[issue21668] The select and time modules uses libm functions without linking against it

[STINNER Victor]

STINNER Victor added the comment:

>  audioop_ctypes_test_link_with_libm.patch 

+                             libraries=['m'])

Why not using math_libs here? It would also be nice to add a comment explaining why libm is needed in each module.

Can someone please combine both patches?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21668>
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