[issue9920] test_cmath on atan fails on AIX

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

P.S.  Was the test with a debug build of Python?  If not, could you see if the test failure still occurs with a debug build (i.e., when --with-pydebug is passed as a configure argument)?  That would help eliminate compiler optimization bugs as a possible cause.

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