The @code{getopt} function keeps some internal state that cannot be explicitly
reset on some platforms:
mingw.
+@item
+The value of @code{optind} after a missing required argument is wrong
+on some platforms:
+MacOS 10.5.
@end itemize
Portability problems fixed by Gnulib module @code{getopt-gnu}:
string on some platforms:
MacOS X 10.5, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10.
@item
+The function @code{getopt} does not obey the combination of @samp{+}
+and @samp{:} flags in the options string on some platforms:
+glibc 2.11.
+@item
+The function @code{getopt} does not obey the @samp{-} flag in the options
+string when @env{POSIXLY_CORRECT} is set on some platforms:
+Cygwin 1.7.0.
+@item
The function @code{getopt} does not support options with optional arguments
on some platforms:
-MacOS X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin.
+MacOS X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1,
+Solaris 10, Cygwin 1.5.x.
@item
The function @code{getopt_long} is missing on some platforms:
AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 9, Interix 3.5.
+@item
+The function @code{getopt_long_only} is missing on some platforms:
+MacOS X 10.3, FreeBSD 5.2.1, NetBSD 3.0, AIX 5.1, HP-UX 11, IRIX 6.5,
+OSF/1 5.1, Solaris 9, mingw, Interix 3.5.
@end itemize
Portability problems not fixed by Gnulib:
mixing option and non-option arguments on the command line in any order.
Other implementations, such as the one in Cygwin, enforce strict POSIX
compliance: they require that the option arguments precede the non-option
-arguments. This is something to watch out in your program's testsuite.
+arguments. This is something to watch out in your program's
+testsuite.
@item
-The function @code{getopt_long_only} is missing on some platforms:
-MacOS X 10.3, FreeBSD 5.2.1, NetBSD 3.0, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw, Interix 3.5.
+The glibc implementation allows a complete reset of the environment,
+including re-checking for @env{POSIXLY_CORRECT}, by setting
+@code{optind} to 0. Several BSD implementations provide @code{optreset},
+causing a reset by setting it non-zero, although it does not
+necessarily re-read @env{POSIXLY_CORRECT}. Solaris @code{getopt} does
+not support either reset method, but does not maintain state that
+needs the extra level of reset.
@end itemize