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/ >
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