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If you are reading this in the git repository, the contents
refer to *unreleased* changes since the last SCons release.
Past official release announcements appear at:
https://scons.org/tag/releases.html
==================================================================
A new SCons release, 4.4.1, is now available on the SCons download page:
https://scons.org/pages/download.html
Here is a summary of the changes since 4.4.0:
NOTE: If you build with Python 3.10.0 and then rebuild with 3.10.1 (or higher), you may
see unexpected rebuilds. This is due to Python internals changing which changed
the signature of a Python Action Function.
NEW FUNCTIONALITY
-----------------
- Added ValidateOptions() which will check that all command line options are in either
those specified by SCons itself, or by AddOption() in SConstruct/SConscript. It should
not be called until all AddOption() calls are completed. Resolves Issue #4187
- Added --experimental=tm_v2, which enables Andrew Morrow's NewParallel Job implementation.
This should scale much better for highly parallel builds. You can also enable this via SetOption().
DEPRECATED FUNCTIONALITY
------------------------
- List anything that's been deprecated since the last release
CHANGED/ENHANCED EXISTING FUNCTIONALITY
---------------------------------------
- Added -fsanitize support to ParseFlags(). This will propagate to CCFLAGS and LINKFLAGS.
- Calling EnsureSConsVersion() and EnsurePythonVersion() won't initialize
DefaultEnvironment anymore.
- The console message from the Chmod() action function now displays
octal modes using the modern Python syntax (0o755 rather than 0755).
- Migrated logging logic for --taskmastertrace to use Python's logging module. Added logging
to NewParallel Job class (Andrew Morrow's new parallel job implementation)
- Preliminary support for Python 3.12.
- Run LaTeX after biber/bibtex only if necessary
- Configure context methods CheckLib and CheckLibWithHeader now expose
two additional keyword arguments: 'append', which controls whether to append
(the default) or prepend discovered libraries to $LIBS, and 'unique',
which controls whether to add the library if it is already in the $LIBS
list. This brings the library-adding functionality in Configure in line
with the regular Append, AppendUnique, Prepend and PrependUnique methods.
FIXES
-----
- Added missing newline to generated compilation database (compile_commands.json)
- A list argument as the source to the Copy() action function is now handled.
Both the implementation and the strfunction which prints the progress
message were adjusted.
- The Java Scanner processing of JAVACLASSPATH for dependencies (behavior
that was introduced in SCons 4.4.0) is adjusted to split on the system's
search path separator instead of on a space. The previous behavior meant
that a path containing spaces (e.g. r"C:\somepath\My Classes") would
lead to unexpected errors. If the split-on-space behavior is desired,
pre-split the value: instead of: env["JAVACLASSPATH"] = "foo bar baz"
use: env["JAVACLASSPATH"] = env.Split("foo bar baz")
There is no change in how JAVACLASSPATH gets turned into the -classpath
argument passed to the JDK tools.
- Ninja: Fix execution environment sanitation for launching ninja. Previously if you set an
execution environment variable set to a python list it would crash. Now it
will create a string joining the list with os.pathsep
- Fixed command line argument --diskcheck: previously a value of 'none' was ignored.
SetOption('diskcheck','none') is unaffected, as it did not have the problem.
- Fixed Issue #4275 - when outputting compilation db and TEMPFILE was in use, the compilation db would have
command lines using the generated tempfile for long command lines, instead of the full command line for
the compilation step for the source/target pair.
- A refactor in the caching logic for version 4.4.0 left Java inner classes
failing with an exception when a CacheDir was enabled. This is now corrected.
- When using the gfortran tool (the default on most platforms as long as a GNU
toolchain is installed), the user setting of the "dialect" compilers
(F77, F90, F03 and F09, as well as the shared-library equivalents SHF77,
SHF90, SHF03, SHF09) is now honored; previously the tool overwrote the
settings to 'gfortran', which made it difficult reference a cross-compile
version for dialects.
- Fix issue #2757, where Configure checks that perform a check which reads a modified source
(including program, source or header file(s)) would incorrectly mark that file "up to date" so the
actual build would not see the file as modified. Leading to incorrect incremental builds.
Now configure checks now clear node info for non conftest nodes, so they will be re-evaluated for
the real taskmaster run when the build commences.
IMPROVEMENTS
------------
- Changed the Taskmaster trace logic to use python's logging module.
- Add cache-debug messages for push failures.
- Added error message to handle the case when SCons attempts to retrieve all the targets
for a specified builder from the CacheDir, fails to do so, and then runs into an error
when deleting the files which were retrieved. Previously if this happened there were no
errors or warnings.
PACKAGING
---------
- SCons now has three requirements files: requirements.txt describes
requirements to run scons; requirements-dev.txt requirements to
develop it - mainly things needed to run the testsuite;
requirements_pkg.txt are the requirements to do a full build
(including docs build) with an intent to create the packages.
- Moved rpm and debian directories under packaging
- Added logic to help packagers enable reproducible builds into packaging/etc/.
Please read packaging/etc/README.txt if you are interested.
- A zipapp of scons-local is now also built.
DOCUMENTATION
-------------
- Updated the --hash-format manpage entry.
- EnsureSConsVersion, EnsurePythonVersion, Exit, GetLaunchDir and
SConscriptChdir are now listed as Global functions only.
- Updated the docs for Glob.
- Updated SHELL_ENV_GENERATORS description and added versionadded indicator.
- JAVABOOTCLASSPATH, JAVACLASSPATH and JAVASOURCEPATH better document the
acceptable syntax for values, and how they will be interpreted,
including that JAVACLASSPATH will be scanned for dependencies.
Added note on the possibly surprising feature that SCons always passes
-sourcepath when calling javac, which affects how the class path is
used when finding sources.
- Updated the User Guide chapter on installation: modernized the notes
on Python installs, SCons installs, and having multiple SCons versions
present on a single system.
- Updated the User Guide chapter on variant directories with more
explanation, and the introduction of terms like "out of tree" that
may help in forming a mental model.
- Additional explanations for MSVSProject and MSVSSolution builders.
- Updated MSVC documentation - adds "version added" annotations on recently
added construction variables and provides a version-mapping table.
DEVELOPMENT
-----------
- Refactored SCons/Taskmaster into a package. Moved SCons/Jobs.py into that package.
NOTE: If you hook into SCons.Jobs, you'll have to change that to use SCons.Taskmaster.Jobs
- Refactored SCons.Util, which had grown quite large, to be a package,
not a single-file module. Change should be transparent: the same import
of SCons.Util and public symbols from it will continue to work, however
code which reaches directly in to grab private symbols (starting with
underscore) which moved to a submodule, that code will have to be adjusted,
as those are not imported to the package level (new SCons.Util.hashes has
some of these, which are used by existing unit tests).
- Added overrides argument to SCons.Subst.scons_subst(), subst_list(), subst(), and Action's process(),
strfunction(). This allows passing a dictionary of envvars to override when evaluating subst()'d strings/lists
Thanks to the following contributors listed below for their contributions to this release.
==========================================================================================
.. code-block:: text
git shortlog --no-merges -ns 4.4.0..HEAD
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