[issue1640] Enhancements for mathmodule

[Guido van Rossum]

Guido van Rossum added the comment:

> Guido van Rossum wrote:
> > Good idea. Since you seem to like providing patches, can you create
> > one for math.copysign()?
>
> Don't forget it's copysign() on Unix but _copysign() on Windows.
>
> #if defined(MS_WINDOWS) || defined(HAVE_COPYSIGN)
> #ifdef MS_WINDOWS
> FUNC2(copysign, _copysign,
> #else
> FUNC2(copysign, copysign,
> #endif
>     "doc");
> #endif
>
> should work on all systems.

Well, the Python API in the math module should always be called copysign(). :-)

And what to do if neither is present? Are there any systems without it?

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<http://bugs.python.org/issue1640>
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