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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug preprocessor/104030] [12 Regression] -Wbidi-chars should not
 warn about UCNs
Date: Fri, 14 Jan 2022 14:59:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104030

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Either we drop the UCN support altogether, or make -Wbidi-chars a 2 level
warning, -Wbidi-chars mapping to -Wbidi-chars=3D1 which doesn't warn about =
UCNs
and
-Wbidi-chars=3D2 that does.
UCNs indeed don't have the problem that a user in an editor sees something
different than what it actually is (unless some editor interprets UCNs and
shows them as unicode chars), but one reason to warn about UCNs was to make
sure that even what the program prints doesn't suffer from such problems.  =
Of
course, if something like libreoffice (I bet) carefully ensures it is paire=
d,
but constructs it from smaller separate literals, then it is fine.=