[issue19569] Use __attribute__((deprecated)) to warn usage of deprecated functions and macros

[STINNER Victor]

STINNER Victor added the comment:

Ping myself!

I just cited this GCC attribute in a recent discussion on deprecating macros in the C API:
https://mail.python.org/pipermail/python-dev/2016-September/146537.html

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<http://bugs.python.org/issue19569>
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