STINNER Victor <vstin...@python.org> added the comment:

Checking how Python is linked or checking the libm version sounds overkill to 
me. "if (x == y)" test is really cheap: I don't expect nextafter() to be used 
in performance critical code path anyway. That's why I even consider to add 
this code path on all platforms, not only AIX.

Mark: what's your call on that one? Make the code conditional on AIX? In 
practice, it seems like only (old libm) AIX nextafter() requires to be 
"patched".

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39396>
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