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12.17 getopt.h

Defines the type struct option and declares the variables optarg, optind, opterr, optopt and the functions getopt, getopt_long, getopt_long_only.

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Getopt.html,
• man getopt.

Gnulib module: getopt-gnu

Portability problems fixed by Gnulib:

• This header file is missing on some platforms: AIX 7.2, HP-UX 11, MSVC 14.
• The function getopt_long is missing on some platforms: IRIX 6.5, Solaris 9.
• The function getopt_long_only is missing on some platforms: FreeBSD 5.2.1, NetBSD 9.0, IRIX 6.5, Solaris 9, mingw.
• The method to reset options is incompatible on some platforms: FreeBSD 6.0, NetBSD 9.0(?), OpenBSD 6.7, Cygwin 1.5.x, mingw.
• The function getopt does not handle a leading ‘+’ character in the options string on some platforms: Solaris 11 2010-11.

Portability problems not fixed by Gnulib: