First, Bill and Mats and everyone else, thanks for your continued
development of SCons!
I ran into a strange, probably Windows-specific issue upon installing
4.0.0. I simply did "pip install scons==4.0.0" without issue, but when I
ran "scons some_target", I got this:
Traceback (most recent call last):
File "c:\program files\python38\lib\runpy.py", line 194, in
_run_module_as_main
return _run_code(code, main_globals, None,
File "c:\program files\python38\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "C:\Program Files\Python38\Scripts\scons.exe\__main__.py", line 4,
in <module>
SCons.Script.main()
ModuleNotFoundError: No module named 'SCons'
It turns out that pip didn't name the installation directory "site-packages/
*SCons*", but rather all-lower-case "site-packages/*scons*" (as it was with
3.1.2), so none of the run commands, scripts or tools will load. I did
"pip uninstall -y scons", made sure Lib/site-packages was clean,
reinstalled 4.0.0 and everything was fine. It appears that pip is not
removing the old installation completely and leaving the top-level
directory there with improper character case, but only when it does an
"install over old". I reproduced this a couple times, reinstalling 3.1 and
then 4.0 over it to confirm.
On Sat, Jul 4, 2020 at 3:57 PM Bill Deegan <b...@baddogconsulting.com>
wrote:
> A new SCons release, 4.0.0, is now available
> on the SCons download page:
>
> https://scons.org/pages/download.html
>
> Here is a summary of the changes since 3.1.2:
>
> NEW FUNCTIONALITY
>
> - 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 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.
> - 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.
> - 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.
> - Extended `Environment.Dump()` to select a format to serialize
> construction variables (pretty, json).
> - New conditional C Scanner (`SCons.Scanner.C.CConditionalScanner()`)
> which interprets C/C Preprocessor conditional syntax (#ifdef, #if,
> #else,
> #elif, #define, etc.)
> - 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.
> - Preliminary Python 3.9 support.
>
> DEPRECATED FUNCTIONALITY
>
> - Drop support for Python 2.7. SCons will be Python 3.5+ going forward.
> - Remove deprecated SourceCode()
>
> CHANGED/ENHANCED EXISTING FUNCTIONALITY
>
> - Added check for SONAME in environment to setup symlinks correctly
> (Github Issue #3246)
> - Resolve Issue #3248 - Removing '-Wl,-Bsymbolic' from
> SHLIBVERSIONFLAGS
> NOTE: If your build depends on the above you must now add to your
> SHLIBVERSIONFLAGS
> - 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()
> - 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.
> - 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.
> - 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.
> - 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: 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).
> - 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 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.
> - Docbook builder provides a fallback if lxml fails to generate
> a document with tostring().
> - SubstitutionEnvironment and OverrideEnvironment now have keys()
> and values() methods to better emulate a dict (already had items()).
>
> FIXES
>
> - Cleanup dangling symlinks before running builders (Issue #3516)
> - 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:".
> - 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)
> - Updated documentation toolchain to work properly under Python3, also
> removed libxslt support from the Docbook Tool. (issue #3580)
> - 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)
> - 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
>
> IMPROVEMENTS
>
> - 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.
>
> PACKAGING
>
> - 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.
>
> DOCUMENTATION
>
> - 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).
>
> Thanks to the following contributors listed below for their
> contributions to this release.
>
> git shortlog --no-merges -ns 3.1.2..HEAD
> 290 William Deegan
> 184 Mats Wichmann
> 46 Adam Gross
> 22 Daniel Moody
> 16 Joseph Brill
> 15 Dirk Baechle
> 12 Ivan Kravets
> 9 Mathew Robinson
> 6 Paul Tipei
> 1 Rob Boehne
> 1 Robert Boehne
> 1 Daniel
> 1 Andrew Morrow
> 1 Iosif Daniel Kurazs
> 1 James Benton
> 1 Jeremy Elson
> 1 Konstantin Gonchar
> 1 Andrii Doroshenko (Xrayez)
> _______________________________________________
> Scons-users mailing list
> scons-us...@scons.org
> https://pairlist4.pair.net/mailman/listinfo/scons-users
>
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