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getopt error message wording

From: Eric Blake
Subject: getopt error message wording
Date: Sun, 24 Sep 2006 20:09:28 +0000

Currently, getopt bases its decision of whether to print "illegal option"
or "invalid option" solely on the presence of POSIXLY_CORRECT, but
POSIX 2001 relaxed the requirements so that the error message no
longer need use the term "illegal".  Is it worth updating the getopt
module to depend on posixver and avoid this term except when
_POSIX2_VERSION is set to the older version of POSIX?

Eric Blake

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