Matthieu S added the comment:

Sorry for the very late reply...

Using _LINUX_SOURCE_COMPAT is sometimes preferable, as it greatly improves 
compatibility with code intended for Linux and improves XPG specs compliance.

But I am not sure it should always be enabled.

In our case, we use it as there where issues with AIX malloc and hotshot when 
building without it, but Python seems to globally work fine without, and we did 
not compare performances.

Like you, I don't know why this was overridden, so it might be safer to keep 
the override and just add the #ifdef _LINUX_SOURCE_COMPAT.

This also applies to Python 2.7.

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