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13.22.1 getopt_long

LSB specification:
https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-getopt-long-3.html

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Getopt-Long-Options.html,
• man getopt_long.

Gnulib module: getopt-gnu

Portability problems fixed by Gnulib:

• This function is missing on some platforms: AIX 5.1, HP-UX 11, MSVC 14.
• The function getopt_long does not obey the combination of ‘+’ and ‘:’ flags in the options string on some platforms: glibc 2.11.
• The use of ‘W;’ in the optstring argument to does not always allow -W foo to behave synonymously with --foo: glibc 2.11.
• The function getopt_long does not support the ‘+’ flag in the options string on some platforms: macOS 14, AIX 5.2, Solaris 10.
• The value of optind after a missing required argument is wrong on some platforms: macOS 14.
• The function getopt_long does not obey the ‘-’ flag in the options string when POSIXLY_CORRECT is set on some platforms: Cygwin 1.7.0.
• Some implementations fail to reset state, including re-checking POSIXLY_CORRECT, when optind is set to ‘0’: NetBSD, Cygwin 1.7.0.
• The function getopt_long does not support options with optional arguments on some platforms: macOS 14, OpenBSD 4.0, AIX 5.2, Solaris 11 2010-11, Cygwin 1.5.x.
• This function crashes if the option string includes W; but there are no long options, on some platforms: glibc 2.14.

Portability problems not fixed by Gnulib: