Update upstream source from tag 'upstream/3.1.0'

Update to upstream version '3.1.0'
with Debian dir 248b875f378ce1bab3315f6ed2cecdf63a4cc3cc

131 files changed, 838 insertions, 669 deletions

diff --git a/engine/SCons/Tool/386asm.py b/engine/SCons/Tool/386asm.py
index c01f09e..1121c3d 100644
--- a/engine/SCons/Tool/386asm.py
+++ b/engine/SCons/Tool/386asm.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/386asm.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.PharLapCommon import addPharLapPaths
 import SCons.Util
diff --git a/engine/SCons/Tool/DCommon.py b/engine/SCons/Tool/DCommon.py
index c4e42d0..f6b6000 100644
--- a/engine/SCons/Tool/DCommon.py
+++ b/engine/SCons/Tool/DCommon.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/DCommon.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
diff --git a/engine/SCons/Tool/FortranCommon.py b/engine/SCons/Tool/FortranCommon.py
index 9287396..11f1eb7 100644
--- a/engine/SCons/Tool/FortranCommon.py
+++ b/engine/SCons/Tool/FortranCommon.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/FortranCommon.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import re
 import os.path
@@ -64,7 +64,8 @@ def _fortranEmitter(target, source, env):
     if not node.exists() and not node.is_derived():
        print("Could not locate " + str(node.name))
        return ([], [])
-    mod_regex = """(?i)^\s*MODULE\s+(?!PROCEDURE)(\w+)"""
+    # This has to match the def_regex in the Fortran scanner
+    mod_regex = r"""(?i)^\s*MODULE\s+(?!PROCEDURE|SUBROUTINE|FUNCTION|PURE|ELEMENTAL)(\w+)"""
     cre = re.compile(mod_regex,re.M)
     # Retrieve all USE'd module names
     modules = cre.findall(node.get_text_contents())
diff --git a/engine/SCons/Tool/GettextCommon.py b/engine/SCons/Tool/GettextCommon.py
index 37da33a..79912b6 100644
--- a/engine/SCons/Tool/GettextCommon.py
+++ b/engine/SCons/Tool/GettextCommon.py
@@ -4,7 +4,7 @@ Used by several tools of `gettext` toolset.
 """
 
 # 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
@@ -12,10 +12,10 @@ Used by several tools of `gettext` toolset.
 # 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
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/GettextCommon.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Warnings
 import re
@@ -71,7 +71,7 @@ SCons.Warnings.enableWarningClass(MsgfmtNotFound)
 #############################################################################
 class _POTargetFactory(object):
     """ A factory of `PO` target files.
-    
+
     Factory defaults differ from these of `SCons.Node.FS.FS`.  We set `precious`
     (this is required by builders and actions gettext) and `noclean` flags by
     default for all produced nodes.
@@ -80,9 +80,9 @@ class _POTargetFactory(object):
     def __init__(self, env, nodefault=True, alias=None, precious=True
                  , noclean=True):
         """ Object constructor.
-    
+
         **Arguments**
-    
+
             - *env* (`SCons.Environment.Environment`)
             - *nodefault* (`boolean`) - if `True`, produced nodes will be ignored
               from default target `'.'`
@@ -160,13 +160,13 @@ from SCons.Builder import BuilderBase
 #############################################################################
 class _POFileBuilder(BuilderBase):
     """ `PO` file builder.
-  
+
     This is multi-target single-source builder. In typical situation the source
     is single `POT` file, e.g. `messages.pot`, and there are multiple `PO`
     targets to be updated from this `POT`. We must run
     `SCons.Builder.BuilderBase._execute()` separatelly for each target to track
     dependencies separatelly for each target file.
-    
+
     **NOTE**: if we call `SCons.Builder.BuilderBase._execute(.., target, ...)`
     with target being list of all targets, all targets would be rebuilt each time
     one of the targets from this list is missing. This would happen, for example,
@@ -198,29 +198,29 @@ class _POFileBuilder(BuilderBase):
     #  After that it calls emitter (which is quite too late). The emitter is
     #  also called in each iteration, what makes things yet worse.
     def __init__(self, env, **kw):
-        if not 'suffix' in kw:
+        if 'suffix' not in kw:
             kw['suffix'] = '$POSUFFIX'
-        if not 'src_suffix' in kw:
+        if 'src_suffix' not in kw:
             kw['src_suffix'] = '$POTSUFFIX'
-        if not 'src_builder' in kw:
+        if 'src_builder' not in kw:
             kw['src_builder'] = '_POTUpdateBuilder'
-        if not 'single_source' in kw:
+        if 'single_source' not in kw:
             kw['single_source'] = True
         alias = None
         if 'target_alias' in kw:
             alias = kw['target_alias']
             del kw['target_alias']
-        if not 'target_factory' in kw:
+        if 'target_factory' not in kw:
             kw['target_factory'] = _POTargetFactory(env, alias=alias).File
         BuilderBase.__init__(self, **kw)
 
     def _execute(self, env, target, source, *args, **kw):
         """ Execute builder's actions.
-        
-        Here we append to `target` the languages read from `$LINGUAS_FILE` and 
+
+        Here we append to `target` the languages read from `$LINGUAS_FILE` and
         apply `SCons.Builder.BuilderBase._execute()` separatelly to each target.
         The arguments and return value are same as for
-        `SCons.Builder.BuilderBase._execute()`. 
+        `SCons.Builder.BuilderBase._execute()`.
         """
         import SCons.Util
         import SCons.Node
@@ -272,7 +272,7 @@ def _translate(env, target=None, source=SCons.Environment._null, *args, **kw):
 class RPaths(object):
     """ Callable object, which returns pathnames relative to SCons current
     working directory.
-  
+
     It seems like `SCons.Node.FS.Base.get_path()` returns absolute paths
     for nodes that are outside of current working directory (`env.fs.getcwd()`).
     Here, we often have `SConscript`, `POT` and `PO` files within `po/`
@@ -285,17 +285,17 @@ class RPaths(object):
     the references would be correct only on the machine, where `POT` file was
     recently re-created. For such reason, we need a function, which always
     returns relative paths. This is the purpose of `RPaths` callable object.
-  
+
     The `__call__` method returns paths relative to current working directory, but
     we assume, that *xgettext(1)* is run from the directory, where target file is
     going to be created.
-  
+
     Note, that this may not work for files distributed over several hosts or
     across different drives on windows. We assume here, that single local
     filesystem holds both source files and target `POT` templates.
-  
+
     Intended use of `RPaths` - in `xgettext.py`::
-  
+
       def generate(env):
           from GettextCommon import RPaths
           ...
@@ -318,9 +318,9 @@ class RPaths(object):
 
     def __init__(self, env):
         """ Initialize `RPaths` callable object.
-    
+
           **Arguments**:
-    
+
             - *env* - a `SCons.Environment.Environment` object, defines *current
               working dir*.
         """
@@ -329,16 +329,16 @@ class RPaths(object):
     # FIXME: I'm not sure, how it should be implemented (what the *args are in
     # general, what is **kw).
     def __call__(self, nodes, *args, **kw):
-        """ Return nodes' paths (strings) relative to current working directory. 
-        
+        """ Return nodes' paths (strings) relative to current working directory.
+
           **Arguments**:
-    
+
             - *nodes* ([`SCons.Node.FS.Base`]) - list of nodes.
             - *args* -  currently unused.
             - *kw* - currently unused.
-    
+
           **Returns**:
-    
+
            - Tuple of strings, which represent paths relative to current working
              directory (for given environment).
         """
diff --git a/engine/SCons/Tool/JavaCommon.py b/engine/SCons/Tool/JavaCommon.py
index 29ab007..1e58af6 100644
--- a/engine/SCons/Tool/JavaCommon.py
+++ b/engine/SCons/Tool/JavaCommon.py
@@ -27,7 +27,7 @@ Stuff for processing Java.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/JavaCommon.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/JavaCommon.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
@@ -42,6 +42,33 @@ default_java_version = '1.4'
 # anonymous inner class parsing.
 scopeStateVersions = ('1.8')
 
+# Glob patterns for use in finding where the JDK is.
+# These are pairs, *dir_glob used in the general case,
+# *version_dir_glob if matching only a specific version.
+# For now only used for Windows.
+java_win32_dir_glob = 'C:/Program Files*/Java/jdk*/bin'
+# On windows, since Java 9, there is a dash between 'jdk' and the version
+# string that wasn't there before. this glob should catch either way.
+java_win32_version_dir_glob = 'C:/Program Files*/Java/jdk*%s*/bin'
+
+# Glob patterns for use in finding where the JDK headers are.
+# These are pairs, *dir_glob used in the general case,
+# *version_dir_glob if matching only a specific version.
+java_macos_include_dir_glob = '/System/Library/Frameworks/JavaVM.framework/Headers/'
+java_macos_version_include_dir_glob = '/System/Library/Frameworks/JavaVM.framework/Versions/%s*/Headers/'
+
+java_linux_include_dirs_glob = [
+    '/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_glob = [
+    '/usr/lib/jvm/java-*-sun-%s*/include',
+    '/usr/lib/jvm/java-%s*-openjdk*/include',
+    '/usr/java/jdk%s*/include'
+]
+
 if java_parsing:
     # Parse Java files for class names.
     #
@@ -64,14 +91,15 @@ if java_parsing:
                           r'\d*\.\d*|[A-Za-z_][\w\$\.]*|<[A-Za-z_]\w+>|' +
                           r'/\*|\*/|\[\])')
 
+
     class OuterState(object):
         """The initial state for parsing a Java file for classes,
         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', '9.0', '10.0', '11.0'):
+        def __init__(self, version=default_java_version):
 
+            if version not 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', '12.0'):
                 msg = "Java version %s not supported" % version
                 raise NotImplementedError(msg)
 
@@ -131,15 +159,15 @@ 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] and \
-                            self.version not in scopeStateVersions:
+                    self.brackets == self.stackAnonClassBrackets[-1] and \
+                    self.version not in scopeStateVersions:
                 self._getAnonStack().pop()
                 self.stackAnonClassBrackets.pop()
 
@@ -152,13 +180,13 @@ if java_parsing:
                 self.openBracket()
             elif token == '}':
                 self.closeBracket()
-            elif token in [ '"', "'" ]:
+            elif token in ['"', "'"]:
                 return IgnoreState(token, self)
             elif token == "new":
                 # anonymous inner class
                 if len(self.listClasses) > 0:
                     return self.__getAnonClassState()
-                return self.__getSkipState() # Skip the class name
+                return self.__getSkipState()  # Skip the class name
             elif token in ['class', 'interface', 'enum']:
                 if len(self.listClasses) == 0:
                     self.nextAnon = 1
@@ -178,7 +206,7 @@ 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', '9.0', '10.0', '11.0'):
+            elif self.version in ('1.5', '1.6', '1.7', '1.8', '5', '6', '9.0', '10.0', '11.0', '12.0'):
                 self.stackAnonClassBrackets.append(self.brackets)
                 className = []
                 className.extend(self.listClasses)
@@ -193,11 +221,13 @@ if java_parsing:
         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
@@ -259,13 +289,16 @@ if java_parsing:
                 return self.__getSkipState()
             return self
 
+
     class AnonClassState(object):
         """A state that looks for anonymous inner classes."""
+
         def __init__(self, old_state):
             # outer_state is always an instance of OuterState
             self.outer_state = old_state.outer_state
             self.old_state = old_state
             self.brace_level = 0
+
         def parseToken(self, token):
             # This is an anonymous class if and only if the next
             # non-whitespace token is a bracket. Everything between
@@ -293,26 +326,32 @@ if java_parsing:
             if token == '{':
                 self.outer_state.addAnonClass()
                 if self.outer_state.version in scopeStateVersions:
-                    return ScopeState(old_state = self.old_state).parseToken(token)
+                    return ScopeState(old_state=self.old_state).parseToken(token)
             return self.old_state.parseToken(token)
 
+
     class SkipState(object):
         """A state that will skip a specified number of tokens before
         reverting to the previous state."""
+
         def __init__(self, tokens_to_skip, old_state):
             self.tokens_to_skip = tokens_to_skip
             self.old_state = old_state
+
         def parseToken(self, token):
             self.tokens_to_skip = self.tokens_to_skip - 1
             if self.tokens_to_skip < 1:
                 return self.old_state
             return self
 
+
     class ClassState(object):
         """A state we go into when we hit a class or interface keyword."""
+
         def __init__(self, outer_state):
             # outer_state is always an instance of OuterState
             self.outer_state = outer_state
+
         def parseToken(self, token):
             # the next non-whitespace token should be the name of the class
             if token == '\n':
@@ -322,12 +361,12 @@ if java_parsing:
             # 'Foo$1Inner'
             # 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]
-                    locals[token] = locals[token]+1
+                    locals[token] = locals[token] + 1
                 except KeyError:
                     locals[token] = 1
                 token = str(locals[token]) + token
@@ -336,32 +375,40 @@ if java_parsing:
             self.outer_state.anonStacksStack.append([0])
             return self.outer_state
 
+
     class IgnoreState(object):
         """A state that will ignore all tokens until it gets to a
         specified token."""
+
         def __init__(self, ignore_until, old_state):
             self.ignore_until = ignore_until
             self.old_state = old_state
+
         def parseToken(self, token):
             if self.ignore_until == token:
                 return self.old_state
             return self
 
+
     class PackageState(object):
         """The state we enter when we encounter the package keyword.
         We assume the next token will be the package name."""
+
         def __init__(self, outer_state):
             # outer_state is always an instance of OuterState
             self.outer_state = outer_state
+
         def parseToken(self, token):
             self.outer_state.setPackage(token)
             return self.outer_state
 
+
     def parse_java_file(fn, version=default_java_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,
         plus a list of .class files that compiling that .java file will
@@ -395,81 +442,68 @@ else:
         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:
+    Find the java jdk installation directories.
+
+    This list is intended to supply as "default paths" for use when looking
+    up actual java binaries.
+
+    :param platform: selector for search algorithm.
     :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)
+            paths = glob.glob(java_win32_version_dir_glob % version)
         else:
             paths = glob.glob(java_win32_dir_glob)
     else:
-        # do nothing for now
+        # other platforms, do nothing for now
         pass
 
-    paths=sorted(paths)
+    return sorted(paths)
 
-    return paths
 
 def get_java_include_paths(env, javac, version):
     """
-    Return java include paths
-    :param platform:
-    :param javac:
-    :return:
+    Find java include paths for JNI building.
+
+    :param env: construction environment, used to extract platform.
+    :param javac: path to detected javac.
+    :return: list of paths.
     """
+
     paths = []
     if not javac:
         # there are no paths if we've not detected javac.
         pass
     elif env['PLATFORM'] == 'win32':
+        # on Windows, we have the right path to javac, so look locally
         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]
+            paths = [java_macos_include_dir_glob]
         else:
-            paths = sorted(glob.glob(java_macos_version_include_dir%version))
+            paths = sorted(glob.glob(java_macos_version_include_dir_glob % version))
     else:
-        base_paths=[]
+        base_paths = []
         if not version:
-            for p in java_linux_include_dirs:
+            for p in java_linux_include_dirs_glob:
                 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 java_linux_version_include_dirs_glob:
+                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
-
-
+            paths.extend([p, os.path.join(p, 'linux')])
 
+    # print("PATHS:%s"%paths)
+    return paths
 
 # Local Variables:
 # tab-width:4
diff --git a/engine/SCons/Tool/MSCommon/__init__.py b/engine/SCons/Tool/MSCommon/__init__.py
index 2fb9c99..e3c4471 100644
--- a/engine/SCons/Tool/MSCommon/__init__.py
+++ b/engine/SCons/Tool/MSCommon/__init__.py
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/__init__.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/MSCommon/__init__.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 __doc__ = """
 Common functions for Microsoft Visual Studio and Visual C/C++.
diff --git a/engine/SCons/Tool/MSCommon/arch.py b/engine/SCons/Tool/MSCommon/arch.py
index 12ff1f9..6312541 100644
--- a/engine/SCons/Tool/MSCommon/arch.py
+++ b/engine/SCons/Tool/MSCommon/arch.py
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/arch.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/MSCommon/arch.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 __doc__ = """Module to define supported Windows chip architectures.
 """
diff --git a/engine/SCons/Tool/MSCommon/common.py b/engine/SCons/Tool/MSCommon/common.py
index 041c394..8353944 100644
--- a/engine/SCons/Tool/MSCommon/common.py
+++ b/engine/SCons/Tool/MSCommon/common.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/MSCommon/common.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import copy
 import os
@@ -34,7 +34,6 @@ import re
 
 import SCons.Util
 
-
 LOGFILE = os.environ.get('SCONS_MSCOMMON_DEBUG')
 if LOGFILE == '-':
     def debug(message):
@@ -117,7 +116,7 @@ def normalize_env(env, keys, force=False):
             normenv[k] = copy.deepcopy(env[k])
 
         for k in keys:
-            if k in os.environ and (force or not k in normenv):
+            if k in os.environ and (force or k not in normenv):
                 normenv[k] = os.environ[k]
 
     # This shouldn't be necessary, since the default environment should include system32,
diff --git a/engine/SCons/Tool/MSCommon/netframework.py b/engine/SCons/Tool/MSCommon/netframework.py
index a32a05d..edd9fd9 100644
--- a/engine/SCons/Tool/MSCommon/netframework.py
+++ b/engine/SCons/Tool/MSCommon/netframework.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/MSCommon/netframework.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 __doc__ = """
 """
@@ -68,7 +68,7 @@ def query_versions():
             # sequence comparison in python is lexicographical
             # which is exactly what we want.
             # Note we sort backwards so the highest version is first.
-            return cmp(bbl,aal)
+            return (aal > bbl) - (aal < bbl)
 
         versions.sort(versrt)
     else:
diff --git a/engine/SCons/Tool/MSCommon/sdk.py b/engine/SCons/Tool/MSCommon/sdk.py
index aa89f2a..e664a30 100644
--- a/engine/SCons/Tool/MSCommon/sdk.py
+++ b/engine/SCons/Tool/MSCommon/sdk.py
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/sdk.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/MSCommon/sdk.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 __doc__ = """Module to detect the Platform/Windows SDK
 
diff --git a/engine/SCons/Tool/MSCommon/vc.py b/engine/SCons/Tool/MSCommon/vc.py
index 1f1332e..fa7be96 100644
--- a/engine/SCons/Tool/MSCommon/vc.py
+++ b/engine/SCons/Tool/MSCommon/vc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/MSCommon/vc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 __doc__ = """Module for Visual C/C++ detection and configuration.
 """
@@ -60,7 +60,10 @@ class VisualCException(Exception):
 class UnsupportedVersion(VisualCException):
     pass
 
-class UnsupportedArch(VisualCException):
+class MSVCUnsupportedHostArch(VisualCException):
+    pass
+
+class MSVCUnsupportedTargetArch(VisualCException):
     pass
 
 class MissingConfiguration(VisualCException):
@@ -89,17 +92,15 @@ _ARCH_TO_CANONICAL = {
     "aarch64"   : "arm64",
 }
 
-# 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",
+    ("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
@@ -174,25 +175,33 @@ def get_host_target(env):
 
     try:
         host = _ARCH_TO_CANONICAL[host_platform.lower()]
-    except KeyError as e:
+    except KeyError:
         msg = "Unrecognized host architecture %s"
-        raise ValueError(msg % repr(host_platform))
+        raise MSVCUnsupportedHostArch(msg % repr(host_platform))
 
     try:
         target = _ARCH_TO_CANONICAL[target_platform.lower()]
-    except KeyError as e:
+    except KeyError:
         all_archs = str(list(_ARCH_TO_CANONICAL.keys()))
-        raise ValueError("Unrecognized target architecture %s\n\tValid architectures: %s" % (target_platform, all_archs))
+        raise MSVCUnsupportedTargetArch("Unrecognized target architecture %s\n\tValid architectures: %s" % (target_platform, all_archs))
 
     return (host, target,req_target_platform)
 
 # If you update this, update SupportedVSList in Tool/MSCommon/vs.py, and the
 # MSVC_VERSION documentation in Tool/msvc.xml.
-_VCVER = ["14.1", "14.0", "14.0Exp", "12.0", "12.0Exp", "11.0", "11.0Exp", "10.0", "10.0Exp", "9.0", "9.0Exp","8.0", "8.0Exp","7.1", "7.0", "6.0"]
+_VCVER = ["14.2", "14.1", "14.0", "14.0Exp", "12.0", "12.0Exp", "11.0", "11.0Exp", "10.0", "10.0Exp", "9.0", "9.0Exp","8.0", "8.0Exp","7.1", "7.0", "6.0"]
+
+# if using vswhere, a further mapping is needed
+_VCVER_TO_VSWHERE_VER = {
+    '14.2' : '[16.0, 17.0)',
+    '14.1' : '[15.0, 16.0)',
+}
 
 _VCVER_TO_PRODUCT_DIR = {
+    '14.2' : [
+        (SCons.Util.HKEY_LOCAL_MACHINE, r'')], # VS 2019 doesn't set this key
     '14.1' : [
-        (SCons.Util.HKEY_LOCAL_MACHINE, r'')], # Visual Studio 2017 doesn't set this registry key anymore
+        (SCons.Util.HKEY_LOCAL_MACHINE, r'')], # VS 2017 doesn't set this key
     '14.0' : [
         (SCons.Util.HKEY_LOCAL_MACHINE, r'Microsoft\VisualStudio\14.0\Setup\VC\ProductDir')],
     '14.0Exp' : [
@@ -253,42 +262,40 @@ 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):
-    """Check if the given (host, target) tuple is supported for given version.
+    """Check if (host, target) pair is supported for a VC 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,
+    :note: only checks whether a given version *may* support the given (host,
         target), not that the toolchain is actually present on the machine.
+    :param tuple host_target: canonalized host-targets pair, e.g.
+        ("x86", "amd64") for cross compilation from 32 bit Windows to 64 bits.
+    :param str msvc_version: Visual C++ version (major.minor), e.g. "10.0"
+    :returns: True or False
     """
     # We assume that any Visual Studio version supports x86 as a target
     if host_target[1] != "x86":
         maj, min = msvc_version_to_maj_min(msvc_version)
         if maj < 8:
             return False
-
     return True
 
 
 def find_vc_pdir_vswhere(msvc_version):
     """
-    Find the MSVC product directory using vswhere.exe.
+    Find the MSVC product directory using the vswhere program.
 
-    Run it asking for specified version and get MSVS  install location
-    :param msvc_version:
+    :param msvc_version: MSVC version to search for
     :return: MSVC install dir or None
+    :raises UnsupportedVersion: if the version is not known by this file
     """
 
+    try:
+        vswhere_version = _VCVER_TO_VSWHERE_VER[msvc_version]
+    except KeyError:
+        debug("Unknown version of MSVC: %s" % msvc_version)
+        raise UnsupportedVersion("Unknown version %s" % msvc_version)
+
     # For bug 3333 - support default location of vswhere for both 64 and 32 bit windows
-    # installs. 
+    # installs.
     for pf in ['Program Files (x86)', 'Program Files']:
         vswhere_path = os.path.join(
             'C:\\',
@@ -300,31 +307,36 @@ def find_vc_pdir_vswhere(msvc_version):
         if os.path.exists(vswhere_path):
             # If we found vswhere, then use it.
             break
+    else:
+        # No vswhere on system, no install info available
+        return None
 
-    vswhere_cmd = [vswhere_path, '-products', '*', '-version', msvc_version, '-property', 'installationPath']
-
-    if os.path.exists(vswhere_path):
-        #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()
-        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
+    vswhere_cmd = [vswhere_path,
+                   '-products', '*',
+                   '-version', vswhere_version,
+                   '-property', 'installationPath']
+
+    #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()
+    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):
-    """Find the product directory for the given version.
+    """Find the MSVC 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
@@ -425,6 +437,8 @@ def find_batch_file(env,msvc_version,host_arch,target_arch):
 
 
 __INSTALLED_VCS_RUN = None
+_VC_TOOLS_VERSION_FILE_PATH = ['Auxiliary', 'Build', 'Microsoft.VCToolsVersion.default.txt']
+_VC_TOOLS_VERSION_FILE = os.sep.join(_VC_TOOLS_VERSION_FILE_PATH)
 
 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
@@ -459,7 +473,7 @@ def _check_cl_exists_in_vc_dir(env, vc_dir, msvc_version):
     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))
+    debug('_check_cl_exists_in_vc_dir(): host platform %s, target platform %s for version %s' % (host_platform, target_platform, msvc_version))
 
     ver_num = float(get_msvc_version_numeric(msvc_version))
 
@@ -468,7 +482,7 @@ def _check_cl_exists_in_vc_dir(env, vc_dir, msvc_version):
         # 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')
+        default_toolset_file = os.path.join(vc_dir, _VC_TOOLS_VERSION_FILE)
         try:
             with open(default_toolset_file) as f:
                 vc_specific_version = f.readlines()[0].strip()
@@ -480,11 +494,11 @@ def _check_cl_exists_in_vc_dir(env, vc_dir, msvc_version):
             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')
+        if host_trgt_dir is None:
+            debug('_check_cl_exists_in_vc_dir(): unsupported host/target platform combo: (%s,%s)'%(host_platform, target_platform))
             return False
 
-        cl_path = os.path.join(vc_dir, r'Tools\MSVC', vc_specific_version, 'bin', host_trgt_dir, _CL_EXE_NAME)
+        cl_path = os.path.join(vc_dir, 'Tools','MSVC', vc_specific_version, 'bin',  host_trgt_dir[0], host_trgt_dir[1], _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 + '!')
@@ -492,8 +506,10 @@ def _check_cl_exists_in_vc_dir(env, vc_dir, msvc_version):
 
     elif ver_num <= 14 and ver_num >= 8:
 
+        # Set default value to be -1 as "" which is the value for x86/x86 yields true when tested
+        # if not host_trgt_dir
         host_trgt_dir = _HOST_TARGET_TO_CL_DIR.get((host_platform, target_platform), None)
-        if not host_trgt_dir:
+        if host_trgt_dir is None:
             debug('_check_cl_exists_in_vc_dir(): unsupported host/target platform combo')
             return False
 
@@ -505,8 +521,11 @@ def _check_cl_exists_in_vc_dir(env, vc_dir, msvc_version):
             # 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)
+
+            # Set default value to be -1 as "" which is the value for x86/x86 yields true when tested
+            # if not host_trgt_dir
             host_trgt_dir = _HOST_TARGET_TO_CL_DIR.get(('x86', target_platform), None)
-            if not host_trgt_dir:
+            if host_trgt_dir is None:
                 return False
 
             cl_path = os.path.join(vc_dir, 'bin', host_trgt_dir, _CL_EXE_NAME)
@@ -554,6 +573,10 @@ def get_installed_vcs(env=None):
                     debug('find_vc_pdir no compiler found %s' % ver)
             else:
                 debug('find_vc_pdir return None for ver %s' % ver)
+        except (MSVCUnsupportedTargetArch, MSVCUnsupportedHostArch):
+            # Allow this exception to propagate further as it should cause
+            # SCons to exit with an error code
+            raise
         except VisualCException as e:
             debug('did not find VC %s: caught exception %s' % (ver, str(e)))
     return installed_versions
diff --git a/engine/SCons/Tool/MSCommon/vs.py b/engine/SCons/Tool/MSCommon/vs.py
index f7f3de2..731f328 100644
--- a/engine/SCons/Tool/MSCommon/vs.py
+++ b/engine/SCons/Tool/MSCommon/vs.py
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/vs.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/MSCommon/vs.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 __doc__ = """Module to detect Visual Studio and/or Visual C/C++
 """
@@ -198,6 +198,17 @@ class VisualStudio(object):
 # Tool/MSCommon/vc.py, and the MSVC_VERSION documentation in Tool/msvc.xml.
 
 SupportedVSList = [
+    # Visual Studio 2019
+    VisualStudio('14.2',
+                 vc_version='14.2',
+                 sdk_version='10.0A',
+                 hkeys=[],
+                 common_tools_var='VS160COMNTOOLS',
+                 executable_path=r'Common7\IDE\devenv.com',
+                 batch_file_path=r'VC\Auxiliary\Build\vsvars32.bat',
+                 supported_arch=['x86', 'amd64', "arm"],
+                 ),
+
     # Visual Studio 2017
     VisualStudio('14.1',
                  vc_version='14.1',
@@ -520,7 +531,7 @@ def get_default_arch(env):
 
     if not msvs:
         arch = 'x86'
-    elif not arch in msvs.get_supported_arch():
+    elif arch not in msvs.get_supported_arch():
         fmt = "Visual Studio version %s does not support architecture %s"
         raise SCons.Errors.UserError(fmt % (env['MSVS_VERSION'], arch))
 
diff --git a/engine/SCons/Tool/PharLapCommon.py b/engine/SCons/Tool/PharLapCommon.py
index b78dc2a..623f2a8 100644
--- a/engine/SCons/Tool/PharLapCommon.py
+++ b/engine/SCons/Tool/PharLapCommon.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/PharLapCommon.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
@@ -79,7 +79,8 @@ def getPharLapVersion():
     include_path = os.path.join(getPharLapPath(), os.path.normpath("include/embkern.h"))
     if not os.path.exists(include_path):
         raise SCons.Errors.UserError("Cannot find embkern.h in ETS include directory.\nIs Phar Lap ETS installed properly?")
-    mo = REGEX_ETS_VER.search(open(include_path, 'r').read())
+    with open(include_path, 'r') as f:
+        mo = REGEX_ETS_VER.search(f.read())
     if mo:
         return int(mo.group(1))
     # Default return for Phar Lap 9.1
diff --git a/engine/SCons/Tool/__init__.py b/engine/SCons/Tool/__init__.py
index fcd9bca..271f214 100644
--- a/engine/SCons/Tool/__init__.py
+++ b/engine/SCons/Tool/__init__.py
@@ -35,10 +35,8 @@ 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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/__init__.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
-import imp
-import importlib
 import sys
 import re
 import os
@@ -53,7 +51,12 @@ import SCons.Scanner.D
 import SCons.Scanner.LaTeX
 import SCons.Scanner.Prog
 import SCons.Scanner.SWIG
-import collections
+try:
+    # Python 3
+    from collections.abc import Callable
+except ImportError:
+    # Python 2.7
+    from collections import Callable
 
 DefaultToolpath = []
 
@@ -106,7 +109,9 @@ TOOL_ALIASES = {
 
 
 class Tool(object):
-    def __init__(self, name, toolpath=[], **kw):
+    def __init__(self, name, toolpath=None, **kw):
+        if toolpath is None:
+            toolpath = []
 
         # Rename if there's a TOOL_ALIAS for this tool
         self.name = TOOL_ALIASES.get(name, name)
@@ -121,6 +126,8 @@ class Tool(object):
             self.options = module.options
 
     def _load_dotted_module_py2(self, short_name, full_name, searchpaths=None):
+        import imp
+
         splitname = short_name.split('.')
         index = 0
         srchpths = searchpaths
@@ -149,7 +156,7 @@ class Tool(object):
                 except ImportError as e:
                     splitname = self.name.split('.')
                     if str(e) != "No module named %s" % splitname[0]:
-                        raise SCons.Errors.EnvironmentError(e)
+                        raise SCons.Errors.SConsEnvironmentError(e)
                     try:
                         import zipimport
                     except ImportError:
@@ -211,13 +218,13 @@ class Tool(object):
 
             if spec is None:
                 error_string = "No module named %s" % self.name
-                raise SCons.Errors.EnvironmentError(error_string)
+                raise SCons.Errors.SConsEnvironmentError(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
-                raise SCons.Errors.EnvironmentError(error_string)
+                raise SCons.Errors.SConsEnvironmentError(error_string)
 
             # Don't reload a tool we already loaded.
             sys_modules_value = sys.modules.get(found_name, False)
@@ -258,7 +265,7 @@ class Tool(object):
                     return module
                 except ImportError as e:
                     if str(e) != "No module named %s" % self.name:
-                        raise SCons.Errors.EnvironmentError(e)
+                        raise SCons.Errors.SConsEnvironmentError(e)
                     try:
                         import zipimport
                         importer = zipimport.zipimporter(sys.modules['SCons.Tool'].__path__[0])
@@ -267,10 +274,10 @@ class Tool(object):
                         return module
                     except ImportError as e:
                         m = "No tool named '%s': %s" % (self.name, e)
-                        raise SCons.Errors.EnvironmentError(m)
+                        raise SCons.Errors.SConsEnvironmentError(m)
             except ImportError as e:
                 m = "No tool named '%s': %s" % (self.name, e)
-                raise SCons.Errors.EnvironmentError(m)
+                raise SCons.Errors.SConsEnvironmentError(m)
 
     def __call__(self, env, *args, **kw):
         if self.init_kw is not None:
@@ -376,7 +383,7 @@ 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, Callable):
             if Verbose:
                 print('_call_linker_cb: env["LINKCALLBACKS"][%r] is callable' % callback)
             result = cbfun(env, *args)
@@ -394,7 +401,8 @@ def _call_env_subst(env, string, *args, **kw):
 
 
 class _ShLibInfoSupport(object):
-    def get_libtype(self):
+    @property
+    def libtype(self):
         return 'ShLib'
 
     def get_lib_prefix(self, env, *args, **kw):
@@ -411,7 +419,8 @@ class _ShLibInfoSupport(object):
 
 
 class _LdModInfoSupport(object):
-    def get_libtype(self):
+    @property
+    def libtype(self):
         return 'LdMod'
 
     def get_lib_prefix(self, env, *args, **kw):
@@ -428,7 +437,8 @@ class _LdModInfoSupport(object):
 
 
 class _ImpLibInfoSupport(object):
-    def get_libtype(self):
+    @property
+    def libtype(self):
         return 'ImpLib'
 
     def get_lib_prefix(self, env, *args, **kw):
@@ -480,25 +490,21 @@ class _LibInfoGeneratorBase(object):
                         'ImpLib': _ImpLibInfoSupport}
 
     def __init__(self, libtype, infoname):
-        self.set_libtype(libtype)
-        self.set_infoname(infoname)
+        self.libtype = libtype
+        self.infoname = infoname
+
+    @property
+    def libtype(self):
+        return self._support.libtype
 
-    def set_libtype(self, libtype):
+    @libtype.setter
+    def libtype(self, libtype):
         try:
             support_class = self._support_classes[libtype]
         except KeyError:
             raise ValueError('unsupported libtype %r' % libtype)
         self._support = support_class()
 
-    def get_libtype(self):
-        return self._support.get_libtype()
-
-    def set_infoname(self, infoname):
-        self.infoname = infoname
-
-    def get_infoname(self):
-        return self.infoname
-
     def get_lib_prefix(self, env, *args, **kw):
         return self._support.get_lib_prefix(env, *args, **kw)
 
@@ -518,9 +524,8 @@ class _LibInfoGeneratorBase(object):
         try:
             libtype = kw['generator_libtype']
         except KeyError:
-            libtype = self.get_libtype()
-        infoname = self.get_infoname()
-        return 'Versioned%s%s' % (libtype, infoname)
+            libtype = self.libtype
+        return 'Versioned%s%s' % (libtype, self.infoname)
 
     def generate_versioned_lib_info(self, env, args, result=None, **kw):
         callback = self.get_versioned_lib_info_generator(**kw)
@@ -730,7 +735,7 @@ class _LibSonameGenerator(_LibInfoGeneratorBase):
 
         if not soname:
             # fallback to library name (as returned by appropriate _LibNameGenerator)
-            soname = _LibNameGenerator(self.get_libtype())(env, libnode)
+            soname = _LibNameGenerator(self.libtype)(env, libnode)
             if Verbose:
                 print("_LibSonameGenerator: FALLBACK: soname=%r" % soname)
 
@@ -1316,30 +1321,35 @@ def tool_list(platform, env):
     return [x for x in tools if x]
 
 
-def find_program_path(env, key_program, default_paths=[]):
+def find_program_path(env, key_program, default_paths=None):
     """
-    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.
+    Find the location of a tool using various means.
+
+    Mainly for windows where tools aren't all installed in /usr/bin, etc.
+
+    :param env: Current Construction Environment.
+    :param key_program: Tool to locate.
+    :param default_paths: List of additional paths this tool might be found in.
     """
     # First search in the SCons path
     path = env.WhereIs(key_program)
-    if (path):
+    if path:
         return path
-    # then the OS path:
+
+    # Then in the OS path
     path = SCons.Util.WhereIs(key_program)
-    if (path):
+    if path:
         return path
 
-    # If that doesn't work try default location for mingw
+    # Finally, add the defaults and check again. Do not change
+    # ['ENV']['PATH'] permananetly, the caller can do that if needed.
+    if default_paths is None:
+        return path
     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
+    env['ENV']['PATH'] = save_path
     return path
 
 # Local Variables:
diff --git a/engine/SCons/Tool/aixc++.py b/engine/SCons/Tool/aixc++.py
index 5ededea..bafaea4 100644
--- a/engine/SCons/Tool/aixc++.py
+++ b/engine/SCons/Tool/aixc++.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/aixc++.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 #forward proxy to the preffered cxx version
 from SCons.Tool.aixcxx import *
diff --git a/engine/SCons/Tool/aixcc.py b/engine/SCons/Tool/aixcc.py
index d58184b..349a40a 100644
--- a/engine/SCons/Tool/aixcc.py
+++ b/engine/SCons/Tool/aixcc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/aixcc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
diff --git a/engine/SCons/Tool/aixcxx.py b/engine/SCons/Tool/aixcxx.py
index c568366..0830e33 100644
--- a/engine/SCons/Tool/aixcxx.py
+++ b/engine/SCons/Tool/aixcxx.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/aixcxx.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
diff --git a/engine/SCons/Tool/aixf77.py b/engine/SCons/Tool/aixf77.py
index 54f196f..d2c619a 100644
--- a/engine/SCons/Tool/aixf77.py
+++ b/engine/SCons/Tool/aixf77.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/aixf77.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
diff --git a/engine/SCons/Tool/aixlink.py b/engine/SCons/Tool/aixlink.py
index 0d808be..ea2949f 100644
--- a/engine/SCons/Tool/aixlink.py
+++ b/engine/SCons/Tool/aixlink.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/aixlink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
diff --git a/engine/SCons/Tool/applelink.py b/engine/SCons/Tool/applelink.py
index dfb9d9d..011b29d 100644
--- a/engine/SCons/Tool/applelink.py
+++ b/engine/SCons/Tool/applelink.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/applelink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/ar.py b/engine/SCons/Tool/ar.py
index aee2426..459fb55 100644
--- a/engine/SCons/Tool/ar.py
+++ b/engine/SCons/Tool/ar.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/ar.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/as.py b/engine/SCons/Tool/as.py
index e0d0239..02139c5 100644
--- a/engine/SCons/Tool/as.py
+++ b/engine/SCons/Tool/as.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/as.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/bcc32.py b/engine/SCons/Tool/bcc32.py
index 17cd4fc..e8ffbbf 100644
--- a/engine/SCons/Tool/bcc32.py
+++ b/engine/SCons/Tool/bcc32.py
@@ -27,7 +27,7 @@ XXX
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/bcc32.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/bcc32.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
diff --git a/engine/SCons/Tool/c++.py b/engine/SCons/Tool/c++.py
index bdd067c..8819f82 100644
--- a/engine/SCons/Tool/c++.py
+++ b/engine/SCons/Tool/c++.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/c++.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 
 #forward proxy to the preffered cxx version
diff --git a/engine/SCons/Tool/cc.py b/engine/SCons/Tool/cc.py
index e00df46..698d725 100644
--- a/engine/SCons/Tool/cc.py
+++ b/engine/SCons/Tool/cc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/cc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Tool
 import SCons.Defaults
diff --git a/engine/SCons/Tool/clang.py b/engine/SCons/Tool/clang.py
index 83311eb..f48afbf 100644
--- a/engine/SCons/Tool/clang.py
+++ b/engine/SCons/Tool/clang.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+# __revision__ = "src/engine/SCons/Tool/clang.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 # Based on SCons/Tool/gcc.py by Paweł Tomulik 2014 as a separate tool.
 # Brought into the SCons mainline by Russel Winder 2017.
@@ -77,7 +77,8 @@ def generate(env):
                                      stdout=subprocess.PIPE)
         if pipe.wait() != 0: return
         # clang -dumpversion is of no use
-        line = pipe.stdout.readline()
+        with pipe.stdout:
+            line = pipe.stdout.readline()
         if sys.version_info[0] > 2:
             line = line.decode()
         match = re.search(r'clang +version +([0-9]+(?:\.[0-9]+)+)', line)
diff --git a/engine/SCons/Tool/clangxx.py b/engine/SCons/Tool/clangxx.py
index 6e4199e..d88874e 100644
--- a/engine/SCons/Tool/clangxx.py
+++ b/engine/SCons/Tool/clangxx.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+# __revision__ = "src/engine/SCons/Tool/clangxx.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 # Based on SCons/Tool/g++.py by Paweł Tomulik 2014 as a separate tool.
 # Brought into the SCons mainline by Russel Winder 2017.
@@ -85,7 +85,8 @@ def generate(env):
             return
         
         # clang -dumpversion is of no use
-        line = pipe.stdout.readline()
+        with pipe.stdout:
+            line = pipe.stdout.readline()
         if sys.version_info[0] > 2:
             line = line.decode()
         match = re.search(r'clang +version +([0-9]+(?:\.[0-9]+)+)', line)
diff --git a/engine/SCons/Tool/cvf.py b/engine/SCons/Tool/cvf.py
index dde3a3e..aa24d69 100644
--- a/engine/SCons/Tool/cvf.py
+++ b/engine/SCons/Tool/cvf.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/cvf.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from . import fortran
 
diff --git a/engine/SCons/Tool/cxx.py b/engine/SCons/Tool/cxx.py
index 85fb2fb..2ac278e 100644
--- a/engine/SCons/Tool/cxx.py
+++ b/engine/SCons/Tool/cxx.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/cxx.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
diff --git a/engine/SCons/Tool/cyglink.py b/engine/SCons/Tool/cyglink.py
index f69b886..c3d78de 100644
--- a/engine/SCons/Tool/cyglink.py
+++ b/engine/SCons/Tool/cyglink.py
@@ -133,7 +133,7 @@ def _versioned_lib_suffix(env, suffix, version):
     if Verbose:
         print("_versioned_lib_suffix: suffix= ", suffix)
         print("_versioned_lib_suffix: version= ", version)
-    cygversion = re.sub('\.', '-', version)
+    cygversion = re.sub(r'\.', '-', version)
     if not suffix.startswith('-' + cygversion):
         suffix = '-' + cygversion + suffix
     if Verbose:
diff --git a/engine/SCons/Tool/default.py b/engine/SCons/Tool/default.py
index 928e365..866b823 100644
--- a/engine/SCons/Tool/default.py
+++ b/engine/SCons/Tool/default.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/default.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Tool
 
diff --git a/engine/SCons/Tool/dmd.py b/engine/SCons/Tool/dmd.py
index d9bed9c..befcd22 100644
--- a/engine/SCons/Tool/dmd.py
+++ b/engine/SCons/Tool/dmd.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/dmd.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import subprocess
diff --git a/engine/SCons/Tool/docbook/__init__.py b/engine/SCons/Tool/docbook/__init__.py
index d7d10c0..147556d 100644
--- a/engine/SCons/Tool/docbook/__init__.py
+++ b/engine/SCons/Tool/docbook/__init__.py
@@ -84,7 +84,7 @@ def __extend_targets_sources(target, source):
         source = [source]
     if len(target) < len(source):
         target.extend(source[len(target):])
-        
+
     return target, source
 
 def __init_xsl_stylesheet(kw, env, user_xsl_var, default_path):
@@ -94,12 +94,12 @@ def __init_xsl_stylesheet(kw, env, user_xsl_var, default_path):
             path_args = [scriptpath, db_xsl_folder] + default_path
             xsl_style = os.path.join(*path_args)
         kw['DOCBOOK_XSL'] =  xsl_style
-    
+
 def __select_builder(lxml_builder, libxml2_builder, cmdline_builder):
     """ Selects a builder, based on which Python modules are present. """
     if prefer_xsltproc:
         return cmdline_builder
-    
+
     if not has_libxml2:
         # At the moment we prefer libxml2 over lxml, the latter can lead
         # to conflicts when installed together with libxml2.
@@ -115,7 +115,7 @@ def __ensure_suffix(t, suffix):
     tpath = str(t)
     if not tpath.endswith(suffix):
         return tpath+suffix
-    
+
     return t
 
 def __ensure_suffix_stem(t, suffix):
@@ -124,11 +124,11 @@ def __ensure_suffix_stem(t, suffix):
     if not tpath.endswith(suffix):
         stem = tpath
         tpath += suffix
-        
+
         return tpath, stem
     else:
         stem, ext = os.path.splitext(tpath)
-    
+
     return t, stem
 
 def __get_xml_text(root):
@@ -151,7 +151,7 @@ def __create_output_dir(base_dir):
     else:
         if base_dir.endswith('/'):
             dir = base_dir
-    
+
     if dir and not os.path.isdir(dir):
         os.makedirs(dir)
 
@@ -203,10 +203,10 @@ def _detect(env):
     the requested output formats.
     """
     global prefer_xsltproc
-    
+
     if env.get('DOCBOOK_PREFER_XSLTPROC',''):
         prefer_xsltproc = True
-        
+
     if ((not has_libxml2 and not has_lxml) or (prefer_xsltproc)):
         # Try to find the XSLT processors
         __detect_cl_tool(env, 'DOCBOOK_XSLTPROC', xsltproc_com, xsltproc_com_priority)
@@ -219,15 +219,15 @@ def _detect(env):
 #
 include_re = re.compile('fileref\\s*=\\s*["|\']([^\\n]*)["|\']')
 sentity_re = re.compile('<!ENTITY\\s+%*\\s*[^\\s]+\\s+SYSTEM\\s+["|\']([^\\n]*)["|\']>')
- 
+
 def __xml_scan(node, env, path, arg):
     """ Simple XML file scanner, detecting local images and XIncludes as implicit dependencies. """
     # Does the node exist yet?
     if not os.path.isfile(str(node)):
         return []
-    
+
     if env.get('DOCBOOK_SCANENT',''):
-        # Use simple pattern matching for system entities..., no support 
+        # Use simple pattern matching for system entities..., no support
         # for recursion yet.
         contents = node.get_text_contents()
         return sentity_re.findall(contents)
@@ -235,9 +235,9 @@ def __xml_scan(node, env, path, arg):
     xsl_file = os.path.join(scriptpath,'utils','xmldepend.xsl')
     if not has_libxml2 or prefer_xsltproc:
         if has_lxml and not prefer_xsltproc:
-            
+
             from lxml import etree
-            
+
             xsl_tree = etree.parse(xsl_file)
             doc = etree.parse(str(node))
             result = doc.xslt(xsl_tree)
@@ -266,7 +266,7 @@ def __xml_scan(node, env, path, arg):
     for x in str(result).splitlines():
         if x.strip() != "" and not x.startswith("<?xml "):
             depfiles.extend(x.strip().split())
-    
+
     style.freeStylesheet()
     doc.freeDoc()
     result.freeDoc()
@@ -282,7 +282,7 @@ docbook_xml_scanner = SCons.Script.Scanner(function = __xml_scan,
 # Action generators
 #
 def __generate_xsltproc_action(source, target, env, for_signature):
-    cmd = env['DOCBOOK_XSLTPROCCOM']    
+    cmd = env['DOCBOOK_XSLTPROCCOM']
     # Does the environment have a base_dir defined?
     base_dir = env.subst('$base_dir')
     if base_dir:
@@ -300,7 +300,7 @@ def __emit_xsl_basedir(target, source, env):
     if base_dir:
         # Yes, so prepend it to each target
         return [os.path.join(base_dir, str(t)) for t in target], source
-    
+
     # No, so simply pass target and source names through
     return target, source
 
@@ -334,11 +334,11 @@ def __build_lxml(target, source, env):
     General XSLT builder (HTML/FO), using the lxml module.
     """
     from lxml import etree
-    
-    xslt_ac = etree.XSLTAccessControl(read_file=True, 
-                                      write_file=True, 
-                                      create_dir=True, 
-                                      read_network=False, 
+
+    xslt_ac = etree.XSLTAccessControl(read_file=True,
+                                      write_file=True,
+                                      create_dir=True,
+                                      read_network=False,
                                       write_network=False)
     xsl_style = env.subst('$DOCBOOK_XSL')
     xsl_tree = etree.parse(xsl_style)
@@ -350,11 +350,10 @@ def __build_lxml(target, source, env):
         result = transform(doc, **parampass)
     else:
         result = transform(doc)
-        
+
     try:
-        of = open(str(target[0]), "wb")
-        of.write(of.write(etree.tostring(result, pretty_print=True)))
-        of.close()
+        with open(str(target[0]), "wb") as of:
+            of.write(etree.tostring(result, pretty_print=True))
     except:
         pass
 
@@ -376,11 +375,11 @@ def __xinclude_lxml(target, source, env):
     Resolving XIncludes, using the lxml module.
     """
     from lxml import etree
-    
+
     doc = etree.parse(str(source[0]))
     doc.xinclude()
     try:
-        doc.write(str(target[0]), xml_declaration=True, 
+        doc.write(str(target[0]), xml_declaration=True,
                   encoding="UTF-8", pretty_print=True)
     except:
         pass
@@ -432,33 +431,31 @@ def DocbookEpub(env, target, source=None, *args, **kw):
     """
     import zipfile
     import shutil
-    
+
     def build_open_container(target, source, env):
         """Generate the *.epub file from intermediate outputs
 
-        Constructs the epub file according to the Open Container Format. This 
+        Constructs the epub file according to the Open Container Format. This
         function could be replaced by a call to the SCons Zip builder if support
         was added for different compression formats for separate source nodes.
         """
-        zf = zipfile.ZipFile(str(target[0]), 'w')
-        mime_file = open('mimetype', 'w')
-        mime_file.write('application/epub+zip')
-        mime_file.close()
-        zf.write(mime_file.name, compress_type = zipfile.ZIP_STORED)
-        for s in source:
-            if os.path.isfile(str(s)):
-                head, tail = os.path.split(str(s))
-                if not head:
-                    continue
-                s = head
-            for dirpath, dirnames, filenames in os.walk(str(s)):
-                for fname in filenames:
-                    path = os.path.join(dirpath, fname)
-                    if os.path.isfile(path):
-                        zf.write(path, os.path.relpath(path, str(env.get('ZIPROOT', ''))),
-                            zipfile.ZIP_DEFLATED)
-        zf.close()
-        
+        with zipfile.ZipFile(str(target[0]), 'w') as zf:
+            with open('mimetype', 'w') as mime_file:
+                mime_file.write('application/epub+zip')
+            zf.write(mime_file.name, compress_type = zipfile.ZIP_STORED)
+            for s in source:
+                if os.path.isfile(str(s)):
+                    head, tail = os.path.split(str(s))
+                    if not head:
+                        continue
+                    s = head
+                for dirpath, dirnames, filenames in os.walk(str(s)):
+                    for fname in filenames:
+                        path = os.path.join(dirpath, fname)
+                        if os.path.isfile(path):
+                            zf.write(path, os.path.relpath(path, str(env.get('ZIPROOT', ''))),
+                                zipfile.ZIP_DEFLATED)
+
     def add_resources(target, source, env):
         """Add missing resources to the OEBPS directory
 
@@ -468,7 +465,7 @@ def DocbookEpub(env, target, source=None, *args, **kw):
         content_file = os.path.join(source[0].get_abspath(), 'content.opf')
         if not os.path.isfile(content_file):
             return
-        
+
         hrefs = []
         if has_libxml2:
             nsmap = {'opf' : 'http://www.idpf.org/2007/opf'}
@@ -495,51 +492,51 @@ def DocbookEpub(env, target, source=None, *args, **kw):
                     hrefs.append(item.attrib['href'])
 
             doc.freeDoc()
-            xpath_context.xpathFreeContext()            
+            xpath_context.xpathFreeContext()
         elif has_lxml:
             from lxml import etree
-            
+
             opf = etree.parse(content_file)
             # All the opf:item elements are resources
-            for item in opf.xpath('//opf:item', 
+            for item in opf.xpath('//opf:item',
                     namespaces= { 'opf': 'http://www.idpf.org/2007/opf' }):
                 hrefs.append(item.attrib['href'])
-        
+
         for href in hrefs:
-            # If the resource was not already created by DocBook XSL itself, 
+            # If the resource was not already created by DocBook XSL itself,
             # copy it into the OEBPS folder
             referenced_file = os.path.join(source[0].get_abspath(), href)
             if not os.path.exists(referenced_file):
                 shutil.copy(href, os.path.join(source[0].get_abspath(), href))
-        
+
     # Init list of targets/sources
     target, source = __extend_targets_sources(target, source)
-    
+
     # Init XSL stylesheet
     __init_xsl_stylesheet(kw, env, '$DOCBOOK_DEFAULT_XSL_EPUB', ['epub','docbook.xsl'])
 
     # Setup builder
     __builder = __select_builder(__lxml_builder, __libxml2_builder, __xsltproc_builder)
-    
+
     # Create targets
     result = []
-    if not env.GetOption('clean'):        
+    if not env.GetOption('clean'):
         # Ensure that the folders OEBPS and META-INF exist
         __create_output_dir('OEBPS/')
         __create_output_dir('META-INF/')
     dirs = env.Dir(['OEBPS', 'META-INF'])
-    
+
     # Set the fixed base_dir
     kw['base_dir'] = 'OEBPS/'
     tocncx = __builder.__call__(env, 'toc.ncx', source[0], **kw)
     cxml = env.File('META-INF/container.xml')
     env.SideEffect(cxml, tocncx)
-    
+
     env.Depends(tocncx, kw['DOCBOOK_XSL'])
     result.extend(tocncx+[cxml])
 
-    container = env.Command(__ensure_suffix(str(target[0]), '.epub'), 
-        tocncx+[cxml], [add_resources, build_open_container])    
+    container = env.Command(__ensure_suffix(str(target[0]), '.epub'),
+        tocncx+[cxml], [add_resources, build_open_container])
     mimetype = env.File('mimetype')
     env.SideEffect(mimetype, container)
 
@@ -555,13 +552,13 @@ def DocbookHtml(env, target, source=None, *args, **kw):
     """
     # Init list of targets/sources
     target, source = __extend_targets_sources(target, source)
-    
+
     # Init XSL stylesheet
     __init_xsl_stylesheet(kw, env, '$DOCBOOK_DEFAULT_XSL_HTML', ['html','docbook.xsl'])
 
     # Setup builder
     __builder = __select_builder(__lxml_builder, __libxml2_builder, __xsltproc_builder)
-    
+
     # Create targets
     result = []
     for t,s in zip(target,source):
@@ -583,18 +580,18 @@ def DocbookHtmlChunked(env, target, source=None, *args, **kw):
         target = ['index.html']
     elif not SCons.Util.is_List(source):
         source = [source]
-        
+
     # Init XSL stylesheet
     __init_xsl_stylesheet(kw, env, '$DOCBOOK_DEFAULT_XSL_HTMLCHUNKED', ['html','chunkfast.xsl'])
 
     # Setup builder
     __builder = __select_builder(__lxml_builder, __libxml2_builder, __xsltproc_builder)
-    
+
     # Detect base dir
     base_dir = kw.get('base_dir', '')
     if base_dir:
         __create_output_dir(base_dir)
-   
+
     # Create targets
     result = []
     r = __builder.__call__(env, __ensure_suffix(str(target[0]), '.html'), source[0], **kw)
@@ -617,8 +614,8 @@ def DocbookHtmlhelp(env, target, source=None, *args, **kw):
         source = target
         target = ['index.html']
     elif not SCons.Util.is_List(source):
-        source = [source]    
-    
+        source = [source]
+
     # Init XSL stylesheet
     __init_xsl_stylesheet(kw, env, '$DOCBOOK_DEFAULT_XSL_HTMLHELP', ['htmlhelp','htmlhelp.xsl'])
 
@@ -629,7 +626,7 @@ def DocbookHtmlhelp(env, target, source=None, *args, **kw):
     base_dir = kw.get('base_dir', '')
     if base_dir:
         __create_output_dir(base_dir)
-    
+
     # Create targets
     result = []
     r = __builder.__call__(env, __ensure_suffix(str(target[0]), '.html'), source[0], **kw)
@@ -687,30 +684,29 @@ def DocbookMan(env, target, source=None, *args, **kw):
         if os.path.isfile(srcfile):
             try:
                 import xml.dom.minidom
-                
+
                 dom = xml.dom.minidom.parse(__ensure_suffix(str(s),'.xml'))
                 # Extract volume number, default is 1
                 for node in dom.getElementsByTagName('refmeta'):
                     for vol in node.getElementsByTagName('manvolnum'):
                         volnum = __get_xml_text(vol)
-                        
+
                 # Extract output filenames
                 for node in dom.getElementsByTagName('refnamediv'):
                     for ref in node.getElementsByTagName('refname'):
                         outfiles.append(__get_xml_text(ref)+'.'+volnum)
-                        
+
             except:
-                # Use simple regex parsing 
-                f = open(__ensure_suffix(str(s),'.xml'), 'r')
-                content = f.read()
-                f.close()
-                
+                # Use simple regex parsing
+                with open(__ensure_suffix(str(s),'.xml'), 'r') as f:
+                    content = f.read()
+
                 for m in re_manvolnum.finditer(content):
                     volnum = m.group(1)
-                    
+
                 for m in re_refname.finditer(content):
                     outfiles.append(m.group(1)+'.'+volnum)
-            
+
             if not outfiles:
                 # Use stem of the source file
                 spath = str(s)
@@ -722,14 +718,14 @@ def DocbookMan(env, target, source=None, *args, **kw):
         else:
             # We have to completely rely on the given target name
             outfiles.append(t)
-            
+
         __builder.__call__(env, outfiles[0], s, **kw)
         env.Depends(outfiles[0], kw['DOCBOOK_XSL'])
         result.append(outfiles[0])
         if len(outfiles) > 1:
             env.Clean(outfiles[0], outfiles[1:])
 
-        
+
     return result
 
 def DocbookSlidesPdf(env, target, source=None, *args, **kw):
@@ -750,7 +746,7 @@ def DocbookSlidesPdf(env, target, source=None, *args, **kw):
     for t,s in zip(target,source):
         t, stem = __ensure_suffix_stem(t, '.pdf')
         xsl = __builder.__call__(env, stem+'.fo', s, **kw)
-        env.Depends(xsl, kw['DOCBOOK_XSL'])        
+        env.Depends(xsl, kw['DOCBOOK_XSL'])
         result.extend(xsl)
         result.extend(__fop_builder.__call__(env, t, xsl, **kw))
 
@@ -767,7 +763,7 @@ def DocbookSlidesHtml(env, target, source=None, *args, **kw):
         source = target
         target = ['index.html']
     elif not SCons.Util.is_List(source):
-        source = [source]    
+        source = [source]
 
     # Init XSL stylesheet
     __init_xsl_stylesheet(kw, env, '$DOCBOOK_DEFAULT_XSL_SLIDESHTML', ['slides','html','plain.xsl'])
@@ -800,12 +796,12 @@ def DocbookXInclude(env, target, source, *args, **kw):
 
     # Setup builder
     __builder = __select_builder(__xinclude_lxml_builder,__xinclude_libxml2_builder,__xmllint_builder)
-            
+
     # Create targets
     result = []
     for t,s in zip(target,source):
         result.extend(__builder.__call__(env, t, s, **kw))
-        
+
     return result
 
 def DocbookXslt(env, target, source=None, *args, **kw):
@@ -814,13 +810,13 @@ def DocbookXslt(env, target, source=None, *args, **kw):
     """
     # Init list of targets/sources
     target, source = __extend_targets_sources(target, source)
-    
+
     # Init XSL stylesheet
     kw['DOCBOOK_XSL'] = kw.get('xsl', 'transform.xsl')
 
     # Setup builder
     __builder = __select_builder(__lxml_builder, __libxml2_builder, __xsltproc_builder)
-    
+
     # Create targets
     result = []
     for t,s in zip(target,source):
@@ -844,18 +840,18 @@ def generate(env):
         DOCBOOK_DEFAULT_XSL_MAN = '',
         DOCBOOK_DEFAULT_XSL_SLIDESPDF = '',
         DOCBOOK_DEFAULT_XSL_SLIDESHTML = '',
-        
+
         # Paths to the detected executables
         DOCBOOK_XSLTPROC = '',
         DOCBOOK_XMLLINT = '',
         DOCBOOK_FOP = '',
-        
+
         # Additional flags for the text processors
         DOCBOOK_XSLTPROCFLAGS = SCons.Util.CLVar(''),
         DOCBOOK_XMLLINTFLAGS = SCons.Util.CLVar(''),
         DOCBOOK_FOPFLAGS = SCons.Util.CLVar(''),
         DOCBOOK_XSLTPROCPARAMS = SCons.Util.CLVar(''),
-        
+
         # Default command lines for the detected executables
         DOCBOOK_XSLTPROCCOM = xsltproc_com['xsltproc'],
         DOCBOOK_XMLLINTCOM = xmllint_com['xmllint'],
@@ -865,7 +861,7 @@ def generate(env):
         DOCBOOK_XSLTPROCCOMSTR = None,
         DOCBOOK_XMLLINTCOMSTR = None,
         DOCBOOK_FOPCOMSTR = None,
-        
+
         )
     _detect(env)
 
diff --git a/engine/SCons/Tool/dvi.py b/engine/SCons/Tool/dvi.py
index 7fbca27..5cd85ed 100644
--- a/engine/SCons/Tool/dvi.py
+++ b/engine/SCons/Tool/dvi.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/dvi.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Builder
 import SCons.Tool
diff --git a/engine/SCons/Tool/dvipdf.py b/engine/SCons/Tool/dvipdf.py
index 340929e..32f57e6 100644
--- a/engine/SCons/Tool/dvipdf.py
+++ b/engine/SCons/Tool/dvipdf.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/dvipdf.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Defaults
diff --git a/engine/SCons/Tool/dvips.py b/engine/SCons/Tool/dvips.py
index 16d409d..988ecd3 100644
--- a/engine/SCons/Tool/dvips.py
+++ b/engine/SCons/Tool/dvips.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/dvips.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Builder
diff --git a/engine/SCons/Tool/f03.py b/engine/SCons/Tool/f03.py
index dddc650..541ec88 100644
--- a/engine/SCons/Tool/f03.py
+++ b/engine/SCons/Tool/f03.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/f03.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/f08.py b/engine/SCons/Tool/f08.py
index c5209e4..5dc49da 100644
--- a/engine/SCons/Tool/f08.py
+++ b/engine/SCons/Tool/f08.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/f08.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/f77.py b/engine/SCons/Tool/f77.py
index 2665867..6d60edf 100644
--- a/engine/SCons/Tool/f77.py
+++ b/engine/SCons/Tool/f77.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/f77.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Scanner.Fortran
diff --git a/engine/SCons/Tool/f90.py b/engine/SCons/Tool/f90.py
index a6f5cff..e0b5fae 100644
--- a/engine/SCons/Tool/f90.py
+++ b/engine/SCons/Tool/f90.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/f90.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Scanner.Fortran
diff --git a/engine/SCons/Tool/f95.py b/engine/SCons/Tool/f95.py
index 3e611e8..9a1afdf 100644
--- a/engine/SCons/Tool/f95.py
+++ b/engine/SCons/Tool/f95.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/f95.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/filesystem.py b/engine/SCons/Tool/filesystem.py
index 312f08c..a625714 100644
--- a/engine/SCons/Tool/filesystem.py
+++ b/engine/SCons/Tool/filesystem.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/filesystem.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons
 from SCons.Tool.install import copyFunc
diff --git a/engine/SCons/Tool/fortran.py b/engine/SCons/Tool/fortran.py
index b57a845..1b09880 100644
--- a/engine/SCons/Tool/fortran.py
+++ b/engine/SCons/Tool/fortran.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/fortran.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import re
 
diff --git a/engine/SCons/Tool/g++.py b/engine/SCons/Tool/g++.py
index b28e39d..8cf881f 100644
--- a/engine/SCons/Tool/g++.py
+++ b/engine/SCons/Tool/g++.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/g++.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 
 #forward proxy to the preffered cxx version
diff --git a/engine/SCons/Tool/g77.py b/engine/SCons/Tool/g77.py
index 1c1f101..fc0bcba 100644
--- a/engine/SCons/Tool/g77.py
+++ b/engine/SCons/Tool/g77.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/g77.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 from SCons.Tool.FortranCommon import add_all_to_env, add_f77_to_env
diff --git a/engine/SCons/Tool/gas.py b/engine/SCons/Tool/gas.py
index 5ad8a76..c104e34 100644
--- a/engine/SCons/Tool/gas.py
+++ b/engine/SCons/Tool/gas.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gas.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 try:
     as_module = __import__('as', globals(), locals(), [])
diff --git a/engine/SCons/Tool/gcc.py b/engine/SCons/Tool/gcc.py
index 880fc80..2532427 100644
--- a/engine/SCons/Tool/gcc.py
+++ b/engine/SCons/Tool/gcc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gcc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from . import cc
 import os
diff --git a/engine/SCons/Tool/gdc.py b/engine/SCons/Tool/gdc.py
index 2e5f03b..46a910c 100644
--- a/engine/SCons/Tool/gdc.py
+++ b/engine/SCons/Tool/gdc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gdc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Defaults
diff --git a/engine/SCons/Tool/gettext_tool.py b/engine/SCons/Tool/gettext_tool.py
index 504ec46..5fc0158 100644
--- a/engine/SCons/Tool/gettext_tool.py
+++ b/engine/SCons/Tool/gettext_tool.py
@@ -23,7 +23,7 @@
 # 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/gettext_tool.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gettext_tool.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 #############################################################################
 def generate(env,**kw):
diff --git a/engine/SCons/Tool/gfortran.py b/engine/SCons/Tool/gfortran.py
index e543efd..8d02daa 100644
--- a/engine/SCons/Tool/gfortran.py
+++ b/engine/SCons/Tool/gfortran.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gfortran.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/gnulink.py b/engine/SCons/Tool/gnulink.py
index cf8a65d..53f5081 100644
--- a/engine/SCons/Tool/gnulink.py
+++ b/engine/SCons/Tool/gnulink.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gnulink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 import SCons.Tool
diff --git a/engine/SCons/Tool/gs.py b/engine/SCons/Tool/gs.py
index a1e0bd9..371b810 100644
--- a/engine/SCons/Tool/gs.py
+++ b/engine/SCons/Tool/gs.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gs.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Builder
diff --git a/engine/SCons/Tool/gxx.py b/engine/SCons/Tool/gxx.py
index b98ae07..d956c9f 100644
--- a/engine/SCons/Tool/gxx.py
+++ b/engine/SCons/Tool/gxx.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/gxx.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import re
diff --git a/engine/SCons/Tool/hpc++.py b/engine/SCons/Tool/hpc++.py
index 5cbe20e..4ec2fe3 100644
--- a/engine/SCons/Tool/hpc++.py
+++ b/engine/SCons/Tool/hpc++.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/hpc++.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 
 #forward proxy to the preffered cxx version
diff --git a/engine/SCons/Tool/hpcc.py b/engine/SCons/Tool/hpcc.py
index 27bdfa6..6a564b9 100644
--- a/engine/SCons/Tool/hpcc.py
+++ b/engine/SCons/Tool/hpcc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/hpcc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/hpcxx.py b/engine/SCons/Tool/hpcxx.py
index 6bfb600..8ee888f 100644
--- a/engine/SCons/Tool/hpcxx.py
+++ b/engine/SCons/Tool/hpcxx.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/hpcxx.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
@@ -68,7 +68,8 @@ def generate(env):
         env['CXX']        = acc or 'aCC'
         env['SHCXXFLAGS'] = SCons.Util.CLVar('$CXXFLAGS +Z')
         # determine version of aCC
-        line = os.popen(acc + ' -V 2>&1').readline().rstrip()
+        with os.popen(acc + ' -V 2>&1') as p:
+            line = p.readline().rstrip()
         if line.find('aCC: HP ANSI C++') == 0:
             env['CXXVERSION'] = line.split()[-1]
 
diff --git a/engine/SCons/Tool/hplink.py b/engine/SCons/Tool/hplink.py
index 502b945..1afa95e 100644
--- a/engine/SCons/Tool/hplink.py
+++ b/engine/SCons/Tool/hplink.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/hplink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
diff --git a/engine/SCons/Tool/icc.py b/engine/SCons/Tool/icc.py
index f16e79a..8110a60 100644
--- a/engine/SCons/Tool/icc.py
+++ b/engine/SCons/Tool/icc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/icc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from . import cc
 
diff --git a/engine/SCons/Tool/icl.py b/engine/SCons/Tool/icl.py
index 7a7b21b..29d5862 100644
--- a/engine/SCons/Tool/icl.py
+++ b/engine/SCons/Tool/icl.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/icl.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Tool.intelc
 
diff --git a/engine/SCons/Tool/ifl.py b/engine/SCons/Tool/ifl.py
index d351e4e..0eb7cda 100644
--- a/engine/SCons/Tool/ifl.py
+++ b/engine/SCons/Tool/ifl.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/ifl.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 from SCons.Scanner.Fortran import FortranScan
diff --git a/engine/SCons/Tool/ifort.py b/engine/SCons/Tool/ifort.py
index 7a3128e..730e778 100644
--- a/engine/SCons/Tool/ifort.py
+++ b/engine/SCons/Tool/ifort.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/ifort.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 from SCons.Scanner.Fortran import FortranScan
diff --git a/engine/SCons/Tool/ilink.py b/engine/SCons/Tool/ilink.py
index c27443a..7c69e72 100644
--- a/engine/SCons/Tool/ilink.py
+++ b/engine/SCons/Tool/ilink.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/ilink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/ilink32.py b/engine/SCons/Tool/ilink32.py
index 69430ec..a1e12a6 100644
--- a/engine/SCons/Tool/ilink32.py
+++ b/engine/SCons/Tool/ilink32.py
@@ -27,7 +27,7 @@ XXX
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/ilink32.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/ilink32.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Tool
 import SCons.Tool.bcc32
diff --git a/engine/SCons/Tool/install.py b/engine/SCons/Tool/install.py
index c388b2a..c0a8917 100644
--- a/engine/SCons/Tool/install.py
+++ b/engine/SCons/Tool/install.py
@@ -31,7 +31,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/install.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/install.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import re
diff --git a/engine/SCons/Tool/intelc.py b/engine/SCons/Tool/intelc.py
index 63df411..fdd9730 100644
--- a/engine/SCons/Tool/intelc.py
+++ b/engine/SCons/Tool/intelc.py
@@ -32,12 +32,12 @@ 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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/intelc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import math, sys, os.path, glob, string, re
 
 is_windows = sys.platform == 'win32'
-is_win64 = is_windows and (os.environ['PROCESSOR_ARCHITECTURE'] == 'AMD64' or 
+is_win64 = is_windows and (os.environ['PROCESSOR_ARCHITECTURE'] == 'AMD64' or
                            ('PROCESSOR_ARCHITEW6432' in os.environ and
                             os.environ['PROCESSOR_ARCHITEW6432'] == 'AMD64'))
 is_linux = sys.platform.startswith('linux')
@@ -113,11 +113,6 @@ def check_abi(abi):
               (abi, list(valid_abis.keys())))
     return abi
 
-def vercmp(a, b):
-    """Compare strings as floats,
-    but Intel changed Linux naming convention at 9.0"""
-    return cmp(linux_ver_normalize(b), linux_ver_normalize(a))
-
 def get_version_from_list(v, vlist):
     """See if we can match v (string) in vlist (list of strings)
     Linux has to match in a fuzzy way."""
@@ -221,7 +216,7 @@ def get_all_compiler_versions():
         versions = []
         try:
             while i < 100:
-                subkey = SCons.Util.RegEnumKey(k, i) # raises EnvironmentError
+                subkey = SCons.Util.RegEnumKey(k, i) # raises SConsEnvironmentError
                 # Check that this refers to an existing dir.
                 # This is not 100% perfect but should catch common
                 # installation issues like when the compiler was installed
@@ -293,7 +288,7 @@ def get_all_compiler_versions():
             m = re.search(r'([0-9]{0,4})(?:_sp\d*)?\.([0-9][0-9.]*)$', d)
             if m:
                 versions.append("%s.%s"%(m.group(1), m.group(2)))
-            
+
     def keyfunc(str):
         """Given a dot-separated version string, return a tuple of ints representing it."""
         return [int(x) for x in str.split('.')]
@@ -383,7 +378,7 @@ def get_intel_compiler_top(version, abi):
                     top = d
                     break
             return top
-                    
+
         top = find_in_2016style_dir(version) or find_in_2011style_dir(version) or find_in_2010style_dir(version) or find_in_2008style_dir(version)
         # print "INTELC: top=",top
         if not top:
diff --git a/engine/SCons/Tool/ipkg.py b/engine/SCons/Tool/ipkg.py
index 0027781..664c3a6 100644
--- a/engine/SCons/Tool/ipkg.py
+++ b/engine/SCons/Tool/ipkg.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/ipkg.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 
@@ -55,8 +55,10 @@ def generate(env):
     env['IPKGCOM'] = '$IPKG $IPKGFLAGS ${SOURCE}'
 
     if env.WhereIs('id'):
-        env['IPKGUSER'] = os.popen('id -un').read().strip()
-        env['IPKGGROUP'] = os.popen('id -gn').read().strip()
+        with os.popen('id -un') as p:
+            env['IPKGUSER'] = p.read().strip()
+        with os.popen('id -gn') as p:
+            env['IPKGGROUP'] = p.read().strip()
     env['IPKGFLAGS'] = SCons.Util.CLVar('-o $IPKGUSER -g $IPKGGROUP')
     env['IPKGSUFFIX'] = '.ipk'
 
diff --git a/engine/SCons/Tool/jar.py b/engine/SCons/Tool/jar.py
index 4d686af..98be08f 100644
--- a/engine/SCons/Tool/jar.py
+++ b/engine/SCons/Tool/jar.py
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/jar.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/jar.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 import os
 
 import SCons.Subst
@@ -86,7 +86,7 @@ def jarFlags(target, source, env, for_signature):
     for src in source:
         contents = src.get_text_contents()
         if contents.startswith("Manifest-Version"):
-            if not 'm' in jarflags:
+            if 'm' not in jarflags:
                 return jarflags + 'm'
             break
     return jarflags
@@ -106,7 +106,7 @@ def Jar(env, target = None, source = [], *args, **kw):
         source = target
         target = None
 
-    # mutiple targets pass so build each target the same from the 
+    # 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?
@@ -184,7 +184,7 @@ def Jar(env, target = None, source = [], *args, **kw):
                 continue
             except:
                 pass
-            
+
             try:
                 # source is string try to covnert it to dir
                 target_nodes.extend(dir_to_class(env.fs.Dir(s)))
@@ -193,7 +193,7 @@ def Jar(env, target = None, source = [], *args, **kw):
                 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)
@@ -209,9 +209,9 @@ def generate(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']))
+        # Ensure that we have a proper path for jar
+        paths = get_java_install_dirs('win32')
+        jar = SCons.Tool.find_program_path(env, 'jar', default_paths=paths)
         if jar:
             jar_bin_dir = os.path.dirname(jar)
             env.AppendENVPath('PATH', jar_bin_dir)
diff --git a/engine/SCons/Tool/javac.py b/engine/SCons/Tool/javac.py
index a295bfe..387afdb 100644
--- a/engine/SCons/Tool/javac.py
+++ b/engine/SCons/Tool/javac.py
@@ -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/javac.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/javac.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
@@ -210,15 +210,15 @@ def generate(env):
 
     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)
+        paths = get_java_install_dirs('win32', 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)
+    else:
+        javac = SCons.Tool.find_program_path(env, 'javac')
 
     env['JAVAINCLUDES'] = get_java_include_paths(env, javac, version)
 
diff --git a/engine/SCons/Tool/javah.py b/engine/SCons/Tool/javah.py
index 791c7ab..251778d 100644
--- a/engine/SCons/Tool/javah.py
+++ b/engine/SCons/Tool/javah.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/javah.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
@@ -123,9 +123,9 @@ def generate(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']))
+        # Ensure that we have a proper path for javah
+        paths = get_java_install_dirs('win32')
+        javah = SCons.Tool.find_program_path(env, 'javah', default_paths=paths)
         if javah:
             javah_bin_dir = os.path.dirname(javah)
             env.AppendENVPath('PATH', javah_bin_dir)
diff --git a/engine/SCons/Tool/latex.py b/engine/SCons/Tool/latex.py
index 008a98a..3f1af08 100644
--- a/engine/SCons/Tool/latex.py
+++ b/engine/SCons/Tool/latex.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/latex.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Defaults
diff --git a/engine/SCons/Tool/ldc.py b/engine/SCons/Tool/ldc.py
index c2e9a8f..dda1a5e 100644
--- a/engine/SCons/Tool/ldc.py
+++ b/engine/SCons/Tool/ldc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/ldc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import subprocess
diff --git a/engine/SCons/Tool/lex.py b/engine/SCons/Tool/lex.py
index fc6322f..4831776 100644
--- a/engine/SCons/Tool/lex.py
+++ b/engine/SCons/Tool/lex.py
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/lex.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/lex.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import sys
@@ -45,6 +45,11 @@ from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
 
 LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
 
+if sys.platform == 'win32':
+    BINS = ['flex', 'lex', 'win_flex']
+else:
+    BINS = ["flex", "lex"]
+
 def lexEmitter(target, source, env):
     sourceBase, sourceExt = os.path.splitext(SCons.Util.to_String(source[0]))
 
@@ -70,22 +75,22 @@ def lexEmitter(target, source, env):
 
 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']
+    Find the path to the lex tool, searching several possible names
 
-    for prog in bins:
+    Only called in the Windows case, so the default_path
+    can be Windows-specific
+
+    :param env: current construction environment
+    :param append_paths: if set, add the path to the tool to PATH
+    :return: path to lex tool, if found
+    """
+    for prog in BINS:
         bin_path = SCons.Tool.find_program_path(
-            env, 
-            prog, 
+            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:
+            if append_paths:
                 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')
@@ -113,20 +118,21 @@ def generate(env):
     env["LEXFLAGS"] = SCons.Util.CLVar("")
 
     if sys.platform == 'win32':
-        get_lex_path(env, append_paths=True)
-        env["LEX"] = env.Detect(['flex', 'lex', 'win_flex'])
+        # ignore the return - we do not need the full path here
+        _ = get_lex_path(env, append_paths=True)
+        env["LEX"] = env.Detect(BINS)
         if not env.get("LEXUNISTD"):
             env["LEXUNISTD"] = SCons.Util.CLVar("")
         env["LEXCOM"] = "$LEX $LEXUNISTD $LEXFLAGS -t $SOURCES > $TARGET"
     else:
-        env["LEX"] = env.Detect(["flex", "lex"])
+        env["LEX"] = env.Detect(BINS)
         env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
 
 def exists(env):
     if sys.platform == 'win32':
         return get_lex_path(env)
     else:
-        return env.Detect(["flex", "lex"])
+        return env.Detect(BINS)
 
 # Local Variables:
 # tab-width:4
diff --git a/engine/SCons/Tool/link.py b/engine/SCons/Tool/link.py
index 95a00cc..dcaf91f 100644
--- a/engine/SCons/Tool/link.py
+++ b/engine/SCons/Tool/link.py
@@ -32,7 +32,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/link.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/link.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import sys
 import re
diff --git a/engine/SCons/Tool/linkloc.py b/engine/SCons/Tool/linkloc.py
index 42c180e..42d010d 100644
--- a/engine/SCons/Tool/linkloc.py
+++ b/engine/SCons/Tool/linkloc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/linkloc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import re
diff --git a/engine/SCons/Tool/m4.py b/engine/SCons/Tool/m4.py
index bb27b53..0ecc82a 100644
--- a/engine/SCons/Tool/m4.py
+++ b/engine/SCons/Tool/m4.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/m4.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Builder
diff --git a/engine/SCons/Tool/masm.py b/engine/SCons/Tool/masm.py
index 092f5dc..cf147a7 100644
--- a/engine/SCons/Tool/masm.py
+++ b/engine/SCons/Tool/masm.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/masm.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/midl.py b/engine/SCons/Tool/midl.py
index 2dfd347..f75204a 100644
--- a/engine/SCons/Tool/midl.py
+++ b/engine/SCons/Tool/midl.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/midl.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Builder
diff --git a/engine/SCons/Tool/mingw.py b/engine/SCons/Tool/mingw.py
index cb9bc3c..8410d2f 100644
--- a/engine/SCons/Tool/mingw.py
+++ b/engine/SCons/Tool/mingw.py
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mingw.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/mingw.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
@@ -65,7 +65,7 @@ def shlib_generator(target, source, env, 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: \
+    if insert_def not in ['', '0', 0] and def_target: \
             cmd.append('-Wl,--output-def,' + def_target.get_string(for_signature))
 
     return [cmd]
@@ -123,7 +123,7 @@ key_program = 'mingw32-make'
 
 
 def find_version_specific_mingw_paths():
-    """
+    r"""
     One example of default mingw install paths is:
     C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev2\mingw64\bin
 
diff --git a/engine/SCons/Tool/msgfmt.py b/engine/SCons/Tool/msgfmt.py
index 3a73abd..c8141a0 100644
--- a/engine/SCons/Tool/msgfmt.py
+++ b/engine/SCons/Tool/msgfmt.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/msgfmt.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Builder import BuilderBase
 #############################################################################
diff --git a/engine/SCons/Tool/msginit.py b/engine/SCons/Tool/msginit.py
index 5b3dc0b..69e803a 100644
--- a/engine/SCons/Tool/msginit.py
+++ b/engine/SCons/Tool/msginit.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/msginit.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Warnings
 import SCons.Builder
diff --git a/engine/SCons/Tool/msgmerge.py b/engine/SCons/Tool/msgmerge.py
index c8b7688..4254fa6 100644
--- a/engine/SCons/Tool/msgmerge.py
+++ b/engine/SCons/Tool/msgmerge.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/msgmerge.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 #############################################################################
 def _update_or_init_po_files(target, source, env):
diff --git a/engine/SCons/Tool/mslib.py b/engine/SCons/Tool/mslib.py
index 1434773..cecdbdc 100644
--- a/engine/SCons/Tool/mslib.py
+++ b/engine/SCons/Tool/mslib.py
@@ -31,7 +31,9 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mslib.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/mslib.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
+
+import os
 
 import SCons.Defaults
 import SCons.Tool
@@ -54,6 +56,13 @@ def generate(env):
     env['LIBPREFIX']   = ''
     env['LIBSUFFIX']   = '.lib'
 
+    # Issue #3350
+    # Change tempfile argument joining character from a space to a newline
+    # mslink will fail if any single line is too long, but is fine with many lines
+    # in a tempfile
+    env['TEMPFILEARGJOIN'] = os.linesep
+
+
 def exists(env):
     return msvc_exists(env)
 
diff --git a/engine/SCons/Tool/mslink.py b/engine/SCons/Tool/mslink.py
index 9fd84c7..9fbce4b 100644
--- a/engine/SCons/Tool/mslink.py
+++ b/engine/SCons/Tool/mslink.py
@@ -32,8 +32,9 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/mslink.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/mslink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
+import os
 import os.path
 
 import SCons.Action
@@ -107,7 +108,7 @@ def _dllEmitter(target, source, env, paramtp):
         raise SCons.Errors.UserError('A shared library should have exactly one target with the suffix: %s' % env.subst('$%sSUFFIX' % paramtp))
 
     insert_def = env.subst("$WINDOWS_INSERT_DEF")
-    if not insert_def in ['', '0', 0] and \
+    if insert_def not in ['', '0', 0] and \
        not env.FindIxes(source, "WINDOWSDEFPREFIX", "WINDOWSDEFSUFFIX"):
 
         # append a def file to the list of sources
@@ -158,7 +159,7 @@ def windowsLibEmitter(target, source, env):
 
 def ldmodEmitter(target, source, env):
     """Emitter for loadable modules.
-    
+
     Loadable modules are identical to shared libraries on Windows, but building
     them is subject to different parameters (LDMODULE*).
     """
@@ -219,7 +220,7 @@ def embedManifestDllCheck(target, source, env):
     if env.get('WINDOWS_EMBED_MANIFEST', 0):
         manifestSrc = target[0].get_abspath() + '.manifest'
         if os.path.exists(manifestSrc):
-            ret = (embedManifestDllAction) ([target[0]],None,env)        
+            ret = (embedManifestDllAction) ([target[0]],None,env)
             if ret:
                 raise SCons.Errors.UserError("Unable to embed manifest into %s" % (target[0]))
             return ret
@@ -327,6 +328,12 @@ def generate(env):
     env['LDMODULEEMITTER'] = [ldmodEmitter]
     env['LDMODULECOM'] = compositeLdmodAction
 
+    # Issue #3350
+    # Change tempfile argument joining character from a space to a newline
+    # mslink will fail if any single line is too long, but is fine with many lines
+    # in a tempfile
+    env['TEMPFILEARGJOIN'] = os.linesep
+
 def exists(env):
     return msvc_exists(env)
 
diff --git a/engine/SCons/Tool/mssdk.py b/engine/SCons/Tool/mssdk.py
index 1372e87..7a38c6a 100644
--- a/engine/SCons/Tool/mssdk.py
+++ b/engine/SCons/Tool/mssdk.py
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/mssdk.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/mssdk.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 """engine.SCons.Tool.mssdk
 
diff --git a/engine/SCons/Tool/msvc.py b/engine/SCons/Tool/msvc.py
index 4649963..052a0b0 100644
--- a/engine/SCons/Tool/msvc.py
+++ b/engine/SCons/Tool/msvc.py
@@ -31,9 +31,10 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/msvc.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/msvc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
+import os
 import re
 import sys
 
@@ -161,7 +162,7 @@ def msvc_batch_key(action, env, target, source):
     # Note we need to do the env.subst so $MSVC_BATCH can be a reference to
     # another construction variable, which is why we test for False and 0
     # as strings.
-    if not 'MSVC_BATCH' in env or env.subst('$MSVC_BATCH') in ('0', 'False', '', None):
+    if 'MSVC_BATCH' not in env or env.subst('$MSVC_BATCH') in ('0', 'False', '', None):
         # We're not using batching; return no key.
         return None
     t = target[0]
@@ -187,7 +188,7 @@ def msvc_output_flag(target, source, env, for_signature):
     # len(source)==1 as batch mode can compile only one file
     # (and it also fixed problem with compiling only one changed file
     # with batch mode enabled)
-    if not 'MSVC_BATCH' in env or env.subst('$MSVC_BATCH') in ('0', 'False', '', None):
+    if 'MSVC_BATCH' not in env or env.subst('$MSVC_BATCH') in ('0', 'False', '', None):
         return '/Fo$TARGET'
     else:
         # The Visual C/C++ compiler requires a \ at the end of the /Fo
@@ -283,6 +284,12 @@ def generate(env):
 
     msvc_set_PCHPDBFLAGS(env)
 
+    # Issue #3350
+    # Change tempfile argument joining character from a space to a newline
+    # mslink will fail if any single line is too long, but is fine with many lines
+    # in a tempfile
+    env['TEMPFILEARGJOIN'] = os.linesep
+
 
     env['PCHCOM'] = '$CXX /Fo${TARGETS[1]} $CXXFLAGS $CCFLAGS $CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS /c $SOURCES /Yc$PCHSTOP /Fp${TARGETS[0]} $CCPDBFLAGS $PCHPDBFLAGS'
     env['BUILDERS']['PCH'] = pch_builder
diff --git a/engine/SCons/Tool/msvs.py b/engine/SCons/Tool/msvs.py
index afe4bef..38965e3 100644
--- a/engine/SCons/Tool/msvs.py
+++ b/engine/SCons/Tool/msvs.py
@@ -32,7 +32,7 @@ selection method.
 
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/msvs.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/msvs.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.compat
 
@@ -70,10 +70,14 @@ def xmlify(s):
     s = s.replace('\n', '&#x0A;')
     return s
 
-# Process a CPPPATH list in includes, given the env, target and source.
-# Returns a tuple of nodes.
 def processIncludes(includes, env, target, source):
-    return SCons.PathList.PathList(includes).subst_path(env, target, source)
+    """
+    Process a CPPPATH list in includes, given the env, target and source.
+    Returns a list of directory paths. These paths are absolute so we avoid
+    putting pound-prefixed paths in a Visual Studio project file.
+    """
+    return [env.Dir(i).abspath for i in
+            SCons.PathList.PathList(includes).subst_path(env, target, source)]
 
 
 external_makefile_guid = '{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}'
@@ -348,10 +352,20 @@ V10DebugSettings = {
 }
 
 class _GenerateV10User(_UserGenerator):
-    """Generates a Project'user file for MSVS 2010"""
+    """Generates a Project'user file for MSVS 2010 or later"""
 
     def __init__(self, dspfile, source, env):
-        self.versionstr = '4.0'
+        version_num, suite = msvs_parse_version(env['MSVS_VERSION'])
+        if version_num >= 14.2:
+            # Visual Studio 2019 is considered to be version 16.
+            self.versionstr = '16.0'
+        elif version_num >= 14.1:
+            # Visual Studio 2017 is considered to be version 15.
+            self.versionstr = '15.0'
+        elif version_num == 14.0:
+            self.versionstr = '14.0'
+        else:
+            self.versionstr = '4.0'
         self.usrhead = V10UserHeader
         self.usrconf = V10UserConfiguration
         self.usrdebg = V10DebugSettings
@@ -397,7 +411,7 @@ class _DSPGenerator(object):
         elif SCons.Util.is_List(env['variant']):
             variants = env['variant']
 
-        if 'buildtarget' not in env or env['buildtarget'] == None:
+        if 'buildtarget' not in env or env['buildtarget'] is None:
             buildtarget = ['']
         elif SCons.Util.is_String(env['buildtarget']):
             buildtarget = [env['buildtarget']]
@@ -418,7 +432,7 @@ class _DSPGenerator(object):
             for _ in variants:
                 buildtarget.append(bt)
 
-        if 'outdir' not in env or env['outdir'] == None:
+        if 'outdir' not in env or env['outdir'] is None:
             outdir = ['']
         elif SCons.Util.is_String(env['outdir']):
             outdir = [env['outdir']]
@@ -439,7 +453,7 @@ class _DSPGenerator(object):
             for v in variants:
                 outdir.append(s)
 
-        if 'runfile' not in env or env['runfile'] == None:
+        if 'runfile' not in env or env['runfile'] is None:
             runfile = buildtarget[-1:]
         elif SCons.Util.is_String(env['runfile']):
             runfile = [env['runfile']]
@@ -462,15 +476,41 @@ class _DSPGenerator(object):
 
         self.sconscript = env['MSVSSCONSCRIPT']
 
-        if 'cmdargs' not in env or env['cmdargs'] == None:
-            cmdargs = [''] * len(variants)
-        elif SCons.Util.is_String(env['cmdargs']):
-            cmdargs = [env['cmdargs']] * len(variants)
-        elif SCons.Util.is_List(env['cmdargs']):
-            if len(env['cmdargs']) != len(variants):
-                raise SCons.Errors.InternalError("Sizes of 'cmdargs' and 'variant' lists must be the same.")
+        def GetKeyFromEnv(env, key, variants):
+            """
+            Retrieves a specific key from the environment. If the key is
+            present, it is expected to either be a string or a list with length
+            equal to the number of variants. The function returns a list of
+            the desired value (e.g. cpp include paths) guaranteed to be of
+            length equal to the length of the variants list.
+            """
+            if key not in env or env[key] is None:
+                return [''] * len(variants)
+            elif SCons.Util.is_String(env[key]):
+                return [env[key]] * len(variants)
+            elif SCons.Util.is_List(env[key]):
+                if len(env[key]) != len(variants):
+                    raise SCons.Errors.InternalError("Sizes of '%s' and 'variant' lists must be the same." % key)
+                else:
+                    return env[key]
             else:
-                cmdargs = env['cmdargs']
+                raise SCons.Errors.InternalError("Unsupported type for key '%s' in environment: %s" %
+                                                 (key, type(env[key])))
+
+        cmdargs = GetKeyFromEnv(env, 'cmdargs', variants)
+
+        # The caller is allowed to put 'cppdefines' and/or 'cpppaths' in the
+        # environment, which is useful if they want to provide per-variant
+        # values for these. Otherwise, we fall back to using the global
+        # 'CPPDEFINES' and 'CPPPATH' functions.
+        if 'cppdefines' in env:
+            cppdefines = GetKeyFromEnv(env, 'cppdefines', variants)
+        else:
+            cppdefines = [env.get('CPPDEFINES', [])] * len(variants)
+        if 'cpppaths' in env:
+            cpppaths = GetKeyFromEnv(env, 'cpppaths', variants)
+        else:
+            cpppaths = [env.get('CPPPATH', [])] * len(variants)
 
         self.env = env
 
@@ -513,13 +553,17 @@ class _DSPGenerator(object):
         for n in sourcenames:
             self.sources[n].sort(key=lambda a: a.lower())
 
