Meta: Native Windows support

[tobiasdiez]

This issue tracks support for the native build on Windows.

Missing Windows support of dependencies

• m4rie: upstream (https://github.com/malb/m4rie) doesn't provide win build
• ec: not sure if upstream (https://github.com/JohnCremona/eclib) provide win build
• ecm: upstream (https://gitlab.inria.fr/zimmerma/ecm) doesn't provide native win build (only Cygwin)
• ntl: upstream provides win build (kind of), but it's not yet available on conda (Build for windows with CMake conda-forge/ntl-feedstock#16)
• maxima/ecl: upstream provides win build, but it's not yet available on conda (Windows build conda-forge/maxima-feedstock#38)
• GAP: only cygiwn build exists Thoughts for a native (well, mingw) Window version of GAP gap-system/gap#4157
• cypari2: no windows support yet merge cypari and cypari2 cypari2#19
• lrcalc
• pplpy
• primecountpy
• fpylll
• rw
• cliquer
• lcalc
• ecl
• braiding
• gc
• homfly
• iml
• brial_groebner

Conda Issues:

• Meson cannot find libraries without pkg-config files.
  • Workaround: Check that set LIB includes the conda env (e.g. ...\.conda\envs\sage-dev\Library\lib). If not, run conda deactivate followed by conda activate sage-dev and then check again.
  • Alternatively, set LIB=%CONDA_PREFIX%\Library\lib;%LIB%
  • Possible upstream improvement: the compilers conda package should set LIB
• If you don't have the debug version of Python installed, you may get "LINK : fatal error LNK1104: cannot open file 'python311_d.lib'"
  • Workaround: meson setup builddir -Dbuildtype=release
  • Alternatively, in <path to conda>\sage-dev\include\pyconfig.h uncomment: //# define Py_DEBUG and change python311_d.lib to python311.lib
  • Possible upstream improvement: conda should either ship a debug version of python or a correct pyconfig.h
• When installingc-compiler on Windows, VS 2022 Build Tools init file is not installed conda-forge/compilers-feedstock#66
  • Workaround: Run everything in "VS x64 Native Tools Command Prompt" (for 64bit) or "Developer Command Prompt for VS2022 (or 2019)" (for 32bit)

Related issues

• Meson: raise FeatureNotPresent errors instead of Import errors when dependencies are not available #39412
• Improve flint subproject #40444
• Compile errors in giac with c++ 17 on Windows & MacOS #38985

[soehms]

Concerning GAP see also sagemath/sage-windows#3 (comment) and sagemath/sage-windows#3 (comment).