add support for cpython-mingw

[mhkline]

I'm adding support for cpython-mingw since there was no wheel available in PyPI. According to the MSYS2 doc:

C extensions are not compatible with the official CPython, which means pip can't use binary wheels from PyPI and packages have to be build when installing them.

The source build did not work in mingw because it wasn't expecting to use gcc from a windows environment.

There is one ugly hack due to cpython-mingw butchering the path names in a windows-posix conversion. This is only necessary if building from a mingw shell using os.name=nt python. If using os.name=posix python (like that installed by MSYS2 with pacman -S python), the hack is unnecessary (and also won't be applied).

[flit]

Thank you! 🙏🏽

Do you know how/if wheels for mingw can be built with cibuildwheel? I'd like to be able to release mingw wheels straight from CI.

[mhkline]

You're welcome!

Do you know how/if wheels for mingw can be built with cibuildwheel? I'd like to be able to release mingw wheels straight from CI.

I've never used cibuildwheel before, but I did take a quick look. It's not obvious that mingw_x86_64 is a supported platform.

I think in order to build a compatible wheel for mingw64, you need an environment with cpython-mingw, gcc, etc. I don't know the exact capabilities of cibuildwheel. Maybe it's possible to specify some custom dependencies or a docker container?

[flit]

pypa/cibuildwheel#459 might have some useful hints?

Doesn't look like you can specify a docker image for Windows builds with cibuildwheel.

Anyway, for now at least building at install time will work for mingw. 😄

[flit]

Just noticed: could you please add you copyright to the top of setup.py?

[mhkline]

Added my copyright notice. Honestly not sure how this is normally done, but hopefully this is ok.

pypa/cibuildwheel#459 might have some useful hints?

Good find. Maybe when I have a minute I can try to understand what's going on there.

[flit]

Your copyright looks perfect. Thanks for adding. 😄