Scons

From Arfrever Frehtes Taifersar Arahesis:
- Fix for Bug 2791 - Setup.py fails unnecessarily under Jython.

From Dirk Baechle:
- Fixed license of SVG titlepage files in the context of Debian
packaging, such that they allow for commercial use too (2985).

From William Blevins:
- InstallVersionedLib now available in the DefaultEnvironment context.
- Improves orthogonality of use cases between different Install functions.

From Carnë Draug:
- Added new configure check, CheckProg, to check for
existence of a program.

From Andrew Featherstone:
- Fix for issue 2840 - Fix for two environments specifying same target with different
actions not throwing hard error. Instead SCons was incorrectly issuing a warning
and continuing.

From Hiroaki Itoh :
- Add support `Microsoft Visual C++ Compiler for Python 2.7'
Compiler can be obtained at: https://www.microsoft.com/en-us/download/details.aspx?id=44266

From Florian Miedniak:
- Fixed tigris issue 3011: Glob() excludes didn't work when used with VariantDir(duplicate=0)

From William Roberts:
- Fix bug 2831 and allow Help() text to be appended to AddOption() help.

From Paweł Tomulik:
- Reimplemented versioning for shared libraries, with the following effects
- Fixed tigris issues 3001, 3006.
- Fixed several other issues not reported to tigris, including:
issues with versioned libraries in subdirectories with tricky names,
issues with versioned libraries and variant directories,
issue with soname not being injected to library when using D linkers,
- Switched to direct symlinks instead of daisy-chained ones -- soname and
development symlinks point directly to the versioned shared library now),
for rationale see:
https://www.debian.org/doc/debian-policy/ch-sharedlibs.html
https://fedoraproject.org/wiki/Packaging:Guidelines#Devel_Packages
https://bitbucket.org/scons/scons/pull-requests/247/new-versioned-libraries-gnulink-cyglink/diff#comment-10063929
- New construction variables to allow override default behavior: SONAME,
SHLIBVERSIONFLAGS, _SHLIBVERSIONFLAGS, SHLIBNOVERSIONSYMLINKS,
LDMODULEVERSION, LDMODULEVERSIONFLAGS, _LDMODULEVERSIONFLAGS,
LDMODULENOVERSIONSYMLINKS.
- Changed logic used to configure the versioning machinery from
platform-centric to linker-oriented.
- The SHLIBVERSION/LDMODULEVERSION variables are no longer validated by
SCons (more freedom to users).
- InstallVersionedLib() doesn't use SHLIBVERSION anymore.
- Enchanced docs for the library versioning stuff.
- New tests for versioned libraries.
- Library versioning is currently implemented for the following linker
tools: 'cyglink', 'gnulink', 'sunlink'.
- Fix to swig tool - pick-up 'swig', 'swig3.0' and 'swig2.0' (in order).
- Fix to swig tool - respect env['SWIG'] provided by user.

From Dirk Baechle:
- Switched several core classes to use "slots", to
reduce the overall memory consumption in large
projects (fixes 2180, 2178, 2198)
- Memoizer counting uses decorators now, instead of
the old metaclasses approach.

From Andrew Featherstone
- Fixed typo in SWIGPATH description

From Rob Smith:
- Added support for Visual Studio 2015

From Stephen Pollard:
- Documentation fixes for libraries.xml and
builders-writing.xml (2989 and 2990)

From William Deegan:
- Extended docs for InstallVersionedLib/SharedLibrary,
and added SKIP_WIN_PACKAGES argument to build script
bootstrap.py (PR 230, 3002).

From William Blevins:
- Fixed symlink support (PR 227, 2395).
- Updated debug-count test case (PR 229).

From Alexey Klimkin:
- Fixed incomplete LIBS flattening and substitution in
Program scanner(PR 205, 2954).

From Dirk Baechle:
- Added new method rentry_exists_on_disk to Node.FS (PR 193).

From Russel Winder:
- Fixed several D tests under the different OS.
- Add support for f08 file extensions for Fortran 2008 code.

From Anatoly Techtonik:
- Show --config choices if no argument is specified (PR 202).
- Fixed build crash when XML toolchain isn't installed, and
activated compression for ZIP archives.

From Alexandre Feblot:
- Fix for VersionedSharedLibrary under 'sunos' platform.
- Fixed dll link with precompiled headers on MSVC 2012
- Added an 'exclude' parameter to Glob()

From Laurent Marchelli:
- Support for multiple cmdargs (one per variant) in VS project files.
- Various improvements for TempFileMunge class.
- Added an implementation for Visual Studio users files (PR 209).

From Dan Pidcock:
- Added support for the 'PlatformToolset' tag in VS project files (2978).

From James McCoy:
- Added support for '-isystem' to ParseFlags.

From Bernhard Walle and Dirk Baechle:
- Fixed the interactive mode, in connection with
Configure contexts (2971).

From Anatoly Techtonik:
- Fix EnsureSConsVersion warning when running packaged version

From Russel Winder:
- Fix D tools for building shared libraries

From Roland Stark:
- Fixed false line length calculation in the TempFileMunge class (2970).

From Gary Oberbrunner:
- Improve SWIG detection

From Russel Winder:
- Fix regression on Windows in D language update

From Neal Becker and Stefan Zimmermann:
- Python 3 port and compatibility

From Anatoly Techtonik:
- Do not fail on EnsureSConsVersion when running from checkout

From Kendrick Boyd and Rob Managan:
- Fixed the newglossary action to work with VariantDir (LaTeX).

From Manuel Francisco Naranjo:
- Added a default for the BUILDERS environment variable,
to prevent not defined exception on a Clone().

From Andrew Featherstone:
- Added description of CheckTypeSize method (1991).
- Fixed handling of CPPDEFINE var in Append()
for several list-dict combinations (2900).

From William Blevins:
- Added test for Java derived-source dependency tree generation.
- Added Copy Action symlink soft-copy support (2395).
- Various contributions to the documentation (UserGuide).