msvcrt: Fix bugs in math.c

[Zheng Chen]

2015-03-23 1:06 GMT+08:00 Piotr Caban <piotr.caban at gmail.com>:

> On 03/22/15 17:54, Zheng Chen wrote:
>
>> Just came to me that maybe we should include isnan() in signbit()
>> instead of using isnan() in _copysign(), seems like that's how Windows
>> does it.
>>
> As far as I can see on MSDN signbit is only available in VS2012 and
> VS2013, I don't see any exports related to it in msvcr*/msvcp* dlls, so I
> guess it's inlined.
>
> We use host system implementation of the function to implement some other
> functions in wine. That's why you can't change signbit implementation.
>

Got it~ Thanks very much :)

Regards,
Zheng
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