-        def AddConfig(self, variant, buildtarget, outdir, runfile, cmdargs, dspfile=dspfile):
+        def AddConfig(self, variant, buildtarget, outdir, runfile, cmdargs, cppdefines, cpppaths, dspfile=dspfile, env=env):
             config = Config()
             config.buildtarget = buildtarget
             config.outdir = outdir
             config.cmdargs = cmdargs
+            config.cppdefines = cppdefines
             config.runfile = runfile
 
+            # Dir objects can't be pickled, so we need an absolute path here.
+            config.cpppaths = processIncludes(cpppaths, env, None, None)
+
             match = re.match(r'(.*)\|(.*)', variant)
             if match:
                 config.variant = match.group(1)
@@ -532,12 +576,12 @@ class _DSPGenerator(object):
             print("Adding '" + self.name + ' - ' + config.variant + '|' + config.platform + "' to '" + str(dspfile) + "'")
 
         for i in range(len(variants)):
-            AddConfig(self, variants[i], buildtarget[i], outdir[i], runfile[i], cmdargs[i])
+            AddConfig(self, variants[i], buildtarget[i], outdir[i], runfile[i], cmdargs[i], cppdefines[i], cpppaths[i])
 
         self.platforms = []
         for key in list(self.configs.keys()):
             platform = self.configs[key].platform
-            if not platform in self.platforms:
+            if platform not in self.platforms:
                 self.platforms.append(platform)
 
     def Build(self):
@@ -553,16 +597,16 @@ V6DSPHeader = """\
 CFG=%(name)s - Win32 %(confkey)s
 !MESSAGE This is not a valid makefile. To build this project using NMAKE,
 !MESSAGE use the Export Makefile command and run
-!MESSAGE 
+!MESSAGE
 !MESSAGE NMAKE /f "%(name)s.mak".
-!MESSAGE 
+!MESSAGE
 !MESSAGE You can specify a configuration when running NMAKE
 !MESSAGE by defining the macro CFG on the command line. For example:
-!MESSAGE 
+!MESSAGE
 !MESSAGE NMAKE /f "%(name)s.mak" CFG="%(name)s - Win32 %(confkey)s"
-!MESSAGE 
+!MESSAGE
 !MESSAGE Possible choices for configuration are:
-!MESSAGE 
+!MESSAGE
 """
 
 class _GenerateV6DSP(_DSPGenerator):
@@ -580,7 +624,7 @@ class _GenerateV6DSP(_DSPGenerator):
         for kind in confkeys:
             self.file.write('!MESSAGE "%s - Win32 %s" (based on "Win32 (x86) External Target")\n' % (name, kind))
 
-        self.file.write('!MESSAGE \n\n')
+        self.file.write('!MESSAGE\n\n')
 
     def PrintProject(self):
         name = self.name
@@ -637,7 +681,7 @@ class _GenerateV6DSP(_DSPGenerator):
                 first = 1
             else:
                 self.file.write('!ELSEIF  "$(CFG)" == "%s - Win32 %s"\n\n' % (name,kind))
-        self.file.write('!ENDIF \n\n')
+        self.file.write('!ENDIF\n\n')
         self.PrintSourceFiles()
         self.file.write('# End Target\n'
                         '# End Project\n')
@@ -645,10 +689,10 @@ class _GenerateV6DSP(_DSPGenerator):
         if self.nokeep == 0:
             # now we pickle some data and add it to the file -- MSDEV will ignore it.
             pdata = pickle.dumps(self.configs,PICKLE_PROTOCOL)
-            pdata = base64.encodestring(pdata).decode()
+            pdata = base64.b64encode(pdata).decode()
             self.file.write(pdata + '\n')
             pdata = pickle.dumps(self.sources,PICKLE_PROTOCOL)
-            pdata = base64.encodestring(pdata).decode()
+            pdata = base64.b64encode(pdata).decode()
             self.file.write(pdata + '\n')
 
     def PrintSourceFiles(self):
@@ -685,11 +729,13 @@ class _GenerateV6DSP(_DSPGenerator):
             return # doesn't exist yet, so can't add anything to configs.
 
         line = dspfile.readline()
+        # skip until marker
         while line:
             if line.find("# End Project") > -1:
                 break
             line = dspfile.readline()
 
+        # read to get configs
         line = dspfile.readline()
         datas = line
         while line and line != '\n':
@@ -707,12 +753,14 @@ class _GenerateV6DSP(_DSPGenerator):
 
         self.configs.update(data)
 
+        # keep reading to get sources
         data = None
         line = dspfile.readline()
         datas = line
         while line and line != '\n':
             line = dspfile.readline()
             datas = datas + line
+        dspfile.close()
 
         # OK, we've found our little pickled cache of data.
         # it has a "# " in front of it, so we strip that.
@@ -878,6 +926,8 @@ class _GenerateV7DSP(_DSPGenerator, _GenerateV7User):
             buildtarget = self.configs[kind].buildtarget
             runfile     = self.configs[kind].runfile
             cmdargs = self.configs[kind].cmdargs
+            cpppaths = self.configs[kind].cpppaths
+            cppdefines = self.configs[kind].cppdefines
 
             env_has_buildtarget = 'MSVSBUILDTARGET' in self.env
             if not env_has_buildtarget:
@@ -895,9 +945,8 @@ class _GenerateV7DSP(_DSPGenerator, _GenerateV7User):
             # This isn't perfect; CPPDEFINES and CPPPATH can contain $TARGET and $SOURCE,
             # so they could vary depending on the command being generated.  This code
             # assumes they don't.
-            preprocdefs = xmlify(';'.join(processDefines(self.env.get('CPPDEFINES', []))))
-            includepath_Dirs = processIncludes(self.env.get('CPPPATH', []), self.env, None, None)
-            includepath = xmlify(';'.join([str(x) for x in includepath_Dirs]))
+            preprocdefs = xmlify(';'.join(processDefines(cppdefines)))
+            includepath = xmlify(';'.join(processIncludes(cpppaths, self.env, None, None)))
 
             if not env_has_buildtarget:
                 del self.env['MSVSBUILDTARGET']
@@ -917,10 +966,10 @@ class _GenerateV7DSP(_DSPGenerator, _GenerateV7User):
         if self.nokeep == 0:
             # now we pickle some data and add it to the file -- MSDEV will ignore it.
             pdata = pickle.dumps(self.configs,PICKLE_PROTOCOL)
-            pdata = base64.encodestring(pdata).decode()
+            pdata = base64.b64encode(pdata).decode()
             self.file.write('<!-- SCons Data:\n' + pdata + '\n')
             pdata = pickle.dumps(self.sources,PICKLE_PROTOCOL)
-            pdata = base64.encodestring(pdata).decode()
+            pdata = base64.b64encode(pdata).decode()
             self.file.write(pdata + '-->\n')
 
     def printSources(self, hierarchy, commonprefix):
@@ -998,11 +1047,13 @@ class _GenerateV7DSP(_DSPGenerator, _GenerateV7User):
             return # doesn't exist yet, so can't add anything to configs.
 
         line = dspfile.readline()
+        # skip until marker
         while line:
             if line.find('<!-- SCons Data:') > -1:
                 break
             line = dspfile.readline()
 
+        # read to get configs
         line = dspfile.readline()
         datas = line
         while line and line != '\n':
@@ -1020,12 +1071,14 @@ class _GenerateV7DSP(_DSPGenerator, _GenerateV7User):
 
         self.configs.update(data)
 
+        # keep reading to get sources
         data = None
         line = dspfile.readline()
         datas = line
         while line and line != '\n':
             line = dspfile.readline()
             datas = datas + line
+        dspfile.close()
 
         # OK, we've found our little pickled cache of data.
         try:
@@ -1052,7 +1105,7 @@ class _GenerateV7DSP(_DSPGenerator, _GenerateV7User):
 
 V10DSPHeader = """\
 <?xml version="1.0" encoding="%(encoding)s"?>
-<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="%(versionstr)s" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 """
 
 V10DSPProjectConfiguration = """\
@@ -1067,6 +1120,7 @@ V10DSPGlobals = """\
 \t\t<ProjectGuid>%(project_guid)s</ProjectGuid>
 %(scc_attrs)s\t\t<RootNamespace>%(name)s</RootNamespace>
 \t\t<Keyword>MakeFileProj</Keyword>
+\t\t<VCProjectUpgraderObjectName>NoUpgrade</VCProjectUpgraderObjectName>
 \t</PropertyGroup>
 """
 
@@ -1080,7 +1134,7 @@ V10DSPPropertyGroupCondition = """\
 
 V10DSPImportGroupCondition = """\
 \t<ImportGroup Condition="'$(Configuration)|$(Platform)'=='%(variant)s|%(platform)s'" Label="PropertySheets">
-\t\t<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+\t\t<Import Project="$(UserRootDir)\\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
 \t</ImportGroup>
 """
 
@@ -1104,9 +1158,9 @@ V15DSPHeader = """\
 class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
     """Generates a Project file for MSVS 2010"""
 
-    def __init__(self, dspfile, header, source, env):
+    def __init__(self, dspfile, source, env):
         _DSPGenerator.__init__(self, dspfile, source, env)
-        self.dspheader = header
+        self.dspheader = V10DSPHeader
         self.dspconfiguration = V10DSPProjectConfiguration
         self.dspglobals = V10DSPGlobals
 
@@ -1115,6 +1169,7 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
     def PrintHeader(self):
         env = self.env
         name = self.name
+        versionstr = self.versionstr
         encoding = env.subst('$MSVSENCODING')
         project_guid = env.get('MSVS_PROJECT_GUID', '')
         scc_provider = env.get('MSVS_SCC_PROVIDER', '')
@@ -1159,7 +1214,7 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
         name = self.name
         confkeys = sorted(self.configs.keys())
 
-        self.file.write('\t<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />\n')
+        self.file.write('\t<Import Project="$(VCTargetsPath)\\Microsoft.Cpp.Default.props" />\n')
 
         toolset = ''
         if 'MSVC_VERSION' in self.env:
@@ -1170,7 +1225,7 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
             platform = self.configs[kind].platform
             self.file.write(V10DSPPropertyGroupCondition % locals())
 
-        self.file.write('\t<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />\n')
+        self.file.write('\t<Import Project="$(VCTargetsPath)\\Microsoft.Cpp.props" />\n')
         self.file.write('\t<ImportGroup Label="ExtensionSettings">\n')
         self.file.write('\t</ImportGroup>\n')
 
@@ -1190,6 +1245,8 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
             buildtarget = self.configs[kind].buildtarget
             runfile     = self.configs[kind].runfile
             cmdargs = self.configs[kind].cmdargs
+            cpppaths = self.configs[kind].cpppaths
+            cppdefines = self.configs[kind].cppdefines
 
             env_has_buildtarget = 'MSVSBUILDTARGET' in self.env
             if not env_has_buildtarget:
@@ -1207,9 +1264,8 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
             # This isn't perfect; CPPDEFINES and CPPPATH can contain $TARGET and $SOURCE,
             # so they could vary depending on the command being generated.  This code
             # assumes they don't.
-            preprocdefs = xmlify(';'.join(processDefines(self.env.get('CPPDEFINES', []))))
-            includepath_Dirs = processIncludes(self.env.get('CPPPATH', []), self.env, None, None)
-            includepath = xmlify(';'.join([str(x) for x in includepath_Dirs]))
+            preprocdefs = xmlify(';'.join(processDefines(cppdefines)))
+            includepath = xmlify(';'.join(processIncludes(cpppaths, self.env, None, None)))
 
             if not env_has_buildtarget:
                 del self.env['MSVSBUILDTARGET']
@@ -1226,14 +1282,15 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
             raise SCons.Errors.InternalError('Unable to open "' + self.filtersabs + '" for writing:' + str(detail))
 
         self.filters_file.write('<?xml version="1.0" encoding="utf-8"?>\n'
-                                '<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">\n')
+                                '<Project ToolsVersion="%s" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">\n' %
+                                self.versionstr)
 
         self.PrintSourceFiles()
 
         self.filters_file.write('</Project>')
         self.filters_file.close()
 
-        self.file.write('\t<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />\n'
+        self.file.write('\t<Import Project="$(VCTargetsPath)\\Microsoft.Cpp.targets" />\n'
                         '\t<ImportGroup Label="ExtensionTargets">\n'
                         '\t</ImportGroup>\n'
                         '</Project>\n')
@@ -1241,10 +1298,10 @@ class _GenerateV10DSP(_DSPGenerator, _GenerateV10User):
         if self.nokeep == 0:
             # now we pickle some data and add it to the file -- MSDEV will ignore it.
             pdata = pickle.dumps(self.configs,PICKLE_PROTOCOL)
-            pdata = base64.encodestring(pdata).decode()
+            pdata = base64.b64encode(pdata).decode()
             self.file.write('<!-- SCons Data:\n' + pdata + '\n')
             pdata = pickle.dumps(self.sources,PICKLE_PROTOCOL)
-            pdata = base64.encodestring(pdata).decode()
+            pdata = base64.b64encode(pdata).decode()
             self.file.write(pdata + '-->\n')
 
     def printFilters(self, hierarchy, name):
@@ -1451,13 +1508,16 @@ class _GenerateV7DSW(_DSWGenerator):
         self.platforms = []
         for key in list(self.configs.keys()):
             platform = self.configs[key].platform
-            if not platform in self.platforms:
+            if platform not in self.platforms:
                 self.platforms.append(platform)
 
         def GenerateProjectFilesInfo(self):
             for dspfile in self.dspfiles:
                 dsp_folder_path, name = os.path.split(dspfile)
                 dsp_folder_path = os.path.abspath(dsp_folder_path)
+                if SCons.Util.splitext(name)[1] == '.filters':
+                    # Ignore .filters project files
+                    continue
                 dsp_relative_folder_path = os.path.relpath(dsp_folder_path, self.dsw_folder_path)
                 if dsp_relative_folder_path == os.curdir:
                     dsp_relative_file_path = name
@@ -1491,6 +1551,7 @@ class _GenerateV7DSW(_DSWGenerator):
         while line:
             line = dswfile.readline()
             datas = datas + line
+        dswfile.close()
 
         # OK, we've found our little pickled cache of data.
         try:
@@ -1506,7 +1567,11 @@ 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 > 14.0:
+        if self.version_num >= 14.2:
+            # Visual Studio 2019 is considered to be version 16.
+            self.file.write('# Visual Studio 16\n')
+        elif self.version_num > 14.0:
+            # Visual Studio 2015 and 2017 are both considered to be version 15.
             self.file.write('# Visual Studio 15\n')
         elif self.version_num >= 12.0:
             self.file.write('# Visual Studio 14\n')
@@ -1617,7 +1682,7 @@ class _GenerateV7DSW(_DSWGenerator):
         self.file.write('EndGlobal\n')
         if self.nokeep == 0:
             pdata = pickle.dumps(self.configs,PICKLE_PROTOCOL)
-            pdata = base64.encodestring(pdata).decode()
+            pdata = base64.b64encode(pdata).decode()
             self.file.write(pdata)
             self.file.write('\n')
 
@@ -1686,11 +1751,8 @@ 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 > 14.0:
-        g = _GenerateV10DSP(dspfile, V15DSPHeader, source, env)
-        g.Build()
-    elif version_num >= 10.0:
-        g = _GenerateV10DSP(dspfile, V10DSPHeader, source, env)
+    if version_num >= 10.0:
+        g = _GenerateV10DSP(dspfile, source, env)
         g.Build()
     elif version_num >= 7.0:
         g = _GenerateV7DSP(dspfile, source, env)
@@ -1730,7 +1792,7 @@ def GenerateProject(target, source, env):
     dspfile = builddspfile.srcnode()
 
     # this detects whether or not we're using a VariantDir
-    if not dspfile is builddspfile:
+    if dspfile is not builddspfile:
         try:
             bdsp = open(str(builddspfile), "w+")
         except IOError as detail:
@@ -1738,6 +1800,7 @@ def GenerateProject(target, source, env):
             raise
 
         bdsp.write("This is just a placeholder file.\nThe real project file is here:\n%s\n" % dspfile.get_abspath())
+        bdsp.close()
 
     GenerateDSP(dspfile, source, env)
 
@@ -1745,7 +1808,7 @@ def GenerateProject(target, source, env):
         builddswfile = target[1]
         dswfile = builddswfile.srcnode()
 
-        if not dswfile is builddswfile:
+        if dswfile is not builddswfile:
 
             try:
                 bdsw = open(str(builddswfile), "w+")
@@ -1754,6 +1817,7 @@ def GenerateProject(target, source, env):
                 raise
 
             bdsw.write("This is just a placeholder file.\nThe real workspace file is here:\n%s\n" % dswfile.get_abspath())
+            bdsw.close()
 
         GenerateDSW(dswfile, source, env)
 
@@ -1781,11 +1845,10 @@ def projectEmitter(target, source, env):
 
         # Project file depends on CPPDEFINES and CPPPATH
         preprocdefs = xmlify(';'.join(processDefines(env.get('CPPDEFINES', []))))
-        includepath_Dirs = processIncludes(env.get('CPPPATH', []), env, None, None)
-        includepath = xmlify(';'.join([str(x) for x in includepath_Dirs]))
+        includepath = xmlify(';'.join(processIncludes(env.get('CPPPATH', []), env, None, None)))
         source = source + "; ppdefs:%s incpath:%s"%(preprocdefs, includepath)
 
-        if 'buildtarget' in env and env['buildtarget'] != None:
+        if 'buildtarget' in env and env['buildtarget'] is not None:
             if SCons.Util.is_String(env['buildtarget']):
                 source = source + ' "%s"' % env['buildtarget']
             elif SCons.Util.is_List(env['buildtarget']):
@@ -1799,7 +1862,7 @@ def projectEmitter(target, source, env):
                 try: source = source + ' "%s"' % env['buildtarget'].get_abspath()
                 except AttributeError: raise SCons.Errors.InternalError("buildtarget can be a string, a node, a list of strings or nodes, or None")
 
-        if 'outdir' in env and env['outdir'] != None:
+        if 'outdir' in env and env['outdir'] is not None:
             if SCons.Util.is_String(env['outdir']):
                 source = source + ' "%s"' % env['outdir']
             elif SCons.Util.is_List(env['outdir']):
@@ -1962,8 +2025,14 @@ def generate(env):
             default_MSVS_SConscript = env.File('SConstruct')
         env['MSVSSCONSCRIPT'] = default_MSVS_SConscript
 
