[issue41617] __builtin_bswap16 is used without checking it is supported

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Thank you Joshua Root for your bug report! Your PR 21942 was good, but I chose to avoid __has_builtin() since it is not supported by all compilers and only available since GCC 10 for GCC.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41617>
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