log
===

POSIX specification:
 https://pubs.opengroup.org/onlinepubs/9699919799/functions/log.html

Gnulib module: log or log-ieee

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

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 11.4.

Portability problems not fixed by Gnulib: