[issue7518] Some functions in pymath.c should be moved elsewhere.

[Mark Dickinson]

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

For the recently added expm1 function (see issue #3366), I've put the 
substitute code in a new file Modules/_math.c, that's linked into math.so.  
I plan to move the other substitute libm functions from pymath.c into this 
file, and to link _math.c into the cmath module as well as the math 
module.

Roumen, I'm not sure I understand your comments about atan2.  Is there 
some link between atan2 and tanh that I'm not aware of?  Which platforms 
have unexpected behaviour for atan2?

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<http://bugs.python.org/issue7518>
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