[Scons-dev] [Scons-users] SCons 4.0.0 Released

Bill Deegan bill at baddogconsulting.com
Sun Jul 5 00:47:56 EDT 2020


Eric,

Try pip install SCons==4.0
Does that make a difference?

Packaging has been completely rewritten for 4.0.0 so I'm not surprised
there's an issue or two in the field.
(the previous code was written before there was a pip... ;) and then
duct-taped and bailing wired.. so it needed a rewrite)

Ahh. Interesting because windows is case insensitive..

Please file an Issue.

Hoping to take a break tomorrow and I'll look at it on monday.. unless
someone else feels like taking a wack at fixing that.. ;)

-Bill

On Sat, Jul 4, 2020 at 7:41 PM Eric Fahlgren <ericfahlgren at gmail.com> wrote:

> 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 <bill at 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)
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