-(optional) path to the SCons library directory, initialized from the external
-environment. If set, this is used to construct a shorter and more efficient
-search path in the &cv-link-MSVSSCONS; command line executed from Microsoft
-Visual Studio project files. </para> </summary> </cvar></sconsdoc>
+        <literal>SccAuxPath</literal> attribute if the
+        <envar>MSVS_SCC_PROVIDER</envar> construction variable is
+        also set. There is
+no default value.
+
+      </para>
+    </summary>
+  </cvar> <cvar name="MSVS_SCC_CONNECTION_ROOT">
+    <summary>
+      <para>
+        The root path of projects in your SCC workspace, i.e the
+        path under which all project and solution files will be
+        generated. It is used as a reference path from which the
+        relative paths of the generated Microsoft Visual Studio project
+        and solution files are computed. The relative project file path
+        is placed as the value of the <literal>SccLocalPath</literal>
+        attribute of the project file and as the values of the
+        <literal>SccProjectFilePathRelativizedFromConnection[i]</literal>
+        (where [i] ranges from 0 to the number of projects in the solution)
+        attributes of the <literal>GlobalSection(SourceCodeControl)</literal>
+        section of the Microsoft Visual Studio solution file. Similarly
+        the relative solution file path is placed as the values of the
+        <literal>SccLocalPath[i]</literal> (where [i] ranges from 0
+        to the number of projects in the solution) attributes of the
+        <literal>GlobalSection(SourceCodeControl)</literal> section of
+        the Microsoft Visual Studio solution file. This is used only if
+        the <envar>MSVS_SCC_PROVIDER</envar> construction variable is
+        also set. The default value is the current working directory.
+      </para>
+    </summary>
+  </cvar> <cvar name="MSVS_SCC_PROJECT_NAME">
+    <summary>
+      <para>
+        The project name placed in a generated Microsoft
+        Visual Studio project file as the value of the
+        <literal>SccProjectName</literal> attribute if the
+        <envar>MSVS_SCC_PROVIDER</envar> construction variable
+        is also set. In this case the string is also placed in
+        the <literal>SccProjectName0</literal> attribute of the
+        <literal>GlobalSection(SourceCodeControl)</literal> section
+        of the Microsoft Visual Studio solution file. There is no
+        default value.
+      </para>
+    </summary>
+  </cvar> <cvar name="MSVS_SCC_PROVIDER">
+    <summary>
+      <para>
+        The string placed in a generated Microsoft
+        Visual Studio project file as the value of the
+        <literal>SccProvider</literal> attribute. The string is
+        also placed in the <literal>SccProvider0</literal> attribute
+        of the <literal>GlobalSection(SourceCodeControl)</literal>
+        section of the Microsoft Visual Studio solution file. There
+        is no default value.
+      </para>
+    </summary>
+  </cvar> <cvar name="MSVS_VERSION">
+    <summary>
+      <para>Sets the preferred version of Microsoft Visual Studio to use.</para>
+      <para>
+        If &cv-MSVS_VERSION; is not set, &SCons; will (by default)
+        select the latest version of Visual Studio installed on your
+        system. So, if you have version 6 and version 7 (MSVS .NET)
+        installed, it will prefer version 7. You can override this by
+        specifying the <envar>MSVS_VERSION</envar> variable in the
+        Environment initialization, setting it to the appropriate
+        version ('6.0' or '7.0', for example). If the specified
+        version isn't installed, tool initialization will fail.
+      </para>
+      <para>
+        This is obsolete: use &cv-MSVC_VERSION; instead. If
+        &cv-MSVS_VERSION; is set and &cv-MSVC_VERSION; is
+        not, &cv-MSVC_VERSION; will be set automatically to
+        &cv-MSVS_VERSION;. If both are set to different values,
+        scons will raise an error.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSBUILDCOM">
+    <summary>
+      <para>
+        The build command line placed in a generated Microsoft Visual
+        Studio project file. The default is to have Visual Studio
+        invoke SCons with any specified build targets.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSCLEANCOM">
+    <summary>
+      <para>
+        The clean command line placed in a generated Microsoft Visual
+        Studio project file. The default is to have Visual Studio
+        invoke SCons with the -c option to remove any specified
+        targets.
+      </para>
+    </summary>
+  </cvar> <cvar name="MSVSENCODING">
+    <summary>
+      <para>
+        The encoding string placed in a generated Microsoft
+        Visual Studio project file. The default is encoding
+        <literal>Windows-1252</literal>.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSPROJECTCOM">
+    <summary>
+      <para>The action used to generate Microsoft Visual Studio project files.</para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSPROJECTSUFFIX">
+    <summary>
+      <para>
+        The suffix used for Microsoft Visual Studio project (DSP)
+        files. The default value is <filename>.vcproj</filename>
+        when using Visual Studio version 7.x (.NET) or later version,
+        and <filename>.dsp</filename> when using earlier versions of
+        Visual Studio.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSREBUILDCOM">
+    <summary>
+      <para>
+        The rebuild command line placed in a generated Microsoft
+        Visual Studio project file. The default is to have Visual
+        Studio invoke SCons with any specified rebuild targets.
+
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSSCONS">
+    <summary>
+      <para>
+        The SCons used in generated Microsoft Visual Studio project
+        files. The default is the version of SCons being used to
+        generate the project file.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSSCONSFLAGS">
+    <summary>
+      <para>
+        The SCons flags used in generated Microsoft Visual Studio project files.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSSCONSCOM">
+    <summary>
+      <para>
+        The default SCons command used in generated Microsoft Visual
+        Studio project files.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSSCONSCRIPT">
+    <summary>
+      <para>
+        The sconscript file (that is, &SConstruct; or &SConscript;
+        file) that will be invoked by Visual Studio project files
+        (through the &cv-link-MSVSSCONSCOM; variable). The default
+        is the same sconscript file that contains the call to
+        &b-MSVSProject; to build the project file.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="MSVSSOLUTIONCOM">
+    <summary>
+      <para>The action used to generate Microsoft Visual Studio solution files.</para>
+    </summary>
+  </cvar> <cvar name="MSVSSOLUTIONSUFFIX">
+    <summary>
+      <para>
+        The suffix used for Microsoft Visual Studio solution (DSW)
+        files. The default value is <filename>.sln</filename>
+        when using Visual Studio version 7.x (.NET), and
+        <filename>.dsw</filename> when using earlier versions of
+        Visual Studio.
+      </para>
+    </summary>
+  </cvar>
+  <cvar name="SCONS_HOME">
+    <summary>
+      <para>
+        The (optional) path to the SCons library directory,
+        initialized from the external environment. If set, this is
+        used to construct a shorter and more efficient search path in
+        the &cv-link-MSVSSCONS; command line executed from Microsoft
+        Visual Studio project files.
+      </para>
+    </summary>
+  </cvar>
+</sconsdoc>
diff --git a/src/engine/SCons/Tool/msvsTests.py b/src/engine/SCons/Tool/msvsTests.py
index 8c09487..fd5e343 100644
--- a/src/engine/SCons/Tool/msvsTests.py
+++ b/src/engine/SCons/Tool/msvsTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -22,7 +22,7 @@
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/msvsTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/msvsTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import sys
@@ -482,8 +482,8 @@ class DummyRegistry(object):
     def parse(self, data):
         parents = [None, None]
         parents[0] = self.root
-        keymatch = re.compile('^\[(.*)\]$')
-        valmatch = re.compile('^(?:"(.*)"|[@])="(.*)"$')
+        keymatch = re.compile(r'^\[(.*)\]$')
+        valmatch = re.compile(r'^(?:"(.*)"|[@])="(.*)"$')
         for line in data:
             m1 = keymatch.match(line)
             if m1:
@@ -540,6 +540,10 @@ def DummyQueryValue(key, value):
 def DummyExists(path):
     return 1
 
+def DummyVsWhere(msvc_version):
+    # not testing versions with vswhere, so return none
+    return None
+
 class msvsTestCase(unittest.TestCase):
     """This test case is run several times with different defaults.
     See its subclasses below."""
@@ -809,6 +813,7 @@ if __name__ == "__main__":
     SCons.Util.RegEnumKey      = DummyEnumKey
     SCons.Util.RegEnumValue    = DummyEnumValue
     SCons.Util.RegQueryValueEx = DummyQueryValue
+    SCons.Tool.MSCommon.vc.find_vc_pdir_vswhere = DummyVsWhere
 
     os.path.exists = DummyExists # make sure all files exist :-)
     os.path.isfile = DummyExists # make sure all files are files :-)
diff --git a/src/engine/SCons/Tool/mwcc.py b/src/engine/SCons/Tool/mwcc.py
index 566f812..5cad127 100644
--- a/src/engine/SCons/Tool/mwcc.py
+++ b/src/engine/SCons/Tool/mwcc.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mwcc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/mwcc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
diff --git a/src/engine/SCons/Tool/mwcc.xml b/src/engine/SCons/Tool/mwcc.xml
index 39e6dfa..e9f210c 100644
--- a/src/engine/SCons/Tool/mwcc.xml
+++ b/src/engine/SCons/Tool/mwcc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/mwld.py b/src/engine/SCons/Tool/mwld.py
index 9abeeb5..7d7341a 100644
--- a/src/engine/SCons/Tool/mwld.py
+++ b/src/engine/SCons/Tool/mwld.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mwld.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/mwld.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Tool
 
diff --git a/src/engine/SCons/Tool/mwld.xml b/src/engine/SCons/Tool/mwld.xml
index 993fefe..261a039 100644
--- a/src/engine/SCons/Tool/mwld.xml
+++ b/src/engine/SCons/Tool/mwld.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/nasm.py b/src/engine/SCons/Tool/nasm.py
index c605cc6..8871ab6 100644
--- a/src/engine/SCons/Tool/nasm.py
+++ b/src/engine/SCons/Tool/nasm.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/nasm.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/nasm.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/nasm.xml b/src/engine/SCons/Tool/nasm.xml
index 1834b34..6626411 100644
--- a/src/engine/SCons/Tool/nasm.xml
+++ b/src/engine/SCons/Tool/nasm.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/packaging.xml b/src/engine/SCons/Tool/packaging.xml
index ea39115..9b46000 100644
--- a/src/engine/SCons/Tool/packaging.xml
+++ b/src/engine/SCons/Tool/packaging.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/packaging/__init__.py b/src/engine/SCons/Tool/packaging/__init__.py
index b844afb..513e672 100644
--- a/src/engine/SCons/Tool/packaging/__init__.py
+++ b/src/engine/SCons/Tool/packaging/__init__.py
@@ -4,7 +4,7 @@ SCons Packaging Tool.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -25,18 +25,23 @@ SCons Packaging Tool.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/packaging/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
+import SCons.Defaults
 import SCons.Environment
 from SCons.Variables import *
 from SCons.Errors import *
 from SCons.Util import is_List, make_path_relative
 from SCons.Warnings import warn, Warning
 
-import os, imp
-import SCons.Defaults
+import os
+import imp
 
-__all__ = [ 'src_targz', 'src_tarbz2', 'src_zip', 'tarbz2', 'targz', 'zip', 'rpm', 'msi', 'ipk' ]
+__all__ = [
+    'src_targz', 'src_tarbz2', 'src_xz', 'src_zip',
+    'targz', 'tarbz2', 'xz', 'zip',
+    'rpm', 'msi', 'ipk',
+]
 
 #
 # Utility and Builder function
@@ -102,7 +107,7 @@ def Package(env, target=None, source=None, **kw):
         from SCons.Script import GetOption
         kw['PACKAGETYPE'] = GetOption('package_type')
 
-    if kw['PACKAGETYPE'] == None:
+    if kw['PACKAGETYPE'] is None:
         if 'Tar' in env['BUILDERS']:
             kw['PACKAGETYPE']='targz'
         elif 'Zip' in env['BUILDERS']:
@@ -163,15 +168,22 @@ def Package(env, target=None, source=None, **kw):
         # this exception means that a needed argument for the packager is
         # missing. As our packagers get their "tags" as named function
         # arguments we need to find out which one is missing.
-        from inspect import getargspec
-        args,varargs,varkw,defaults=getargspec(packager.package)
-        if defaults!=None:
-            args=args[:-len(defaults)] # throw away arguments with default values
+        #TODO: getargspec deprecated in Py3. cleanup when Py2.7 dropped.
+        try:
+            from inspect import getfullargspec
+            argspec = getfullargspec(packager.package)
+        except ImportError:
+            from inspect import getargspec
+            argspec = getargspec(packager.package)
+        args = argspec.args
+        if argspec.defaults:
+            # throw away arguments with default values
+            args = args[:-len(argspec.defaults)]
         args.remove('env')
         args.remove('target')
         args.remove('source')
         # now remove any args for which we have a value in kw.
-        args=[x for x in args if x not in kw]
+        args = [x for x in args if x not in kw]
 
         if len(args)==0:
             raise # must be a different error, so re-raise
@@ -283,10 +295,9 @@ def stripinstallbuilder(target, source, env):
     It also warns about files which have no install builder attached.
     """
     def has_no_install_location(file):
-        return not (file.has_builder() and\
-            hasattr(file.builder, 'name') and\
-            (file.builder.name=="InstallBuilder" or\
-             file.builder.name=="InstallAsBuilder"))
+        return not (file.has_builder() and hasattr(file.builder, 'name')
+                    and file.builder.name in ["InstallBuilder", "InstallAsBuilder"])
+
 
     if len([src for src in source if has_no_install_location(src)]):
         warn(Warning, "there are files to package which have no\
diff --git a/src/engine/SCons/Tool/packaging/__init__.xml b/src/engine/SCons/Tool/packaging/__init__.xml
index 0ee0f6b..1643def 100644
--- a/src/engine/SCons/Tool/packaging/__init__.xml
+++ b/src/engine/SCons/Tool/packaging/__init__.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -64,13 +64,15 @@ the following packagers available:
 
 <para>
  * msi - Microsoft Installer
- * rpm - Redhat Package Manger
+ * rpm - RPM Package Manger
  * ipkg - Itsy Package Management System
- * tarbz2 - compressed tar
- * targz - compressed tar
+ * tarbz2 - bzip2 compressed tar
+ * targz - gzip compressed tar
+ * tarxz - xz compressed tar
  * zip - zip file
- * src_tarbz2 - compressed tar source
- * src_targz - compressed tar source
+ * src_tarbz2 - bzip2 compressed tar source
+ * src_targz - gzip compressed tar source
+ * src_tarxz - xz compressed tar source
  * src_zip - zip file source
 </para>
 
@@ -106,7 +108,9 @@ This is used to fill in the
 <literal>Architecture:</literal>
 field in an Ipkg
 <filename>control</filename> file,
-and as part of the name of a generated RPM file.
+and the <literal>BuildArch:</literal> field
+in the RPM <filename>.spec</filename> file,
+as well as forming part of the name of a generated RPM package file.
 </para>
 </summary>
 </cvar>
@@ -120,7 +124,6 @@ the <filename>control</filename> for Ipkg,
 the <filename>.wxs</filename> for MSI).
 If set, the function will be called
 after the SCons template for the file has been written.
-XXX
 </para>
 </summary>
 </cvar>
@@ -164,10 +167,10 @@ section of an RPM
 <cvar name="LICENSE">
 <summary>
 <para>
-The abbreviated name of the license under which
-this project is released (gpl, lpgl, bsd etc.).
+The abbreviated name, preferably the SPDX code, of the license under which
+this project is released (GPL-3.0, LGPL-2.1, BSD-2-Clause etc.).
 See http://www.opensource.org/licenses/alphabetical
-for a list of license names.
+for a list of license names and SPDX codes.
 </para>
 </summary>
 </cvar>
@@ -383,6 +386,7 @@ This is used to fill in the
 <literal>BuildRequires:</literal>
 field in the RPM
 <filename>.spec</filename> file.
+Note this should only be used on a host managed by rpm as the dependencies will not be resolvable at build time otherwise.
 </para>
 </summary>
 </cvar>
@@ -441,7 +445,8 @@ field in the RPM
 <para>
 This is used to fill in the
 <literal>Epoch:</literal>
-field in the controlling information for RPM packages.
+field in the RPM
+<filename>.spec</filename> file.
 </para>
 </summary>
 </cvar>
@@ -468,6 +473,38 @@ field in the RPM
 </summary>
 </cvar>
 
+<cvar name="X_RPM_EXTRADEFS">
+<summary>
+<para>
+A list used to supply extra defintions or flags
+to be added to the RPM <filename>.spec</filename> file.
+Each item is added as-is with a carriage return appended.
+This is useful if some specific RPM feature not otherwise
+anticipated by SCons needs to be turned on or off.
+Note if this variable is omitted, SCons will by
+default supply the value
+<literal>'%global debug_package %{nil}'</literal>
+to disable debug package generation.
+To enable debug package generation, include this
+variable set either to None, or to a custom
+list that does not include the default line.
+Added in version 3.1.
+</para>
+
+<example_commands>
+env.Package(
+    NAME             = 'foo',
+...
+    X_RPM_EXTRADEFS = [
+        '%define _unpackaged_files_terminate_build 0'
+        '%define _missing_doc_files_terminate_build 0'
+    ],
+... )
+</example_commands>
+
+</summary>
+</cvar>
+
 <cvar name="X_RPM_GROUP">
 <summary>
 <para>
diff --git a/src/engine/SCons/Tool/packaging/ipk.py b/src/engine/SCons/Tool/packaging/ipk.py
index 71fa2b0..60cd3cb 100644
--- a/src/engine/SCons/Tool/packaging/ipk.py
+++ b/src/engine/SCons/Tool/packaging/ipk.py
@@ -2,7 +2,7 @@
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -24,11 +24,13 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/ipk.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/ipk.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
+
+import os
 
 import SCons.Builder
 import SCons.Node.FS
-import os
+import SCons.Util
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
@@ -119,7 +121,9 @@ def build_specfiles(source, target, env):
         try:
             return opened_files[needle]
         except KeyError:
-            file=filter(lambda x: x.get_path().rfind(needle)!=-1, haystack)[0]
+            files = filter(lambda x: x.get_path().rfind(needle) != -1, haystack)
+            # Py3: filter returns an iterable, not a list
+            file = list(files)[0]
             opened_files[needle]=open(file.get_abspath(), 'w')
             return opened_files[needle]
 
diff --git a/src/engine/SCons/Tool/packaging/msi.py b/src/engine/SCons/Tool/packaging/msi.py
index 827ce76..4e8724b 100644
--- a/src/engine/SCons/Tool/packaging/msi.py
+++ b/src/engine/SCons/Tool/packaging/msi.py
@@ -4,7 +4,7 @@ The msi packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -25,7 +25,7 @@ The msi packager.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/packaging/msi.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/msi.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import SCons
@@ -63,8 +63,8 @@ def convert_to_id(s, id_set):
     """
     charset = 'ABCDEFGHIJKLMNOPQRSTUVWXYabcdefghijklmnopqrstuvwxyz0123456789_.'
     if s[0] in '0123456789.':
-        s += '_'+s
-    id = [c for c in s if c in charset]
+        s = '_' + s
+    id = ''.join([c for c in s if c in charset])
 
     # did we already generate an id for this file?
     try:
@@ -108,14 +108,13 @@ def gen_dos_short_file_name(file, filename_set):
 
     # strip forbidden characters.
     forbidden = '."/[]:;=, '
-    fname = [c for c in fname if c not in forbidden]
+    fname = ''.join([c for c in fname if c not in forbidden])
 
     # check if we already generated a filename with the same number:
     # thisis1.txt, thisis2.txt etc.
     duplicate, num = not None, 1
     while duplicate:
-        shortname = "%s%s" % (fname[:8-len(str(num))].upper(),\
-                              str(num))
+        shortname = "%s%s" % (fname[:8-len(str(num))].upper(), str(num))
         if len(ext) >= 2:
             shortname = "%s%s" % (shortname, ext[:4].upper())
 
@@ -301,7 +300,7 @@ def build_wxsfile_file_section(root, files, NAME, VERSION, VENDOR, filename_set,
                                if c.nodeName == 'Directory'
                                and c.attributes['LongName'].value == escape(d)] 
 
-            if already_created != []:
+            if already_created:
                 Directory = already_created[0]
                 dir_parts.remove(d)
                 upper_dir += d
diff --git a/src/engine/SCons/Tool/packaging/rpm.py b/src/engine/SCons/Tool/packaging/rpm.py
index 3c48b02..48b9aab 100644
--- a/src/engine/SCons/Tool/packaging/rpm.py
+++ b/src/engine/SCons/Tool/packaging/rpm.py
@@ -4,7 +4,7 @@ The rpm packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -25,7 +25,7 @@ The rpm packager.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/packaging/rpm.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/rpm.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 
@@ -51,10 +51,9 @@ def package(env, target, source, PACKAGEROOT, NAME, VERSION,
     if str(target[0])!="%s-%s"%(NAME, VERSION):
         raise UserError( "Setting target is not supported for rpm." )
     else:
-        # This should be overridable from the construction environment,
-        # which it is by using ARCHITECTURE=.
+        # Deduce the build architecture, but allow it to be overridden
+        # by setting ARCHITECTURE in the construction env.
         buildarchitecture = SCons.Tool.rpmutils.defaultMachine()
-
         if 'ARCHITECTURE' in kw:
             buildarchitecture = kw['ARCHITECTURE']
 
@@ -126,20 +125,18 @@ def build_specfile(target, source, env):
     """ Builds a RPM specfile from a dictionary with string metadata and
     by analyzing a tree of nodes.
     """
-    file = open(target[0].get_abspath(), 'w')
-
-    try:
-        file.write( build_specfile_header(env) )
-        file.write( build_specfile_sections(env) )
-        file.write( build_specfile_filesection(env, source) )
-        file.close()
+    with open(target[0].get_abspath(), 'w') as file:
+        try:
+            file.write(build_specfile_header(env))
+            file.write(build_specfile_sections(env))
+            file.write(build_specfile_filesection(env, source))
 
-        # call a user specified function
-        if 'CHANGE_SPECFILE' in env:
-            env['CHANGE_SPECFILE'](target, source)
+            # call a user specified function
+            if 'CHANGE_SPECFILE' in env:
+                env['CHANGE_SPECFILE'](target, source)
 
-    except KeyError as e:
-        raise SCons.Errors.UserError( '"%s" package field for RPM is missing.' % e.args[0] )
+        except KeyError as e:
+            raise SCons.Errors.UserError('"%s" package field for RPM is missing.' % e.args[0])
 
 
 #
@@ -201,7 +198,8 @@ def build_specfile_header(spec):
         'PACKAGEVERSION' : '%%define release %s\nRelease: %%{release}\n',
         'X_RPM_GROUP'    : 'Group: %s\n',
         'SUMMARY'        : 'Summary: %s\n',
-        'LICENSE'        : 'License: %s\n', }
+        'LICENSE'        : 'License: %s\n',
+    }
 
     str = str + SimpleTagCompiler(mandatory_header_fields).compile( spec )
 
@@ -211,6 +209,7 @@ def build_specfile_header(spec):
         'X_RPM_URL'           : 'Url: %s\n',
         'SOURCE_URL'          : 'Source: %s\n',
         'SUMMARY_'            : 'Summary(%s): %s\n',
+        'ARCHITECTURE'        : 'BuildArch: %s\n',
         'X_RPM_DISTRIBUTION'  : 'Distribution: %s\n',
         'X_RPM_ICON'          : 'Icon: %s\n',
         'X_RPM_PACKAGER'      : 'Packager: %s\n',
@@ -229,19 +228,33 @@ def build_specfile_header(spec):
         'X_RPM_PREFIX'        : 'Prefix: %s\n',
 
         # internal use
-        'X_RPM_BUILDROOT'     : 'BuildRoot: %s\n', }
+        'X_RPM_BUILDROOT'     : 'BuildRoot: %s\n',
+    }
 
     # fill in default values:
-    # Adding a BuildRequires renders the .rpm unbuildable under System, which
+    # Adding a BuildRequires renders the .rpm unbuildable under systems which
     # are not managed by rpm, since the database to resolve this dependency is
     # missing (take Gentoo as an example)
-#    if not s.has_key('x_rpm_BuildRequires'):
-#        s['x_rpm_BuildRequires'] = 'scons'
+    #if 'X_RPM_BUILDREQUIRES' not in spec:
+    #    spec['X_RPM_BUILDREQUIRES'] = 'scons'
 
     if 'X_RPM_BUILDROOT' not in spec:
         spec['X_RPM_BUILDROOT'] = '%{_tmppath}/%{name}-%{version}-%{release}'
 
     str = str + SimpleTagCompiler(optional_header_fields, mandatory=0).compile( spec )
+
+    # Add any extra specfile definitions the user may have supplied.
+    # These flags get no processing, they are just added.
+    # github #3164: if we don't turn off debug package generation
+    # the tests which build packages all fail.  If there are no
+    # extra flags, default to adding this one. If the user wants
+    # to turn this back on, supply the flag set to None.
+
+    if 'X_RPM_EXTRADEFS' not in spec:
+        spec['X_RPM_EXTRADEFS'] = ['%global debug_package %{nil}']
+    for extra in spec['X_RPM_EXTRADEFS']:
+        str += extra + '\n'
+
     return str
 
 #
diff --git a/src/engine/SCons/Tool/packaging/src_tarbz2.py b/src/engine/SCons/Tool/packaging/src_tarbz2.py
index b40e550..473ce75 100644
--- a/src/engine/SCons/Tool/packaging/src_tarbz2.py
+++ b/src/engine/SCons/Tool/packaging/src_tarbz2.py
@@ -1,10 +1,10 @@
-"""SCons.Tool.Packaging.tarbz2
+"""SCons.Tool.Packaging.src_tarbz2
 
 The tarbz2 SRC packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,7 +26,7 @@ The tarbz2 SRC packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/src_tarbz2.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/src_tarbz2.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Tool.packaging import putintopackageroot
 
diff --git a/src/engine/SCons/Tool/packaging/src_targz.py b/src/engine/SCons/Tool/packaging/src_targz.py
index 01fc91a..865b8dd 100644
--- a/src/engine/SCons/Tool/packaging/src_targz.py
+++ b/src/engine/SCons/Tool/packaging/src_targz.py
@@ -1,10 +1,10 @@
-"""SCons.Tool.Packaging.targz
+"""SCons.Tool.Packaging.src_targz
 
 The targz SRC packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,7 +26,7 @@ The targz SRC packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/src_targz.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/src_targz.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Tool.packaging import putintopackageroot
 
diff --git a/src/engine/SCons/Options/BoolOption.py b/src/engine/SCons/Tool/packaging/src_tarxz.py
index 5960a2e..07ffdb0 100644
--- a/src/engine/SCons/Options/BoolOption.py
+++ b/src/engine/SCons/Tool/packaging/src_tarxz.py
@@ -1,5 +1,10 @@
+"""SCons.Tool.Packaging.src_tarxz
+
+The tarxz SRC packager.
+"""
+
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,27 +26,15 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Options/BoolOption.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
-
-__doc__ = """Place-holder for the old SCons.Options module hierarchy
-
-This is for backwards compatibility.  The new equivalent is the Variables/
-class hierarchy.  These will have deprecation warnings added (some day),
-and will then be removed entirely (some day).
-"""
-
-import SCons.Variables
-import SCons.Warnings
+__revision__ = "src/engine/SCons/Tool/packaging/src_tarxz.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
-warned = False
+from SCons.Tool.packaging import putintopackageroot
 
-def BoolOption(*args, **kw):
-    global warned
-    if not warned:
-        msg = "The BoolOption() function is deprecated; use the BoolVariable() function instead."
-        SCons.Warnings.warn(SCons.Warnings.DeprecatedOptionsWarning, msg)
-        warned = True
-    return SCons.Variables.BoolVariable(*args, **kw)
+def package(env, target, source, PACKAGEROOT, **kw):
+    bld = env['BUILDERS']['Tar']
+    bld.set_suffix('.tar.xz')
+    target, source = putintopackageroot(target, source, env, PACKAGEROOT, honor_install_location=0)
+    return bld(env, target, source, TARFLAGS='-Jc')
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/packaging/src_zip.py b/src/engine/SCons/Tool/packaging/src_zip.py
index ea21a87..819e52a 100644
--- a/src/engine/SCons/Tool/packaging/src_zip.py
+++ b/src/engine/SCons/Tool/packaging/src_zip.py
@@ -4,7 +4,7 @@ The zip SRC packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,7 +26,7 @@ The zip SRC packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/src_zip.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/src_zip.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Tool.packaging import putintopackageroot
 
diff --git a/src/engine/SCons/Tool/packaging/tarbz2.py b/src/engine/SCons/Tool/packaging/tarbz2.py
index c919cab..5658de3 100644
--- a/src/engine/SCons/Tool/packaging/tarbz2.py
+++ b/src/engine/SCons/Tool/packaging/tarbz2.py
@@ -1,10 +1,10 @@
 """SCons.Tool.Packaging.tarbz2
 
-The tarbz2 SRC packager.
+The tarbz2 packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,13 +26,13 @@ The tarbz2 SRC packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/tarbz2.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/tarbz2.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
 def package(env, target, source, PACKAGEROOT, **kw):
     bld = env['BUILDERS']['Tar']
-    bld.set_suffix('.tar.gz')
+    bld.set_suffix('.tar.bz2')
     target, source = putintopackageroot(target, source, env, PACKAGEROOT)
     target, source = stripinstallbuilder(target, source, env)
     return bld(env, target, source, TARFLAGS='-jc')
diff --git a/src/engine/SCons/Tool/packaging/targz.py b/src/engine/SCons/Tool/packaging/targz.py
index e9e984e..f515f1e 100644
--- a/src/engine/SCons/Tool/packaging/targz.py
+++ b/src/engine/SCons/Tool/packaging/targz.py
@@ -1,10 +1,10 @@
 """SCons.Tool.Packaging.targz
 
-The targz SRC packager.
+The targz packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,7 +26,7 @@ The targz SRC packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/targz.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/targz.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
diff --git a/src/engine/SCons/Options/EnumOption.py b/src/engine/SCons/Tool/packaging/tarxz.py
index 5e030d9..5f7a8d8 100644
--- a/src/engine/SCons/Options/EnumOption.py
+++ b/src/engine/SCons/Tool/packaging/tarxz.py
@@ -1,5 +1,10 @@
+"""SCons.Tool.Packaging.tarxz
+
+The tarxz packager.
+"""
+
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,27 +26,16 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Options/EnumOption.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
-
-__doc__ = """Place-holder for the old SCons.Options module hierarchy
-
-This is for backwards compatibility.  The new equivalent is the Variables/
-class hierarchy.  These will have deprecation warnings added (some day),
-and will then be removed entirely (some day).
-"""
-
-import SCons.Variables
-import SCons.Warnings
+__revision__ = "src/engine/SCons/Tool/packaging/tarxz.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
-warned = False
+from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
-def EnumOption(*args, **kw):
-    global warned
-    if not warned:
-        msg = "The EnumOption() function is deprecated; use the EnumVariable() function instead."
-        SCons.Warnings.warn(SCons.Warnings.DeprecatedOptionsWarning, msg)
-        warned = True
-    return SCons.Variables.EnumVariable(*args, **kw)
+def package(env, target, source, PACKAGEROOT, **kw):
+    bld = env['BUILDERS']['Tar']
+    bld.set_suffix('.tar.xz')
+    target, source = putintopackageroot(target, source, env, PACKAGEROOT)
+    target, source = stripinstallbuilder(target, source, env)
+    return bld(env, target, source, TARFLAGS='-Jc')
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/packaging/zip.py b/src/engine/SCons/Tool/packaging/zip.py
index 3b80ead..2ae496e 100644
--- a/src/engine/SCons/Tool/packaging/zip.py
+++ b/src/engine/SCons/Tool/packaging/zip.py
@@ -4,7 +4,7 @@ The zip SRC packager.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,7 +26,7 @@ The zip SRC packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/zip.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/packaging/zip.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
diff --git a/src/engine/SCons/Tool/pdf.py b/src/engine/SCons/Tool/pdf.py
index 381732a..da970ff 100644
--- a/src/engine/SCons/Tool/pdf.py
+++ b/src/engine/SCons/Tool/pdf.py
@@ -6,7 +6,7 @@ Add an explicit action to run epstopdf to convert .eps files to .pdf
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -28,7 +28,7 @@ Add an explicit action to run epstopdf to convert .eps files to .pdf
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/pdf.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/pdf.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Builder
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/pdf.xml b/src/engine/SCons/Tool/pdf.xml
index 9688a6f..876de15 100644
--- a/src/engine/SCons/Tool/pdf.xml
+++ b/src/engine/SCons/Tool/pdf.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/pdflatex.py b/src/engine/SCons/Tool/pdflatex.py
index d539770..2a97d0f 100644
--- a/src/engine/SCons/Tool/pdflatex.py
+++ b/src/engine/SCons/Tool/pdflatex.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/pdflatex.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/pdflatex.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Util
diff --git a/src/engine/SCons/Tool/pdflatex.xml b/src/engine/SCons/Tool/pdflatex.xml
index 4dae90b..975d5e9 100644
--- a/src/engine/SCons/Tool/pdflatex.xml
+++ b/src/engine/SCons/Tool/pdflatex.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/pdftex.py b/src/engine/SCons/Tool/pdftex.py
index 06e9d7c..80913ae 100644
--- a/src/engine/SCons/Tool/pdftex.py
+++ b/src/engine/SCons/Tool/pdftex.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/pdftex.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/pdftex.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import SCons.Action
diff --git a/src/engine/SCons/Tool/pdftex.xml b/src/engine/SCons/Tool/pdftex.xml
index e84296a..0a265e7 100644
--- a/src/engine/SCons/Tool/pdftex.xml
+++ b/src/engine/SCons/Tool/pdftex.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/qt.py b/src/engine/SCons/Tool/qt.py
index e7c1b95..e8b0325 100644
--- a/src/engine/SCons/Tool/qt.py
+++ b/src/engine/SCons/Tool/qt.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,10 +33,11 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/qt.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/qt.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import re
+import glob
 
 import SCons.Action
 import SCons.Builder
@@ -44,6 +45,8 @@ import SCons.Defaults
 import SCons.Scanner
 import SCons.Tool
 import SCons.Util
+import SCons.Tool.cxx
+cplusplus = SCons.Tool.cxx
 
 class ToolQtWarning(SCons.Warnings.Warning):
     pass
@@ -60,12 +63,33 @@ header_extensions = [".h", ".hxx", ".hpp", ".hh"]
 if SCons.Util.case_sensitive_suffixes('.h', '.H'):
     header_extensions.append('.H')
 
-import SCons.Tool.cxx
-cplusplus = SCons.Tool.cxx
-#cplusplus = __import__('cxx', globals(), locals(), [])
-
 cxx_suffixes = cplusplus.CXXSuffixes
 
+
+#
+def find_platform_specific_qt_paths():
+    """
+    If the platform has non-standard paths which it installs QT in,return the likely default path
+    :return:
+    """
+
+    # qt_bin_dirs = []
+    qt_bin_dir = None
+    if os.path.isfile('/etc/redhat-release'):
+        with open('/etc/redhat-release','r') as rr:
+            lines = rr.readlines()
+            distro = lines[0].split()[0]
+        if distro == 'CentOS':
+            # Centos installs QT under /usr/{lib,lib64}/qt{4,5,-3.3}/bin
+            # so we need to handle this differently
+            # qt_bin_dirs = glob.glob('/usr/lib64/qt*/bin')
+            qt_bin_dir = '/usr/lib64/qt-3.3/bin'
+
+    return qt_bin_dir
+
+
+QT_BIN_DIR = find_platform_specific_qt_paths()
+
 def checkMocIncluded(target, source, env):
     moc = target[0]
     cpp = source[0]
@@ -188,13 +212,12 @@ AutomocStatic = _Automoc('StaticObject')
 
 def _detect(env):
     """Not really safe, but fast method to detect the QT library"""
-    QTDIR = None
-    if not QTDIR:
-        QTDIR = env.get('QTDIR',None)
+
+    QTDIR = env.get('QTDIR',None)
     if not QTDIR:
         QTDIR = os.environ.get('QTDIR',None)
     if not QTDIR:
-        moc = env.WhereIs('moc')
+        moc = env.WhereIs('moc') or env.WhereIs('moc',QT_BIN_DIR)
         if moc:
             QTDIR = os.path.dirname(os.path.dirname(moc))
             SCons.Warnings.warn(
diff --git a/src/engine/SCons/Tool/qt.xml b/src/engine/SCons/Tool/qt.xml
index 86d50d6..560a11d 100644
--- a/src/engine/SCons/Tool/qt.xml
+++ b/src/engine/SCons/Tool/qt.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/rmic.py b/src/engine/SCons/Tool/rmic.py
index 9e1eaee..1d401fd 100644
--- a/src/engine/SCons/Tool/rmic.py
+++ b/src/engine/SCons/Tool/rmic.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/rmic.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/rmic.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
@@ -40,6 +40,9 @@ import SCons.Builder
 import SCons.Node.FS
 import SCons.Util
 
+from SCons.Tool.JavaCommon import get_java_install_dirs
+
+
 def emit_rmic_classes(target, source, env):
     """Create and return lists of Java RMI stub and skeleton
     class files to be created from a set of class files.
@@ -105,6 +108,18 @@ def generate(env):
     """Add Builders and construction variables for rmic to an Environment."""
     env['BUILDERS']['RMIC'] = RMICBuilder
 
+    if env['PLATFORM'] == 'win32':
+        version = env.get('JAVAVERSION', None)
+        default_paths=get_java_install_dirs(env['PLATFORM'], version=version)
+
+        # Ensure that we have a proper path for rmic
+        rmic = SCons.Tool.find_program_path(env, 'rmic', default_paths=default_paths)
+
+        # print("RMIC: %s"%rmic)
+        if rmic:
+            rmic_bin_dir = os.path.dirname(rmic)
+            env.AppendENVPath('PATH', rmic_bin_dir)
+
     env['RMIC']            = 'rmic'
     env['RMICFLAGS']       = SCons.Util.CLVar('')
     env['RMICCOM']         = '$RMIC $RMICFLAGS -d ${TARGET.attributes.java_lookupdir} -classpath ${SOURCE.attributes.java_classdir} ${SOURCES.attributes.java_classname}'
diff --git a/src/engine/SCons/Tool/rmic.xml b/src/engine/SCons/Tool/rmic.xml
index 2b0d42b..2a273d3 100644
--- a/src/engine/SCons/Tool/rmic.xml
+++ b/src/engine/SCons/Tool/rmic.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/rpcgen.py b/src/engine/SCons/Tool/rpcgen.py
index 1f2c66d..349af6a 100644
--- a/src/engine/SCons/Tool/rpcgen.py
+++ b/src/engine/SCons/Tool/rpcgen.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/rpcgen.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/rpcgen.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from SCons.Builder import Builder
 import SCons.Util
@@ -43,7 +43,7 @@ rpcgen_service  = cmd % ('m', '$RPCGENSERVICEFLAGS')
 rpcgen_xdr      = cmd % ('c', '$RPCGENXDRFLAGS')
 
 def generate(env):
-    "Add RPCGEN Builders and construction variables for an Environment."
+    """Add RPCGEN Builders and construction variables for an Environment."""
     
     client  = Builder(action=rpcgen_client,  suffix='_clnt.c', src_suffix='.x')
     header  = Builder(action=rpcgen_header,  suffix='.h',      src_suffix='.x')
diff --git a/src/engine/SCons/Tool/rpcgen.xml b/src/engine/SCons/Tool/rpcgen.xml
index 60f216e..1ee9df9 100644
--- a/src/engine/SCons/Tool/rpcgen.xml
+++ b/src/engine/SCons/Tool/rpcgen.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/rpm.py b/src/engine/SCons/Tool/rpm.py
index 5cd97b3..61e4185 100644
--- a/src/engine/SCons/Tool/rpm.py
+++ b/src/engine/SCons/Tool/rpm.py
@@ -11,7 +11,7 @@ tar.gz consisting of the source file and a specfile.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ tar.gz consisting of the source file and a specfile.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/rpm.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/rpm.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import re
diff --git a/src/engine/SCons/Tool/rpmutils.py b/src/engine/SCons/Tool/rpmutils.py
index f71d664..10bb28d 100644
--- a/src/engine/SCons/Tool/rpmutils.py
+++ b/src/engine/SCons/Tool/rpmutils.py
@@ -14,7 +14,7 @@ exact syntax.
 
 """
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -36,7 +36,7 @@ exact syntax.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/rpmutils.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/rpmutils.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 import platform
diff --git a/src/engine/SCons/Tool/sgiar.py b/src/engine/SCons/Tool/sgiar.py
index a421cc1..152afd4 100644
--- a/src/engine/SCons/Tool/sgiar.py
+++ b/src/engine/SCons/Tool/sgiar.py
@@ -11,7 +11,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sgiar.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sgiar.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/sgiar.xml b/src/engine/SCons/Tool/sgiar.xml
index ffbc80e..6d28475 100644
--- a/src/engine/SCons/Tool/sgiar.xml
+++ b/src/engine/SCons/Tool/sgiar.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sgic++.py b/src/engine/SCons/Tool/sgic++.py
index 7a9b1e9..35f913f 100644
--- a/src/engine/SCons/Tool/sgic++.py
+++ b/src/engine/SCons/Tool/sgic++.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sgic++.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sgic++.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 #forward proxy to the preffered cxx version
 from SCons.Tool.sgicxx import *
diff --git a/src/engine/SCons/Tool/sgic++.xml b/src/engine/SCons/Tool/sgic++.xml
index 03ca3b1..bab0392 100644
--- a/src/engine/SCons/Tool/sgic++.xml
+++ b/src/engine/SCons/Tool/sgic++.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sgicc.py b/src/engine/SCons/Tool/sgicc.py
index e9f561d..c5461e3 100644
--- a/src/engine/SCons/Tool/sgicc.py
+++ b/src/engine/SCons/Tool/sgicc.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sgicc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sgicc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 from . import cc
 
diff --git a/src/engine/SCons/Tool/sgicc.xml b/src/engine/SCons/Tool/sgicc.xml
index 1e12bf3..f26944b 100644
--- a/src/engine/SCons/Tool/sgicc.xml
+++ b/src/engine/SCons/Tool/sgicc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sgicxx.py b/src/engine/SCons/Tool/sgicxx.py
index 61c415b..7656939 100644
--- a/src/engine/SCons/Tool/sgicxx.py
+++ b/src/engine/SCons/Tool/sgicxx.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sgicxx.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sgicxx.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
diff --git a/src/engine/SCons/Tool/sgilink.py b/src/engine/SCons/Tool/sgilink.py
index c327151..366b227 100644
--- a/src/engine/SCons/Tool/sgilink.py
+++ b/src/engine/SCons/Tool/sgilink.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sgilink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sgilink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
diff --git a/src/engine/SCons/Tool/sgilink.xml b/src/engine/SCons/Tool/sgilink.xml
index ede0eed..7cc9818 100644
--- a/src/engine/SCons/Tool/sgilink.xml
+++ b/src/engine/SCons/Tool/sgilink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sunar.py b/src/engine/SCons/Tool/sunar.py
index cd1e18d..6745511 100644
--- a/src/engine/SCons/Tool/sunar.py
+++ b/src/engine/SCons/Tool/sunar.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,7 +32,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sunar.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sunar.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/src/engine/SCons/Tool/sunar.xml b/src/engine/SCons/Tool/sunar.xml
index b97e6a2..97d1a05 100644
--- a/src/engine/SCons/Tool/sunar.xml
+++ b/src/engine/SCons/Tool/sunar.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sunc++.py b/src/engine/SCons/Tool/sunc++.py
index 1219bcf..f1bbf14 100644
--- a/src/engine/SCons/Tool/sunc++.py
+++ b/src/engine/SCons/Tool/sunc++.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sunc++.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sunc++.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 #forward proxy to the preffered cxx version
diff --git a/src/engine/SCons/Tool/sunc++.xml b/src/engine/SCons/Tool/sunc++.xml
index 2e7b220..d1d0160 100644
--- a/src/engine/SCons/Tool/sunc++.xml
+++ b/src/engine/SCons/Tool/sunc++.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/suncc.py b/src/engine/SCons/Tool/suncc.py
index bc4eb4f..49cfa70 100644
--- a/src/engine/SCons/Tool/suncc.py
+++ b/src/engine/SCons/Tool/suncc.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/suncc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/suncc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
diff --git a/src/engine/SCons/Tool/suncc.xml b/src/engine/SCons/Tool/suncc.xml
index 61cfb30..f191eda 100644
--- a/src/engine/SCons/Tool/suncc.xml
+++ b/src/engine/SCons/Tool/suncc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/suncxx.py b/src/engine/SCons/Tool/suncxx.py
index 1545500..1fa5331 100644
--- a/src/engine/SCons/Tool/suncxx.py
+++ b/src/engine/SCons/Tool/suncxx.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/suncxx.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/suncxx.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons
 
diff --git a/src/engine/SCons/Tool/sunf77.py b/src/engine/SCons/Tool/sunf77.py
index 9842d31..1d9487d 100644
--- a/src/engine/SCons/Tool/sunf77.py
+++ b/src/engine/SCons/Tool/sunf77.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sunf77.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sunf77.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
diff --git a/src/engine/SCons/Tool/sunf77.xml b/src/engine/SCons/Tool/sunf77.xml
index 8f6ecaf..fafcb8d 100644
--- a/src/engine/SCons/Tool/sunf77.xml
+++ b/src/engine/SCons/Tool/sunf77.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sunf90.py b/src/engine/SCons/Tool/sunf90.py
index 7245f99..4de62c3 100644
--- a/src/engine/SCons/Tool/sunf90.py
+++ b/src/engine/SCons/Tool/sunf90.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sunf90.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sunf90.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
diff --git a/src/engine/SCons/Tool/sunf90.xml b/src/engine/SCons/Tool/sunf90.xml
index 8f151fe..f979e15 100644
--- a/src/engine/SCons/Tool/sunf90.xml
+++ b/src/engine/SCons/Tool/sunf90.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sunf95.py b/src/engine/SCons/Tool/sunf95.py
index aae8828..6d1ccf6 100644
--- a/src/engine/SCons/Tool/sunf95.py
+++ b/src/engine/SCons/Tool/sunf95.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sunf95.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sunf95.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Util
 
diff --git a/src/engine/SCons/Tool/sunf95.xml b/src/engine/SCons/Tool/sunf95.xml
index a2c77da..4072d36 100644
--- a/src/engine/SCons/Tool/sunf95.xml
+++ b/src/engine/SCons/Tool/sunf95.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/sunlink.py b/src/engine/SCons/Tool/sunlink.py
index 175157f..1eca1b2 100644
--- a/src/engine/SCons/Tool/sunlink.py
+++ b/src/engine/SCons/Tool/sunlink.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/sunlink.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/sunlink.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import os.path
diff --git a/src/engine/SCons/Tool/sunlink.xml b/src/engine/SCons/Tool/sunlink.xml
index b652f5c..68eee54 100644
--- a/src/engine/SCons/Tool/sunlink.xml
+++ b/src/engine/SCons/Tool/sunlink.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/swig.py b/src/engine/SCons/Tool/swig.py
index dedf103..a207a89 100644
--- a/src/engine/SCons/Tool/swig.py
+++ b/src/engine/SCons/Tool/swig.py
@@ -10,7 +10,7 @@ selection method.
 from __future__ import print_function
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -32,9 +32,10 @@ from __future__ import print_function
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/swig.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/swig.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
+import sys
 import re
 import subprocess
 
@@ -69,7 +70,9 @@ def _find_modules(src):
     directors = 0
     mnames = []
     try:
-        matches = _reModule.findall(open(src).read())
+        with open(src) as f:
+            data = f.read()
+        matches = _reModule.findall(data)
     except IOError:
         # If the file's not yet generated, guess the module name from the file stem
         matches = []
@@ -134,21 +137,31 @@ def _swigEmitter(target, source, env):
 
 def _get_swig_version(env, swig):
     """Run the SWIG command line tool to get and return the version number"""
+    version = None
     swig = env.subst(swig)
+    if not swig:
+        return version
     pipe = SCons.Action._subproc(env, SCons.Util.CLVar(swig) + ['-version'],
                                  stdin = 'devnull',
                                  stderr = 'devnull',
                                  stdout = subprocess.PIPE)
-    if pipe.wait() != 0: return
+    if pipe.wait() != 0:
+        return version
 
     # MAYBE:   out = SCons.Util.to_str (pipe.stdout.read())
-    out = SCons.Util.to_str(pipe.stdout.read())
-    match = re.search('SWIG Version\s+(\S+).*', out, re.MULTILINE)
+    with pipe.stdout:
+        out = SCons.Util.to_str(pipe.stdout.read())
+
+    match = re.search(r'SWIG Version\s+(\S+).*', out, re.MULTILINE)
     if match:
-        if verbose: print("Version is:%s"%match.group(1))
-        return match.group(1)
+        version = match.group(1)
+        if verbose:
+            print("Version is: %s" % version)
     else:
-        if verbose: print("Unable to detect version: [%s]"%out)
+        if verbose:
+            print("Unable to detect version: [%s]" % out)
+
+    return version
 
 def generate(env):
     """Add Builders and construction variables for swig to an Environment."""
@@ -169,6 +182,17 @@ def generate(env):
     java_file.add_action('.i', SwigAction)
     java_file.add_emitter('.i', _swigEmitter)
 
+    from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+    from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+
+    if sys.platform == 'win32':
+        swig = SCons.Tool.find_program_path(env, 'swig', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS + [r'C:\ProgramData\chocolatey\bin'] )
+        if swig:
+            swig_bin_dir = os.path.dirname(swig)
+            env.AppendENVPath('PATH', swig_bin_dir)
+        else:
+            SCons.Warnings.Warning('swig tool requested, but binary not found in ENV PATH')
+
     if 'SWIG' not in env:
         env['SWIG'] = env.Detect(swigs) or swigs[0]
     env['SWIGVERSION']       = _get_swig_version(env, env['SWIG'])
diff --git a/src/engine/SCons/Tool/swig.xml b/src/engine/SCons/Tool/swig.xml
index 53d92ef..65a5971 100644
--- a/src/engine/SCons/Tool/swig.xml
+++ b/src/engine/SCons/Tool/swig.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -153,7 +153,8 @@ An automatically-generated construction variable
 containing the SWIG command-line options
 for specifying directories to be searched for included files.
 The value of &cv-_SWIGINCFLAGS; is created
-by appending &cv-SWIGINCPREFIX; and &cv-SWIGINCSUFFIX;
+by respectively prepending and appending
+&cv-SWIGINCPREFIX; and &cv-SWIGINCSUFFIX;
 to the beginning and end
 of each directory in &cv-SWIGPATH;.
 </para>
@@ -164,7 +165,7 @@ of each directory in &cv-SWIGPATH;.
 <summary>
 <para>
 The prefix used to specify an include directory on the SWIG command line.
-This will be appended to the beginning of each directory
+This will be prepended to the beginning of each directory
 in the &cv-SWIGPATH; construction variable
 when the &cv-_SWIGINCFLAGS; variable is automatically generated.
 </para>
@@ -238,7 +239,7 @@ through the automatically-generated
 &cv-_SWIGINCFLAGS;
 construction variable,
 which is constructed by
-appending the values of the
+respectively prepending and appending the values of the
 &cv-SWIGINCPREFIX; and &cv-SWIGINCSUFFIX;
 construction variables
 to the beginning and end
diff --git a/src/engine/SCons/Tool/tar.py b/src/engine/SCons/Tool/tar.py
index 77392ae..ac4f7f7 100644
--- a/src/engine/SCons/Tool/tar.py
+++ b/src/engine/SCons/Tool/tar.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/tar.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/tar.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Action
 import SCons.Builder
diff --git a/src/engine/SCons/Tool/tar.xml b/src/engine/SCons/Tool/tar.xml
index 637b7db..95e8418 100644
--- a/src/engine/SCons/Tool/tar.xml
+++ b/src/engine/SCons/Tool/tar.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/tex.py b/src/engine/SCons/Tool/tex.py
index 990c9fa..2fecd1d 100644
--- a/src/engine/SCons/Tool/tex.py
+++ b/src/engine/SCons/Tool/tex.py
@@ -10,7 +10,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -33,7 +33,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/tex.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/tex.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import re
@@ -74,15 +74,15 @@ openout_bcf_re = re.compile(r"OUTPUT *(.*\.bcf)")
 #printglossary_re = re.compile(r"^[^%]*\\printglossary", re.MULTILINE)
 
 # search to find rerun warnings
-warning_rerun_str = '(^LaTeX Warning:.*Rerun)|(^Package \w+ Warning:.*Rerun)'
+warning_rerun_str = r'(^LaTeX Warning:.*Rerun)|(^Package \w+ Warning:.*Rerun)'
 warning_rerun_re = re.compile(warning_rerun_str, re.MULTILINE)
 
 # search to find citation rerun warnings
-rerun_citations_str = "^LaTeX Warning:.*\n.*Rerun to get citations correct"
+rerun_citations_str = r"^LaTeX Warning:.*\n.*Rerun to get citations correct"
 rerun_citations_re = re.compile(rerun_citations_str, re.MULTILINE)
 
 # search to find undefined references or citations warnings
-undefined_references_str = '(^LaTeX Warning:.*undefined references)|(^Package \w+ Warning:.*undefined citations)'
+undefined_references_str = r'(^LaTeX Warning:.*undefined references)|(^Package \w+ Warning:.*undefined citations)'
 undefined_references_re = re.compile(undefined_references_str, re.MULTILINE)
 
 # used by the emitter
@@ -297,7 +297,8 @@ def InternalLaTeXAuxAction(XXXLaTeXAction, target = None, source= None, env=None
         logfilename = targetbase + '.log'
         logContent = ''
         if os.path.isfile(logfilename):
-            logContent = open(logfilename, "r").read()
+            with open(logfilename, "r") as f:
+                logContent = f.read()
 
 
         # Read the fls file to find all .aux files
@@ -305,7 +306,8 @@ def InternalLaTeXAuxAction(XXXLaTeXAction, target = None, source= None, env=None
         flsContent = ''
         auxfiles = []
         if os.path.isfile(flsfilename):
-            flsContent = open(flsfilename, "r").read()
+            with open(flsfilename, "r") as f:
+                flsContent = f.read()
             auxfiles = openout_aux_re.findall(flsContent)
             # remove duplicates
             dups = {}
@@ -315,7 +317,8 @@ def InternalLaTeXAuxAction(XXXLaTeXAction, target = None, source= None, env=None
 
         bcffiles = []
         if os.path.isfile(flsfilename):
-            flsContent = open(flsfilename, "r").read()
+            with open(flsfilename, "r") as f:
+                flsContent = f.read()
             bcffiles = openout_bcf_re.findall(flsContent)
             # remove duplicates
             dups = {}
@@ -338,7 +341,8 @@ def InternalLaTeXAuxAction(XXXLaTeXAction, target = None, source= None, env=None
                 already_bibtexed.append(auxfilename)
                 target_aux = os.path.join(targetdir, auxfilename)
                 if os.path.isfile(target_aux):
-                    content = open(target_aux, "r").read()
+                    with open(target_aux, "r") as f:
+                        content = f.read()
                     if content.find("bibdata") != -1:
                         if Verbose:
                             print("Need to run bibtex on ",auxfilename)
@@ -361,7 +365,8 @@ def InternalLaTeXAuxAction(XXXLaTeXAction, target = None, source= None, env=None
                 already_bibtexed.append(bcffilename)
                 target_bcf = os.path.join(targetdir, bcffilename)
                 if os.path.isfile(target_bcf):
-                    content = open(target_bcf, "r").read()
+                    with open(target_bcf, "r") as f:
+                        content = f.read()
                     if content.find("bibdata") != -1:
                         if Verbose:
                             print("Need to run biber on ",bcffilename)
@@ -647,7 +652,7 @@ def ScanFiles(theFile, target, paths, file_tests, file_tests_search, env, graphi
     if incResult:
         aux_files.append(os.path.join(targetdir, incResult.group(1)))
     if Verbose:
-        print("\include file names : ", aux_files)
+        print(r"\include file names : ", aux_files)
     # recursively call this on each of the included files
     inc_files = [ ]
     inc_files.extend( include_re.findall(content) )
@@ -790,7 +795,7 @@ def tex_emitter_core(target, source, env, graphics_extensions):
                 for multibibmatch in multibib_re.finditer(content):
                     if Verbose:
                         print("multibib match ",multibibmatch.group(1))
-                    if multibibmatch != None:
+                    if multibibmatch is not None:
                         baselist = multibibmatch.group(1).split(',')
                         if Verbose:
                             print("multibib list ", baselist)
@@ -813,7 +818,8 @@ def tex_emitter_core(target, source, env, graphics_extensions):
     # read fls file to get all other files that latex creates and will read on the next pass
     # remove files from list that we explicitly dealt with above
     if os.path.isfile(flsfilename):
-        content = open(flsfilename, "r").read()
+        with open(flsfilename, "r") as f:
+            content = f.read()
         out_files = openout_re.findall(content)
         myfiles = [auxfilename, logfilename, flsfilename, targetbase+'.dvi',targetbase+'.pdf']
         for filename in out_files[:]:
diff --git a/src/engine/SCons/Tool/tex.xml b/src/engine/SCons/Tool/tex.xml
index 87741c0..c293977 100644
--- a/src/engine/SCons/Tool/tex.xml
+++ b/src/engine/SCons/Tool/tex.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/textfile.py b/src/engine/SCons/Tool/textfile.py
index 7303e06..bbbde9f 100644
--- a/src/engine/SCons/Tool/textfile.py
+++ b/src/engine/SCons/Tool/textfile.py
@@ -1,6 +1,6 @@
 # -*- python -*-
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -44,7 +44,7 @@ Textfile/Substfile builder for SCons.
     is unpredictable whether the expansion will occur.
 """
 
-__revision__ = "src/engine/SCons/Tool/textfile.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/textfile.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons
 
diff --git a/src/engine/SCons/Tool/textfile.xml b/src/engine/SCons/Tool/textfile.xml
index bca7232..31d2d4f 100644
--- a/src/engine/SCons/Tool/textfile.xml
+++ b/src/engine/SCons/Tool/textfile.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
@@ -147,7 +147,7 @@ and the result replaces the key.
 </para>
 
 <example_commands>
-env = Environment(tools = ['default', 'textfile'])
+env = Environment(tools=['default'])
 
 env['prefix'] = '/usr/bin'
 script_dict = {'@prefix@': '/bin', '@exec_prefix@': '$prefix'}
@@ -174,7 +174,7 @@ env.Substfile('bar.in', SUBST_DICT = good_bar)
 
 # the SUBST_DICT may be in common (and not an override)
 substutions = {}
-subst = Environment(tools = ['textfile'], SUBST_DICT = substitutions)
+subst = Environment(tools=['textfile'], SUBST_DICT=substitutions)
 substitutions['@foo@'] = 'foo'
 subst['SUBST_DICT']['@bar@'] = 'bar'
 subst.Substfile('pgm1.c', [Value('#include "@foo@.h"'),
diff --git a/src/engine/SCons/Tool/tlib.py b/src/engine/SCons/Tool/tlib.py
index c0a755e..e1483a2 100644
--- a/src/engine/SCons/Tool/tlib.py
+++ b/src/engine/SCons/Tool/tlib.py
@@ -5,7 +5,7 @@ XXX
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ XXX
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/tlib.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/tlib.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Tool
 import SCons.Tool.bcc32
diff --git a/src/engine/SCons/Tool/tlib.xml b/src/engine/SCons/Tool/tlib.xml
index cb15db3..2fd8c08 100644
--- a/src/engine/SCons/Tool/tlib.xml
+++ b/src/engine/SCons/Tool/tlib.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/wix.py b/src/engine/SCons/Tool/wix.py
index 3ddfa84..bba033e 100644
--- a/src/engine/SCons/Tool/wix.py
+++ b/src/engine/SCons/Tool/wix.py
@@ -8,7 +8,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/wix.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/wix.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.Builder
 import SCons.Action
diff --git a/src/engine/SCons/Tool/wixTests.py b/src/engine/SCons/Tool/wixTests.py
index 965ca57..c1812a2 100644
--- a/src/engine/SCons/Tool/wixTests.py
+++ b/src/engine/SCons/Tool/wixTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/wixTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/wixTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import unittest
 import os.path
@@ -33,7 +33,6 @@ from SCons.Tool.wix import *
 from SCons.Environment import Environment
 
 import TestCmd
-import TestUnit
 
 
 # create fake candle and light, so the tool's exists() method will succeed
@@ -53,8 +52,7 @@ class WixTestCase(unittest.TestCase):
         assert env.subst('$WIXSRCSUF') == '.wxs'
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(WixTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Tool/xgettext.py b/src/engine/SCons/Tool/xgettext.py
index 2e2934b..3f11357 100644
--- a/src/engine/SCons/Tool/xgettext.py
+++ b/src/engine/SCons/Tool/xgettext.py
@@ -3,7 +3,7 @@
 Tool specific initialization of `xgettext` tool.
 """
 
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -24,7 +24,7 @@ Tool specific initialization of `xgettext` tool.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Tool/xgettext.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/xgettext.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 #############################################################################
@@ -288,9 +288,21 @@ def _POTUpdateBuilder(env, **kw):
 #############################################################################
 def generate(env, **kw):
     """ Generate `xgettext` tool """
+    import sys
+    import os
     import SCons.Util
+    import SCons.Tool
     from SCons.Tool.GettextCommon import RPaths, _detect_xgettext
-
+    from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+    from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+
+    if sys.platform == 'win32':
+        xgettext = SCons.Tool.find_program_path(env, 'xgettext', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+        if xgettext:
+            xgettext_bin_dir = os.path.dirname(xgettext)
+            env.AppendENVPath('PATH', xgettext_bin_dir)
+        else:
+            SCons.Warnings.Warning('xgettext tool requested, but binary not found in ENV PATH')
     try:
         env['XGETTEXT'] = _detect_xgettext(env)
     except:
diff --git a/src/engine/SCons/Tool/xgettext.xml b/src/engine/SCons/Tool/xgettext.xml
index 0b68c14..079693f 100644
--- a/src/engine/SCons/Tool/xgettext.xml
+++ b/src/engine/SCons/Tool/xgettext.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/yacc.py b/src/engine/SCons/Tool/yacc.py
index 4f9fbc2..d397de1 100644
--- a/src/engine/SCons/Tool/yacc.py
+++ b/src/engine/SCons/Tool/yacc.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,13 +31,17 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/yacc.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/yacc.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
+import sys
 
 import SCons.Defaults
 import SCons.Tool
 import SCons.Util
+from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
 
 YaccAction = SCons.Action.Action("$YACCCOM", "$YACCCOMSTR")
 
@@ -94,6 +98,28 @@ def ymEmitter(target, source, env):
 def yyEmitter(target, source, env):
     return _yaccEmitter(target, source, env, ['.yy'], '$YACCHXXFILESUFFIX')
 
+def get_yacc_path(env, append_paths=False):
+    """
+    Find the a path containing the lex or flex binaries. If a construction 
+    environment is passed in then append the path to the ENV PATH.
+    """
+    # save existing path to reset if we don't want to append any paths
+    envPath = env['ENV']['PATH']
+    bins = ['bison', 'yacc', 'win_bison']
+
+    for prog in bins:
+        bin_path = SCons.Tool.find_program_path(
+            env, 
+            prog, 
+            default_paths=CHOCO_DEFAULT_PATH + MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+        if bin_path:
+            if not append_paths:
+                env['ENV']['PATH'] = envPath
+            else:
+                env.AppendENVPath('PATH', os.path.dirname(bin_path))
+            return bin_path
+    SCons.Warnings.Warning('lex tool requested, but lex or flex binary not found in ENV PATH')
+
 def generate(env):
     """Add Builders and construction variables for yacc to an Environment."""
     c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
@@ -113,7 +139,20 @@ def generate(env):
     cxx_file.add_action('.yy', YaccAction)
     cxx_file.add_emitter('.yy', yyEmitter)
 
-    env['YACC']      = env.Detect('bison') or 'yacc'
+    if sys.platform == 'win32':
+        bison = SCons.Tool.find_program_path(env, 'bison', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+        if bison:
+            bison_bin_dir = os.path.dirname(bison)
+            env.AppendENVPath('PATH', bison_bin_dir)
+        else:
+            SCons.Warnings.Warning('yacc tool requested, but bison binary not found in ENV PATH')
+
+    if sys.platform == 'win32':
+        get_yacc_path(env, append_paths=True)
+        env["YACC"] = env.Detect(['bison', 'yacc', 'win_bison'])
+    else:
+        env["YACC"] = env.Detect(["bison", "yacc"])
+    
     env['YACCFLAGS'] = SCons.Util.CLVar('')
     env['YACCCOM']   = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
     env['YACCHFILESUFFIX'] = '.h'
diff --git a/src/engine/SCons/Tool/yacc.xml b/src/engine/SCons/Tool/yacc.xml
index 6bdbd53..8ba3658 100644
--- a/src/engine/SCons/Tool/yacc.xml
+++ b/src/engine/SCons/Tool/yacc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Tool/zip.py b/src/engine/SCons/Tool/zip.py
index 0f6a8dd..55792c2 100644
--- a/src/engine/SCons/Tool/zip.py
+++ b/src/engine/SCons/Tool/zip.py
@@ -9,7 +9,7 @@ selection method.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/zip.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Tool/zip.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 
diff --git a/src/engine/SCons/Tool/zip.xml b/src/engine/SCons/Tool/zip.xml
index 82eb61a..d7622dd 100644
--- a/src/engine/SCons/Tool/zip.xml
+++ b/src/engine/SCons/Tool/zip.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright (c) 2001 - 2017 The SCons Foundation
+Copyright (c) 2001 - 2019 The SCons Foundation
 
 This file is processed by the bin/SConsDoc.py module.
 See its __doc__ string for a discussion of the format.
diff --git a/src/engine/SCons/Util.py b/src/engine/SCons/Util.py
index 2a1604b..f2498e9 100644
--- a/src/engine/SCons/Util.py
+++ b/src/engine/SCons/Util.py
@@ -3,7 +3,7 @@
 Various utility functions go here.
 """
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -24,7 +24,7 @@ Various utility functions go here.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Util.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Util.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import sys
@@ -37,21 +37,18 @@ import pprint
 PY3 = sys.version_info[0] == 3
 
 try:
+    from collections import UserDict, UserList, UserString
+except ImportError:
     from UserDict import UserDict
-except ImportError as e:
-    from collections import UserDict
-
-try:
     from UserList import UserList
-except ImportError as e:
-    from collections import UserList
-
-from collections import Iterable
+    from UserString import UserString
 
 try:
-    from UserString import UserString
-except ImportError as e:
-    from collections import UserString
+    from collections.abc import Iterable, MappingView
+except ImportError:
+    from collections import Iterable
+
+from collections import OrderedDict
 
 # Don't "from types import ..." these because we need to get at the
 # types module later to look for UnicodeType.
@@ -63,7 +60,7 @@ MethodType      = types.MethodType
 FunctionType    = types.FunctionType
 
 try:
-    unicode
+    _ = type(unicode)
 except NameError:
     UnicodeType = str
 else:
@@ -106,7 +103,7 @@ def containsOnly(str, set):
     return 1
 
 def splitext(path):
-    "Same as os.path.splitext() but faster."
+    """Same as os.path.splitext() but faster."""
     sep = rightmost_separator(path, os.sep)
     dot = path.rfind('.')
     # An ext is only real if it has at least one non-digit char
@@ -371,7 +368,13 @@ def print_tree(root, child_func, prune=0, showtags=0, margin=[0], visited=None):
 
 DictTypes = (dict, UserDict)
 ListTypes = (list, UserList)
-SequenceTypes = (list, tuple, UserList)
+
+try:
+    # Handle getting dictionary views.
+    SequenceTypes = (list, tuple, UserList, MappingView)
+except NameError:
+    SequenceTypes = (list, tuple, UserList)
+
 
 # Note that profiling data shows a speed-up when comparing
 # explicitly with str and unicode instead of simply comparing
@@ -481,10 +484,7 @@ def to_String_for_subst(s,
     if isinstance(s, BaseStringTypes):
         return s
     elif isinstance(s, SequenceTypes):
-        l = []
-        for e in s:
-            l.append(to_String_for_subst(e))
-        return ' '.join( s )
+        return ' '.join([to_String_for_subst(e) for e in s])
     elif isinstance(s, UserString):
         # s.data can only be either a unicode or a regular
         # string. Please see the UserString initializer.
@@ -1032,64 +1032,9 @@ class CLVar(UserList):
         return UserList.__add__(self, CLVar(other))
     def __radd__(self, other):
         return UserList.__radd__(self, CLVar(other))
-    def __coerce__(self, other):
-        return (self, CLVar(other))
     def __str__(self):
         return ' '.join(self.data)
 
-# A dictionary that preserves the order in which items are added.
-# Submitted by David Benjamin to ActiveState's Python Cookbook web site:
-#     http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/107747
-# Including fixes/enhancements from the follow-on discussions.
-class OrderedDict(UserDict):
-    def __init__(self, dict = None):
-        self._keys = []
-        UserDict.__init__(self, dict)
-
-    def __delitem__(self, key):
-        UserDict.__delitem__(self, key)
-        self._keys.remove(key)
-
-    def __setitem__(self, key, item):
-        UserDict.__setitem__(self, key, item)
-        if key not in self._keys: self._keys.append(key)
-
-    def clear(self):
-        UserDict.clear(self)
-        self._keys = []
-
-    def copy(self):
-        dict = OrderedDict()
-        dict.update(self)
-        return dict
-
-    def items(self):
-        return list(zip(self._keys, list(self.values())))
-
-    def keys(self):
-        return self._keys[:]
-
-    def popitem(self):
-        try:
-            key = self._keys[-1]
-        except IndexError:
-            raise KeyError('dictionary is empty')
-
-        val = self[key]
-        del self[key]
-
-        return (key, val)
-
-    def setdefault(self, key, failobj = None):
-        UserDict.setdefault(self, key, failobj)
-        if key not in self._keys: self._keys.append(key)
-
-    def update(self, dict):
-        for (key, val) in dict.items():
-            self.__setitem__(key, val)
-
-    def values(self):
-        return list(map(self.get, self._keys))
 
 class Selector(OrderedDict):
     """A callable ordered dictionary that maps file suffixes to
@@ -1431,8 +1376,8 @@ def make_path_relative(path):
 # The original idea for AddMethod() and RenameFunction() come from the
 # following post to the ActiveState Python Cookbook:
 #
-#	ASPN: Python Cookbook : Install bound methods in an instance
-#	http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/223613
+#   ASPN: Python Cookbook : Install bound methods in an instance
+#   http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/223613
 #
 # That code was a little fragile, though, so the following changes
 # have been wrung on it:
@@ -1449,8 +1394,8 @@ def make_path_relative(path):
 #   the "new" module, as alluded to in Alex Martelli's response to the
 #   following Cookbook post:
 #
-#	ASPN: Python Cookbook : Dynamically added methods to a class
-#	http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/81732
+#   ASPN: Python Cookbook : Dynamically added methods to a class
+#   http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/81732
 
 def AddMethod(obj, function, name=None):
     """
@@ -1520,6 +1465,11 @@ else:
         md5 = True
 
         def MD5signature(s):
+            """
+            Generate a String of Hex digits representing the md5 signature of the string
+            :param s: either string or bytes. Normally should be bytes
+            :return: String of hex digits
+            """
             m = hashlib.md5()
 
             try:
@@ -1530,6 +1480,11 @@ else:
             return m.hexdigest()
 
         def MD5filesignature(fname, chunksize=65536):
+            """
+            :param fname:
+            :param chunksize:
+            :return: String of Hex digits
+            """
             m = hashlib.md5()
             f = open(fname, "rb")
             while True:
@@ -1540,6 +1495,7 @@ else:
             f.close()
             return m.hexdigest()
 
+
 def MD5collect(signatures):
     """
     Collects a list of signatures into an aggregate signature.
@@ -1612,16 +1568,66 @@ class NullSeq(Null):
 
 del __revision__
 
-def to_bytes (s):
+
+def to_bytes(s):
+    if s is None:
+        return b'None'
+    if not PY3 and isinstance(s, UnicodeType):
+        # PY2, must encode unicode
+        return bytearray(s, 'utf-8')
     if isinstance (s, (bytes, bytearray)) or bytes is str:
+        # Above case not covered here as py2 bytes and strings are the same
         return s
-    return bytes (s, 'utf-8')
+    return bytes(s, 'utf-8')
+
 
-def to_str (s):
+def to_str(s):
+    if s is None:
+        return 'None'
     if bytes is str or is_String(s):
         return s
     return str (s, 'utf-8')
 
+
+def cmp(a, b):
+    """
+    Define cmp because it's no longer available in python3
+    Works under python 2 as well
+    """
+    return (a > b) - (a < b)
+
+
+def get_env_bool(env, name, default=False):
+    """Get a value of env[name] converted to boolean. The value of env[name] is
+    interpreted as follows: 'true', 'yes', 'y', 'on' (case insensitive) and
+    anything convertible to int that yields non-zero integer are True values;
+    '0', 'false', 'no', 'n' and 'off' (case insensitive) are False values. For
+    all other cases, default value is returned.
+
+    :Parameters:
+        - `env`     - dict or dict-like object, a convainer with variables
+        - `name`    - name of the variable in env to be returned
+        - `default` - returned when env[name] does not exist or can't be converted to bool
+    """
+    try:
+        var = env[name]
+    except KeyError:
+        return default
+    try:
+        return bool(int(var))
+    except ValueError:
+        if str(var).lower() in ('true', 'yes', 'y', 'on'):
+            return True
+        elif str(var).lower() in ('false', 'no', 'n', 'off'):
+            return False
+        else:
+            return default
+
+
+def get_os_env_bool(name, default=False):
+    """Same as get_env_bool(os.environ, name, default)."""
+    return get_env_bool(os.environ, name, default)
+
 # Local Variables:
 # tab-width:4
 # indent-tabs-mode:nil
diff --git a/src/engine/SCons/UtilTests.py b/src/engine/SCons/UtilTests.py
index 1df4069..c33a1fe 100644
--- a/src/engine/SCons/UtilTests.py
+++ b/src/engine/SCons/UtilTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/UtilTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/UtilTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import SCons.compat
 
@@ -32,15 +32,18 @@ import unittest
 from collections import UserDict, UserList, UserString
 
 import TestCmd
-import TestUnit
 
 import SCons.Errors
 
 from SCons.Util import *
 
-try: eval('unicode')
-except NameError: HasUnicode = False
-else:             HasUnicode = True
+try:
+    eval('unicode')
+except NameError:
+    HasUnicode = False
+else:
+    HasUnicode = True
+
 
 class OutBuffer(object):
     def __init__(self):
@@ -49,47 +52,59 @@ class OutBuffer(object):
     def write(self, str):
         self.buffer = self.buffer + str
 
+
 class dictifyTestCase(unittest.TestCase):
     def test_dictify(self):
         """Test the dictify() function"""
         r = SCons.Util.dictify(['a', 'b', 'c'], [1, 2, 3])
-        assert r == {'a':1, 'b':2, 'c':3}, r
+        assert r == {'a': 1, 'b': 2, 'c': 3}, r
 
         r = {}
         SCons.Util.dictify(['a'], [1], r)
         SCons.Util.dictify(['b'], [2], r)
         SCons.Util.dictify(['c'], [3], r)
-        assert r == {'a':1, 'b':2, 'c':3}, r
+        assert r == {'a': 1, 'b': 2, 'c': 3}, r
+
 
 class UtilTestCase(unittest.TestCase):
     def test_splitext(self):
-        assert splitext('foo') == ('foo','')
-        assert splitext('foo.bar') == ('foo','.bar')
-        assert splitext(os.path.join('foo.bar', 'blat')) == (os.path.join('foo.bar', 'blat'),'')
+        assert splitext('foo') == ('foo', '')
+        assert splitext('foo.bar') == ('foo', '.bar')
+        assert splitext(os.path.join('foo.bar', 'blat')) == (os.path.join('foo.bar', 'blat'), '')
 
     class Node(object):
         def __init__(self, name, children=[]):
             self.children = children
             self.name = name
             self.nocache = None
+
         def __str__(self):
             return self.name
+
         def exists(self):
             return 1
+
         def rexists(self):
             return 1
+
         def has_builder(self):
             return 1
+
         def has_explicit_builder(self):
             return 1
+
         def side_effect(self):
             return 1
+
         def precious(self):
             return 1
+
         def always_build(self):
             return 1
+
         def is_up_to_date(self):
             return 1
+
         def noclean(self):
             return 1
 
@@ -116,7 +131,7 @@ class UtilTestCase(unittest.TestCase):
 """
 
         lines = expect.split('\n')[:-1]
-        lines = ['[E BSPACN ]'+l for l in lines]
+        lines = ['[E BSPACN ]' + l for l in lines]
         withtags = '\n'.join(lines) + '\n'
 
         return foo, expect, withtags
@@ -151,13 +166,14 @@ class UtilTestCase(unittest.TestCase):
 """
 
         lines = expect.split('\n')[:-1]
-        lines = ['[E BSPACN ]'+l for l in lines]
+        lines = ['[E BSPACN ]' + l for l in lines]
         withtags = '\n'.join(lines) + '\n'
 
         return blat_o, expect, withtags
 
     def test_render_tree(self):
         """Test the render_tree() function"""
+
         def get_children(node):
             return node.children
 
@@ -178,6 +194,7 @@ class UtilTestCase(unittest.TestCase):
 
     def test_print_tree(self):
         """Test the print_tree() function"""
+
         def get_children(node):
             return node.children
 
@@ -244,7 +261,7 @@ class UtilTestCase(unittest.TestCase):
         assert is_Dict(UserDict())
 
         # os.environ is not a dictionary in python 3
-        if sys.version_info < (3,0):
+        if sys.version_info < (3, 0):
             assert is_Dict(os.environ)
 
         try:
@@ -307,37 +324,49 @@ class UtilTestCase(unittest.TestCase):
         if HasUnicode:
             exec("assert not is_Tuple(u'')")
 
+    def test_to_Bytes(self):
+        """ Test the to_Bytes method"""
+        if not PY3:
+            self.assertEqual(to_bytes(UnicodeType('Hello')),
+                             bytearray(u'Hello', 'utf-8'),
+                             "Check that to_bytes creates byte array when presented with unicode string. PY2 only")
+
     def test_to_String(self):
         """Test the to_String() method."""
         assert to_String(1) == "1", to_String(1)
-        assert to_String([ 1, 2, 3]) == str([1, 2, 3]), to_String([1,2,3])
+        assert to_String([1, 2, 3]) == str([1, 2, 3]), to_String([1, 2, 3])
         assert to_String("foo") == "foo", to_String("foo")
+        assert to_String(None) == 'None'
+        # test low level string converters too
+        assert to_str(None) == 'None'
+        assert to_bytes(None) == b'None'
 
-        s1=UserString('blah')
+        s1 = UserString('blah')
         assert to_String(s1) == s1, s1
         assert to_String(s1) == 'blah', s1
 
         class Derived(UserString):
             pass
+
         s2 = Derived('foo')
         assert to_String(s2) == s2, s2
         assert to_String(s2) == 'foo', s2
 
         if HasUnicode:
-            s3=UserString(unicode('bar'))
+            s3 = UserString(unicode('bar'))
             assert to_String(s3) == s3, s3
             assert to_String(s3) == unicode('bar'), s3
             assert isinstance(to_String(s3), unicode), \
-                   type(to_String(s3))
+                type(to_String(s3))
 
         if HasUnicode:
             s4 = unicode('baz')
             assert to_String(s4) == unicode('baz'), to_String(s4)
             assert isinstance(to_String(s4), unicode), \
-                   type(to_String(s4))
+                type(to_String(s4))
 
     def test_WhereIs(self):
-        test = TestCmd.TestCmd(workdir = '')
+        test = TestCmd.TestCmd(workdir='')
 
         sub1_xxx_exe = test.workpath('sub1', 'xxx.exe')
         sub2_xxx_exe = test.workpath('sub2', 'xxx.exe')
@@ -360,17 +389,17 @@ class UtilTestCase(unittest.TestCase):
         env_path = os.environ['PATH']
 
         try:
-            pathdirs_1234 = [ test.workpath('sub1'),
-                              test.workpath('sub2'),
-                              test.workpath('sub3'),
-                              test.workpath('sub4'),
-                            ] + env_path.split(os.pathsep)
-
-            pathdirs_1243 = [ test.workpath('sub1'),
-                              test.workpath('sub2'),
-                              test.workpath('sub4'),
-                              test.workpath('sub3'),
-                            ] + env_path.split(os.pathsep)
+            pathdirs_1234 = [test.workpath('sub1'),
+                             test.workpath('sub2'),
+                             test.workpath('sub3'),
+                             test.workpath('sub4'),
+                             ] + env_path.split(os.pathsep)
+
+            pathdirs_1243 = [test.workpath('sub1'),
+                             test.workpath('sub2'),
+                             test.workpath('sub4'),
+                             test.workpath('sub3'),
+                             ] + env_path.split(os.pathsep)
 
             os.environ['PATH'] = os.pathsep.join(pathdirs_1234)
             wi = WhereIs('xxx.exe')
@@ -380,9 +409,9 @@ class UtilTestCase(unittest.TestCase):
             wi = WhereIs('xxx.exe', os.pathsep.join(pathdirs_1243))
             assert wi == test.workpath(sub4_xxx_exe), wi
 
-            wi = WhereIs('xxx.exe',reject = sub3_xxx_exe)
+            wi = WhereIs('xxx.exe', reject=sub3_xxx_exe)
             assert wi == test.workpath(sub4_xxx_exe), wi
-            wi = WhereIs('xxx.exe', pathdirs_1243, reject = sub3_xxx_exe)
+            wi = WhereIs('xxx.exe', pathdirs_1243, reject=sub3_xxx_exe)
             assert wi == test.workpath(sub4_xxx_exe), wi
 
             os.environ['PATH'] = os.pathsep.join(pathdirs_1243)
@@ -394,19 +423,19 @@ class UtilTestCase(unittest.TestCase):
             assert wi == test.workpath(sub3_xxx_exe), wi
 
             if sys.platform == 'win32':
-                wi = WhereIs('xxx', pathext = '')
+                wi = WhereIs('xxx', pathext='')
                 assert wi is None, wi
 
-                wi = WhereIs('xxx', pathext = '.exe')
+                wi = WhereIs('xxx', pathext='.exe')
                 assert wi == test.workpath(sub4_xxx_exe), wi
 
-                wi = WhereIs('xxx', path = pathdirs_1234, pathext = '.BAT;.EXE')
+                wi = WhereIs('xxx', path=pathdirs_1234, pathext='.BAT;.EXE')
                 assert wi.lower() == test.workpath(sub3_xxx_exe).lower(), wi
 
                 # Test that we return a normalized path even when
                 # the path contains forward slashes.
                 forward_slash = test.workpath('') + '/sub3'
-                wi = WhereIs('xxx', path = forward_slash, pathext = '.EXE')
+                wi = WhereIs('xxx', path=forward_slash, pathext='.EXE')
                 assert wi.lower() == test.workpath(sub3_xxx_exe).lower(), wi
 
             del os.environ['PATH']
@@ -426,24 +455,27 @@ class UtilTestCase(unittest.TestCase):
         assert get_environment_var("$BAR ") == None, get_environment_var("$BAR ")
         assert get_environment_var("FOO$BAR") == None, get_environment_var("FOO$BAR")
         assert get_environment_var("$FOO[0]") == None, get_environment_var("$FOO[0]")
-        assert get_environment_var("${some('complex expression')}") == None, get_environment_var("${some('complex expression')}")
+        assert get_environment_var("${some('complex expression')}") == None, get_environment_var(
+            "${some('complex expression')}")
 
     def test_Proxy(self):
         """Test generic Proxy class."""
+
         class Subject(object):
             def foo(self):
                 return 1
+
             def bar(self):
                 return 2
 
-        s=Subject()
+        s = Subject()
         s.baz = 3
 
         class ProxyTest(Proxy):
             def bar(self):
                 return 4
 
-        p=ProxyTest(s)
+        p = ProxyTest(s)
 
         assert p.foo() == 1, p.foo()
         assert p.bar() == 4, p.bar()
@@ -477,8 +509,10 @@ class UtilTestCase(unittest.TestCase):
         filename = tempfile.mktemp()
         str = '1234567890 ' + filename
         try:
-            open(filename, 'w').write(str)
-            assert open(get_native_path(filename)).read() == str
+            with open(filename, 'w') as f:
+                f.write(str)
+            with open(get_native_path(filename)) as f:
+                assert f.read() == str
         finally:
             try:
                 os.unlink(filename)
@@ -490,49 +524,49 @@ class UtilTestCase(unittest.TestCase):
         p1 = r'C:\dir\num\one;C:\dir\num\two'
         p2 = r'C:\mydir\num\one;C:\mydir\num\two'
         # have to include the pathsep here so that the test will work on UNIX too.
-        p1 = PrependPath(p1,r'C:\dir\num\two',sep = ';')
-        p1 = PrependPath(p1,r'C:\dir\num\three',sep = ';')
-        p2 = PrependPath(p2,r'C:\mydir\num\three',sep = ';')
-        p2 = PrependPath(p2,r'C:\mydir\num\one',sep = ';')
-        assert(p1 == r'C:\dir\num\three;C:\dir\num\two;C:\dir\num\one')
-        assert(p2 == r'C:\mydir\num\one;C:\mydir\num\three;C:\mydir\num\two')
+        p1 = PrependPath(p1, r'C:\dir\num\two', sep=';')
+        p1 = PrependPath(p1, r'C:\dir\num\three', sep=';')
+        p2 = PrependPath(p2, r'C:\mydir\num\three', sep=';')
+        p2 = PrependPath(p2, r'C:\mydir\num\one', sep=';')
+        assert (p1 == r'C:\dir\num\three;C:\dir\num\two;C:\dir\num\one')
+        assert (p2 == r'C:\mydir\num\one;C:\mydir\num\three;C:\mydir\num\two')
 
     def test_AppendPath(self):
         """Test appending to a path."""
         p1 = r'C:\dir\num\one;C:\dir\num\two'
         p2 = r'C:\mydir\num\one;C:\mydir\num\two'
         # have to include the pathsep here so that the test will work on UNIX too.
-        p1 = AppendPath(p1,r'C:\dir\num\two',sep = ';')
-        p1 = AppendPath(p1,r'C:\dir\num\three',sep = ';')
-        p2 = AppendPath(p2,r'C:\mydir\num\three',sep = ';')
-        p2 = AppendPath(p2,r'C:\mydir\num\one',sep = ';')
-        assert(p1 == r'C:\dir\num\one;C:\dir\num\two;C:\dir\num\three')
-        assert(p2 == r'C:\mydir\num\two;C:\mydir\num\three;C:\mydir\num\one')
+        p1 = AppendPath(p1, r'C:\dir\num\two', sep=';')
+        p1 = AppendPath(p1, r'C:\dir\num\three', sep=';')
+        p2 = AppendPath(p2, r'C:\mydir\num\three', sep=';')
+        p2 = AppendPath(p2, r'C:\mydir\num\one', sep=';')
+        assert (p1 == r'C:\dir\num\one;C:\dir\num\two;C:\dir\num\three')
+        assert (p2 == r'C:\mydir\num\two;C:\mydir\num\three;C:\mydir\num\one')
 
     def test_PrependPathPreserveOld(self):
         """Test prepending to a path while preserving old paths"""
         p1 = r'C:\dir\num\one;C:\dir\num\two'
         # have to include the pathsep here so that the test will work on UNIX too.
-        p1 = PrependPath(p1,r'C:\dir\num\two',sep = ';', delete_existing=0)
-        p1 = PrependPath(p1,r'C:\dir\num\three',sep = ';')
-        assert(p1 == r'C:\dir\num\three;C:\dir\num\one;C:\dir\num\two')
+        p1 = PrependPath(p1, r'C:\dir\num\two', sep=';', delete_existing=0)
+        p1 = PrependPath(p1, r'C:\dir\num\three', sep=';')
+        assert (p1 == r'C:\dir\num\three;C:\dir\num\one;C:\dir\num\two')
 
     def test_AppendPathPreserveOld(self):
         """Test appending to a path while preserving old paths"""
         p1 = r'C:\dir\num\one;C:\dir\num\two'
         # have to include the pathsep here so that the test will work on UNIX too.
-        p1 = AppendPath(p1,r'C:\dir\num\one',sep = ';', delete_existing=0)
-        p1 = AppendPath(p1,r'C:\dir\num\three',sep = ';')
-        assert(p1 == r'C:\dir\num\one;C:\dir\num\two;C:\dir\num\three')
+        p1 = AppendPath(p1, r'C:\dir\num\one', sep=';', delete_existing=0)
+        p1 = AppendPath(p1, r'C:\dir\num\three', sep=';')
+        assert (p1 == r'C:\dir\num\one;C:\dir\num\two;C:\dir\num\three')
 
     def test_addPathIfNotExists(self):
         """Test the AddPathIfNotExists() function"""
-        env_dict = { 'FOO' : os.path.normpath('/foo/bar') + os.pathsep + \
-                     os.path.normpath('/baz/blat'),
-                     'BAR' : os.path.normpath('/foo/bar') + os.pathsep + \
-                     os.path.normpath('/baz/blat'),
-                     'BLAT' : [ os.path.normpath('/foo/bar'),
-                                os.path.normpath('/baz/blat') ] }
+        env_dict = {'FOO': os.path.normpath('/foo/bar') + os.pathsep + \
+                           os.path.normpath('/baz/blat'),
+                    'BAR': os.path.normpath('/foo/bar') + os.pathsep + \
+                           os.path.normpath('/baz/blat'),
+                    'BLAT': [os.path.normpath('/foo/bar'),
+                             os.path.normpath('/baz/blat')]}
         AddPathIfNotExists(env_dict, 'FOO', os.path.normpath('/foo/bar'))
         AddPathIfNotExists(env_dict, 'BAR', os.path.normpath('/bar/foo'))
         AddPathIfNotExists(env_dict, 'BAZ', os.path.normpath('/foo/baz'))
@@ -545,9 +579,9 @@ class UtilTestCase(unittest.TestCase):
                os.path.normpath('/foo/bar') + os.pathsep + \
                os.path.normpath('/baz/blat'), env_dict['BAR']
         assert env_dict['BAZ'] == os.path.normpath('/foo/baz'), env_dict['BAZ']
-        assert env_dict['BLAT'] == [ os.path.normpath('/baz/foo'),
-                                     os.path.normpath('/foo/bar'),
-                                     os.path.normpath('/baz/blat') ], env_dict['BLAT' ]
+        assert env_dict['BLAT'] == [os.path.normpath('/baz/foo'),
+                                    os.path.normpath('/foo/bar'),
+                                    os.path.normpath('/baz/blat')], env_dict['BLAT']
 
     def test_CLVar(self):
         """Test the command-line construction variable class"""
@@ -656,10 +690,11 @@ class UtilTestCase(unittest.TestCase):
 
             def __str__(self):
                 return self.name
+
             def get_suffix(self):
                 return os.path.splitext(self.name)[1]
 
-        s = Selector({'a' : 'AAA', 'b' : 'BBB'})
+        s = Selector({'a': 'AAA', 'b': 'BBB'})
         assert s['a'] == 'AAA', s['a']
         assert s['b'] == 'BBB', s['b']
         exc_caught = None
@@ -679,7 +714,7 @@ class UtilTestCase(unittest.TestCase):
 
         env = DummyEnv()
 
-        s = Selector({'.d' : 'DDD', '.e' : 'EEE'})
+        s = Selector({'.d': 'DDD', '.e': 'EEE'})
         ret = s(env, [])
         assert ret is None, ret
         ret = s(env, [MyNode('foo.d')])
@@ -692,9 +727,9 @@ class UtilTestCase(unittest.TestCase):
         ret = s(env, [MyNode('bar.x')])
         assert ret == 'XXX', ret
 
-        env = DummyEnv({'FSUFF' : '.f', 'GSUFF' : '.g'})
+        env = DummyEnv({'FSUFF': '.f', 'GSUFF': '.g'})
 
-        s = Selector({'$FSUFF' : 'FFF', '$GSUFF' : 'GGG'})
+        s = Selector({'$FSUFF': 'FFF', '$GSUFF': 'GGG'})
         ret = s(env, [MyNode('foo.f')])
         assert ret == 'FFF', ret
         ret = s(env, [MyNode('bar.g')])
@@ -780,9 +815,11 @@ class MD5TestCase(unittest.TestCase):
         s = MD5signature('222')
         assert 'bcbe3365e6ac95ea2c0343a2395834dd' == s, s
 
+
 class NodeListTestCase(unittest.TestCase):
     def test_simple_attributes(self):
         """Test simple attributes of a NodeList class"""
+
         class TestClass(object):
             def __init__(self, name, child=None):
                 self.child = child
@@ -793,18 +830,21 @@ class NodeListTestCase(unittest.TestCase):
         t3 = TestClass('t3')
 
         nl = NodeList([t1, t2, t3])
-        assert nl.bar == [ 't1', 't2', 't3' ], nl.bar
-        assert nl[0:2].child.bar == [ 't1child', 't2child' ], \
-               nl[0:2].child.bar
+        assert nl.bar == ['t1', 't2', 't3'], nl.bar
+        assert nl[0:2].child.bar == ['t1child', 't2child'], \
+            nl[0:2].child.bar
 
     def test_callable_attributes(self):
         """Test callable attributes of a NodeList class"""
+
         class TestClass(object):
             def __init__(self, name, child=None):
                 self.child = child
                 self.bar = name
+
             def foo(self):
                 return self.bar + "foo"
+
             def getself(self):
                 return self
 
@@ -813,13 +853,13 @@ class NodeListTestCase(unittest.TestCase):
         t3 = TestClass('t3')
 
         nl = NodeList([t1, t2, t3])
-        assert nl.foo() == [ 't1foo', 't2foo', 't3foo' ], nl.foo()
-        assert nl.bar == [ 't1', 't2', 't3' ], nl.bar
-        assert nl.getself().bar == [ 't1', 't2', 't3' ], nl.getself().bar
-        assert nl[0:2].child.foo() == [ 't1childfoo', 't2childfoo' ], \
-               nl[0:2].child.foo()
-        assert nl[0:2].child.bar == [ 't1child', 't2child' ], \
-               nl[0:2].child.bar
+        assert nl.foo() == ['t1foo', 't2foo', 't3foo'], nl.foo()
+        assert nl.bar == ['t1', 't2', 't3'], nl.bar
+        assert nl.getself().bar == ['t1', 't2', 't3'], nl.getself().bar
+        assert nl[0:2].child.foo() == ['t1childfoo', 't2childfoo'], \
+            nl[0:2].child.foo()
+        assert nl[0:2].child.bar == ['t1child', 't2child'], \
+            nl[0:2].child.bar
 
     def test_null(self):
         """Test a null NodeList"""
@@ -835,21 +875,112 @@ class flattenTestCase(unittest.TestCase):
     def test_scalar(self):
         """Test flattening a scalar"""
         result = flatten('xyz')
-        assert result == ['xyz'], result
+        self.assertEqual(result,['xyz'], result)
+
+    def test_dictionary_values(self):
+        """Test flattening the dictionary values"""
+        items = {"a": 1, "b": 2, "c": 3}
+        result = flatten(items.values())
+        self.assertEqual(sorted(result),[1,2,3])
+
+
+class OsEnviron(object):
+    """Used to temporarily mock os.environ"""
+    def __init__(self, environ):
+        self._environ = environ
+
+    def start(self):
+        self._stored = os.environ
+        os.environ = self._environ
+
+    def stop(self):
+        os.environ = self._stored
+        del self._stored
+
+    def __enter__(self):
+        self.start()
+        return os.environ
+
+    def __exit__(self, *args):
+        self.stop()
+
+
+class get_env_boolTestCase(unittest.TestCase):
+    def test_missing(self):
+        env = dict()
+        var = get_env_bool(env, 'FOO')
+        assert var is False, "var should be False, not %s" % repr(var)
+        env = {'FOO': '1'}
+        var = get_env_bool(env, 'BAR')
+        assert var is False, "var should be False, not %s" % repr(var)
+
+    def test_true(self):
+        for foo in [ 'TRUE', 'True', 'true',
+                     'YES', 'Yes', 'yes',
+                     'Y', 'y',
+                     'ON', 'On', 'on',
+                     '1', '20', '-1']:
+            env = {'FOO': foo}
+            var = get_env_bool(env, 'FOO')
+            assert var is True, 'var should be True, not %s' % repr(var)
+
+    def test_false(self):
+        for foo in [ 'FALSE', 'False', 'false',
+                     'NO', 'No', 'no',
+                     'N', 'n',
+                     'OFF', 'Off', 'off',
+                     '0']:
+            env = {'FOO': foo}
+            var = get_env_bool(env, 'FOO', True)
+            assert var is False, 'var should be True, not %s' % repr(var)
+
+    def test_default(self):
+        env = {'FOO': 'other'}
+        var = get_env_bool(env, 'FOO', True)
+        assert var is True, 'var should be True, not %s' % repr(var)
+        var = get_env_bool(env, 'FOO', False)
+        assert var is False, 'var should be False, not %s' % repr(var)
+
+
+class get_os_env_boolTestCase(unittest.TestCase):
+    def test_missing(self):
+        with OsEnviron(dict()):
+            var = get_os_env_bool('FOO')
+            assert var is False, "var should be False, not %s" % repr(var)
+        with OsEnviron({'FOO': '1'}):
+            var = get_os_env_bool('BAR')
+            assert var is False, "var should be False, not %s" % repr(var)
+
+    def test_true(self):
+        for foo in [ 'TRUE', 'True', 'true',
+                     'YES', 'Yes', 'yes',
+                     'Y', 'y',
+                     'ON', 'On', 'on',
+                     '1', '20', '-1']:
+            with OsEnviron({'FOO': foo}):
+                var = get_os_env_bool('FOO')
+                assert var is True, 'var should be True, not %s' % repr(var)
+
+    def test_false(self):
+        for foo in [ 'FALSE', 'False', 'false',
+                     'NO', 'No', 'no',
+                     'N', 'n',
+                     'OFF', 'Off', 'off',
+                     '0']:
+            with OsEnviron({'FOO': foo}):
+                var = get_os_env_bool('FOO', True)
+                assert var is False, 'var should be True, not %s' % repr(var)
+
+    def test_default(self):
+        with OsEnviron({'FOO': 'other'}):
+            var = get_os_env_bool('FOO', True)
+            assert var is True, 'var should be True, not %s' % repr(var)
+            var = get_os_env_bool('FOO', False)
+            assert var is False, 'var should be False, not %s' % repr(var)
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [ dictifyTestCase,
-                 flattenTestCase,
-                 MD5TestCase,
-                 NodeListTestCase,
-                 UtilTestCase,
-               ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Variables/BoolVariable.py b/src/engine/SCons/Variables/BoolVariable.py
index 881a6b4..5af3a5f 100644
--- a/src/engine/SCons/Variables/BoolVariable.py
+++ b/src/engine/SCons/Variables/BoolVariable.py
@@ -12,7 +12,7 @@ Usage example::
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -34,7 +34,7 @@ Usage example::
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/BoolVariable.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/BoolVariable.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __all__ = ['BoolVariable',]
 
diff --git a/src/engine/SCons/Variables/BoolVariableTests.py b/src/engine/SCons/Variables/BoolVariableTests.py
index 42beaee..62519bc 100644
--- a/src/engine/SCons/Variables/BoolVariableTests.py
+++ b/src/engine/SCons/Variables/BoolVariableTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/BoolVariableTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/BoolVariableTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Variables
 
@@ -118,8 +116,7 @@ class BoolVariableTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(BoolVariableTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Variables/EnumVariable.py b/src/engine/SCons/Variables/EnumVariable.py
index b6fc382..1a5f40c 100644
--- a/src/engine/SCons/Variables/EnumVariable.py
+++ b/src/engine/SCons/Variables/EnumVariable.py
@@ -15,7 +15,7 @@ Usage example::
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -37,7 +37,7 @@ Usage example::
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/EnumVariable.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/EnumVariable.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __all__ = ['EnumVariable',]
 
diff --git a/src/engine/SCons/Variables/EnumVariableTests.py b/src/engine/SCons/Variables/EnumVariableTests.py
index caef48f..d6e4761 100644
--- a/src/engine/SCons/Variables/EnumVariableTests.py
+++ b/src/engine/SCons/Variables/EnumVariableTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/EnumVariableTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/EnumVariableTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Variables
 
@@ -195,8 +193,7 @@ class EnumVariableTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(EnumVariableTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Variables/ListVariable.py b/src/engine/SCons/Variables/ListVariable.py
index 8f9a9a8..d0f99f5 100644
--- a/src/engine/SCons/Variables/ListVariable.py
+++ b/src/engine/SCons/Variables/ListVariable.py
@@ -25,7 +25,7 @@ Usage example::
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -46,7 +46,7 @@ Usage example::
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Variables/ListVariable.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/ListVariable.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 # Known Bug: This should behave like a Set-Type, but does not really,
 # since elements can occur twice.
diff --git a/src/engine/SCons/Variables/ListVariableTests.py b/src/engine/SCons/Variables/ListVariableTests.py
index be45aed..ff933d0 100644
--- a/src/engine/SCons/Variables/ListVariableTests.py
+++ b/src/engine/SCons/Variables/ListVariableTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,14 +21,12 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/ListVariableTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/ListVariableTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import copy
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Errors
 import SCons.Variables
 
@@ -125,8 +123,7 @@ class ListVariableTestCase(unittest.TestCase):
         n = l.__class__(copy.copy(l))
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(ListVariableTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Variables/PackageVariable.py b/src/engine/SCons/Variables/PackageVariable.py
index 8e229b7..e2b3394 100644
--- a/src/engine/SCons/Variables/PackageVariable.py
+++ b/src/engine/SCons/Variables/PackageVariable.py
@@ -28,7 +28,7 @@ Usage example:
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -50,7 +50,7 @@ Usage example:
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/PackageVariable.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/PackageVariable.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __all__ = ['PackageVariable',]
 
diff --git a/src/engine/SCons/Variables/PackageVariableTests.py b/src/engine/SCons/Variables/PackageVariableTests.py
index 30a88b5..636e2c1 100644
--- a/src/engine/SCons/Variables/PackageVariableTests.py
+++ b/src/engine/SCons/Variables/PackageVariableTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/PackageVariableTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/PackageVariableTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
@@ -30,8 +30,6 @@ import SCons.Errors
 import SCons.Variables
 
 import TestCmd
-import TestUnit
-
 
 class PackageVariableTestCase(unittest.TestCase):
     def test_PackageVariable(self):
@@ -115,8 +113,7 @@ class PackageVariableTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(PackageVariableTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Variables/PathVariable.py b/src/engine/SCons/Variables/PathVariable.py
index dc5fcd2..52df0af 100644
--- a/src/engine/SCons/Variables/PathVariable.py
+++ b/src/engine/SCons/Variables/PathVariable.py
@@ -45,7 +45,7 @@ Usage example::
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -67,7 +67,7 @@ Usage example::
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/PathVariable.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/PathVariable.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __all__ = ['PathVariable',]
 
diff --git a/src/engine/SCons/Variables/PathVariableTests.py b/src/engine/SCons/Variables/PathVariableTests.py
index c8518af..1cd35f6 100644
--- a/src/engine/SCons/Variables/PathVariableTests.py
+++ b/src/engine/SCons/Variables/PathVariableTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/PathVariableTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/PathVariableTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import sys
@@ -31,8 +31,6 @@ import SCons.Errors
 import SCons.Variables
 
 import TestCmd
-import TestUnit
-
 
 class PathVariableTestCase(unittest.TestCase):
     def test_PathVariable(self):
@@ -228,8 +226,7 @@ class PathVariableTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(PathVariableTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Variables/VariablesTests.py b/src/engine/SCons/Variables/VariablesTests.py
index dc507ce..7712bb4 100644
--- a/src/engine/SCons/Variables/VariablesTests.py
+++ b/src/engine/SCons/Variables/VariablesTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,17 +21,17 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Variables/VariablesTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/VariablesTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
 import TestSCons
-import TestUnit
 
 import SCons.Variables
 import SCons.Subst
 import SCons.Warnings
+from SCons.Util import cmp
 
 
 class Environment(object):
@@ -49,12 +49,6 @@ class Environment(object):
         return key in self.dict
 
 
-def cmp(a, b):
-    """
-    Define cmp because it's no longer available in python3
-    Works under python 2 as well
-    """
-    return (a > b) - (a < b)
 
 
 def check(key, value, env):
@@ -65,7 +59,9 @@ def check(key, value, env):
 def checkSave(file, expected):
     gdict = {}
     ldict = {}
-    exec(open(file, 'r').read(), gdict, ldict)
+    with open(file, 'r') as f:
+        exec(f.read(), gdict, ldict)
+
     assert expected == ldict, "%s\n...not equal to...\n%s" % (expected, ldict)
 
 class VariablesTestCase(unittest.TestCase):
@@ -492,9 +488,29 @@ B: b - alpha test
     default: 42
     actual: 54
 """
+
+        expectBackwards = """
+B: b - alpha test
+    default: 42
+    actual: 54
+
+ANSWER: THE answer to THE question
+    default: 42
+    actual: 54
+
+A: a - alpha test
+    default: 42
+    actual: 54
+"""
         text = opts.GenerateHelpText(env, sort=cmp)
         assert text == expectAlpha, text
 
+        textBool = opts.GenerateHelpText(env, sort=True)
+        assert text == expectAlpha, text
+
+        textBackwards = opts.GenerateHelpText(env, sort=lambda x, y: cmp(y, x))
+        assert textBackwards == expectBackwards, "Expected:\n%s\nGot:\n%s\n"%(textBackwards, expectBackwards) 
+
     def test_FormatVariableHelpText(self):
         """Test generating custom format help text"""
         opts = SCons.Variables.Variables()
@@ -675,13 +691,7 @@ class UnknownVariablesTestCase(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    suite = unittest.TestSuite()
-    tclasses = [ VariablesTestCase,
-                 UnknownVariablesTestCase ]
-    for tclass in tclasses:
-        names = unittest.getTestCaseNames(tclass, 'test_')
-        suite.addTests(list(map(tclass, names)))
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/Variables/__init__.py b/src/engine/SCons/Variables/__init__.py
index 784f795..bde5b88 100644
--- a/src/engine/SCons/Variables/__init__.py
+++ b/src/engine/SCons/Variables/__init__.py
@@ -5,7 +5,7 @@ customizable variables to an SCons build.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,10 +26,11 @@ customizable variables to an SCons build.
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__revision__ = "src/engine/SCons/Variables/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Variables/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os.path
 import sys
+from functools import cmp_to_key
 
 import SCons.Environment
 import SCons.Errors
@@ -287,9 +288,13 @@ class Variables(object):
 
         env - an environment that is used to get the current values
               of the options.
+        cmp - Either a function as follows: The specific sort function should take two arguments and return -1, 0 or 1 
+              or a boolean to indicate if it should be sorted.
         """
 
-        if sort:
+        if callable(sort):
+            options = sorted(self.options, key=cmp_to_key(lambda x,y: sort(x.key,y.key)))
+        elif sort is True:
             options = sorted(self.options, key=lambda x: x.key)
         else:
             options = self.options
diff --git a/src/engine/SCons/Warnings.py b/src/engine/SCons/Warnings.py
index 33ba050..4c6031a 100644
--- a/src/engine/SCons/Warnings.py
+++ b/src/engine/SCons/Warnings.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ This file implements the warnings framework for SCons.
 
