This function does not always return an absolute path on some
platforms:
Solaris.
+@item
+This function fails to detect trailing slashes on non-directories on
+some platforms:
+glibc 2.3.5.
+@item
+This function fails to recognize non-directories followed @samp{..} on
+some platforms:
+cygwin.
@end itemize
Portability problems not fixed by Gnulib: