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SCons - a software construction tool
Change Log
NOTE: The 4.0.0 Release of SCons dropped Python 2.7 Support
NOTE: 4.3.0 now requires Python 3.6.0 and above. Python 3.5.x is no longer supported
RELEASE VERSION/DATE TO BE FILLED IN LATER
From John Doe:
- Whatever John Doe did.
RELEASE 4.3.0 - Tue, 16 Nov 2021 18:12:46 -0700
From Jacob Cassagnol:
- Default hash algorithm check updated for SCons FIPS compliance. Now checks for hash viability
first and then walks the tree to use the first viable hash as the default one. This typically
selects SHA1 on FIPS-enabled systems less than Python 3.9 as the new default instead of MD5,
unless SHA1 has also been disabled by security policy, at which point SCons selects SHA256
as the default. For systems running Python 3.9 and later, the hashlib bug has been fixed,
and SCons will once again default to MD5 as the preferred algorithm.
From Joseph Brill:
- Fix MSVS tests (vs-N.N-exec.py) for MSVS 6.0, 7.0, and 7.1 (import missing module).
- Add support for Visual Studio 2022.
From William Deegan:
- Fix reproducible builds. Restore logic respecting SOURCE_DATE_EPOCH when set.
- Fix version tests to work with updated scons --version output. (Date format changed)
- Fix issue #4021. Change the way subst() is used in Textfile() to not evaluate '$$(' -> '$',
but instead it should yield '$('.
- Change SCons.Platform.win32.get_architecture() to return platform.platform() when run in an
environment where neither: PROCESSOR_ARCHITEW6432 nor PROCESSOR_ARCHITECTURE is set.
This should fix platform tests which started failing when HOST_OS/HOST_ARCH changes
introduced by Aaron Franke (listed below) were merged.
- Further PCH updates. It's now recommended that env['PCH'] should always be a File node.
Either via return value from env.PCH() or by explicitly using File('StdAfx.pch').
- Added --no-ignore-skips to runtest.py. Changed default to ignore skips when setting
runtest.py's exit status. Previously would exit 2 if any tests were skipped.
Now will only exit 2 if user specifies --no-ignore-skips and some tests were skipped.
From Ryan Egesdahl:
- Small fix to ensure CLVar default value is an empty list.
See MongoDB bug report: https://jira.mongodb.org/browse/SERVER-59656
Code contributed by MongoDB.
- Ninja - Fixed an issue where if you control-c and/or killed ninja while it was running scons to
regenerate build.ninja you would end up with no build.ninja file and have to rerun scons from scratch.
Code contributed by MongoDB.
From Aaron Franke:
- Define HOST_OS and HOST_ARCH in the environment for all platforms.
Before this change, these were only defined for Win32 and OS/2.
From Daniel Moody:
- Fix ninja tool to never use for_sig substitution because ninja does not use signatures. This
issue affected CommandGeneratorAction function actions specifically.
- Expanded ninja Mkdir to also support Mkdir actions.
- Added support for the PCH environment variable to support subst generators.
- Fix command line escaping for ninja dollar sign escape. Without escaping ninja properly,
the ninja file scons regenerate and callback invocations will lose the $ characters used in
the scons command line which ninja uses itself for escaping. For Example:
scons BUILD=xyz OTHERVAR=$BUILD
Prior to this fix, it would cause ninja to fail to escape the dollar sign, leading to the
single dollar sign being used as a ninja escape character in the ninja file.
From Daniel Moody:
- Added ninja API 'NINJA_FORCE_SCONS_BUILD' to force a node to callback to scons.
From Mats Wichmann:
- Two small Python 3.10 fixes: one more docstring turned into raw
because it contained an escape; updated "helpful" syntax error message
from 3.10 was not expected by SubstTests.py and test/Subst/Syntax.py
- EmitterProxy rich comparison set is completed (checker warning).
Added __le__, __gt__, __ge__.
- Fix gcc/g++ tool failing if "gcc --version" returns text which fails
to_String conversion (i.e., not UTF-8) - failure happens when tool
initialization checks version. For gcc, the initial version string is
not translated, for the rest, don't convert, just consume raw and discard.
- Maintenance and doc: modernize some usage in Scanner package,
calling super(), switching some imitialization to comprehensions,
and code formatting. Docstring for scanner Base moved from
init-method to class-level so it's picked up by Sphinx.
Added new sconsign filenames to skip_entry_list in Scanner/Dir.py
- Change SCons.Scanner.Base to ScannerBase. Old name kept as an alias
but is now unused in SCons itself.
- Call Variables option converter consistently - the converter should
have access to the env if it needs to (issue #2064).
- Fixed the variables Add() method to accept a tuple for the variable
name the same way AddVariables() does (issue #3869).
- The premade validator PathIsDirCreate for for PathVariable now catches
the case where the directory could not be created due to permission
problems, allowing a more helpful error to be emitted (issue #2828)
- Maintenance: Python thread.setDaemon is deprecated in favor of
directly updating daemon attribute - update SCons to do this.
- Make sure when subst'ing a callable, the callable is called with
the correct for_signature value, previously it would be true even
if doing SUBST_RAW (issue #4037)
- Update Util/NodeList implementation to get rid of a workaround for
early Python 3 slicing issue that is no longer a problem.
- Rework some Java tests to skip rather than fail on CI systems, where
the working java is > v9, but a 1.8 or 9 was also found.
- Java updates: on Windows, detect more default JDK install locations.
On all platforms, more Java versions (up to 17.0 now). Add more information
on version selection to docs.
Update docs on JavaH tool in light of javah command dropped since 10.0.
Try to be better about preserving user's passed-in JAVA* construction vars.
- Start the deprecation of the qt tool, which refers to Qt3 (usupported
since around 2006). There's a deprecation warning added, initially
defaulting to disabled.
From Brian Quistorff:
- Fix crash when scons is run from a python environement where a signal
is set from outside Python.
RELEASE 4.2.0 - Sat, 31 Jul 2021 18:12:46 -0700
From Byron Platt:
- Fix Install() issue when copytree recursion gives bad arguments that can
lead to install side-effects including keeping dangling symlinks and
silently failing to copy directories (and their subdirectories) when the
directory already exists in the target.
From Joseph Brill:
- Internal MSVS update: Remove unnecessary calls to find all installed versions of msvc
when constructing the installed visual studios list.
From William Deegan:
- Improve Subst()'s logic to check for proper callable function or class's argument list.
It will now allow callables with expected args, and any extra args as long as they
have default arguments. Additionally functions with no defaults for extra arguments
as long as they are set using functools.partial to create a new callable which set them.
- Fix Issue #3035 - mingw with SHLIBVERSION set fails with either not a dll error or
"Multiple ways to build the same target were specified for:". Now mingw will disable
creating the symlinks (and adding version string to ) dlls. It sets SHLIBNOVERSIONSYMLINKS,
IMPLIBNOVERSIONSYMLINKS and LDMODULENOVERSIONSYMLINKS to True.
- Added --experimental flag, to enable various experimental features/tools. You can specify
'all', 'none', or any combination of available experimental features.
- Fix Issue #3933 - Remove unguarded print of debug information in SharedLibrary logic when
SHLIBVERSION is specified.
- Fix versioned shared library naming for MacOS platform. (Previously was libxyz.dylib.1.2.3,
has been fixed to libxyz.1.2.3.dylib. Additionally the sonamed symlink had the same issue,
that is now resolved as well)
- Add experimental ninja builder. (Contributed by MongoDB, Daniel Moody and many others).
- Fix #3955 - _LIBDIRFLAGS leaving $( and $) in *COMSTR output. Added affect_signature flag to
_concat function. If set to False, it will prepend and append $( and $). That way the various
Environment variables can use that rather than "$( _concat(...) $)".
- Fix issue with exparimental ninja tool which would fail on windows or when ninja package wasn't
installed but --experimental=ninja was specified.
- As part of experimental ninja tool, allow SetOption() to set both disable_execute_ninja and
disable_ninja.
From David H:
- Fix Issue #3906 - `IMPLICIT_COMMAND_DEPENDENCIES` was not properly disabled when
set to any string value (For example ['none','false','no','off'])
Also previously 'All' wouldn't have the desired affect.
From Ivan Kravets:
- Provide a custom argument escape function for `TempFileMunge` using a new
`TEMPFILEARGESCFUNC` variable. Useful if you need to apply extra operations on
a command argument before writing to a temporary file (fix Windows slashes,
normalize paths, etc.)
From Henrik Maier:
- DocbookXslt tool: The XSLT stylesheet file is now initialized to an env.File() Node,
such that dependencies work correctly in hierarchical builds (eg when using
DocbookXslt in SConscript('subdir/SConscript') context.
From Daniel Moody:
- Update CacheDir to use uuid for tmpfile uniqueness instead of pid.
This fixes cases for shared cache where two systems write to the same
cache tmpfile at the same time because the happened to get the same pid.
- Added support for passing custom CacheDir derived classes to SCons. Moved
copy_from_cache attribute from the Environment class to CacheDir class.
Code contributed by MongoDB.
- Update BuildTask to pass all targets to the progress object fixing an issue
where multi-target build nodes only got the first target passed to the progress
object.
- Fix a potential race condition in shared cache environments where the permissions are
not writeable for a moment after the file has been renamed and other builds (users) will copy
it out of the cache. Small reorganization of logic to copy files from cachedir. Moved CacheDir
writeable permission code for copy to cache behind the atomic rename operation.
- Added marking of intermediate and and multi target nodes generated from SConf tests so that
is_conftest() is more accurate.
- Added test for configure check failing to ensure it didn't break generating and running ninja.
From Mats Wichmann:
- Initial support in tests for Python 3.10 - expected bytecode and
one changed expected exception message. Change some more regexes
to be specified as rawstrings in response to DeprecationWarnings.
- Add an example of adding an emitter to User Guide (concept
from Jeremy Elson)
- Add timing information for sconsign database dump when --debug=time
is selected. Also switch to generally using time.perf_counter,
which is the Python recommended way for timing short durations.
- Drop remaining definitions of dict-like has_key methods, since
Python 3 doesn't have a dictionary has_key (maintenance)
- Do not treat --site-dir=DIR and --no-site-dir as distinct options.
Allows a later instance to override an earlier one.
- Ignore empty cmdline arguments when computing targets (issue 2986)
- Remove long-deprecated construction variables PDFCOM, WIN32_INSERT_DEF,
WIN32DEFPREFIX, WIN32DEFSUFFIX, WIN32EXPPREFIX, WIN32EXPSUFFIX.
All have been replaced by other names since at least 1.0.
- Add a __iadd__ method to the CLVar class so that inplace adds
(+=) also work as expected (issue 2399)
- Remove local copy of CLVar in EnvironmentTests unittest file -
should be testing against the production version, and they
didn't really differ.
- Don't strip spaces in INSTALLSTR by using raw subst (issue 2018)
- Deprecate Python 3.5 as a supported version.
- CPPDEFINES now expands construction variable references (issue 2363)
- Restore behavior that Install()'d files are writable (issue 3927)
- Simplified Mkdir(), the internal mkdir_func no longer needs to handle
existing directories, it can now pass exist_ok=True to os.makedirs().
- Avoid WhereIs exception if user set a tool name to empty (from issue 1742)
- Maintenance: remove obsolete __getslice__ definitions (Py3 never calls);
add Node.fs.scandir to call new (Py3.5) os.scandir; Node.fs.makedirs
now passes the exist_ok flag; Cachedir creation now uses this flag.
- Maintenance: remove unneeded imports and reorganize some. Fix uses
of warnings in some tools which instantiated the class but did nothing
with them, need to instead call SCons.Warnings.warn with the warn class.
- Drop overridden changed_since_last_build method in Value class.
- Resync the SetOption implementation and the manpage, making sure new
options are available and adding a notes column for misc information.
SetOption equivalents to --hash-chunksize, --implicit-deps-unchanged
and --implicit-deps-changed are enabled.
- Add tests for SetOption failing on disallowed options and value types.
- Maintenance: eliminate lots of checker complaints about Util.py.
- Maintenance: fix checker-spotted issues in Environment (apply_tools)
and EnvironmentTests (asserts comparing with self).
For consistency, env.Tool() now returns a tool object the same way
Tool() has done.
- Change SConscript() missing SConscript behavior - if must_exist=False,
the warning is suppressed.
- Make sure TEMPFILEPREFIX can be set to an empty string (issue 3964)
From Dillan Mills:
- Add support for the (TARGET,SOURCE,TARGETS,SOURCES,CHANGED_TARGETS,CHANGED_SOURCES}.relpath property.
This will provide a path relative to the top of the build tree (where the SConstruct is located)
Fixes #396
From Andrew Morrow:
- Fix issue #3790: Generators in CPPDEFINES now have access to populated source
and target lists
RELEASE 4.1.0 - Tues, 19 Jan 2021 15:04:42 -0700
From James Benton:
- Add COMPILATIONDB_PATH_FILTER env option for CompilationDatabase() builder which allows
filtering of entries based on the output file paths using glob style file matching (issue #3742).
From Joseph Brill:
- Internal MSVC and test updates: Rework the msvc installed versions cache so that it
is not exposed externally and update external references accordingly.
- Modify the MSCommon internal-use only debug logging records to contain the correct relative
file path when the debug function is called from outside the MSCommon module.
From William Deegan:
- Fix yacc tool, not respecting YACC set at time of tool initialization.
- Refactor SCons.Tool to move all common shared and loadable module linking logic to SCons.Tool.linkCommon
- Remove pywin32 imports from SCons.Script.Main. No longer needed.
- Switch to use ctypes instead of pywin32 (requiring an extra pip install) - Fixes Github Issue #2291
- pywin32 no longer necessary for SCons install. (pip install SCons will no longer also require pywin32 on win32)
- Remove pywin32 usage from SCons.Util where it was used for accessing the registry. Python native winreg
library already includes this functionality.
- Remove using pywin32 to retrieve peak memory usage on Win32 for `--debug=memory`
- Fix Issue #3759 - include scons.1, sconsign.1, scons-time.1 manpages in sdist and wheel packages.
- Change SCons's build so the generated `SCons/__init__.py` is no longer removed by `scons -c`
- Completely rewrote versioned shared libraries logic. Added support for SOVERSION via dmoody's initial PR #3733
- No longer automatically disable setting SONAME on shared libraries on OpenBSD.
- Fix race condition bug when initializing a scons cache directory at the
same time from multiple threads or processes. Problem described in PR #3114.
This is a simpler fix which should avoid some problems identified with the initial PR.
(Credit to Fredrik Medley for reporting the issue, the initial PR, and discussing and testing
this solution)
- Minor edits to User Guide and manpage's header with copyright, released date changed.
From Michał Górny:
- Fix dvipdf test failure due to passing incorrect flag to dvipdf.
From Adam Gross:
- Fix minor bug affecting SCons.Node.FS.File.get_csig()'s usage of the MD5 chunksize.
User-facing behavior does not change with this fix (GH Issue #3726).
- Fix occasional test failures caused by not being able to find a file or directory fixture
when running multiple tests with multiple jobs.
- Added support for a new command-line parameter `--hash-format` to override the default
hash format that SCons uses. It can also be set via `SetOption('hash_format')`. Supported
values are: `md5`, `sha1`, and `sha256`. For all hash formats other than
the default of `md5`, the SConsign database will include the name of the hash format.
For example, `--hash-format=sha256` will create a SConsign with name
`.sconsign_sha256.dblite.`.
- Fix incorrect cache hits and/or misses when running in interactive mode by having
SCons.Node.Node.clear() clear out all caching-related state.
- Change Environment.SideEffect() to not add duplicate side effects.
NOTE: The list of returned side effect Nodes will not include any duplicate side effect Nodes.
- Add support to the Python scanner for finding dynamically generated dependencies.
Previously the scanner only found imports if they existed on disk at scanning time.
From David H:
- Add ZIP_OVERRIDE_TIMESTAMP env option to Zip builder which allows for overriding of the file
modification times in the archive.
- Fix Zip builder not rebuilding when ZIPROOT env option was changed.
From Jason Kenny
- Fix python3 crash when Value node get_text_content when child content does not have decode()
NOTE: If you depend on Value node's get_text_content returning concatenated contents of it's
children. This may break your code. It now concatenates the csig() of all children.
From Joachim Kuebart:
- Suppress missing SConscript deprecation warning if `must_exist=False`
is used.
From Rocco Matano:
- Fix Zip tool to respect ZIPCOMSTR. Previously all zip builder calls would yield something
like zip(["test.zip"], ["zip_scons.py"]) and ignore ZIPCOMSTR if ZIPCOM and ZIPCOMSTR
weren't set after the Environment/Tool is initialized. (Explained in PR #3659)
From Daniel Moody:
- Fix issue where java parsed a class incorrectly from lambdas used after a new.
From Simon Tegelid
- Fix using TEMPFILE in multiple actions in an action list. Previously a builder, or command
with an action list like this:
['${TEMPFILE("xxx.py -otempfile $SOURCE")}', '${TEMPFILE("yyy.py -o$TARGET tempfile")}']
Could yield a single tempfile with the first TEMPFILE's contents, used by both steps
in the action list.
From Mats Wichmann:
- Complete tests for Dictionary, env.keys() and env.values() for
OverrideEnvironment. Enable env.setdefault() method, add tests.
- Raise an error if an option (not otherwise consumed) is used which
looks like an abbreviation of one one added by AddOption. (#3653)
- Tool module not found will now raise a UserError to more clearly indicate this is
probably an SConscript problem, and to make the traceback more relevant.
- Fix three issues with MergeFlags:
- Signature/return did not match documentation or existing usage - the implementation
now no longer returns the passed env
- merging --param arguments did not work (issue #3107);
- passing a dict to merge where the values are strings failed (issue #2961).
- Include previously-excluded SideEffect section in User Guide.
- Clean up unneeded imports (autoflake tool).
- Make sure cProfile is used if profiling - SCons was expecting
the Util module to monkeypatch in cProfile as profile if available,
but this is no longer being done.
- Cleanup in SCons.Util.AddMethod. If called with an environment instance
as the object to modify, the method would not be correctly set up in
any Clone of that instance. Now tries to detect this and calls
MethodWrapper to set up the method the same way env.AddMethod does.
MethodWrapper moved to Util to avoid a circular import. Fixes #3028.
- Some Python 2 compatibility code dropped
- Rework runtest.py to use argparse for arg handling (was a mix
of hand-coded and optparse, with a stated intent to "gradually port").
- Add options to runtest to generate/not generate a log of failed tests,
and to rerun such tests. Useful when an error cascades through several
tests, can quickly try if a change improves all the fails. Dropped
runtest test for fallback from qmtest, not needed; added new tests.
- Eliminate tex tool usage of "for foo in range(len(iterable))"
- Restore internal Trace function to functional state.
- Only try to initialize the wix tool by default (or when tool `default` is explicitly installed)
on Windows based systems.
- Pick a better "Topic" Trove classifier for SCons: SW Dev / Build Tools
- Use os.replace instead of os.rename in dblite so don't need to
special-case Windows here. dblite is the default storage engine for the SConsign file(s).
- Fix cut-n-paste error in msvc debug printout and make some debug output
in msvs and msvsTests.py be off until needed (uncomment to use)
- Fix Issue #3014 - Empty file and missing file have same csig
- Refactor env.Append/Prepend to remove Py 1.5 era need to nest
try blocks, can now "continue" at the appropriate places.
- Add /snap/bin to env['PATH'] on POSIX, although this is only
really useful for a subset of POSIX systems that use snaps.
Was needed for CI builds, which run on Ubuntu LTS images.
- Eliminate Py2-ism __nonzero__ (now __bool__). Work around issue #3860
where a check for BuilderBase raising exc. on __bool__ was optimized out.
This issue was found due to a bug in Python 3.10.0a4. See issue #3860 for details.
RELEASE 4.0.1 - Mon, 16 Jul 2020 16:06:40 -0700
From Rob Boehne:
- Fix fortran tools to set SHFORTRAN variables to $FORTRAN, similarly SHF77, SHF90, SHF95,
SHF03 and SHF08 will default to the variables $F77, $F90, $F95, $F03 and $F08 respectively.
If you were depending on changing the value of FORTRAN (or $F[0-9][0-9]) having no effect
on the value of SHFORTRAN, this change will break that. The values of FORTRAN, F77, F90,
F95, F03, F08 and SHFORTRAN, SHF77 (etc.) now are not overridden in generate if alredy set
by the user.
- Fix subprocess execution of 'lslpp' on AIX to produce text standard i/o.
- Re-do the fix for suncxx tool (Oracle Studio compiler) now that only Python 3 is supported,
to avoid decoding errors.
From William Deegan:
- Added Environment() variable TEMPFILEDIR which allows setting the directory which temp
files createdby TEMPFILEMUNGE are created in.
From Daniel Moody:
- Added method on Node to test if its node used in SConf. (Github Issue #3626)
RELEASE 4.0.0 - Sat, 04 Jul 2020 12:00:27 +0000
From Dirk Baechle:
- Updated documentation toolchain to work properly under Python3, also
removed libxslt support from the Docbook Tool. (issue #3580)
- Added Docker images for building and testing SCons. (issue #3585)
From James Benton:
- Improve Visual Studio solution/project generation code to add support
for a per-variant cppflags. Intellisense can be affected by cppflags,
this is especially important when it comes to /std:c++* which specifies
what C++ standard version to target. SCons will append /Zc:__cplusplus
to the project's cppflags when a /std:c++* flag is found as this is
required for intellisense to use the C++ standard version from cppflags.
From Rob Boehne
- Specify UTF-8 encoding when opening Java source file as text. By default, encoding is the output
of locale.getpreferredencoding(False), and varies by platform.
From Joseph Brill:
- MSVC updates: When there are multiple product installations (e.g, Community and
Build Tools) of MSVC 2017 or MSVC 2019, an Enterprise, Professional,
or Community installation will be selected before a Build Tools installation when
"14.1" or "14.2" is requested, respectively. (GH Issue #3699).
- MSVC updates: When there are multiple product installations of MSVC 2017 (e.g.,
Community and Express), 2017 Express is no longer returned when "14.1" is
requested. Only 2017 Express will be returned when "14.1Exp" is requested.
(GH Issue #3699).
- MSVC updates: An MSVC 6.0 installation now appears in the installed versions list
when msvc debug output is enabled (GH Issue #3699).
- MSVS test updates: Tests for building a program using generated MSVS project and
solution files using MSVS 2015 and later now work as expected on x86 hosts.
- Test update: Reduce the number of "false negative" test failures for the interactive
configuration test (test/interactive/configure.py).
- MSVS update: Fix the development environment path for MSVS 7.0.
From William Deegan:
- Fix broken clang + MSVC 2019 combination by using MSVC configuration logic to
propagate'VCINSTALLDIR' and 'VCToolsInstallDir' which clang tools use to locate
header files and libraries from MSVC install. (Fixes GH Issue #3480)
- Added C:\msys64\mingw64\bin to default mingw and clang windows PATH's. This
is a reasonable default and also aligns with changes in Appveyor's VS2019 image.
- Drop support for Python 2.7. SCons will be Python 3.5+ going forward.
- Change SCons.Node.ValueWithMemo to consider any name passed when memoizing Value() nodes
- Fix Github Issue #3550 - When using Substfile() with a value like Z:\mongo\build\install\bin
the implementation using re.sub() would end up interpreting the string and finding regex escape
characters where it should have been simply replacing existing text. Switched to use string.replace().
- Fix Github Issue #2904 - Provide useful error message when more than one Configure Contexts are opened.
Only one open is allowed. You must call conf.Finish() to complete the currently open one before creating another
- Add msys2 installed mingw default path to PATH for mingw tool.
- C:\msys64\mingw64\bin
- Purge obsolete internal build and tooling scripts
- Allow user specified location for vswhere.exe specified by VSWHERE.
NOTE: This must be set at the time the 'msvc' 'msvs' and/or 'mslink' tool(s) are initialized to have any effect.
- Resolve Issue #3451 and Issue #3450 - Rewrite SCons setup.py and packaging. Move script logic to entry points so
package can create scripts which use the correct version of Python.
- Resolve Issue #3248 - Removing '-Wl,-Bsymbolic' from SHLIBVERSIONFLAGS
NOTE: If your build depends on the above you must now add to your SHLIBVERSIONFLAGS
- Speedup bin/docs-update-generated by caching parsed docbook schema. (60x speedup)
- Reorganized source tree. Moved src/engine/SCons to SCons to be more in line with current Python source
tree organization practices.
- Renamed as.py to asm.py and left redirecting tool. 'as' is a reserved word and so
changing the name was required as we wanted to import symbols for use in compilation_db
tool.
- Add CompilationDatabase() builder in compilation_db tool. Contributed by MongoDB.
Setting COMPILATIONDB_USE_ABSPATH to True|False controls whether the files are absolute or relative
paths. Address Issue #3693 and #3694 found during development.
- Fixed Github Issue 3628 - Hardcoding pickle protocol to 4 (supports python 3.4+)
and skipping Python 3.8's new pickle protocol 5 whose main advantage is for out-of-band data buffers.
NOTE: If you used Python 3.8 with SCons 3.0.0 or above, you may get a a pickle protocol error. Remove your
.sconsign.dblite. You will end up with a full rebuild.
From Andrii Doroshenko:
- Extended `Environment.Dump()` to select a format to serialize construction variables (pretty, json).
From Jeremy Elson:
- Updated design doc to use the correct syntax for Depends()
From Adam Gross:
- Added support for scanning multiple entries in an action string if
IMPLICIT_COMMAND_DEPENDENCIES is set to 2 or 'all'. This enables more thorough
action scanning where every item in each command line is scanned to determine
if it is a non-source and non-target path and added to the list of implicit dependencies
for the target.
- Added support for taking instances of the Value class as implicit
dependencies.
- Added new module SCons.Scanner.Python to allow scanning .py files.
- Added support for explicitly passing a name when creating Value() nodes. This may be useful
when the value can't be converted to a string or if having a name is otherwise desirable.
- Fixed usage of abspath and path for RootDir objects on Windows. Previously
env.fs.Dir("T:").abspath would return "T:\T:" and now it correctly returns "T:".
From Ivan Kravets, PlatformIO
- New conditional C Scanner (`SCons.Scanner.C.CConditionalScanner()`)
which interprets C/C Preprocessor conditional syntax (#ifdef, #if, #else,
#elif, #define, etc.)
- Improvements for virtual C Pre-Processor:
* Handle UNSIGNED LONG and LONG numeric constants in DEC (keep support for HEX)
* Skip unrecognized directives, such as `#if( defined ...)`
* Ignore `#include DYNAMIC_INCLUDE` directive that depends on a dynamic
macro which is not located in a state TABLE.
* Cleanup CPP expressions before evaluating (strip comments, carriage returns)
From Iosif Kurazs:
- Added a new flag called "linedraw" for the command line argument "--tree"
that instructs scons to use single line drawing characters to draw the dependency tree.
From Daniel Moody:
- Add no_progress (-Q) option as a set-able option. However, setting it in the
SConstruct/SConscript will still cause "scons: Reading SConscript files ..." to be
printed, since the option is not set when the build scripts first get read.
- Added check for SONAME in environment to setup symlinks correctly (Github Issue #3246)
- User callable's called during substition expansion could possibly throw a TypeError
exception, however SCons was using TypeError to detect if the callable had a different
signature than expected, and would silently fail to report user's exceptions. Fixed to
use signature module to detect function signature instead of TypeError. (Github Issue #3654)
- Added storage of SConstructs and SConscripts nodes into global set for checking
if a given node is a SConstruct/SConscript.
Added new node function SCons.Node.is_sconscript(self) (Github Issue #3625)
From Andrew Morrow:
- Fix Issue #3469 - Fixed improper reuse of temporary and compiled files by Configure when changing
the order and/or number of tests. This is done by using the hash of the generated temporary files
content and (For the target files) the hash of the action.
So where previously files would be named:
- config_1.c, config_1.o, config_1
The will now be named (For example)
- conftest_68b375d16e812c43e6d72d6e93401e7c_0.c,
conftest_68b375d16e812c43e6d72d6e93401e7c_0_5713f09fc605f46b2ab2f7950455f187.o
or
conftest_68b375d16e812c43e6d72d6e93401e7c_0.o
conftest_68b375d16e812c43e6d72d6e93401e7c_0_5713f09fc605f46b2ab2f7950455f187 (for executable)
From Mathew Robinson:
- Improve performance of Subst by preventing unnecessary frame
allocations by no longer defining the *Subber classes inside of their
respective function calls.
- Improve performance of Subst in some cases by preventing
unnecessary calls to eval when a token is surrounded in braces
but is not a function call.
- Improve performance of subst by removing unnecessary recursion.
- Cleanup dangling symlinks before running builders (Issue #3516)
From Mats Wichmann:
- Remove deprecated SourceCode
- str.format syntax errors fixed
- a bunch of linter/checker syntax fixups
- Convert remaining uses of insecure/deprecated mktemp method.
- Clean up some duplications in manpage. Clarify portion of manpage on Dir and File nodes.
- Reduce needless list conversions.
- Fixed regex in Python scanner.
- Accommodate VS 2017 Express - it's got a more liberal license then VS
Community, so some people prefer it (from 2019, no more Express)
- vswhere call should also now work even if programs aren't on the C: drive.
- Add an alternate warning message if cl.exe is not found and msvc config
cache is in use (SCONS_CACHE_MSVC_CONFIG was given) - config cache
may be out of date.
- Fixed bug where changing TEXTFILESUFFIX would cause Substfile() to rebuild. (Github Issue #3540)
- Script/Main.py now uses importlib instead of imp module.
- Drop some Python 2-isms.
- MSVC updates: pass on VSCMD_DEBUG and VSCMD_SKIP_SENDTELEMETRY to msvc
tool setup if set in environment. Add Powershell to default env
(used to call telemetry script).
- Microsoft Visual Studio - switch to using uuid module to generate GUIDs rather than hand rolled
method using md5 directly.
NOTE: This change affects the following builders' output. If your build depends on the output of these builders
you will likely see a rebuild.
* Package() (with PACKAGETYPE='msi')
* MSVSSolution()
* MSVSProject()
- Docbook builder provides a fallback if lxml fails to generate
a document with tostring().
- Fix description of ARCOMSTR constr. var. (issue 3636). Previously the text was a copy of ASCOMSTR which
has different function.
- Update xml files in SCons to reflect changed relative paths after
code restructuring (src/engine/SCons -> SCons)
- Preliminary Python 3.9 support - elimination of some warnings.
- Drop the with_metaclass jig which was designed to let class
definitions using a metaclass be written the same for Py2/Py3.
- Bump python_version_unsupported (and deprecated) to indicate 3.5
is lowest supported Python.
- ParseFlags should not modify the user's passed in dict in case it's
a compound data structure (e.g. values are lists) (issue #3665)
- In Py3 classes no longer need to be listed as deriving from object.
- Remove deprecated check for Task subclasses needing a needs_execute
method - this is now enforced via an abstract base class, so the
check and test is no longer needed.
- Close various logfiles (trace, cache, taskmastertrace, configure)
when done using atexit calls.
- Rebase forked copy of shutil.copytree to Python 3.7 stlib version.
- Significant rework of documentation: API docs are now generated
using Sphinx; manpage and user guide now use more "standard"
markup elements (which could facilitate later conversion to a
different doc format, should that choice be made); significant
rewordings in manpage. Manpage Examples moved to an external
repository / website (scons-cookbook.readthedocs.io).
- Clean up test harness and tests' use of subdir, file_fixture and
dir_fixture.
- SubstitutionEnvironment and OverrideEnvironment now have keys()
and values() methods to better emulate a dict (already had items()).
- Rename internal Warning base class to SConsWarning to avoid any
possible confusion with Python's own Warning class.
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.
- Added memoization support for calls to Environment.Value() in order to
improve performance of repeated calls.
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:
- Remove obsoleted references to DeciderNeedsNode which could cause crash when using --debug=explain
From Jason Kenny
- Add Fix and test for crash in 3.1.0 when using Decider('MD5-timestamp') and --debug=explain
From Ben Reed:
- Added -fmerge-all-constants to flags that get included in both CCFLAGS and LINKFLAGS.
From Mathew Robinson:
- Fix issue #3415 - Update remaining usages of EnvironmentError to SConsEnvironmentError
this patch fixes issues introduced in 3.1.0 where any of the
following would cause SCons to error and exit:
- CacheDir not write-able
- JSON encoding errors for CacheDir config
- JSON decoding errors for CacheDir config
RELEASE 3.1.0 - Mon, 20 Jul 2019 16:59:23 -0700
From Joseph Brill:
- Code to supply correct version-specifier argument to vswhere for
VS version selection.
From William Deegan:
- Enhanced --debug=explain output. Now the separate components of the dependency list are split up
as follows:
scons: rebuilding `file3' because:
the dependency order changed:
->Sources
Old:xxx New:zzz
Old:yyy New:yyy
Old:zzz New:xxx
->Depends
->Implicit
Old:/usr/bin/python New:/usr/bin/python
- Fix Issue #3350 - SCons Exception EnvironmentError is conflicting with Python's EnvironmentError.
- Fix spurious rebuilds on second build for cases where builder has > 1 target and the source file
is generated. This was causing the > 1th target to not have it's implicit list cleared when the source
file was actually built, leaving an implicit list similar to follows for 2nd and higher target
['/usr/bin/python', 'xxx', 'yyy', 'zzz']
This was getting persisted to SConsign and on rebuild it would be corrected to be similar to this
['zzz', 'yyy', 'xxx', '/usr/bin/python']
Which would trigger a rebuild because the order changed.
The fix involved added logic to mark all shared targets as peers and then ensure they're implicit
list is all cleared together.
- Fix Issue #3349 - SCons Exception EnvironmentError is conflicting with Python's EnvironmentError.
Renamed to SConsEnvironmentError
- Fix Issue #3350 - mslink failing when too many objects. This is resolved by adding TEMPFILEARGJOIN variable
which specifies what character to join all the argements output into the tempfile. The default remains a space
when mslink, msvc, or mslib tools are loaded they change the TEMPFILEARGJOIN to be a line separator (\r\n on win32)
- Fix performance degradation for MD5-timestamp decider. NOTE: This changes the Decider() function arguments.
From:
def my_decider(dependency, target, prev_ni):
To:
def my_decider(dependency, target, prev_ni, repo_node):
Where repo_node is the repository (or other) node to use to check if the node is out of date instead of dependency.
From Peter Diener:
- Additional fix to issue #3135 - Also handle 'pure' and 'elemental' type bound procedures
- Fix issue #3135 - Handle Fortran submodules and type bound procedures
From Adam Gross:
- Upgraded and improved Visual Studio solution/project generation code using the MSVSProject builder.
- Added support for Visual Studio 2017 and 2019.
- Added support for the following per-variant parameters to the builder:
- cpppaths: Provides per-variant include paths.
- cppdefines: Provides per-variant preprocessor definitions.
From Michael Hartmann:
- Fix handling of Visual Studio Compilers to properly reject any unknown HOST_PLATFORM or TARGET_PLATFORM
From Bert Huijben:
- Added support for Visual Studio 2019 toolset.
From Mathew Robinson:
- Update cache debug output to include cache hit rate.
- No longer unintentionally hide exceptions in Action.py
- Allow builders and pseudo-builders to inherit from OverrideEnvironments
From Leonard de Ruijter:
- Add logic to derive correct version argument to vswhere
From Lukas Schrangl:
- Enable LaTeX scanner to find more than one include per line
From Sergey Torokhov:
- Recognize jdk on Gentoo systems.
From Mats Wichmann:
- scons-time takes more care closing files and uses safer mkdtemp to avoid
possible races on multi-job runs.
- Use importlib to dynamically load tool and platform modules instead of imp module
- sconsign: default to .sconsign.dblite if no filename is specified.
Be more informative in case of unsupported pickle protocol (py2 only).
- Fix issue #3336 - on Windows, paths were being added to PATH even if
tools were not found in those paths.
- More fixes for newer Java versions (since 9): handle new jdk directory
naming (jdk-X.Y instead of jdkX.Y) on Windows; handle two-digit major
version. Docstrings improved.
- Fixups for pylint: exception types, redefined functions,
globals, etc. Some old code removed to resolve issues (hashlib is
always present on modern Pythons; no longer need the code for
2.5-and-earlier optparse). cmp is not a builtin function in Py3,
drop one (unused) use; replace one. Fix another instance of
renaming to SConsEnvironmentError. Trailing whitespace.
Consistently use not is/in (if not x is y -> if x is not y).
- Add a PY3-only function for setting up the cachedir that should be less
prone to races. Add a hack to the PY2 version (from Issue #3351) to
be less prone to a race in the check for old-style cache.
- Fix coding error in docbook tool only exercised when using python lxml
- Recognize two additional GNU compiler header directory options in
ParseFlags: -iquote and -idirafter.
- Fix more re patterns that contain \ but not specified as raw strings
(affects scanners for D, LaTeX, swig)
RELEASE 3.0.5 - Mon, 26 Mar 2019 15:04:42 -0700
From William Deegan:
- Fix Issue #3283 - Handle using --config=force in combination with Decider('MD5-timestamp').
3.0.2 in fix for issue #2980 added that deciders can throw DeciderNeedsNode exception.
The Configure logic directly calls the decider when using --config=force but wasn't handling
that exception. This would yield minimally configure tests using TryLink() not running and
leaving TypeError Nonetype exception in config.log
- Fix Issue #3303 - Handle --config=force overwriting the Environment passed into Configure()'s
Decider and not clearing it when the configure context is completed.
- Add default paths for yacc tool on windows to include cygwin, mingw, and chocolatey
- Fix issue #2799 - Fix mingw tool to respect SHCCCOMSTR, SHLINKCOMSTR and LDMODULECOMSTR
- Fix Issue #3329 - Add support for MS SDK V10.0A (which is commonly installed with VS2017)
- Fix Issue #3333 - Add support for finding vswhere under 32 bit windows installs.
From Maciej Kumorek:
- Update the MSVC tool to include the nologo flag by default in RCFLAGS
From Daniel Moody:
- Change the default for AppendENVPath to delete_existing=0, so path
order will not be changed, unless explicitly set (Issue #3276)
- Fixed bug which threw error when running SCons on windows system with no MSVC installed.
- Update link tool to convert target to node before accessing node member
- Update mingw tool to remove MSVC like nologo CCFLAG
- Add default paths for lex tool on windows to include cygwin, mingw, and chocolatey
- Add lex construction variable LEXUNISTD for turning off unix headers on windows
- Update lex tool to use win_flex on windows if available
From Mats Wichmann:
- Quiet open file ResourceWarnings on Python >= 3.6 caused by
not using a context manager around Popen.stdout
- Add the textfile tool to the default tool list
- Fix syntax on is/is not clauses: should not use with a literal
- Properly retrieve exit code when catching SystemExit
- scons-time now uses context managers around file opens
- Fix regex patterns that were not specified as raw strings
From Bernhard M. Wiedemann:
- Do not store build host+user name if reproducible builds are wanted
RELEASE 3.0.4 - Mon, 20 Jan 2019 22:49:27 +0000
From Mats Wichmann:
- Improve finding of Microsoft compiler: add a 'products' wildcard
in case 2017 Build Tools only is installed as it is considered a separate
product from the default Visual Studio
- Add TEMPFILESUFFIX to allow a customizable filename extension, as
described in the patch attached to issue #2431.
- scons.py and sconsign.py stopped working if script called as a symlink
to location in scons-local location.
- Fix issue running scons using a symlink to scons.py in an scons-local dir
- Doc updates around Default(), and the various *TARGETS variables.
From Daniel Moody:
- Improved support for VC14.1 and Visual Studio 2017, as well as arm and arm64 targets.
Issues #3268 & Issue #3222
- Initial support for ARM targets with Visual Studio 2017 - Issue #3182 (You must set TARGET_ARCH for this to work)
- Update TempFileMunge class to use PRINT_CMD_LINE_FUNC
From Tobias Herzog
- Enhance cpp scanner regex logic to detect if/elif expressions without whitespaces but
parenthesis like "#if(defined FOO)" or "#elif!(BAR)" correctly.
RELEASE 3.0.3 - Mon, 07 Jan 2019 20:05:22 -0400
NOTE: 3.0.2 release was dropped because there was a packaging bug. Please consider all 3.0.2
content.
From William Deegan:
- Fixes to packaging logic. Ensuring the SCons.Tool.clangCommon module is added
to the release packages.
- Modify scons.bat script to check for scons python script without .py extension if no file
scons.py exists. This enables an all platform wheel to work.
From Mats Wichmann:
- Update doc examples to work with Python 3.5+: map() now returns an iterable instead of a list.
RELEASE 3.0.2 - Mon, 31 Dec 2018 16:00:12 -0700
From Bernard Blackham:
- Fixed handling of side-effects in task master (fixes #3013).
From William Deegan:
- Remove long deprecated SCons.Options code and tests. This removes BoolOption,EnumOption,
ListOption,PackageOption, and PathOption which have been replaced by *Variable() many years ago.
- Re-Enable parallel SCons (-j) when running via Pypy
- Move SCons test framework files to testing/framework and remove all references to QMtest.
QMTest has not been used by SCons for some time now.
- Updated logic for mingw and clang on win32 to search default tool install paths if not
found in normal SCons PATH. If the user specifies PATH or tool specific paths they
will be used and the default paths below will be ignored.
- Default path for clang/clangxx : C:\Program Files\LLVM\bin
- Default path for mingw : C:\MinGW\bin and/or C:\mingw-w64\*\mingw64\bin
- Key program to locate mingw : mingw32-make (as the gcc with mingw prefix has no fixed name)
- Fixed issue causing stack trace when python Action function contains a unicode string when being
run with Python 2.7
- Add alternate path to QT install for Centos in qt tool: /usr/lib64/qt-3.3/bin
- Fix Java tools to search reasonable default paths for Win32, Linux, macOS. Add required paths
for swig and java native interface to JAVAINCLUDES. You should add these to your CPPPATH if you need
to compile with them. This handles spaces in paths in default Java paths on windows.
- Added more java paths to match install for Centos 7 of openjdk
- Fix new logic which populates JAVAINCLUDES to handle the case where javac is not found.
- Fix GH Issue #2580 - # in FRAMEWORKPATH doesn't get properly expanded. The # is left in the
command line.
- Fix issue #2980 with credit to Piotr Bartosik (and William Blevins). This is an issue where using
TimeStamp-MD5 Decider and CacheDir can yield incorrect md5's being written into the .sconsign.
The difference between Piotr Bartosik's patch and the current code is that the more complicated
creation of file to csig map is only done when the count of children for the current node doesn't
match the previous count which is loaded from the sconsign.
- Fix issue # 3106 MSVC if using MSVC_BATCH and target dir had a space would fail due to quirk in
MSVC's handling of escaped targetdirs when batch compiling.
- Fix GH Issue #3141 unicode string in a TryAction() with python 2.7 crashes.
- Fix GH Issue #3212 - Use of Py3 and CacheDir + Configure's TryCompile (or likely and Python Value Nodes)
yielded trying to combine strings and bytes which threw exception.
- Fix GH Issue #3225 SCons.Util.Flatten() doesn't handle MappingView's produced by dictionary as return
values from dict().{items(), keys(), values()}.
- Fix GH Issue #3241 - Properly support versioned shared libraries for MacOS. We've also introduced two
new env variables APPLELINK_CURRENT_VERSION and APPLELINK_COMPATIBILITY_VERSION which will specify
what is passed to the linkers -current_version and -compatibility_version flags. If not specified
they will be derived from SHLIBVERSION as such:
- APPLELINK_CURRENT_VERSION = SHLIBVERSION
- APPLELINK_COMPATIBILITY_VERSION = all but the last digit in SHLIBVERSION with .0 appended.
Note that the values of the above will be validated. Valid format for either APPLELINK variable is
X[.Y[.Z]] where 0 <= X <= 65535, 0 <= Y <= 255, 0 <= Z <= 255.
The new variables have been added to the documents and should show up in user guide and manpage.
- Fix GH Issue #3136 no longer wrap io.{BufferedReader,BufferedWriter,BufferedRWPair,BufferedRandom,TextIOWrapper
with logic to set HANDLE_FLAG_INHERIT flag on the file handle. Python 3.4+ automatically sets this according
to Python docs: https://docs.python.org/3/library/os.html#fd-inheritance
From Ray Donnelly:
- Fix the PATH created by scons.bat (and other .bat files) to provide a normalized
PATH. Some pythons in the 3.6 series are no longer able to handle paths which
have ".." in them and end up crashing. This is done by cd'ing into the directory
we want to add to the path and then using %CD% to give us the normalized directory
See bug filed under Python 3.6: https://bugs.python.org/issue32457.
Note: On Win32 PATH's which have not been normalized may cause undefined behavior
by other executables being run by SCons (or any subprocesses of executables being run by SCons).
Resolving this issue should eliminate that possibility going forward.
From Andrew Featherstone
- Removed unused --warn options from the man page and source code.
From Arda Fu
- Fix cpp scanner regex logic to treat ifndef for py3.5+. Previously it was
not properly differentiating between if, ifdef, and ifndef.
From Philipp Maierhöfer
- Added a __hash__ method to the class SCons.Subst.Literal. Required when substituting Literal
objects when SCons runs with Python 3.
- Added missing FORTRANMODDIRPREFIX to the gfortran tool.
From Matthew Marinets:
- Fixed an issue that caused the Java emitter to incorrectly parse arguments to constructors that
implemented a class.
From Fredrik Medley:
- Fix exception when printing of EnviromentError messages.
Specifically, this fixes error reporting of the race condition when
initializing the cache which error previously was hidden.
From Daniel Moody:
- Updated Jar builder to handle nodes and directories better
- Updated Jar builder to flatten source list which could contain embedded lists
- Removed some magic numbers from jar.py on behalf of Mats Wichmann ([email protected])
- Set the pickling protocal back to highest which was causing issues
with variant dir tests. This will cause issues if reading sconsigns
pickled with the previous lower protocol.
- Updated swig to setup default paths for windows
- Updated gettext tools to setup default paths for windows with Cygwin/MinGW setups
- Add common location for default paths for cygwin and mingw in Platform modules
- Updated YACC tool to work on windows with Cygwin/MinGW setups
- Set the pickling protocal back to highest which was causing issues
with variant dir tests. This will cause issues if reading sconsigns
pickled with the previous lower protocol.
- Updated FS.py to handle removal of splitunc function from python 3.7
- Updated the vc.py to ignore MSVS versions where no compiler could be found
From Gary Oberbrunner:
- Fix bug when Installing multiple subdirs outside the source tree
- fix to_str to handle None without raising exception
- Fix -jN for python 3.7
From Jonathon Reinhart:
- Replace all instances of `int main()` in C code with `int main(void)`.
Specifically, this fixes the test cases use by Configure.CheckCC() which
would fail when using -Wstrict-prototypes.
From Zachary Tessler:
- Fix calculation of signatures for FunctionActions that contain list (or set,...)
comprehensions whose expressions involve constant literals. Those constants had
been ignored in signatures, so changing them did not cause targets to be rebuilt.
From Paweł Tomulik:
- In the testing framework, module TestCommon, fixed must_contain(),
must_not_contain(), and related methods of TestCommon class to work with
substrings located at zero offset.
- Added virtualenv support. A new function Virtualenv() determines whether
SCons runs in a virtualenv. The search PATH may also be extended to
prefer executables from the current virtualenv over the ones provided by
base environment. New option --enable-virtualenv provided to import some
virtualenv-related variables to SCons and extend every env['ENV']['PATH']
automatically. New option --ignore-virtualenv disables this. Two