Re: CURRENT: CLANG 3.3 and -stad=c++11 and -stdlib=libc++: isnan()/isninf() oddity

From: Garrett Wollman <wollman_at_csail.mit.edu> Date: Wed, 10 Jul 2013 16:25:30 -0400 · This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:40:39 UTC

<<On Wed, 10 Jul 2013 22:12:59 +0200, Tijl Coosemans <tijl_at_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