-    env['MSVSSCONS'] = '"%s" -c "%s"' % (python_executable, getExecScriptMain(env))
-    env['MSVSSCONSFLAGS'] = '-C "${MSVSSCONSCRIPT.dir.get_abspath()}" -f ${MSVSSCONSCRIPT.name}'
+    # Allow consumers to provide their own versions of MSVSSCONS and
+    # MSVSSCONSFLAGS. This helps support consumers who use wrapper scripts to
+    # invoke scons.
+    if 'MSVSSCONS' not in env:
+        env['MSVSSCONS'] = '"%s" -c "%s"' % (python_executable, getExecScriptMain(env))
+    if 'MSVSSCONSFLAGS' not in env:
+        env['MSVSSCONSFLAGS'] = '-C "${MSVSSCONSCRIPT.dir.get_abspath()}" -f ${MSVSSCONSCRIPT.name}'
+
     env['MSVSSCONSCOM'] = '$MSVSSCONS $MSVSSCONSFLAGS'
     env['MSVSBUILDCOM'] = '$MSVSSCONSCOM "$MSVSBUILDTARGET"'
     env['MSVSREBUILDCOM'] = '$MSVSSCONSCOM "$MSVSBUILDTARGET"'
diff --git a/engine/SCons/Tool/mwcc.py b/engine/SCons/Tool/mwcc.py
index bc1e62c..b2b2f5b 100644
--- a/engine/SCons/Tool/mwcc.py
+++ b/engine/SCons/Tool/mwcc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/mwcc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
diff --git a/engine/SCons/Tool/mwld.py b/engine/SCons/Tool/mwld.py
index f671319..5049c55 100644
--- a/engine/SCons/Tool/mwld.py
+++ b/engine/SCons/Tool/mwld.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/mwld.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Tool
 
diff --git a/engine/SCons/Tool/nasm.py b/engine/SCons/Tool/nasm.py
index 1615b6b..d4d0a1b 100644
--- a/engine/SCons/Tool/nasm.py
+++ b/engine/SCons/Tool/nasm.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/nasm.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/packaging/__init__.py b/engine/SCons/Tool/packaging/__init__.py
index af60e8b..72b9eef 100644
--- a/engine/SCons/Tool/packaging/__init__.py
+++ b/engine/SCons/Tool/packaging/__init__.py
@@ -25,7 +25,7 @@ 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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/__init__.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Environment
@@ -35,11 +35,11 @@ from SCons.Util import is_List, make_path_relative
 from SCons.Warnings import warn, Warning
 
 import os
-import imp
+import importlib
 
 __all__ = [
-    'src_targz', 'src_tarbz2', 'src_xz', 'src_zip',
-    'targz', 'tarbz2', 'xz', 'zip',
+    'src_targz', 'src_tarbz2', 'src_tarxz', 'src_zip',
+    'targz', 'tarbz2', 'tarxz', 'zip',
     'rpm', 'msi', 'ipk',
 ]
 
@@ -122,12 +122,12 @@ def Package(env, target=None, source=None, **kw):
     # load the needed packagers.
     def load_packager(type):
         try:
-            file,path,desc=imp.find_module(type, __path__)
-            return imp.load_module(type, file, path, desc)
+            # the specific packager is a relative import
+            return importlib.import_module("." + type, __name__)
         except ImportError as e:
-            raise EnvironmentError("packager %s not available: %s"%(type,str(e)))
+            raise SConsEnvironmentError("packager %s not available: %s" % (type, str(e)))
 
-    packagers=list(map(load_packager, PACKAGETYPE))
+    packagers = list(map(load_packager, PACKAGETYPE))
 
     # set up targets and the PACKAGEROOT
     try:
diff --git a/engine/SCons/Tool/packaging/ipk.py b/engine/SCons/Tool/packaging/ipk.py
index 2ebc168..dbf5be8 100644
--- a/engine/SCons/Tool/packaging/ipk.py
+++ b/engine/SCons/Tool/packaging/ipk.py
@@ -3,7 +3,7 @@
 
 #
 # 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
@@ -24,7 +24,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/ipk.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/ipk.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 
@@ -117,17 +117,17 @@ def build_specfiles(source, target, env):
     #
     #
     opened_files={}
-    def open_file(needle, haystack):
+    def open_file(needle, haystack=None):
         try:
             return opened_files[needle]
         except KeyError:
             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')
+            opened_files[needle] = open(file.get_abspath(), 'w')
             return opened_files[needle]
 
-    control_file=open_file('control', target)
+    control_file = open_file('control', target)
 
     if 'X_IPK_DESCRIPTION' not in env:
         env['X_IPK_DESCRIPTION']="%s\n %s"%(env['SUMMARY'],
@@ -149,7 +149,7 @@ Description: $X_IPK_DESCRIPTION
     control_file.write(env.subst(content))
 
     #
-    # now handle the various other files, which purpose it is to set post-, 
+    # now handle the various other files, which purpose it is to set post-,
     # pre-scripts and mark files as config files.
     #
     # We do so by filtering the source files for files which are marked with
@@ -161,14 +161,14 @@ Description: $X_IPK_DESCRIPTION
     # into the same named file.
     #
     for f in [x for x in source if 'PACKAGING_CONFIG' in dir(x)]:
-        config=open_file('conffiles')
+        config = open_file('conffiles')
         config.write(f.PACKAGING_INSTALL_LOCATION)
         config.write('\n')
 
     for str in 'POSTRM PRERM POSTINST PREINST'.split():
         name="PACKAGING_X_IPK_%s"%str
         for f in [x for x in source if name in dir(x)]:
-            file=open_file(name)
+            file = open_file(name)
             file.write(env[str])
 
     #
diff --git a/engine/SCons/Tool/packaging/msi.py b/engine/SCons/Tool/packaging/msi.py
index fbb8b21..4a48b47 100644
--- a/engine/SCons/Tool/packaging/msi.py
+++ b/engine/SCons/Tool/packaging/msi.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/msi.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import SCons
@@ -188,7 +188,7 @@ def build_wxsfile(target, source, env):
     """ Compiles a .wxs file from the keywords given in env['msi_spec'] and
         by analyzing the tree of source nodes and their tags.
     """
-    file = open(target[0].get_abspath(), 'w')
+    f = open(target[0].get_abspath(), 'w')
 
     try:
         # Create a document with the Wix root tag
@@ -209,7 +209,7 @@ def build_wxsfile(target, source, env):
         build_license_file(target[0].get_dir(), env)
 
         # write the xml to a file
-        file.write( doc.toprettyxml() )
+        f.write( doc.toprettyxml() )
 
         # call a user specified function
         if 'CHANGE_SPECFILE' in env:
@@ -217,6 +217,8 @@ def build_wxsfile(target, source, env):
 
     except KeyError as e:
         raise SCons.Errors.UserError( '"%s" package field for MSI is missing.' % e.args[0] )
+    finally:
+        f.close()
 
 #
 # setup function
@@ -440,14 +442,13 @@ def build_license_file(directory, spec):
         pass # ignore this as X_MSI_LICENSE_TEXT is optional
 
     if name!='' or text!='':
-        file = open( os.path.join(directory.get_path(), 'License.rtf'), 'w' )
-        file.write('{\\rtf')
-        if text!='':
-             file.write(text.replace('\n', '\\par '))
-        else:
-             file.write(name+'\\par\\par')
-        file.write('}')
-        file.close()
+        with open(os.path.join(directory.get_path(), 'License.rtf'), 'w') as f:
+            f.write('{\\rtf')
+            if text!='':
+                 f.write(text.replace('\n', '\\par '))
+            else:
+                 f.write(name+'\\par\\par')
+            f.write('}')
 
 #
 # mandatory and optional package tags
diff --git a/engine/SCons/Tool/packaging/rpm.py b/engine/SCons/Tool/packaging/rpm.py
index 3f44d83..a948e29 100644
--- a/engine/SCons/Tool/packaging/rpm.py
+++ b/engine/SCons/Tool/packaging/rpm.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/rpm.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 
@@ -125,11 +125,11 @@ def build_specfile(target, source, env):
     """ Builds a RPM specfile from a dictionary with string metadata and
     by analyzing a tree of nodes.
     """
-    with open(target[0].get_abspath(), 'w') as file:
+    with open(target[0].get_abspath(), 'w') as ofp:
         try:
-            file.write(build_specfile_header(env))
-            file.write(build_specfile_sections(env))
-            file.write(build_specfile_filesection(env, source))
+            ofp.write(build_specfile_header(env))
+            ofp.write(build_specfile_sections(env))
+            ofp.write(build_specfile_filesection(env, source))
 
             # call a user specified function
             if 'CHANGE_SPECFILE' in env:
diff --git a/engine/SCons/Tool/packaging/src_tarbz2.py b/engine/SCons/Tool/packaging/src_tarbz2.py
index eea29cb..b628ccd 100644
--- a/engine/SCons/Tool/packaging/src_tarbz2.py
+++ b/engine/SCons/Tool/packaging/src_tarbz2.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/src_tarbz2.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import putintopackageroot
 
diff --git a/engine/SCons/Tool/packaging/src_targz.py b/engine/SCons/Tool/packaging/src_targz.py
index 94ebea4..4c7469c 100644
--- a/engine/SCons/Tool/packaging/src_targz.py
+++ b/engine/SCons/Tool/packaging/src_targz.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/src_targz.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import putintopackageroot
 
diff --git a/engine/SCons/Tool/packaging/src_tarxz.py b/engine/SCons/Tool/packaging/src_tarxz.py
index 62db2e2..6688c46 100644
--- a/engine/SCons/Tool/packaging/src_tarxz.py
+++ b/engine/SCons/Tool/packaging/src_tarxz.py
@@ -26,7 +26,7 @@ The tarxz SRC packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/src_tarxz.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/src_tarxz.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import putintopackageroot
 
diff --git a/engine/SCons/Tool/packaging/src_zip.py b/engine/SCons/Tool/packaging/src_zip.py
index b1f63fb..d56f3aa 100644
--- a/engine/SCons/Tool/packaging/src_zip.py
+++ b/engine/SCons/Tool/packaging/src_zip.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/src_zip.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import putintopackageroot
 
diff --git a/engine/SCons/Tool/packaging/tarbz2.py b/engine/SCons/Tool/packaging/tarbz2.py
index 70e7ee4..e371f1b 100644
--- a/engine/SCons/Tool/packaging/tarbz2.py
+++ b/engine/SCons/Tool/packaging/tarbz2.py
@@ -26,7 +26,7 @@ The tarbz2 packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/tarbz2.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/tarbz2.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
diff --git a/engine/SCons/Tool/packaging/targz.py b/engine/SCons/Tool/packaging/targz.py
index fa8800d..121e4a4 100644
--- a/engine/SCons/Tool/packaging/targz.py
+++ b/engine/SCons/Tool/packaging/targz.py
@@ -26,7 +26,7 @@ The targz packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/targz.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/targz.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
diff --git a/engine/SCons/Tool/packaging/tarxz.py b/engine/SCons/Tool/packaging/tarxz.py
index bad495b..3ec9822 100644
--- a/engine/SCons/Tool/packaging/tarxz.py
+++ b/engine/SCons/Tool/packaging/tarxz.py
@@ -26,7 +26,7 @@ The tarxz packager.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/packaging/tarxz.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/tarxz.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
diff --git a/engine/SCons/Tool/packaging/zip.py b/engine/SCons/Tool/packaging/zip.py
index c5dd7cc..11ab3b5 100644
--- a/engine/SCons/Tool/packaging/zip.py
+++ b/engine/SCons/Tool/packaging/zip.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/packaging/zip.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Tool.packaging import stripinstallbuilder, putintopackageroot
 
diff --git a/engine/SCons/Tool/pdf.py b/engine/SCons/Tool/pdf.py
index 792c4ca..50988b6 100644
--- a/engine/SCons/Tool/pdf.py
+++ b/engine/SCons/Tool/pdf.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/pdf.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Builder
 import SCons.Tool
diff --git a/engine/SCons/Tool/pdflatex.py b/engine/SCons/Tool/pdflatex.py
index 8d4a1a7..2c559f7 100644
--- a/engine/SCons/Tool/pdflatex.py
+++ b/engine/SCons/Tool/pdflatex.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/pdflatex.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Util
diff --git a/engine/SCons/Tool/pdftex.py b/engine/SCons/Tool/pdftex.py
index c30066d..c658aa0 100644
--- a/engine/SCons/Tool/pdftex.py
+++ b/engine/SCons/Tool/pdftex.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/pdftex.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import SCons.Action
diff --git a/engine/SCons/Tool/qt.py b/engine/SCons/Tool/qt.py
index 1b1925c..a582e6f 100644
--- a/engine/SCons/Tool/qt.py
+++ b/engine/SCons/Tool/qt.py
@@ -33,7 +33,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/qt.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/qt.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import re
@@ -66,11 +66,17 @@ if SCons.Util.case_sensitive_suffixes('.h', '.H'):
 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:
+    find non-standard QT paths
+
+    If the platform does not put QT tools in standard search paths,
+    the path is expected to be set using QTDIR. SCons violates
+    the normal rule of not pulling from the user's environment
+    in this case.  However, some test cases try to validate what
+    happens when QTDIR is unset, so we need to try to make a guess.
+
+    :return: a guess at a path
     """
 
     # qt_bin_dirs = []
@@ -83,6 +89,7 @@ def find_platform_specific_qt_paths():
             # 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')
+            # TODO: all current Fedoras do the same, need to look deeper here.
             qt_bin_dir = '/usr/lib64/qt-3.3/bin'
 
     return qt_bin_dir
@@ -97,7 +104,7 @@ def checkMocIncluded(target, source, env):
     # not really sure about the path transformations (moc.cwd? cpp.cwd?) :-/
     path = SCons.Defaults.CScan.path(env, moc.cwd)
     includes = SCons.Defaults.CScan(cpp, env, path)
-    if not moc in includes:
+    if moc not in includes:
         SCons.Warnings.warn(
             GeneratedMocFileNotIncluded,
             "Generated moc file '%s' is not included by '%s'" %
@@ -118,7 +125,7 @@ class _Automoc(object):
 
     def __init__(self, objBuilderName):
         self.objBuilderName = objBuilderName
-        
+
     def __call__(self, target, source, env):
         """
         Smart autoscan function. Gets the list of objects for the Program
@@ -133,25 +140,25 @@ class _Automoc(object):
             debug = int(env.subst('$QT_DEBUG'))
         except ValueError:
             debug = 0
-        
+
         # some shortcuts used in the scanner
         splitext = SCons.Util.splitext
         objBuilder = getattr(env, self.objBuilderName)
-  
+
         # some regular expressions:
         # Q_OBJECT detection
-        q_object_search = re.compile(r'[^A-Za-z0-9]Q_OBJECT[^A-Za-z0-9]') 
+        q_object_search = re.compile(r'[^A-Za-z0-9]Q_OBJECT[^A-Za-z0-9]')
         # cxx and c comment 'eater'
         #comment = re.compile(r'(//.*)|(/\*(([^*])|(\*[^/]))*\*/)')
         # CW: something must be wrong with the regexp. See also bug #998222
         #     CURRENTLY THERE IS NO TEST CASE FOR THAT
-        
+
         # The following is kind of hacky to get builders working properly (FIXME)
         objBuilderEnv = objBuilder.env
         objBuilder.env = env
         mocBuilderEnv = env.Moc.env
         env.Moc.env = env
-        
+
         # make a deep copy for the result; MocH objects will be appended
         out_sources = source[:]
 
@@ -164,7 +171,7 @@ class _Automoc(object):
             cpp = obj.sources[0]
             if not splitext(str(cpp))[1] in cxx_suffixes:
                 if debug:
-                    print("scons: qt: '%s' is no cxx file. Discarded." % str(cpp)) 
+                    print("scons: qt: '%s' is no cxx file. Discarded." % str(cpp))
                 # c or fortran source
                 continue
             #cpp_contents = comment.sub('', cpp.get_text_contents())
@@ -260,7 +267,7 @@ def uicScannerFunc(node, env, path):
     return result
 
 uicScanner = SCons.Scanner.Base(uicScannerFunc,
-                                name = "UicScanner", 
+                                name = "UicScanner",
                                 node_class = SCons.Node.FS.File,
                                 node_factory = SCons.Node.FS.File,
                                 recursive = 0)
@@ -336,7 +343,7 @@ def generate(env):
         mocBld.prefix[cxx] = '$QT_MOCCXXPREFIX'
         mocBld.suffix[cxx] = '$QT_MOCCXXSUFFIX'
 
-    # register the builders 
+    # register the builders
     env['BUILDERS']['Uic'] = uicBld
     env['BUILDERS']['Moc'] = mocBld
     static_obj, shared_obj = SCons.Tool.createObjBuilders(env)
diff --git a/engine/SCons/Tool/rmic.py b/engine/SCons/Tool/rmic.py
index b2df405..d6f7b2b 100644
--- a/engine/SCons/Tool/rmic.py
+++ b/engine/SCons/Tool/rmic.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/rmic.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 
@@ -110,11 +110,9 @@ def generate(env):
 
     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)
-
+        paths = get_java_install_dirs('win32', version=version)
+        rmic = SCons.Tool.find_program_path(env, 'rmic', default_paths=paths)
         # print("RMIC: %s"%rmic)
         if rmic:
             rmic_bin_dir = os.path.dirname(rmic)
diff --git a/engine/SCons/Tool/rpcgen.py b/engine/SCons/Tool/rpcgen.py
index a495fdd..b9f8ca6 100644
--- a/engine/SCons/Tool/rpcgen.py
+++ b/engine/SCons/Tool/rpcgen.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/rpcgen.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from SCons.Builder import Builder
 import SCons.Util
diff --git a/engine/SCons/Tool/rpm.py b/engine/SCons/Tool/rpm.py
index 9531431..0253365 100644
--- a/engine/SCons/Tool/rpm.py
+++ b/engine/SCons/Tool/rpm.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/rpm.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import re
@@ -51,43 +51,44 @@ def get_cmd(source, env):
     if SCons.Util.is_List(source):
         tar_file_with_included_specfile = source[0]
     return "%s %s %s"%(env['RPM'], env['RPMFLAGS'],
-                       tar_file_with_included_specfile.get_abspath() )
+                       tar_file_with_included_specfile.get_abspath())
 
 def build_rpm(target, source, env):
     # create a temporary rpm build root.
-    tmpdir = os.path.join( os.path.dirname( target[0].get_abspath() ), 'rpmtemp' )
+    tmpdir = os.path.join(os.path.dirname(target[0].get_abspath()), 'rpmtemp')
     if os.path.exists(tmpdir):
         shutil.rmtree(tmpdir)
 
     # now create the mandatory rpm directory structure.
     for d in ['RPMS', 'SRPMS', 'SPECS', 'BUILD']:
-        os.makedirs( os.path.join( tmpdir, d ) )
+        os.makedirs(os.path.join(tmpdir, d))
 
     # set the topdir as an rpmflag.
-    env.Prepend( RPMFLAGS = '--define \'_topdir %s\'' % tmpdir )
+    env.Prepend(RPMFLAGS = '--define \'_topdir %s\'' % tmpdir)
 
