https://www.ibm.com/docs/en/SSGH3R_16.1.0/pdf/getstart.pdf
As far as reading page 3, xlclang fully supports C89/C99/C11. xlc fully supports C89/C99, and partially supports C11. On Tue, Feb 8, 2022 at 8:57 AM Brett Cannon <br...@python.org> wrote: > > > > On Mon, Feb 7, 2022 at 9:12 AM Victor Stinner <vstin...@python.org> wrote: >> >> Hi, >> >> I made a change to require C99 <math.h> "NAN" constant and I'm was >> asked to update the PEP 7 to clarify the C subset is needed to build >> Python 3.11. >> >> Python 3.6 requires a subset of the C99 standard to build defined by the PEP >> 7: >> https://www.python.org/dev/peps/pep-0007/ >> >> I modified Python 3.11 to require more C99 features of the <math.h> header: >> >> * bpo-45440: copysign(), hypot(), isfinite(), isinf(), isnan(), round() >> * bpo-46640: NAN >> >> After my NAN change (bpo-46640), Petr Viktorin asked me to update the >> PEP 7. I proposed a change to simply say that "Python 3.11 and newer >> versions use C99": >> https://github.com/python/peps/pull/2309 >> >> I would prefer to not have to give an exhaustive list of C99 features >> used by CPython, since it's unclear to me what belongs to C99 or to >> ISO C89. As I wrote before, Python already uses C99 features since >> Python 3.6. >> >> On my PEP PR, Guido van Rossum asked me to escalate the discussion to >> python-dev, so here I am :-) >> >> In "C99", the number "99" refers to the year 1999, the standard is now >> 23 years old: >> https://en.wikipedia.org/wiki/C99 >> >> In 2022, C99 is now well supported by C compilers supported by Python: >> GCC, clang, MSVC. > > > I think if those compilers fully C99 at this point we should consider just > moving completely over to C99. > > -Brett > >> >> >> I don't know if AIX XLC supports C99. AIX provides a "c99" compiler >> compatible with C99. It also seems like GCC is usable on AIX. >> >> I don't know if ICC supports C99. Python doesn't officially the ICC >> compiler, the ICC buildbots are gone a few years ago. But sometimes I >> make some changes to enhance the ICC support, when the change is small >> enough. >> >> Note: Python also uses C11 <stdatomic.h>, but it's not required: there >> are fallbacks for compilers which don't support it. >> >> Victor >> -- >> Night gathers, and now my watch begins. It shall not end until my death. >> _______________________________________________ >> Python-Dev mailing list -- python-dev@python.org >> To unsubscribe send an email to python-dev-le...@python.org >> https://mail.python.org/mailman3/lists/python-dev.python.org/ >> Message archived at >> https://mail.python.org/archives/list/python-dev@python.org/message/J5FSP6J4EITPY5C2UJI7HSL2GQCTCUWN/ >> Code of Conduct: http://python.org/psf/codeofconduct/ > > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/ZLDOBJUVMTIRETVRNHPWWO5MBHTXYEW3/ > Code of Conduct: http://python.org/psf/codeofconduct/ -- Inada Naoki <songofaca...@gmail.com> _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/XIMQWFVP7RJW7CTV74YPWI74L7ZUU2PX/ Code of Conduct: http://python.org/psf/codeofconduct/
