[3.9] bpo-41617: Add _Py__has_builtin() macro (GH-23260)#23262
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Fix building pycore_bitutils.h internal header on old clang version without __builtin_bswap16() (ex: Xcode 4.6.3 on Mac OS X 10.7). Add a new private _Py__has_builtin() macro to check for availability of a preprocessor builtin function. Co-Authored-By: Joshua Root <jmr@macports.org> Co-authored-by: Joshua Root <jmr@macports.org> (cherry picked from commit b3b9808)
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Fix building pycore_bitutils.h internal header on old clang version
without __builtin_bswap16() (ex: Xcode 4.6.3 on Mac OS X 10.7).
Add a new private _Py__has_builtin() macro to check for availability
of a preprocessor builtin function.
Co-Authored-By: Joshua Root jmr@macports.org
Co-authored-by: Joshua Root jmr@macports.org
(cherry picked from commit b3b9808)
https://bugs.python.org/issue41617