Clang is not in the list of allowed compilers when executed:
python setup.py build --help-compiler

  --compiler=bcpp     Borland C++ Compiler
  --compiler=cygwin   Cygwin port of GNU C Compiler for Win32
  --compiler=mingw32  Mingw32 port of GNU C Compiler for Win32
  --compiler=msvc     Microsoft Visual C++
  --compiler=unix     standard UNIX-style compiler

I've tried to use the value unix in windows, to see if it will search for environment variables CC and CXX, but without success.

I confirm the issue, the main issue we have to support the CLang compiler into distutils.

@matrixise

Hi, Stéphane

Can I take a look at this issue if no one works on it?

I have contributed to CPython, but it seems to be a good opportunity to contribute to a larger module.

One more thing,
It would be a good guide if you let me know what
I should pay attention to when solving this issue.

Thanks

Of course you can, good luck, if you need help ping us.

You might consider adding this support to setuptools rather than CPython. The distutils module is basically closed to non-essential enhancements like this, and will eventually be deprecated for public use (which means totally unused on Windows and only used to build CPython itself on other platforms).

Setuptools will merge in what it needs to cover existing scenarios and will become a required dependency for distutils-like builds. So eventually it will end up only in there anyway, and people will get to use it sooner if you start by putting it in setuptools.

Distutils is now deprecated (see PEP 632) and all tagged issues are being closed. From now until removal, only release blocking issues will be considered for distutils.

If this issue does not relate to distutils, please remove the component and reopen it. If you believe it still requires a fix, most likely the issue should be re-reported at https://github.com/pypa/setuptools