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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/97321] add warning for pointer casts that may lead to aliasing violation when dereferenced
Date: Wed, 07 Oct 2020 14:35:12 +0000	[thread overview]
Message-ID: <bug-97321-4-tQ94vvARJp@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-97321-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97321

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
> gcc t5.c -O2 -Wstrict-aliasing=2
t5.c: In function 'g':
t5.c:5:32: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
    5 |     return f((unsigned char **)&p);
      |                                ^~

so it already works.

      reply	other threads:[~2020-10-07 14:35 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07 14:17 [Bug c/97321] New: " nsz at gcc dot gnu.org
2020-10-07 14:35 ` rguenth at gcc dot gnu.org [this message]

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