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manual: Clarify that abbreviations of long options are allowed

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The man page and code comments clearly state that abbreviations of long
option names are recognized correctly as long as they are unique.
Document this fact in the glibc manual as well.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Reviewed-by: Andreas Schwab <schwab@linux-m68k.org>
(cherry picked from commit db1efe02c9)
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Siddhesh Poyarekar 2022-05-04 15:56:47 +05:30
parent 0bcba53020
commit ec5b79aac7
1 changed files with 2 additions and 1 deletions
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manual/getopt.texi
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@ -250,7 +250,8 @@ option, and stores the option's argument (if it has one) in @code{optarg}.
When @code{getopt_long} encounters a long option, it takes actions based
on the @code{flag} and @code{val} fields of the definition of that
option.
option. The option name may be abbreviated as long as the abbreviation is
unique.
If @code{flag} is a null pointer, then @code{getopt_long} returns the
contents of @code{val} to indicate which option it found. You should