<<On Wed, 10 Jul 2013 22:12:59 +0200, Tijl Coosemans <t...@freebsd.org> said:
> I think isnan(double) and isinf(double) in math.h should only be
> visible if (_BSD_VISIBLE || _XSI_VISIBLE) && __ISO_C_VISIBLE < 1999.
> For C99 and higher there should only be the isnan/isinf macros.
I believe you are correct. POSIX.1-2008 (which is aligned with C99)
consistently calls isnan() a "macro", and gives a pseudo-prototype of
int isnan(real-floating x);
-GAWollman
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