gh-123681: Check NORMALIZE_CENTURY behavior at runtime; require C99 #136022
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…at the compile time It is needed to support cross-compiling. Remove macros Py_NORMALIZE_CENTURY and Py_STRFTIME_C99_SUPPORT.
encukou
requested review from
pganssle,
abalkin,
ericsnowcurrently,
erlend-aasland and
corona10
as code owners
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If remove the C99 check in the C code, we should also remove _can_support_c99() in Lib/_pydatetime.py.
Look in #122272 for reasons for adding this check at first place.
| self.check_strftime_y2k('Y') | ||
| self.check_strftime_y2k('G') | ||
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| def test_strftime_y2k_c99(self): |
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Should not it be decorated with cpython_only?
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Good point! The meaning of cpython_only is not very clear.
This test might be usable for other implementations as well, so I think it's best for other implementations to skip the test if it doesn't work for them. IMO, cpython_only is best for things like bytecode details or sys.getsizeof.
But, that's just my opinion of course.
Lii43
approved these changes
Jun 30, 2025
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This is a continuation of #128444.
CPython requires C11, so all C99 features should work.
We might need workaround if a supported platform misbehaves (hence this PR -- I want to feed the buildbots). But, IMO, any workarounds for unsupported platforms best left to the respective forks.
Serhiy's runtime check for
normalize_centuryis left in; I don't know about the details there.test_strftime_y2kfails on embedded Linux #123681