@node getopt
@section @code{getopt}
@findex getopt

POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/getopt.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
The default behavior of the glibc implementation of @code{getopt} allows
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.
@end itemize

Gnulib provides a module @code{getopt} that has support for ``long options''.
Compared to POSIX, it adds a header file @code{<getopt.h>} and functions
@code{getopt_long} and @code{getopt_long_only}.