gh-123681: Check NORMALIZE_CENTURY behavior at runtime; require 8000 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.
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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.
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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