package python (for cygwin c lib) compatibility issue with UCR64

[FirePowi]

Description / Steps to reproduce the issue

Issue:

pyconfig.h has been set up for msys (cygwin c library) and isn’t compatible with UCRT64 (and I’d guess other libraries?)

While trying to build some pip packages, gcc has fatal error sys/select.h: No such file or directory.

Related Issue: #3307

Reproduce:

Inside MSYS2 UCRT64

1. Install default python with pip.
2. pip install ujson or pip install brotli (Or any time gcc includes python.h) (Remove if already installed)

Temporary fix:

Install pip packages from MSYS2 MSYS, it works but is bit hacky and pretty annoying but does the job for the time being.

OR

[Dirty, please don’t do that if you’re unsure] Comment all the HAVE_SYS_XYZ you don’t have, directly in /usr/include/python3.11/pyconfig.h You can see which ones you have at /ucrt64/include/sys

Expected behavior

Being able to use pip no matter the environment.

Actual behavior

Some pip packages can only be installed using MSYS environment.

Verification

• [X] I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

Windows Version

MINGW64_NT-10.0-22621

Are you willing to submit a PR?

Maybe in the future

[lazka]

I'd guess this is a case of mixing msys/cygwin and native gcc.

You need to install the native Python and toolchain for UCRT64:

pacman -S mingw-w64-ucrt-x86_64-python mingw-w64-ucrt-x86_64-python-pip mingw-w64-ucrt-x86_64-gcc