log
===

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

Gnulib module: log or log-ieee

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

  * This function returns a wrong value for a minus zero argument on some platforms: OSF/1 5.1.

Portability problems fixed by Gnulib module log-ieee:

  * This function returns a wrong value for a negative argument on some platforms: NetBSD 5.1, Solaris 11 2011-11.

Portability problems not fixed by Gnulib: