support using clang

[seigeweapon]

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

Is there plan to add clang?

[jaraco]

No plans. I'm surprised there's not already support for clang somehow. Behavior is entangled with distutils in stdlib, so I don't know what it would take. Happy for someone to evaluate and develop a plan.

[wkschwartz]

Can you do the following?

$ CC="clang" python setup.py build

[zufuliu]

@isuruf has a PR for using clang-cl at python/cpython#18371, but since distutils in stdlib is going to be removed (see https://bugs.python.org/issue41282), don't known where is should go.

[pganssle]

It should go here.

[jaraco]

If the patch can be applied to distutils, please submit it against pypa/distutils, whereafter it will be incorporated here directly.

[isuruf]

It's not enough to have distutils support. CPython headers need a small change which is fixed in python/cpython#18371

[isuruf]

pypa/distutils#7