[Bug libc/22099] getconf help info

["eblake at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22099

--- Comment #7 from Eric Blake <eblake at redhat dot com> ---
The POSIX wording is not set in stone; if we have a better proposal (possibly
under the guise of a different option) than the current difference in output
between BSD getopt and glibc getopt, right now is our chance to propose that to
the Austin Group.

BSD does have 'getopt -l' which lists the known names (but not values) that can
be queried; the Austin Group did discuss that as being one possibility, but at
the time said that it has fewer implementations than 'getopt -a'.  But if we
can argue back to the Austin Group that 'getopt -l' is the better interface
from the get-go, and implement it such that the output is equivalent to BSD's
output, then it stands a better chance of the Austin Group standardizing
'getopt -l' and leaving 'getopt -a' as an unspecified extension option.

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