8.435 isinf

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/isinf.html

Gnulib module: isinf

Portability problems fixed by Gnulib:

• This macro is missing on some platforms: AIX 5.1, IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11.
• This macro incorrectly yields true for some ‘long double’ arguments, on some platforms: OpenBSD 4.9/x86 (pseudo-Infinity).

Portability problems not fixed by Gnulib: