On 2018-Jul-10, Emre Hasegeli wrote:
> isnan() function is evidently not present on <math.h> on Windows
> before Visual Studio 2013. We define it on win32_port.h using
> _isnan(). However _isnan() is also not present. It is on <float.h>.
> The patch is attached to include this from win32_port.h.
>
> Thanks to Thomas Munro for point this out to me [1]. It is hard to
> notice this issue without testing the changes on Windows.
Oh, it looks like commits 33a7101281c6, 8e211f539146, 86dbbf20d849
(probably others) papered over this by the expedient of adding #include
<float.h> to random .c files rather than your patch, which seems the
proper fix.
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