     # now call rpmbuild to create the rpm package.
     handle  = subprocess.Popen(get_cmd(source, env),
                                stdout=subprocess.PIPE,
                                stderr=subprocess.STDOUT,
                                shell=True)
-    output = SCons.Util.to_str(handle.stdout.read())
+    with handle.stdout:
+        output = SCons.Util.to_str(handle.stdout.read())
     status = handle.wait()
 
     if status:
-        raise SCons.Errors.BuildError( node=target[0],
-                                       errstr=output,
-                                       filename=str(target[0]) )
+        raise SCons.Errors.BuildError(node=target[0],
+                                      errstr=output,
+                                      filename=str(target[0]))
     else:
         # XXX: assume that LC_ALL=C is set while running rpmbuild
-        output_files = re.compile( 'Wrote: (.*)' ).findall( output )
+        output_files = re.compile('Wrote: (.*)').findall(output)
 
-        for output, input in zip( output_files, target ):
+        for output, input in zip(output_files, target):
             rpm_output = os.path.basename(output)
             expected   = os.path.basename(input.get_path())
 
             assert expected == rpm_output, "got %s but expected %s" % (rpm_output, expected)
-            shutil.copy( output, input.get_abspath() )
+            shutil.copy(output, input.get_abspath())
 
 
     # cleanup before leaving.
diff --git a/engine/SCons/Tool/rpmutils.py b/engine/SCons/Tool/rpmutils.py
index 6c87f73..a2400ff 100644
--- a/engine/SCons/Tool/rpmutils.py
+++ b/engine/SCons/Tool/rpmutils.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/rpmutils.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 
 import platform
@@ -482,9 +482,11 @@ def updateRpmDicts(rpmrc, pyfile):
     """
     try:
         # Read old rpmutils.py file
-        oldpy = open(pyfile,"r").readlines()
+        with open(pyfile,"r") as f:
+            oldpy = f.readlines()
         # Read current rpmrc.in file
-        rpm = open(rpmrc,"r").readlines()
+        with open(rpmrc,"r") as f:
+            rpm = f.readlines()
         # Parse for data
         data = {}
         # Allowed section names that get parsed
@@ -511,24 +513,23 @@ def updateRpmDicts(rpmrc, pyfile):
                     # Insert data
                     data[key][tokens[1]] = tokens[2:]
         # Write new rpmutils.py file
-        out = open(pyfile,"w")
-        pm = 0
-        for l in oldpy:
-            if pm:
-                if l.startswith('# End of rpmrc dictionaries'):
-                    pm = 0
+        with open(pyfile,"w") as out:
+            pm = 0
+            for l in oldpy:
+                if pm:
+                    if l.startswith('# End of rpmrc dictionaries'):
+                        pm = 0
+                        out.write(l)
+                else:
                     out.write(l)
-            else:
-                out.write(l)
-                if l.startswith('# Start of rpmrc dictionaries'):
-                    pm = 1
-                    # Write data sections to single dictionaries
-                    for key, entries in data.items():
-                        out.write("%s = {\n" % key)
-                        for arch in sorted(entries.keys()):
-                            out.write("  '%s' : ['%s'],\n" % (arch, "','".join(entries[arch])))
-                        out.write("}\n\n")
-        out.close()
+                    if l.startswith('# Start of rpmrc dictionaries'):
+                        pm = 1
+                        # Write data sections to single dictionaries
+                        for key, entries in data.items():
+                            out.write("%s = {\n" % key)
+                            for arch in sorted(entries.keys()):
+                                out.write("  '%s' : ['%s'],\n" % (arch, "','".join(entries[arch])))
+                            out.write("}\n\n")
     except:
         pass
 
diff --git a/engine/SCons/Tool/sgiar.py b/engine/SCons/Tool/sgiar.py
index feab04f..d82ec89 100644
--- a/engine/SCons/Tool/sgiar.py
+++ b/engine/SCons/Tool/sgiar.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sgiar.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/sgic++.py b/engine/SCons/Tool/sgic++.py
index 9d5fc96..84d775a 100644
--- a/engine/SCons/Tool/sgic++.py
+++ b/engine/SCons/Tool/sgic++.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sgic++.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 #forward proxy to the preffered cxx version
 from SCons.Tool.sgicxx import *
diff --git a/engine/SCons/Tool/sgicc.py b/engine/SCons/Tool/sgicc.py
index f957534..537f1a3 100644
--- a/engine/SCons/Tool/sgicc.py
+++ b/engine/SCons/Tool/sgicc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sgicc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 from . import cc
 
diff --git a/engine/SCons/Tool/sgicxx.py b/engine/SCons/Tool/sgicxx.py
index f4bfb8d..d44ec26 100644
--- a/engine/SCons/Tool/sgicxx.py
+++ b/engine/SCons/Tool/sgicxx.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sgicxx.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/sgilink.py b/engine/SCons/Tool/sgilink.py
index fa64736..ca9e69c 100644
--- a/engine/SCons/Tool/sgilink.py
+++ b/engine/SCons/Tool/sgilink.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sgilink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/sunar.py b/engine/SCons/Tool/sunar.py
index abce0a4..07d45b2 100644
--- a/engine/SCons/Tool/sunar.py
+++ b/engine/SCons/Tool/sunar.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sunar.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Defaults
 import SCons.Tool
diff --git a/engine/SCons/Tool/sunc++.py b/engine/SCons/Tool/sunc++.py
index ef915f6..1611fe9 100644
--- a/engine/SCons/Tool/sunc++.py
+++ b/engine/SCons/Tool/sunc++.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sunc++.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 
 #forward proxy to the preffered cxx version
diff --git a/engine/SCons/Tool/suncc.py b/engine/SCons/Tool/suncc.py
index 5b01402..da6ca6e 100644
--- a/engine/SCons/Tool/suncc.py
+++ b/engine/SCons/Tool/suncc.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/suncc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/suncxx.py b/engine/SCons/Tool/suncxx.py
index d421946..1ee1c6a 100644
--- a/engine/SCons/Tool/suncxx.py
+++ b/engine/SCons/Tool/suncxx.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/suncxx.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons
 
@@ -52,11 +52,17 @@ def get_package_info(package_name, pkginfo, pkgchk):
         version = None
         pathname = None
         try:
-            sadm_contents = open('/var/sadm/install/contents', 'r').read()
+            from subprocess import DEVNULL # py3k
+        except ImportError:
+            DEVNULL = open(os.devnull, 'wb')
+
+        try:
+            with open('/var/sadm/install/contents', 'r') as f:
+                sadm_contents = f.read()
         except EnvironmentError:
             pass
         else:
-            sadm_re = re.compile('^(\S*/bin/CC)(=\S*)? %s$' % package_name, re.M)
+            sadm_re = re.compile(r'^(\S*/bin/CC)(=\S*)? %s$' % package_name, re.M)
             sadm_match = sadm_re.search(sadm_contents)
             if sadm_match:
                 pathname = os.path.dirname(sadm_match.group(1))
@@ -64,12 +70,12 @@ def get_package_info(package_name, pkginfo, pkgchk):
         try:
             p = subprocess.Popen([pkginfo, '-l', package_name],
                                  stdout=subprocess.PIPE,
-                                 stderr=open('/dev/null', 'w'))
+                                 stderr=DEVNULL)
         except EnvironmentError:
             pass
         else:
             pkginfo_contents = p.communicate()[0]
-            version_re = re.compile('^ *VERSION:\s*(.*)$', re.M)
+            version_re = re.compile(r'^ *VERSION:\s*(.*)$', re.M)
             version_match = version_re.search(pkginfo_contents)
             if version_match:
                 version = version_match.group(1)
@@ -78,7 +84,7 @@ def get_package_info(package_name, pkginfo, pkgchk):
             try:
                 p = subprocess.Popen([pkgchk, '-l', package_name],
                                      stdout=subprocess.PIPE,
-                                     stderr=open('/dev/null', 'w'))
+                                     stderr=DEVNULL)
             except EnvironmentError:
                 pass
             else:
diff --git a/engine/SCons/Tool/sunf77.py b/engine/SCons/Tool/sunf77.py
index 9938d91..c1c216f 100644
--- a/engine/SCons/Tool/sunf77.py
+++ b/engine/SCons/Tool/sunf77.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sunf77.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/sunf90.py b/engine/SCons/Tool/sunf90.py
index 2f6ef97..4cabee8 100644
--- a/engine/SCons/Tool/sunf90.py
+++ b/engine/SCons/Tool/sunf90.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sunf90.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/sunf95.py b/engine/SCons/Tool/sunf95.py
index 1854165..077b1bc 100644
--- a/engine/SCons/Tool/sunf95.py
+++ b/engine/SCons/Tool/sunf95.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sunf95.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Util
 
diff --git a/engine/SCons/Tool/sunlink.py b/engine/SCons/Tool/sunlink.py
index 28ec971..8d965fa 100644
--- a/engine/SCons/Tool/sunlink.py
+++ b/engine/SCons/Tool/sunlink.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/sunlink.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os
 import os.path
diff --git a/engine/SCons/Tool/swig.py b/engine/SCons/Tool/swig.py
index a8d6400..2e61b91 100644
--- a/engine/SCons/Tool/swig.py
+++ b/engine/SCons/Tool/swig.py
@@ -32,7 +32,7 @@ from __future__ import print_function
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/swig.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/swig.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import sys
@@ -184,9 +184,10 @@ def generate(env):
 
     from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
     from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+    from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
 
     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'] )
+        swig = SCons.Tool.find_program_path(env, 'swig', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS + CHOCO_DEFAULT_PATH)
         if swig:
             swig_bin_dir = os.path.dirname(swig)
             env.AppendENVPath('PATH', swig_bin_dir)
diff --git a/engine/SCons/Tool/tar.py b/engine/SCons/Tool/tar.py
index 05a7c70..08c80f2 100644
--- a/engine/SCons/Tool/tar.py
+++ b/engine/SCons/Tool/tar.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/tar.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Action
 import SCons.Builder
diff --git a/engine/SCons/Tool/tex.py b/engine/SCons/Tool/tex.py
index 4607d2f..9beb557 100644
--- a/engine/SCons/Tool/tex.py
+++ b/engine/SCons/Tool/tex.py
@@ -33,7 +33,7 @@ selection method.
 #
 from __future__ import print_function
 
-__revision__ = "src/engine/SCons/Tool/tex.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/tex.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import re
@@ -781,7 +781,7 @@ def tex_emitter_core(target, source, env, graphics_extensions):
         # add side effects if feature is present.If file is to be generated,add all side effects
         if Verbose and theSearch:
             print("check side effects for ",suffix_list[-1])
-        if (theSearch != None) or (not source[0].exists() ):
+        if theSearch is not None or not source[0].exists():
             file_list = [targetbase,]
             # for bibunit we need a list of files
             if suffix_list[-1] == 'bibunit':
diff --git a/engine/SCons/Tool/textfile.py b/engine/SCons/Tool/textfile.py
index 2cfa906..58a5007 100644
--- a/engine/SCons/Tool/textfile.py
+++ b/engine/SCons/Tool/textfile.py
@@ -44,7 +44,7 @@ Textfile/Substfile builder for SCons.
     is unpredictable whether the expansion will occur.
 """
 
-__revision__ = "src/engine/SCons/Tool/textfile.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/textfile.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons
 
diff --git a/engine/SCons/Tool/tlib.py b/engine/SCons/Tool/tlib.py
index 70dd18a..4d8101b 100644
--- a/engine/SCons/Tool/tlib.py
+++ b/engine/SCons/Tool/tlib.py
@@ -27,7 +27,7 @@ XXX
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/tlib.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/tlib.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Tool
 import SCons.Tool.bcc32
diff --git a/engine/SCons/Tool/wix.py b/engine/SCons/Tool/wix.py
index b4f63ad..e79e4a1 100644
--- a/engine/SCons/Tool/wix.py
+++ b/engine/SCons/Tool/wix.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/wix.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import SCons.Builder
 import SCons.Action
diff --git a/engine/SCons/Tool/xgettext.py b/engine/SCons/Tool/xgettext.py
index 8925a9d..185558e 100644
--- a/engine/SCons/Tool/xgettext.py
+++ b/engine/SCons/Tool/xgettext.py
@@ -24,7 +24,24 @@ 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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/xgettext.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
+
+import os
+import re
+import subprocess
+import sys
+
+import SCons.Action
+import SCons.Node.FS
+import SCons.Tool
+import SCons.Util
+from SCons.Builder import BuilderBase
+from SCons.Environment import _null
+from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
+from SCons.Tool.GettextCommon import _POTargetFactory
+from SCons.Tool.GettextCommon import RPaths, _detect_xgettext
+from SCons.Tool.GettextCommon import _xgettext_exists
 
 
 #############################################################################
@@ -41,10 +58,6 @@ class _CmdRunner(object):
         self.commandstr = commandstr
 
     def __call__(self, target, source, env):
-        import SCons.Action
-        import subprocess
-        import os
-        import sys
         kw = {
             'stdin': 'devnull',
             'stdout': subprocess.PIPE,
@@ -57,11 +70,10 @@ class _CmdRunner(object):
         self.out, self.err = proc.communicate()
         self.status = proc.wait()
         if self.err:
-            sys.stderr.write(unicode(self.err))
+            sys.stderr.write(SCons.Util.UnicodeType(self.err))
         return self.status
 
     def strfunction(self, target, source, env):
-        import os
         comstr = self.commandstr
         if env.subst(comstr, target=target, source=source) == "":
             comstr = self.command
@@ -74,9 +86,6 @@ class _CmdRunner(object):
 #############################################################################
 def _update_pot_file(target, source, env):
     """ Action function for `POTUpdate` builder """
-    import re
-    import os
-    import SCons.Action
     nop = lambda target, source, env: 0
 
     # Save scons cwd and os cwd (NOTE: they may be different. After the job, we
@@ -154,10 +163,6 @@ def _update_pot_file(target, source, env):
 #############################################################################
 
 #############################################################################
-from SCons.Builder import BuilderBase
-
-
-#############################################################################
 class _POTBuilder(BuilderBase):
     def _execute(self, env, target, source, *args):
         if not target:
@@ -175,10 +180,6 @@ class _POTBuilder(BuilderBase):
 def _scan_xgettext_from_files(target, source, env, files=None, path=None):
     """ Parses `POTFILES.in`-like file and returns list of extracted file names.
     """
-    import re
-    import SCons.Util
-    import SCons.Node.FS
-
     if files is None:
         return 0
     if not SCons.Util.is_List(files):
@@ -230,10 +231,6 @@ def _scan_xgettext_from_files(target, source, env, files=None, path=None):
 #############################################################################
 def _pot_update_emitter(target, source, env):
     """ Emitter function for `POTUpdate` builder """
-    from SCons.Tool.GettextCommon import _POTargetFactory
-    import SCons.Util
-    import SCons.Node.FS
-
     if 'XGETTEXTFROM' in env:
         xfrom = env['XGETTEXTFROM']
     else:
@@ -261,10 +258,6 @@ def _pot_update_emitter(target, source, env):
 #############################################################################
 
 #############################################################################
-from SCons.Environment import _null
-
-
-#############################################################################
 def _POTUpdateBuilderWrapper(env, target=None, source=_null, **kw):
     return env._POTUpdateBuilder(target, source, **kw)
 
@@ -274,8 +267,6 @@ def _POTUpdateBuilderWrapper(env, target=None, source=_null, **kw):
 #############################################################################
 def _POTUpdateBuilder(env, **kw):
     """ Creates `POTUpdate` builder object """
-    import SCons.Action
-    from SCons.Tool.GettextCommon import _POTargetFactory
     kw['action'] = SCons.Action.Action(_update_pot_file, None)
     kw['suffix'] = '$POTSUFFIX'
     kw['target_factory'] = _POTargetFactory(env, alias='$POTUPDATE_ALIAS').File
@@ -288,13 +279,6 @@ 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 )
@@ -359,7 +343,6 @@ def generate(env, **kw):
 #############################################################################
 def exists(env):
     """ Check, whether the tool exists """
-    from SCons.Tool.GettextCommon import _xgettext_exists
     try:
         return _xgettext_exists(env)
     except:
diff --git a/engine/SCons/Tool/yacc.py b/engine/SCons/Tool/yacc.py
index d328d20..6857574 100644
--- a/engine/SCons/Tool/yacc.py
+++ b/engine/SCons/Tool/yacc.py
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/yacc.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/yacc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import sys
@@ -45,6 +45,11 @@ from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
 
 YaccAction = SCons.Action.Action("$YACCCOM", "$YACCCOMSTR")
 
+if sys.platform == 'win32':
+    BINS = ['bison', 'yacc', 'win_bison']
+else:
+    BINS = ["bison", "yacc"]
+
 def _yaccEmitter(target, source, env, ysuf, hsuf):
     yaccflags = env.subst("$YACCFLAGS", target=target, source=source)
     flags = SCons.Util.CLVar(yaccflags)
@@ -100,25 +105,26 @@ def yyEmitter(target, source, env):
 
 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']
+    Find the path to the yacc tool, searching several possible names
+
+    Only called in the Windows case, so the default_path
+    can be Windows-specific
 
-    for prog in bins:
+    :param env: current construction environment
+    :param append_paths: if set, add the path to the tool to PATH
+    :return: path to yacc tool, if found
+    """
+    for prog in BINS:
         bin_path = SCons.Tool.find_program_path(
-            env, 
-            prog, 
+            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:
+            if append_paths:
                 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')
+    SCons.Warnings.Warning('yacc tool requested, but yacc or bison binary not found in ENV PATH')
+
 
 def generate(env):
     """Add Builders and construction variables for yacc to an Environment."""
@@ -140,29 +146,21 @@ def generate(env):
     cxx_file.add_emitter('.yy', yyEmitter)
 
     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')
+        # ignore the return, all we need is for the path to be added
+        _ = get_yacc_path(env, append_paths=True)
 
-    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["YACC"] = env.Detect(BINS)
     env['YACCFLAGS'] = SCons.Util.CLVar('')
     env['YACCCOM']   = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
     env['YACCHFILESUFFIX'] = '.h'
-
     env['YACCHXXFILESUFFIX'] = '.hpp'
-
     env['YACCVCGFILESUFFIX'] = '.vcg'
 
 def exists(env):
-    return env.Detect(['bison', 'yacc'])
+    if sys.platform == 'win32':
+        return get_yacc_path(env)
+    else:
+        return env.Detect(BINS)
 
 # Local Variables:
 # tab-width:4
diff --git a/engine/SCons/Tool/zip.py b/engine/SCons/Tool/zip.py
index 2689634..b7efdc7 100644
--- a/engine/SCons/Tool/zip.py
+++ b/engine/SCons/Tool/zip.py
@@ -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 a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/zip.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path