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Change Log
+NOTE: The 4.0.0 Release of SCons will drop Python 2.7 Support
+
+RELEASE 3.1.2 - Mon, 17 Dec 2019 02:06:27 +0000
+
+ From Edoardo Bezzeccheri
+ - Added debug option "action_timestamps" which outputs to stdout the absolute start and end time for each target.
+
+ From Rob Boehne
+ - Fix suncxx tool (Oracle Studio compiler) when using Python 3. Previously would throw an exception.
+ Resolved by properly handling tool version string output as unicode.
+
+ From Tim Gates
+ - Resolved a typo in engine.SCons.Tool
+
+ From Adam Gross:
+ - Resolved a race condition in multithreaded Windows builds with Python 2
+ in the case where a child process is spawned while a Python action has a
+ file open. Original author: Ryan Beasley.
+
+ From Jason Kenny
+ - Update Command() function to accept target_scanner, source_factory, and target_factory arguments.
+ This makes Command act more like a one-off builder.
+
+ From Ivan Kravets
+ - Added support for "-imacros" to ParseFlags
+
+ From Jacek Kuczera:
+ - Fix CheckFunc detection code for Visual 2019. Some functions
+ (e.g. memmove) were incorrectly recognized as not available.
+
+ From Jakub Kulik
+ - Fix stacktrace when using SCons with Python 3.5+ and SunOS/Solaris related tools.
+
+ From Philipp Maierhöfer:
+ - Avoid crash with UnicodeDecodeError on Python 3 when a Latex log file in
+ non-UTF-8 encoding (e.g. containing umlauts in Latin-1 encoding when
+ the fontenc package is included with \usepackage[T1]{fontenc}) is read.
+
+ From Mathew Robinson:
+ - Improved threading performance by ensuring NodeInfo is shared
+ across threads. Results in ~13% improvement for parallel builds
+ (-j# > 1) with many shared nodes.
+ - Improve performance of Entry.disambiguate() by making check for
+ most common case first, preventing unnecessary IO.
+ - Improved DAG walk performance by reducing unnecessary work when
+ there are no un-visited children.
+
+ From Mats Wichmann
+ - Replace instances of string find method with "in" checks where
+ the index from find() was not used.
+ - CmdStringHolder fix from issue #3428
+ - Turn previously deprecated debug options into failures:
+ --debug=tree, --debug=dtree, --debug=stree, --debug=nomemoizer.
+ - Experimental New Feature: Enable caching MSVC configuration
+ If SCONS_CACHE_MSVC_CONFIG shell environment variable is set,
+ SCons will cache the results of past calls to vcvarsall.bat to
+ a file; integrates with existing memoizing of such vars.
+ On vs2019 saves 5+ seconds per SCons invocation, which really
+ helps test suite runs.
+ - Remove deprecated SourceSignatures, TargetSignatures
+ - Remove deprecated Builder keywords: overrides and scanner
+ - Remove deprecated env.Copy
+ - Remove deprecated BuildDir plus SConscript keyword build_dir
+ - A number of documentation improvements.
+
+
RELEASE 3.1.1 - Mon, 07 Aug 2019 20:09:12 -0500
From William Deegan: