9.530 logf

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

Gnulib module: logf or logf-ieee

Portability problems fixed by either Gnulib module logf or logf-ieee:

• This function is missing on some platforms: Minix 3.1.8, AIX 5.1, Solaris 9.
• This function is only defined as a macro with arguments on some platforms: MSVC 9.
• This function returns a wrong value for a minus zero argument on some platforms: OSF/1 5.1.

Portability problems fixed by Gnulib module logf-ieee:

• This function returns a wrong value for a negative argument on some platforms: NetBSD 5.1.

Portability problems not fixed by Gnulib: