Re: [Scons-dev] SCons 4.0.0 Released

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 <[email protected]>
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 <[email protected]>
> 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 <[email protected]>
>> 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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