 """
 
-__revision__ = "src/engine/SCons/Warnings.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/Warnings.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 
@@ -74,12 +74,6 @@ class MisleadingKeywordsWarning(WarningOnByDefault):
 class MissingSConscriptWarning(WarningOnByDefault):
     pass
 
-class NoMD5ModuleWarning(WarningOnByDefault):
-    pass
-
-class NoMetaclassSupportWarning(WarningOnByDefault):
-    pass
-
 class NoObjectCountWarning(WarningOnByDefault):
     pass
 
@@ -153,6 +147,9 @@ class DeprecatedSigModuleWarning(MandatoryDeprecatedWarning):
 class DeprecatedBuilderKeywordsWarning(MandatoryDeprecatedWarning):
     pass
 
+class DeprecatedMissingSConscriptWarning(DeprecatedWarning):
+    pass
+
 
 # The below is a list of 2-tuples.  The first element is a class object.
 # The second element is true if that class is enabled, false if it is disabled.
@@ -185,8 +182,8 @@ def warn(clazz, *args):
     global _enabled, _warningAsException, _warningOut
 
     warning = clazz(args)
-    for clazz, flag in _enabled:
-        if isinstance(warning, clazz):
+    for cls, flag in _enabled:
+        if isinstance(warning, cls):
             if flag:
                 if _warningAsException:
                     raise warning
diff --git a/src/engine/SCons/WarningsTests.py b/src/engine/SCons/WarningsTests.py
index fbba547..5257050 100644
--- a/src/engine/SCons/WarningsTests.py
+++ b/src/engine/SCons/WarningsTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,13 +21,11 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/WarningsTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/WarningsTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import sys
 import unittest
 
-import TestUnit
-
 import SCons.Warnings
 
 class TestOutput(object):
@@ -127,8 +125,7 @@ class WarningsTestCase(unittest.TestCase):
         assert to.out == "Foo", to.out
 
 if __name__ == "__main__":
-    suite = unittest.makeSuite(WarningsTestCase, 'test_')
-    TestUnit.run(suite)
+    unittest.main()
 
 # Local Variables:
 # tab-width:4
diff --git a/src/engine/SCons/__init__.py b/src/engine/SCons/__init__.py
index 5a22146..6b22009 100644
--- a/src/engine/SCons/__init__.py
+++ b/src/engine/SCons/__init__.py
@@ -5,7 +5,7 @@ The main package for the SCons software construction utility.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,15 +27,15 @@ The main package for the SCons software construction utility.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
-__version__ = "3.0.0"
+__version__ = "3.0.5"
 
-__build__ = "rel_3.0.0:4395:8972f6a2f699"
+__build__ = "103260fce95bf5db1c35fb2371983087d85dd611"
 
-__buildsys__ = "ubuntu-16"
+__buildsys__ = "Williams-MBP-2"
 
-__date__ = "2017/09/18 12:59:24"
+__date__ = "2019-07-13 18:25:30"
 
 __developer__ = "bdbaddog"
 
diff --git a/src/engine/SCons/compat/__init__.py b/src/engine/SCons/compat/__init__.py
index 7973732..1e744e4 100644
--- a/src/engine/SCons/compat/__init__.py
+++ b/src/engine/SCons/compat/__init__.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -57,7 +57,7 @@ function defined below loads the module as the "real" name (without the
 rest of our code will find our pre-loaded compatibility module.
 """
 
-__revision__ = "src/engine/SCons/compat/__init__.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/compat/__init__.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import sys
@@ -98,7 +98,7 @@ import pickle
 
 # Was pickle.HIGHEST_PROTOCOL
 # Changed to 2 so py3.5+'s pickle will be compatible with py2.7.
-PICKLE_PROTOCOL = 2
+PICKLE_PROTOCOL = pickle.HIGHEST_PROTOCOL
 
 # TODO: FIXME
 # In 3.x, 'profile' automatically loads the fast version if available.
diff --git a/src/engine/SCons/compat/_scons_dbm.py b/src/engine/SCons/compat/_scons_dbm.py
index 7adbeb9..31d6803 100644
--- a/src/engine/SCons/compat/_scons_dbm.py
+++ b/src/engine/SCons/compat/_scons_dbm.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -30,7 +30,7 @@ that the whichdb.whichdb() implementstation in the various 2.X versions of
 Python won't blow up even if dbm wasn't compiled in.
 """
 
-__revision__ = "src/engine/SCons/compat/_scons_dbm.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/compat/_scons_dbm.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 class error(Exception):
     pass
diff --git a/src/engine/SCons/cpp.py b/src/engine/SCons/cpp.py
index ff750c2..e500711 100644
--- a/src/engine/SCons/cpp.py
+++ b/src/engine/SCons/cpp.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/cpp.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/cpp.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 __doc__ = """
 SCons C Pre-Processor module
@@ -43,15 +43,18 @@ import re
 # that we want to fetch, using the regular expressions to which the lists
 # of preprocessor directives map.
 cpp_lines_dict = {
-    # Fetch the rest of a #if/#elif/#ifdef/#ifndef as one argument,
+    # Fetch the rest of a #if/#elif as one argument,
+    # with white space optional.
+    ('if', 'elif')      : r'\s*(.+)',
+
+    # Fetch the rest of a #ifdef/#ifndef as one argument,
     # separated from the keyword by white space.
-    ('if', 'elif', 'ifdef', 'ifndef',)
-                        : '\s+(.+)',
+    ('ifdef', 'ifndef',): r'\s+(.+)',
 
     # Fetch the rest of a #import/#include/#include_next line as one
     # argument, with white space optional.
     ('import', 'include', 'include_next',)
-                        : '\s*(.+)',
+                        : r'\s*(.+)',
 
     # We don't care what comes after a #else or #endif line.
     ('else', 'endif',)  : '',
@@ -61,10 +64,10 @@ cpp_lines_dict = {
     #   2) The optional parentheses and arguments (if it's a function-like
     #      macro, '' if it's not).
     #   3) The expansion value.
-    ('define',)         : '\s+([_A-Za-z][_A-Za-z0-9_]*)(\([^)]*\))?\s*(.*)',
+    ('define',)         : r'\s+([_A-Za-z][_A-Za-z0-9_]*)(\([^)]*\))?\s*(.*)',
 
     # Fetch the #undefed keyword from a #undef line.
-    ('undef',)          : '\s+([_A-Za-z][A-Za-z0-9_]*)',
+    ('undef',)          : r'\s+([_A-Za-z][A-Za-z0-9_]*)',
 }
 
 # Create a table that maps each individual C preprocessor directive to
@@ -82,9 +85,9 @@ del op_list
 # Create a list of the expressions we'll use to match all of the
 # preprocessor directives.  These are the same as the directives
 # themselves *except* that we must use a negative lookahead assertion
-# when matching "if" so it doesn't match the "if" in "ifdef."
+# when matching "if" so it doesn't match the "if" in "ifdef" or "ifndef".
 override = {
-    'if'                        : 'if(?!def)',
+    'if'                        : 'if(?!n?def)',
 }
 l = [override.get(x, x) for x in list(Table.keys())]
 
@@ -94,7 +97,7 @@ l = [override.get(x, x) for x in list(Table.keys())]
 # a list of tuples, one for each preprocessor line.  The preprocessor
 # directive will be the first element in each tuple, and the rest of
 # the line will be the second element.
-e = '^\s*#\s*(' + '|'.join(l) + ')(.*)$'
+e = r'^\s*#\s*(' + '|'.join(l) + ')(.*)$'
 
 # And last but not least, compile the expression.
 CPP_Expression = re.compile(e, re.M)
@@ -141,12 +144,12 @@ CPP_to_Python_Ops_Expression = re.compile(expr)
 # A separate list of expressions to be evaluated and substituted
 # sequentially, not all at once.
 CPP_to_Python_Eval_List = [
-    ['defined\s+(\w+)',         '"\\1" in __dict__'],
-    ['defined\s*\((\w+)\)',     '"\\1" in __dict__'],
-    ['/\*.*\*/',                ''],
-    ['/\*.*',                   ''],
-    ['//.*',                    ''],
-    ['(0x[0-9A-Fa-f]*)[UL]+',   '\\1'],
+    [r'defined\s+(\w+)',         '"\\1" in __dict__'],
+    [r'defined\s*\((\w+)\)',     '"\\1" in __dict__'],
+    [r'/\*.*\*/',                ''],
+    [r'/\*.*',                   ''],
+    [r'//.*',                    ''],
+    [r'(0x[0-9A-Fa-f]*)[UL]+',   '\\1'],
 ]
 
 # Replace the string representations of the regular expressions in the
@@ -222,11 +225,11 @@ line_continuations = re.compile('\\\\\r?\n')
 # Search for a "function call" macro on an expansion.  Returns the
 # two-tuple of the "function" name itself, and a string containing the
 # arguments within the call parentheses.
-function_name = re.compile('(\S+)\(([^)]*)\)')
+function_name = re.compile(r'(\S+)\(([^)]*)\)')
 
 # Split a string containing comma-separated function call arguments into
 # the separate arguments.
-function_arg_separator = re.compile(',\s*')
+function_arg_separator = re.compile(r',\s*')
 
 
 
diff --git a/src/engine/SCons/cppTests.py b/src/engine/SCons/cppTests.py
index 2108277..7ebdf99 100644
--- a/src/engine/SCons/cppTests.py
+++ b/src/engine/SCons/cppTests.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,7 +23,7 @@
 
 from __future__ import absolute_import
 
-__revision__ = "src/engine/SCons/cppTests.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/cppTests.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import atexit
 import sys
@@ -346,6 +346,80 @@ nested_ifs_input = """
 
 
 
+ifndef_input = """
+#define DEFINED 0
+
+#ifndef	DEFINED
+#include "file45-no"
+#else
+#include "file45-yes"
+#endif
+
+#ifndef	NOT_DEFINED
+#include <file46-yes>
+#else
+#include <file46-no>
+#endif
+"""
+
+
+if_defined_no_space_input = """
+#define DEFINED 0
+
+#if(defined DEFINED)
+#include "file47-yes"
+#endif
+
+#if(!defined DEFINED)
+#include <file48-no>
+#elif(!defined DEFINED)
+#include <file49-no>
+#else
+#include <file50-yes>
+#endif
+
+#if!(defined DEFINED)
+#include "file51-no"
+#elif!(defined DEFINED)
+#include <file52-no>
+#else
+#include "file53-yes"
+#endif
+"""
+
+if_no_space_input = """
+#define DEFINED 0
+
+#if(DEFINED)
+#include "file54-no"
+#endif
+
+#if!(DEFINED)
+#include <file55-yes>
+#elif!(DEFINED)
+#include <file56-no>
+#endif
+
+#if(DEFINED)
+#include "file57-no"
+#elif(!DEFINED)
+#include <file58-yes>
+#endif
+
+#if!( DEFINED)
+#include "file59-yes"
+#elif!( DEFINED)
+#include <file60-no>
+#endif
+
+#if( DEFINED)
+#include "file61-no"
+#elif(! DEFINED)
+#include <file62-yes>
+#endif
+"""
+
+
 #    pp_class = PreProcessor
 #    #pp_class = DumbPreProcessor
 
@@ -426,6 +500,25 @@ class cppTestCase(unittest.TestCase):
         result = self.cpp.process_contents(nested_ifs_input)
         assert expect == result, (expect, result)
 
+    def test_ifndef(self):
+        """Test basic #ifndef processing"""
+        expect = self.ifndef_expect
+        result = self.cpp.process_contents(ifndef_input)
+        assert expect == result, (expect, result)
+
+    def test_if_defined_no_space(self):
+        """Test #if(defined, i.e.without space but parenthesis"""
+        expect = self.if_defined_no_space_expect
+        result = self.cpp.process_contents(if_defined_no_space_input)
+        assert expect == result, (expect, result)
+
+    def test_if_no_space(self):
+        """Test #if(, i.e. without space but parenthesis"""
+        expect = self.if_no_space_expect
+        result = self.cpp.process_contents(if_no_space_input)
+        assert expect == result, (expect, result)
+
+
 class cppAllTestCase(cppTestCase):
     def setUp(self):
         self.cpp = self.cpp_class(current = ".",
@@ -513,6 +606,24 @@ class PreProcessorTestCase(cppAllTestCase):
         ('include', '"', 'file7-yes'),
     ]
 
+    ifndef_expect = [
+        ('include', '"', 'file45-yes'),
+        ('include', '<', 'file46-yes'),
+    ]
+
+    if_defined_no_space_expect = [
+        ('include', '"', 'file47-yes'),
+        ('include', '<', 'file50-yes'),
+        ('include', '"', 'file53-yes'),
+    ]
+
+    if_no_space_expect = [
+        ('include', '<', 'file55-yes'),
+        ('include', '<', 'file58-yes'),
+        ('include', '"', 'file59-yes'),
+        ('include', '<', 'file62-yes'),
+    ]
+
 class DumbPreProcessorTestCase(cppAllTestCase):
     cpp_class = cpp.DumbPreProcessor
 
@@ -625,7 +736,34 @@ class DumbPreProcessorTestCase(cppAllTestCase):
         ('include', '"', 'file7-yes')
     ]
 
+    ifndef_expect = [
+        ('include', '"', 'file45-no'),
+        ('include', '"', 'file45-yes'),
+        ('include', '<', 'file46-yes'),
+        ('include', '<', 'file46-no'),
+    ]
+
+    if_defined_no_space_expect = [
+        ('include', '"', 'file47-yes'),
+        ('include', '<', 'file48-no'),
+        ('include', '<', 'file49-no'),
+        ('include', '<', 'file50-yes'),
+        ('include', '"', 'file51-no'),
+        ('include', '<', 'file52-no'),
+        ('include', '"', 'file53-yes'),
+    ]
 
+    if_no_space_expect = [
+        ('include', '"', 'file54-no'),
+        ('include', '<', 'file55-yes'),
+        ('include', '<', 'file56-no'),
+        ('include', '"', 'file57-no'),
+        ('include', '<', 'file58-yes'),
+        ('include', '"', 'file59-yes'),
+        ('include', '<', 'file60-no'),
+        ('include', '"', 'file61-no'),
+        ('include', '<', 'file62-yes'),
+    ]
 
 import os
 import re
@@ -679,7 +817,8 @@ class fileTestCase(unittest.TestCase):
         return '\n'.join(map(strip_spaces, lines))
 
     def write(self, file, contents):
-        open(file, 'w').write(self.strip_initial_spaces(contents))
+        with open(file, 'w') as f:
+            f.write(self.strip_initial_spaces(contents))
 
     def test_basic(self):
         """Test basic file inclusion"""
diff --git a/src/engine/SCons/dblite.py b/src/engine/SCons/dblite.py
index 87a1763..14bd93d 100644
--- a/src/engine/SCons/dblite.py
+++ b/src/engine/SCons/dblite.py
@@ -75,7 +75,8 @@ class dblite(object):
 
     def __init__(self, file_base_name, flag, mode):
         assert flag in (None, "r", "w", "c", "n")
-        if (flag is None): flag = "r"
+        if flag is None:
+            flag = "r"
 
         base, ext = os.path.splitext(file_base_name)
         if ext == dblite_suffix:
@@ -106,17 +107,20 @@ class dblite(object):
             self._chown_to = -1  # don't chown
             self._chgrp_to = -1  # don't chgrp
 
-        if (self._flag == "n"):
-            self._open(self._file_name, "wb", self._mode)
+        if self._flag == "n":
+            with self._open(self._file_name, "wb", self._mode):
+                pass  # just make sure it exists
         else:
             try:
                 f = self._open(self._file_name, "rb")
             except IOError as e:
-                if (self._flag != "c"):
+                if self._flag != "c":
                     raise e
-                self._open(self._file_name, "wb", self._mode)
+                with self._open(self._file_name, "wb", self._mode):
+                    pass  # just make sure it exists
             else:
                 p = f.read()
+                f.close()
                 if len(p) > 0:
                     try:
                         if bytes is not str:
@@ -132,7 +136,7 @@ class dblite(object):
                             corruption_warning(self._file_name)
 
     def close(self):
-        if (self._needs_sync):
+        if self._needs_sync:
             self.sync()
 
     def __del__(self):
diff --git a/src/engine/SCons/exitfuncs.py b/src/engine/SCons/exitfuncs.py
index 2b7bd51..3f4c1ac 100644
--- a/src/engine/SCons/exitfuncs.py
+++ b/src/engine/SCons/exitfuncs.py
@@ -5,7 +5,7 @@ Register functions which are executed when SCons exits for any reason.
 """
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -27,7 +27,7 @@ Register functions which are executed when SCons exits for any reason.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/exitfuncs.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/engine/SCons/exitfuncs.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 
 import atexit
diff --git a/src/script/scons-configure-cache.py b/src/script/scons-configure-cache.py
index 9b8b737..7c5d3b6 100644
--- a/src/script/scons-configure-cache.py
+++ b/src/script/scons-configure-cache.py
@@ -2,7 +2,7 @@
 #
 # SCons - a Software Constructor
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,102 +23,139 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+'''Show or convert the configuration of an SCons cache directory.
+
+A cache of derived files is stored by file signature.
+The files are split into directories named by the first few
+digits of the signature. The prefix length used for directory
+names can be changed by this script.
+'''
+
 from __future__ import print_function
+import argparse
+import glob
+import json
+import os
 
-__revision__ = "src/script/scons-configure-cache.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/script/scons-configure-cache.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
-__version__ = "3.0.0"
+__version__ = "3.0.5"
 
-__build__ = "rel_3.0.0:4395:8972f6a2f699"
+__build__ = "103260fce95bf5db1c35fb2371983087d85dd611"
 
-__buildsys__ = "ubuntu-16"
+__buildsys__ = "Williams-MBP-2"
 
-__date__ = "2017/09/18 12:59:24"
+__date__ = "2019-07-13 18:25:30"
 
 __developer__ = "bdbaddog"
 
-import argparse
-import glob
-import json
-import os
 
 def rearrange_cache_entries(current_prefix_len, new_prefix_len):
-    print('Changing prefix length from', current_prefix_len, 'to', new_prefix_len)
+    '''Move cache files if prefix length changed.
+
+    Move the existing cache files to new directories of the
+    appropriate name length and clean up the old directories.
+    '''
+    print('Changing prefix length from', current_prefix_len,
+          'to', new_prefix_len)
     dirs = set()
     old_dirs = set()
     for file in glob.iglob(os.path.join('*', '*')):
         name = os.path.basename(file)
-        dir = name[:current_prefix_len].upper()
-        if dir not in old_dirs:
-            print('Migrating', dir)
-            old_dirs.add(dir)
-        dir = name[:new_prefix_len].upper()
-        if dir not in dirs:
-            os.mkdir(dir)
-            dirs.add(dir)
-        os.rename(file, os.path.join(dir, name))
+        dname = name[:current_prefix_len].upper()
+        if dname not in old_dirs:
+            print('Migrating', dname)
+            old_dirs.add(dname)
+        dname = name[:new_prefix_len].upper()
+        if dname not in dirs:
+            os.mkdir(dname)
+            dirs.add(dname)
+        os.rename(file, os.path.join(dname, name))
 
     # Now delete the original directories
-    for dir in old_dirs:
-        os.rmdir(dir)
+    for dname in old_dirs:
+        os.rmdir(dname)
+
 
-# This dictionary should have one entry per entry in the cache config
-# Each entry should have the following:
+# The configuration dictionary should have one entry per entry in the
+# cache config. The value of each entry should include the following:
 #   implicit - (optional) This is to allow adding a new config entry and also
 #              changing the behaviour of the system at the same time. This
-#              indicates the value the config entry would have had if it had been
-#              specified.
+#              indicates the value the config entry would have had if it had
+#              been specified.
 #   default - The value the config entry should have if it wasn't previously
 #             specified
 #   command-line - parameters to pass to ArgumentParser.add_argument
-#   converter - (optional) Function to call if it's necessary to do some work
+#   converter - (optional) Function to call if conversion is required
 #               if this configuration entry changes
 config_entries = {
-    'prefix_len' : { 
-        'implicit' : 1, 
-        'default' : 2 ,
-        'command-line' : {
-            'help' : 'Length of cache file name used as subdirectory prefix',
-            'metavar' : '<number>',
-            'type' : int
-            },
-        'converter' : rearrange_cache_entries
+    'prefix_len': {
+        'implicit': 1,
+        'default': 2,
+        'command-line': {
+            'help': 'Length of cache file name used as subdirectory prefix',
+            'metavar': '<number>',
+            'type': int
+        },
+        'converter': rearrange_cache_entries
     }
 }
+
 parser = argparse.ArgumentParser(
-    description = 'Modify the configuration of an scons cache directory',
-    epilog = '''
-             Unless you specify an option, it will not be changed (if it is
-             already set in the cache config), or changed to an appropriate
-             default (it it is not set).
-             '''
-    )
+    description='Modify the configuration of an scons cache directory',
+    epilog='''
+           Unspecified options will not be changed unless they are not
+           set at all, in which case they are set to an appropriate default.
+           ''')
 
 parser.add_argument('cache-dir', help='Path to scons cache directory')
 for param in config_entries:
-    parser.add_argument('--' + param.replace('_', '-'), 
+    parser.add_argument('--' + param.replace('_', '-'),
                         **config_entries[param]['command-line'])
-parser.add_argument('--version', action='version', version='%(prog)s 1.0')
+parser.add_argument('--version',
+                    action='version',
+                    version='%(prog)s 1.0')
+parser.add_argument('--show',
+                    action="store_true",
+                    help="show current configuration")
 
 # Get the command line as a dict without any of the unspecified entries.
 args = dict([x for x in vars(parser.parse_args()).items() if x[1]])
 
 # It seems somewhat strange to me, but positional arguments don't get the -
 # in the name changed to _, whereas optional arguments do...
-os.chdir(args['cache-dir'])
+cache = args['cache-dir']
+if not os.path.isdir(cache):
+    raise RuntimeError("There is no cache directory named %s" % cache)
+os.chdir(cache)
 del args['cache-dir']
 
 if not os.path.exists('config'):
+    # old config dirs did not have a 'config' file. Try to update.
     # Validate the only files in the directory are directories 0-9, a-f
-    expected = [ '{:X}'.format(x) for x in range(0, 16) ]
+    expected = ['{:X}'.format(x) for x in range(0, 16)]
     if not set(os.listdir('.')).issubset(expected):
-        raise RuntimeError("This doesn't look like a version 1 cache directory")
+        raise RuntimeError(
+            "%s does not look like a valid version 1 cache directory" % cache)
     config = dict()
 else:
     with open('config') as conf:
         config = json.load(conf)
 
-# Find any keys that aren't currently set but should be
+if args.get('show', None):
+    print("Current configuration in '%s':" % cache)
+    print(json.dumps(config, sort_keys=True,
+                     indent=4, separators=(',', ': ')))
+    # in case of the show argument, emit some stats as well
+    file_count = 0
+    for _, _, files in os.walk('.'):
+        file_count += len(files)
+    if file_count:  # skip config file if it exists
+        file_count -= 1
+    print("Cache contains %s files" % file_count)
+    del args['show']
+
+# Find any keys that are not currently set but should be
 for key in config_entries:
     if key not in config:
         if 'implicit' in config_entries[key]:
@@ -128,10 +165,10 @@ for key in config_entries:
         if key not in args:
             args[key] = config_entries[key]['default']
 
-#Now we go through each entry in args to see if it changes an existing config
-#setting.
+# Now go through each entry in args to see if it changes an existing config
+# setting.
 for key in args:
-    if args[key] != config[key]:        
+    if args[key] != config[key]:
         if 'converter' in config_entries[key]:
             config_entries[key]['converter'](config[key], args[key])
         config[key] = args[key]
diff --git a/src/script/scons-time.py b/src/script/scons-time.py
index 08bde60..b2ae22b 100644
--- a/src/script/scons-time.py
+++ b/src/script/scons-time.py
@@ -9,7 +9,7 @@
 #
 
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -31,7 +31,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 from __future__ import division, print_function
 
-__revision__ = "src/script/scons-time.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/script/scons-time.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import getopt
 import glob
@@ -58,12 +58,12 @@ def make_temp_file(**kw):
     return result
 
 def HACK_for_exec(cmd, *args):
-    '''
+    """
     For some reason, Python won't allow an exec() within a function
     that also declares an internal function (including lambda functions).
     This function is a hack that calls exec() in a function with no
     internal functions.
-    '''
+    """
     if not args:          exec(cmd)
     elif len(args) == 1:  exec(cmd, args[0])
     else:                 exec(cmd, args[0], args[1])
@@ -147,7 +147,7 @@ class Gnuplotter(Plotter):
         return line.plot_string()
 
     def vertical_bar(self, x, type, label, comment):
-        if self.get_min_x() <= x and x <= self.get_max_x():
+        if self.get_min_x() <= x <= self.get_max_x():
             points = [(x, 0), (x, self.max_graph_value(self.get_max_y()))]
             self.line(points, type, label, comment)
 
@@ -814,7 +814,9 @@ class SConsTimer(object):
                 self.title = a
 
         if self.config_file:
-            exec(open(self.config_file, 'r').read(), self.__dict__)
+            with open(self.config_file, 'r') as f:
+                config = f.read()
+            exec(config, self.__dict__)
 
         if self.chdir:
             os.chdir(self.chdir)
@@ -933,7 +935,9 @@ class SConsTimer(object):
                 self.title = a
 
         if self.config_file:
-            HACK_for_exec(open(self.config_file, 'r').read(), self.__dict__)
+            with open(self.config_file, 'r') as f:
+                config = f.read()
+            HACK_for_exec(config, self.__dict__)
 
         if self.chdir:
             os.chdir(self.chdir)
@@ -1053,7 +1057,9 @@ class SConsTimer(object):
         object_name = args.pop(0)
 
         if self.config_file:
-            HACK_for_exec(open(self.config_file, 'r').read(), self.__dict__)
+            with open(self.config_file, 'r') as f:
+                config = f.read()
+            HACK_for_exec(config, self.__dict__)
 
         if self.chdir:
             os.chdir(self.chdir)
@@ -1191,7 +1197,9 @@ class SConsTimer(object):
             sys.exit(1)
 
         if self.config_file:
-            exec(open(self.config_file, 'r').read(), self.__dict__)
+            with open(self.config_file, 'r') as f:
+                config = f.read()
+            exec(config, self.__dict__)
 
         if args:
             self.archive_list = args
diff --git a/src/script/scons.bat b/src/script/scons.bat
index f759e43..156aa9c 100644
--- a/src/script/scons.bat
+++ b/src/script/scons.bat
@@ -1,11 +1,11 @@
-@REM Copyright (c) 2001 - 2017 The SCons Foundation
-@REM src/script/scons.bat rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog
+@REM Copyright (c) 2001 - 2019 The SCons Foundation
+@REM src/script/scons.bat 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog
 @echo off
 set SCONS_ERRORLEVEL=
 if "%OS%" == "Windows_NT" goto WinNT
 
 @REM for 9x/Me you better not have more than 9 args
-python -c "from os.path import join; import sys; sys.path = [ join(sys.prefix, 'Lib', 'site-packages', 'scons-3.0.0'), join(sys.prefix, 'Lib', 'site-packages', 'scons'), join(sys.prefix, 'scons-3.0.0'), join(sys.prefix, 'scons')] + sys.path; import SCons.Script; SCons.Script.main()" %1 %2 %3 %4 %5 %6 %7 %8 %9
+python -c "from os.path import join; import sys; sys.path = [ join(sys.prefix, 'Lib', 'site-packages', 'scons-3.0.5'), join(sys.prefix, 'Lib', 'site-packages', 'scons'), join(sys.prefix, 'scons-3.0.5'), join(sys.prefix, 'scons')] + sys.path; import SCons.Script; SCons.Script.main()" %1 %2 %3 %4 %5 %6 %7 %8 %9
 @REM no way to set exit status of this script for 9x/Me
 goto endscons
 
@@ -16,10 +16,14 @@ goto endscons
 :WinNT
 setlocal
 @REM ensure the script will be executed with the Python it was installed for
-set path=%~dp0;%~dp0..;%path%
+pushd %~dp0..
+set path=%~dp0;%CD%;%path%
+popd
 @REM try the script named as the .bat file in current dir, then in Scripts subdir
 set scriptname=%~dp0%~n0.py
 if not exist "%scriptname%" set scriptname=%~dp0Scripts\%~n0.py
+@REM Handle when running from wheel where the script has no .py extension
+if not exist "%scriptname%" set scriptname=%~dp0%~n0
 python "%scriptname%" %*
 endlocal & set SCONS_ERRORLEVEL=%ERRORLEVEL%
 
diff --git a/src/script/scons.py b/src/script/scons.py
index bee0224..e58d8e2 100644..100755
--- a/src/script/scons.py
+++ b/src/script/scons.py
@@ -2,7 +2,7 @@
 #
 # SCons - a Software Constructor
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -25,22 +25,30 @@
 
 from __future__ import print_function
 
-__revision__ = "src/script/scons.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/script/scons.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
-__version__ = "3.0.0"
+__version__ = "3.0.5"
 
-__build__ = "rel_3.0.0:4395:8972f6a2f699"
+__build__ = "103260fce95bf5db1c35fb2371983087d85dd611"
 
-__buildsys__ = "ubuntu-16"
+__buildsys__ = "Williams-MBP-2"
 
-__date__ = "2017/09/18 12:59:24"
+__date__ = "2019-07-13 18:25:30"
 
 __developer__ = "bdbaddog"
 
+# This is the entry point to the SCons program.
+# The only job of this script is to work out where the guts of the program
+# could be and import them, where the real work begins.
+# SCons can be invoked several different ways
+# - from an installed location
+# - from a "local install" copy
+# - from a source tree, which has a different dir struture than the other two
+# Try to account for all those possibilities.
+
 import os
 import sys
 
-
 ##############################################################################
 # BEGIN STANDARD SCons SCRIPT HEADER
 #
@@ -50,57 +58,53 @@ import sys
 # should also change other scripts that use this same header.
 ##############################################################################
 
-# Strip the script directory from sys.path() so on case-insensitive
-# (WIN32) systems Python doesn't think that the "scons" script is the
-# "SCons" package.  Replace it with our own library directories
-# (version-specific first, in case they installed by hand there,
-# followed by generic) so we pick up the right version of the build
-# engine modules if they're in either directory.
-
-
+# compatibility check
 if (3,0,0) < sys.version_info < (3,5,0) or sys.version_info < (2,7,0):
     msg = "scons: *** SCons version %s does not run under Python version %s.\n\
-Python < 3.5 is not yet supported.\n"
+Python 2.7 or >= 3.5 is required.\n"
     sys.stderr.write(msg % (__version__, sys.version.split()[0]))
     sys.exit(1)
 
-
-script_dir = sys.path[0]
-
-if script_dir in sys.path:
-    sys.path.remove(script_dir)
+# Strip the script directory from sys.path so on case-insensitive
+# (WIN32) systems Python doesn't think that the "scons" script is the
+# "SCons" package.
+script_dir = os.path.dirname(os.path.realpath(__file__))
+script_path = os.path.realpath(os.path.dirname(__file__))
+if script_path in sys.path:
+    sys.path.remove(script_path)
 
 libs = []
 
 if "SCONS_LIB_DIR" in os.environ:
     libs.append(os.environ["SCONS_LIB_DIR"])
 
-# - running from source takes priority (since 2.3.2), excluding SCONS_LIB_DIR settings
-script_path = os.path.abspath(os.path.dirname(__file__))
-source_path = os.path.join(script_path, '..', 'engine')
-libs.append(source_path)
+# running from source takes 2nd priority (since 2.3.2), following SCONS_LIB_DIR
+source_path = os.path.join(script_path, os.pardir, 'engine')
+if os.path.isdir(source_path):
+    libs.append(source_path)
 
+# add local-install locations
 local_version = 'scons-local-' + __version__
 local = 'scons-local'
 if script_dir:
     local_version = os.path.join(script_dir, local_version)
     local = os.path.join(script_dir, local)
-libs.append(os.path.abspath(local_version))
-libs.append(os.path.abspath(local))
+if os.path.isdir(local_version):
+    libs.append(os.path.abspath(local_version))
+if os.path.isdir(local):
+    libs.append(os.path.abspath(local))
 
 scons_version = 'scons-%s' % __version__
 
 # preferred order of scons lookup paths
 prefs = []
 
-
-# - running from egg check
+# if we can find package information, use it
 try:
     import pkg_resources
 except ImportError:
     pass
 else:
-    # when running from an egg add the egg's directory
     try:
         d = pkg_resources.get_distribution('scons')
     except pkg_resources.DistributionNotFound:
@@ -109,18 +113,18 @@ else:
         prefs.append(d.location)
 
 if sys.platform == 'win32':
-    # sys.prefix is (likely) C:\Python*;
-    # check only C:\Python*.
+    # Use only sys.prefix on Windows
     prefs.append(sys.prefix)
     prefs.append(os.path.join(sys.prefix, 'Lib', 'site-packages'))
 else:
     # On other (POSIX) platforms, things are more complicated due to
-    # the variety of path names and library locations.  Try to be smart
-    # about it.
+    # the variety of path names and library locations.
+    # Build up some possibilities, then transform them into candidates
+    temp = []
     if script_dir == 'bin':
         # script_dir is `pwd`/bin;
         # check `pwd`/lib/scons*.
-        prefs.append(os.getcwd())
+        temp.append(os.getcwd())
     else:
         if script_dir == '.' or script_dir == '':
             script_dir = os.getcwd()
@@ -128,42 +132,41 @@ else:
         if tail == "bin":
             # script_dir is /foo/bin;
             # check /foo/lib/scons*.
-            prefs.append(head)
+            temp.append(head)
 
     head, tail = os.path.split(sys.prefix)
     if tail == "usr":
         # sys.prefix is /foo/usr;
         # check /foo/usr/lib/scons* first,
         # then /foo/usr/local/lib/scons*.
-        prefs.append(sys.prefix)
-        prefs.append(os.path.join(sys.prefix, "local"))
+        temp.append(sys.prefix)
+        temp.append(os.path.join(sys.prefix, "local"))
     elif tail == "local":
         h, t = os.path.split(head)
         if t == "usr":
             # sys.prefix is /foo/usr/local;
             # check /foo/usr/local/lib/scons* first,
             # then /foo/usr/lib/scons*.
-            prefs.append(sys.prefix)
-            prefs.append(head)
+            temp.append(sys.prefix)
+            temp.append(head)
         else:
             # sys.prefix is /foo/local;
             # check only /foo/local/lib/scons*.
-            prefs.append(sys.prefix)
+            temp.append(sys.prefix)
     else:
         # sys.prefix is /foo (ends in neither /usr or /local);
         # check only /foo/lib/scons*.
-        prefs.append(sys.prefix)
+        temp.append(sys.prefix)
+
+    # suffix these to add to our original prefs:
+    prefs.extend([os.path.join(x, 'lib') for x in temp])
+    prefs.extend([os.path.join(x, 'lib', 'python' + sys.version[:3],
+                               'site-packages') for x in temp])
 
-    temp = [os.path.join(x, 'lib') for x in prefs]
-    temp.extend([os.path.join(x,
-                                           'lib',
-                                           'python' + sys.version[:3],
-                                           'site-packages') for x in prefs])
-    prefs = temp
 
     # Add the parent directory of the current python's library to the
-    # preferences.  On SuSE-91/AMD64, for example, this is /usr/lib64,
-    # not /usr/lib.
+    # preferences.  This picks up differences between, e.g., lib and lib64,
+    # and finds the base location in case of a non-copying virtualenv.
     try:
         libpath = os.__file__
     except AttributeError:
@@ -177,9 +180,9 @@ else:
         prefs.append(libpath)
 
 # Look first for 'scons-__version__' in all of our preference libs,
-# then for 'scons'.
-libs.extend([os.path.join(x, scons_version) for x in prefs])
-libs.extend([os.path.join(x, 'scons') for x in prefs])
+# then for 'scons'.  Skip paths that do not exist.
+libs.extend([os.path.join(x, scons_version) for x in prefs if os.path.isdir(x)])
+libs.extend([os.path.join(x, 'scons') for x in prefs if os.path.isdir(x)])
 
 sys.path = libs + sys.path
 
@@ -191,9 +194,9 @@ if __name__ == "__main__":
     try:
         import SCons.Script
     except ImportError:
-        print("SCons import failed. Unable to find engine files in:")
+        sys.stderr.write("SCons import failed. Unable to find engine files in:\n")
         for path in libs:
-            print("  {}".format(path))
+            sys.stderr.write("  {}\n".format(path))
         raise
 
     # this does all the work, and calls sys.exit
diff --git a/src/script/sconsign.py b/src/script/sconsign.py
index d3450ab..217193a 100644
--- a/src/script/sconsign.py
+++ b/src/script/sconsign.py
@@ -2,7 +2,7 @@
 #
 # SCons - a Software Constructor
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -25,15 +25,15 @@
 
 from __future__ import print_function
 
-__revision__ = "src/script/sconsign.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/script/sconsign.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
-__version__ = "3.0.0"
+__version__ = "3.0.5"
 
-__build__ = "rel_3.0.0:4395:8972f6a2f699"
+__build__ = "103260fce95bf5db1c35fb2371983087d85dd611"
 
-__buildsys__ = "ubuntu-16"
+__buildsys__ = "Williams-MBP-2"
 
-__date__ = "2017/09/18 12:59:24"
+__date__ = "2019-07-13 18:25:30"
 
 __developer__ = "bdbaddog"
 
@@ -49,48 +49,53 @@ import sys
 # should also change other scripts that use this same header.
 ##############################################################################
 
-# Strip the script directory from sys.path() so on case-insensitive
-# (WIN32) systems Python doesn't think that the "scons" script is the
-# "SCons" package.  Replace it with our own library directories
-# (version-specific first, in case they installed by hand there,
-# followed by generic) so we pick up the right version of the build
-# engine modules if they're in either directory.
-
-
-script_dir = sys.path[0]
+# compatibility check
+if (3,0,0) < sys.version_info < (3,5,0) or sys.version_info < (2,7,0):
+    msg = "scons: *** SCons version %s does not run under Python version %s.\n\
+Python 2.7 or >= 3.5 is required.\n"
+    sys.stderr.write(msg % (__version__, sys.version.split()[0]))
+    sys.exit(1)
 
-if script_dir in sys.path:
-    sys.path.remove(script_dir)
+# Strip the script directory from sys.path so on case-insensitive
+# (WIN32) systems Python doesn't think that the "scons" script is the
+# "SCons" package.
+script_dir = os.path.dirname(os.path.realpath(__file__))
+script_path = os.path.realpath(os.path.dirname(__file__))
+if script_path in sys.path:
+    sys.path.remove(script_path)
 
 libs = []
 
 if "SCONS_LIB_DIR" in os.environ:
     libs.append(os.environ["SCONS_LIB_DIR"])
 
-# - running from source takes priority (since 2.3.2), excluding SCONS_LIB_DIR settings
-script_path = os.path.abspath(os.path.dirname(__file__))
-source_path = os.path.join(script_path, '..', 'engine')
-libs.append(source_path)
+# running from source takes 2nd priority (since 2.3.2), following SCONS_LIB_DIR
+source_path = os.path.join(script_path, os.pardir, 'engine')
+if os.path.isdir(source_path):
+    libs.append(source_path)
 
+# add local-install locations
 local_version = 'scons-local-' + __version__
 local = 'scons-local'
 if script_dir:
     local_version = os.path.join(script_dir, local_version)
     local = os.path.join(script_dir, local)
-libs.append(os.path.abspath(local_version))
-libs.append(os.path.abspath(local))
+if os.path.isdir(local_version):
+    libs.append(os.path.abspath(local_version))
+if os.path.isdir(local):
+    libs.append(os.path.abspath(local))
 
 scons_version = 'scons-%s' % __version__
 
 # preferred order of scons lookup paths
 prefs = []
 
+# if we can find package information, use it
 try:
     import pkg_resources
 except ImportError:
     pass
 else:
-    # when running from an egg add the egg's directory
     try:
         d = pkg_resources.get_distribution('scons')
     except pkg_resources.DistributionNotFound:
@@ -99,18 +104,18 @@ else:
         prefs.append(d.location)
 
 if sys.platform == 'win32':
-    # sys.prefix is (likely) C:\Python*;
-    # check only C:\Python*.
+    # Use only sys.prefix on Windows
     prefs.append(sys.prefix)
     prefs.append(os.path.join(sys.prefix, 'Lib', 'site-packages'))
 else:
     # On other (POSIX) platforms, things are more complicated due to
-    # the variety of path names and library locations.  Try to be smart
-    # about it.
+    # the variety of path names and library locations.
+    # Build up some possibilities, then transform them into candidates
+    temp = []
     if script_dir == 'bin':
         # script_dir is `pwd`/bin;
         # check `pwd`/lib/scons*.
-        prefs.append(os.getcwd())
+        temp.append(os.getcwd())
     else:
         if script_dir == '.' or script_dir == '':
             script_dir = os.getcwd()
@@ -118,58 +123,57 @@ else:
         if tail == "bin":
             # script_dir is /foo/bin;
             # check /foo/lib/scons*.
-            prefs.append(head)
+            temp.append(head)
 
     head, tail = os.path.split(sys.prefix)
     if tail == "usr":
         # sys.prefix is /foo/usr;
         # check /foo/usr/lib/scons* first,
         # then /foo/usr/local/lib/scons*.
-        prefs.append(sys.prefix)
-        prefs.append(os.path.join(sys.prefix, "local"))
+        temp.append(sys.prefix)
+        temp.append(os.path.join(sys.prefix, "local"))
     elif tail == "local":
         h, t = os.path.split(head)
         if t == "usr":
             # sys.prefix is /foo/usr/local;
             # check /foo/usr/local/lib/scons* first,
             # then /foo/usr/lib/scons*.
-            prefs.append(sys.prefix)
-            prefs.append(head)
+            temp.append(sys.prefix)
+            temp.append(head)
         else:
             # sys.prefix is /foo/local;
             # check only /foo/local/lib/scons*.
-            prefs.append(sys.prefix)
+            temp.append(sys.prefix)
     else:
         # sys.prefix is /foo (ends in neither /usr or /local);
         # check only /foo/lib/scons*.
-        prefs.append(sys.prefix)
+        temp.append(sys.prefix)
+
+    # suffix these to add to our original prefs:
+    prefs.extend([os.path.join(x, 'lib') for x in temp])
+    prefs.extend([os.path.join(x, 'lib', 'python' + sys.version[:3],
+                               'site-packages') for x in temp])
 
