FreeBSD 5.2.1, OpenBSD 3.8, AIX 5.1, IRIX 6.5, OSF/1 4.0, Solaris 9, Interix 3.5.
@item
This functions returns a wrong result for x = 1/2 - 2^-54 on some platforms:
-NetBSD 3.0.
+NetBSD 3.0, AIX 7.1.
@end itemize
Portability problems not fixed by Gnulib: