GNU bug report logs - #57604
[ef]grep usage -> POSIXLY_CORRECT?

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Message #23 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Simon Josefsson <simon <at> josefsson.org>
To: Paul Eggert via Bug reports for GNU grep <bug-grep <at> gnu.org>
Cc: 57604 <at> debbugs.gnu.org, Karl Berry <karl <at> freefriends.org>
Subject: Re: bug#57604: [ef]grep usage -> POSIXLY_CORRECT?
Date: Wed, 07 Sep 2022 10:02:04 +0200

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Paul Eggert via Bug reports for GNU grep <bug-grep <at> gnu.org> writes:

> $ grep '\Q' /dev/null
> grep: warning: stray \ before Q
> $ grep '[:alpha:]' /dev/null
> grep: character class syntax is [[:space:]], not [:space:]

Is the use of diagnostic warnings like this supported by POSIX?
Personally, I'd rather have tools exit with an error code on invalid
uses rather than issuing warning messages.

/Simon

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