-    temp = [os.path.join(x, 'lib') for x in prefs]
-    temp.extend([os.path.join(x,
-                                           'lib',
-                                           'python' + sys.version[:3],
-                                           'site-packages') for x in prefs])
-    prefs = temp
 
     # Add the parent directory of the current python's library to the
-    # preferences.  On SuSE-91/AMD64, for example, this is /usr/lib64,
-    # not /usr/lib.
+    # preferences.  This picks up differences between, e.g., lib and lib64,
+    # and finds the base location in case of a non-copying virtualenv.
     try:
         libpath = os.__file__
     except AttributeError:
         pass
     else:
         # Split /usr/libfoo/python*/os.py to /usr/libfoo/python*.
-        libpath, tail = os.path.split(libpath)
+        libpath, _ = os.path.split(libpath)
         # Split /usr/libfoo/python* to /usr/libfoo
         libpath, tail = os.path.split(libpath)
         # Check /usr/libfoo/scons*.
         prefs.append(libpath)
 
 # Look first for 'scons-__version__' in all of our preference libs,
-# then for 'scons'.
-libs.extend([os.path.join(x, scons_version) for x in prefs])
-libs.extend([os.path.join(x, 'scons') for x in prefs])
+# then for 'scons'.  Skip paths that do not exist.
+libs.extend([os.path.join(x, scons_version) for x in prefs if os.path.isdir(x)])
+libs.extend([os.path.join(x, 'scons') for x in prefs if os.path.isdir(x)])
 
 sys.path = libs + sys.path
 
@@ -191,6 +195,7 @@ import imp
 
 import SCons.SConsign
 
+
 def my_whichdb(filename):
     if filename[-7:] == ".dblite":
         return "SCons.dblite"
@@ -221,24 +226,41 @@ def my_import(mname):
         fp, pathname, description = imp.find_module(mname)
     return imp.load_module(mname, fp, pathname, description)
 
+
 class Flagger(object):
     default_value = 1
+
     def __setitem__(self, item, value):
         self.__dict__[item] = value
         self.default_value = 0
+
     def __getitem__(self, item):
         return self.__dict__.get(item, self.default_value)
 
+
 Do_Call = None
 Print_Directories = []
 Print_Entries = []
 Print_Flags = Flagger()
 Verbose = 0
 Readable = 0
+Warns = 0
+
+
 
 def default_mapper(entry, name):
+    '''
+    Stringify an entry that doesn't have an explicit mapping.
+
+    Args:
+        entry:  entry
+        name: field name
+
+    Returns: str
+
+    '''
     try:
-        val = eval("entry."+name)
+        val = eval("entry." + name)
     except:
         val = None
     if sys.version_info.major >= 3 and isinstance(val, bytes):
@@ -248,7 +270,18 @@ def default_mapper(entry, name):
         val = val.decode()
     return str(val)
 
-def map_action(entry, name):
+
+def map_action(entry, _):
+    '''
+    Stringify an action entry and signature.
+
+    Args:
+        entry: action entry
+        second argument is not used
+
+    Returns: str
+
+    '''
     try:
         bact = entry.bact
         bactsig = entry.bactsig
@@ -256,7 +289,17 @@ def map_action(entry, name):
         return None
     return '%s [%s]' % (bactsig, bact)
 
-def map_timestamp(entry, name):
+def map_timestamp(entry, _):
+    '''
+    Stringify a timestamp entry.
+
+    Args:
+        entry: timestamp entry
+        second argument is not used
+
+    Returns: str
+
+    '''
     try:
         timestamp = entry.timestamp
     except AttributeError:
@@ -266,19 +309,38 @@ def map_timestamp(entry, name):
     else:
         return str(timestamp)
 
-def map_bkids(entry, name):
+def map_bkids(entry, _):
+    '''
+    Stringify an implicit entry.
+
+    Args:
+        entry:
+        second argument is not used
+
+    Returns: str
+
+    '''
     try:
         bkids = entry.bsources + entry.bdepends + entry.bimplicit
         bkidsigs = entry.bsourcesigs + entry.bdependsigs + entry.bimplicitsigs
     except AttributeError:
         return None
-    result = []
-    for i in range(len(bkids)):
-        result.append(nodeinfo_string(bkids[i], bkidsigs[i], "        "))
-    if result == []:
+
+    if len(bkids) != len(bkidsigs):
+        global Warns
+        Warns += 1
+        # add warning to result rather than direct print so it will line up
+        msg = "Warning: missing information, {} ids but {} sigs"
+        result = [msg.format(len(bkids), len(bkidsigs))]
+    else:
+        result = []
+    result += [nodeinfo_string(bkid, bkidsig, "        ")
+               for bkid, bkidsig in zip(bkids, bkidsigs)]
+    if not result:
         return None
     return "\n        ".join(result)
 
+
 map_field = {
     'action'    : map_action,
     'timestamp' : map_timestamp,
@@ -289,6 +351,7 @@ map_name = {
     'implicit'  : 'bkids',
 }
 
+
 def field(name, entry, verbose=Verbose):
     if not Print_Flags[name]:
         return None
@@ -299,6 +362,7 @@ def field(name, entry, verbose=Verbose):
         val = name + ": " + val
     return val
 
+
 def nodeinfo_raw(name, ninfo, prefix=""):
     # This just formats the dictionary, which we would normally use str()
     # to do, except that we want the keys sorted for deterministic output.
@@ -314,6 +378,7 @@ def nodeinfo_raw(name, ninfo, prefix=""):
         name = repr(name)
     return name + ': {' + ', '.join(l) + '}'
 
+
 def nodeinfo_cooked(name, ninfo, prefix=""):
     try:
         field_list = ninfo.field_list
@@ -321,15 +386,19 @@ def nodeinfo_cooked(name, ninfo, prefix=""):
         field_list = []
     if '\n' in name:
         name = repr(name)
-    outlist = [name+':'] + [_f for _f in [field(x, ninfo, Verbose) for x in field_list] if _f]
+    outlist = [name + ':'] + [
+        f for f in [field(x, ninfo, Verbose) for x in field_list] if f
+    ]
     if Verbose:
         sep = '\n    ' + prefix
     else:
         sep = ' '
     return sep.join(outlist)
 
+
 nodeinfo_string = nodeinfo_cooked
 
+
 def printfield(name, entry, prefix=""):
     outlist = field("implicit", entry, 0)
     if outlist:
@@ -343,13 +412,15 @@ def printfield(name, entry, prefix=""):
         else:
             print("        " + outact)
 
+
 def printentries(entries, location):
     if Print_Entries:
         for name in Print_Entries:
             try:
                 entry = entries[name]
             except KeyError:
-                sys.stderr.write("sconsign: no entry `%s' in `%s'\n" % (name, location))
+                err = "sconsign: no entry `%s' in `%s'\n" % (name, location)
+                sys.stderr.write(err)
             else:
                 try:
                     ninfo = entry.ninfo
@@ -369,6 +440,7 @@ def printentries(entries, location):
                 print(nodeinfo_string(name, entry.ninfo))
             printfield(name, entry.binfo)
 
+
 class Do_SConsignDB(object):
     def __init__(self, dbm_name, dbm):
         self.dbm_name = dbm_name
@@ -403,15 +475,17 @@ class Do_SConsignDB(object):
                     # Nope, that file doesn't even exist, so report that
                     # fact back.
                     print_e = e
-                sys.stderr.write("sconsign: %s\n" % (print_e))
+                sys.stderr.write("sconsign: %s\n" % print_e)
                 return
         except KeyboardInterrupt:
             raise
         except pickle.UnpicklingError:
-            sys.stderr.write("sconsign: ignoring invalid `%s' file `%s'\n" % (self.dbm_name, fname))
+            sys.stderr.write("sconsign: ignoring invalid `%s' file `%s'\n"
+                             % (self.dbm_name, fname))
             return
         except Exception as e:
-            sys.stderr.write("sconsign: ignoring invalid `%s' file `%s': %s\n" % (self.dbm_name, fname, e))
+            sys.stderr.write("sconsign: ignoring invalid `%s' file `%s': %s\n"
+                             % (self.dbm_name, fname, e))
             return
 
         if Print_Directories:
@@ -419,35 +493,44 @@ class Do_SConsignDB(object):
                 try:
                     val = db[dir]
                 except KeyError:
-                    sys.stderr.write("sconsign: no dir `%s' in `%s'\n" % (dir, args[0]))
+                    err = "sconsign: no dir `%s' in `%s'\n" % (dir, args[0])
+                    sys.stderr.write(err)
                 else:
                     self.printentries(dir, val)
         else:
             for dir in sorted(db.keys()):
                 self.printentries(dir, db[dir])
 
-    def printentries(self, dir, val):
-        print('=== ' + dir + ':')
+    @staticmethod
+    def printentries(dir, val):
+        try:
+            print('=== ' + dir + ':')
+        except TypeError:
+            print('=== ' + dir.decode() + ':')
         printentries(pickle.loads(val), dir)
 
+
 def Do_SConsignDir(name):
     try:
         fp = open(name, 'rb')
     except (IOError, OSError) as e:
-        sys.stderr.write("sconsign: %s\n" % (e))
+        sys.stderr.write("sconsign: %s\n" % e)
         return
     try:
         sconsign = SCons.SConsign.Dir(fp)
     except KeyboardInterrupt:
         raise
     except pickle.UnpicklingError:
-        sys.stderr.write("sconsign: ignoring invalid .sconsign file `%s'\n" % (name))
+        err = "sconsign: ignoring invalid .sconsign file `%s'\n" % (name)
+        sys.stderr.write(err)
         return
     except Exception as e:
-        sys.stderr.write("sconsign: ignoring invalid .sconsign file `%s': %s\n" % (name, e))
+        err = "sconsign: ignoring invalid .sconsign file `%s': %s\n" % (name, e)
+        sys.stderr.write(err)
         return
     printentries(sconsign.entries, args[0])
 
+
 ##############################################################################
 
 import getopt
@@ -489,8 +572,7 @@ for o, a in opts:
     elif o in ('-f', '--format'):
         # Try to map the given DB format to a known module
         # name, that we can then try to import...
-        Module_Map = {'dblite'   : 'SCons.dblite',
-                      'sconsign' : None}
+        Module_Map = {'dblite': 'SCons.dblite', 'sconsign': None}
         dbm_name = Module_Map.get(a, a)
         if dbm_name:
             try:
@@ -498,6 +580,7 @@ for o, a in opts:
                     dbm = my_import(dbm_name)
                 else:
                     import SCons.dblite
+
                     dbm = SCons.dblite
                     # Ensure that we don't ignore corrupt DB files,
                     # this was handled by calling my_import('SCons.dblite')
@@ -526,7 +609,6 @@ for o, a in opts:
     elif o in ('-v', '--verbose'):
         Verbose = 1
 
-
 if Do_Call:
     for a in args:
         Do_Call(a)
@@ -534,11 +616,12 @@ else:
     for a in args:
         dbm_name = whichdb(a)
         if dbm_name:
-            Map_Module = {'SCons.dblite' : 'dblite'}
+            Map_Module = {'SCons.dblite': 'dblite'}
             if dbm_name != "SCons.dblite":
                 dbm = my_import(dbm_name)
             else:
                 import SCons.dblite
+
                 dbm = SCons.dblite
                 # Ensure that we don't ignore corrupt DB files,
                 # this was handled by calling my_import('SCons.dblite')
@@ -548,6 +631,8 @@ else:
         else:
             Do_SConsignDir(a)
 
+    if Warns:
+        print("NOTE: there were %d warnings, please check output" % Warns)
 sys.exit(0)
 
 # Local Variables:
diff --git a/src/setup.py b/src/setup.py
index 7a2b84a..2d021c2 100644..100755
--- a/src/setup.py
+++ b/src/setup.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,6 +20,17 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+from __future__ import print_function
+
+
+import distutils.command.build_scripts
+import distutils.command.install_scripts
+import distutils.command.install_lib
+import distutils.command.install_data
+import distutils.command.install
+import distutils.core
+import distutils
+# import setuptools
 """
 NOTE: Installed SCons is not importable like usual Python packages. It is
       executed explicitly with command line scripts. This allows multiple
@@ -32,15 +43,14 @@ NOTE: Installed SCons is not importable like usual Python packages. It is
       below is dedicated to make it happen on various platforms.
 """
 
-from __future__ import print_function
 
-__revision__ = "src/setup.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/setup.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 import os
 import stat
 import sys
 
-Version = "3.0.0"
+Version = "3.0.5"
 
 man_pages = [
     'scons.1',
@@ -66,25 +76,6 @@ if not sys.platform == 'win32':
 else:
     is_win32 = 1
 
-import distutils
-import distutils.core
-import distutils.command.install
-import distutils.command.install_data
-import distutils.command.install_lib
-import distutils.command.install_scripts
-import distutils.command.build_scripts
-import distutils.msvccompiler
-
-
-def get_build_version():
-    """ monkey patch distutils msvc version if we're not on windows.
-    We need to use vc version 9 for python 2.7.x and it defaults to 6
-    for non-windows platforms and there is no way to override it besides
-    monkey patching"""
-    return 9
-
-
-distutils.msvccompiler.get_build_version = get_build_version
 
 _install = distutils.command.install.install
 _install_data = distutils.command.install_data.install_data
@@ -175,7 +166,7 @@ class install(_install):
         self.no_scons_script = 0
         self.no_version_script = 0
         self.install_bat = 0
-        self.no_install_bat = not is_win32
+        self.no_install_bat = False  # not is_win32
         self.install_man = 0
         self.no_install_man = is_win32
         self.standard_lib = 0
@@ -257,10 +248,12 @@ class install_lib(_install_lib):
             if Options.standalone_lib:
                 # ...but they asked for a standalone directory.
                 self.install_dir = os.path.join(prefix, "scons")
-            elif Options.version_lib or not Options.standard_lib:
+            elif Options.version_lib:
                 # ...they asked for a version-specific directory,
-                # or they get it by default.
                 self.install_dir = os.path.join(prefix, "scons-%s" % Version)
+            elif not Options.standard_lib:
+                # default.
+                self.install_dir = os.path.join(prefix, "scons")
 
         msg = "Installed SCons library modules into %s" % self.install_dir
         Installed.append(msg)
@@ -333,8 +326,8 @@ class install_scripts(_install_scripts):
             scons = os.path.join(self.install_dir, base)
             scons_ver = scons + '-' + Version
             if is_win32:
-                scons += '.py'
-                scons_ver += '.py'
+                scons = scons + '.py'
+                scons_ver = scons_ver + '.py'
             create_version_script(src, scons_ver)
             create_basename_script(src, scons, scons_ver)
 
@@ -362,7 +355,8 @@ class install_scripts(_install_scripts):
                     # Use symbolic versions of permissions so this script doesn't fail to parse under python3.x
                     exec_and_read_permission = stat.S_IXOTH | stat.S_IXUSR | stat.S_IXGRP | stat.S_IROTH | stat.S_IRUSR | stat.S_IRGRP
                     mode_mask = 4095  # Octal 07777 used because python3 has different octal syntax than python 2
-                    mode = ((os.stat(file)[stat.ST_MODE]) | exec_and_read_permission) & mode_mask
+                    mode = ((os.stat(file)[stat.ST_MODE]) |
+                            exec_and_read_permission) & mode_mask
                     # log.info("changing mode of %s to %o", file, mode)
                     os.chmod(file, mode)
                     # --- /distutils copy/paste ---
@@ -420,18 +414,19 @@ arguments = {
     'version': Version,
     'description': description,
     'long_description': long_description,
-    'author': 'Steven Knight',
-    'author_email': 'knight@baldmt.com',
+    'author': 'William Deegan',
+    'author_email': 'bill@baddogconsulting.com',
     'url': "http://www.scons.org/",
     'packages': ["SCons",
                  "SCons.compat",
                  "SCons.Node",
-                 "SCons.Options",
                  "SCons.Platform",
                  "SCons.Scanner",
                  "SCons.Script",
                  "SCons.Tool",
+                 "SCons.Tool.clangCommon",
                  "SCons.Tool.docbook",
+                 'SCons.Tool.clangCommon',
                  "SCons.Tool.MSCommon",
                  "SCons.Tool.packaging",
                  "SCons.Variables",
@@ -512,7 +507,7 @@ arguments = {
                  'install_lib': install_lib,
                  'install_data': install_data,
                  'install_scripts': install_scripts,
-                 'build_scripts': build_scripts}
+                 'build_scripts': build_scripts},
 }
 
 distutils.core.setup(**arguments)
diff --git a/src/test_files.py b/src/test_files.py
index e552751..cab1045 100644
--- a/src/test_files.py
+++ b/src/test_files.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,7 +23,7 @@
 #
 from __future__ import print_function
 
-__revision__ = "src/test_files.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/test_files.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 """
 Verify that we have certain important files in our distribution
diff --git a/src/test_interrupts.py b/src/test_interrupts.py
index 744677f..6b8c7c3 100644
--- a/src/test_interrupts.py
+++ b/src/test_interrupts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,7 +23,7 @@
 
 from __future__ import print_function
 
-__revision__ = "src/test_interrupts.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/test_interrupts.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 """
 Verify that the SCons source code contains only correct handling of
diff --git a/src/test_pychecker.py b/src/test_pychecker.py
index b0c231f..058189e 100644
--- a/src/test_pychecker.py
+++ b/src/test_pychecker.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -22,7 +22,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 from __future__ import print_function
 
-__revision__ = "src/test_pychecker.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/test_pychecker.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 """
 Use pychecker to catch various Python coding errors.
diff --git a/src/test_setup.py b/src/test_setup.py
index af8ed66..2726465 100644
--- a/src/test_setup.py
+++ b/src/test_setup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,7 +23,7 @@
 #
 from __future__ import print_function
 
-__revision__ = "src/test_setup.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/test_setup.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 """
 Test how the setup.py script installs SCons.
diff --git a/src/test_strings.py b/src/test_strings.py
index ec62e82..59ac613 100644
--- a/src/test_strings.py
+++ b/src/test_strings.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright (c) 2001 - 2017 The SCons Foundation
+# Copyright (c) 2001 - 2019 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -23,7 +23,7 @@
 #
 from __future__ import print_function
 
-__revision__ = "src/test_strings.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog"
+__revision__ = "src/test_strings.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
 
 """
 Verify that we have proper strings like Copyright notices on all the
@@ -107,8 +107,8 @@ class Checker(object):
 
 class CheckUnexpandedStrings(Checker):
     expressions = [
-        re.compile('Copyright (c) 2001 - 2017 The SCons Foundation'),
-        re.compile('src/test_strings.py rel_3.0.0:4395:8972f6a2f699 2017/09/18 12:59:24 bdbaddog'),
+        re.compile('Copyright (c) 2001 - 2019 The SCons Foundation'),
+        re.compile('src/test_strings.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog'),
     ]
     def must_be_built(self):
         return None
@@ -208,12 +208,10 @@ check_list = [
             'doc/user/SCons-win32-install-4.jpg',
             'examples',
             'gentoo',
-            'QMTest/classes.qmc',
-            'QMTest/configuration',
-            'QMTest/TestCmd.py',
-            'QMTest/TestCmdTests.py',
-            'QMTest/TestCommon.py',
-            'QMTest/TestCommonTests.py',
+            'testing/framework/TestCmd.py',
+            'testing/framework/TestCmdTests.py',
+            'testing/framework/TestCommon.py',
+            'testing/framework/TestCommonTests.py',
             'src/MANIFEST.in',
             'src/setup.cfg',
             'src/engine/MANIFEST.in',
author	Jörg Frings-Fürst <debian@jff-webhosting.net>	2019-07-14 08:35:24 +0200
committer	Jörg Frings-Fürst <debian@jff-webhosting.net>	2019-07-14 08:35:24 +0200
commit	697e33ed224b539a42ff68121f7497f5bbf941b2 (patch)
tree	44ae83ad6ad4a7f6762a6d1bfde3766a1993b5ec /src
parent	baee03c569c91b745a1e025660b19a718db16e7d (diff)