Remove check for stdarg.h (HAVE_STDARG_PROTOTYPES) in configure.ac

[kumaraditya303]

CPython checks for stdarg.h as HAVE_STDARG_PROTOTYPES ¹ at some places ² but not at other places ³. Either this check should be repeated at every call site or should be removed all together, most compilers supports this nowadays (should be verified with buildbots).

cc @vstinner @tiran @erlend-aasland

Footnotes

1. https://github.com/python/cpython/blob/16a7e4a0b75080275bf12cfb71d54b01d85099b2/configure.ac#L5026 ↩

2. https://github.com/python/cpython/blob/16a7e4a0b75080275bf12cfb71d54b01d85099b2/Modules/_asynciomodule.c#L2646 ↩

3. https://github.com/python/cpython/blob/16a7e4a0b75080275bf12cfb71d54b01d85099b2/Objects/call.c#L557 ↩

[vstinner]

Do you want to propose a PR for that?

[kumaraditya303]

Created PR #93215

[erlend-aasland]

[...] most compilers supports this nowadays

As pointed out in cython/cython#4820, this may change in the future:

https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2975.pdf

[h-vetinari]

As pointed out in cython/cython#4820, this may change in the future:

https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2975.pdf

Bit late, but JFYI, this paper got accepted into C23.

Edit: sorry for the double-post; GH bugging with server errors here...