HP-UX 11.00, IRIX 6.5, Solaris 2.6, mingw, Interix 3.5.
@item
This function returns 0 when the first argument is NULL in some locales on some platforms:
-AIX 4.3, OSF/1 5.1, Solaris 10.
+AIX 4.3, OSF/1 5.1, Solaris 11 2010-11.
@end itemize
Portability problems not fixed by Gnulib: