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

Bill Deegan bill at baddogconsulting.com
Sun Jul 5 11:54:52 EDT 2020


Thanks!
Well at least there's an easy work around for now.

On Sun, Jul 5, 2020 at 7:30 AM Eric Fahlgren <ericfahlgren at gmail.com> wrote:

> Bill,
>
> Issue filed along with some further experiments.
> https://github.com/SCons/scons/issues/3736
>
> I vaguely remember playing with the case-sensitivity options in Windows on
> this machine years ago, so I tested everything on another machine where
> Windows is pristine, but no joy, same issue presented in the same manner
> there, too.
>
> Eric
>
> On Sat, Jul 4, 2020 at 9:48 PM Bill Deegan <bill at baddogconsulting.com>
> wrote:
>
>> 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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>>>>
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