From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 756A13858421; Wed, 19 Jan 2022 20:54:01 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 756A13858421 From: "msebor at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/104069] -Werror=use-after-free false positive on elfutils-0.186 Date: Wed, 19 Jan 2022 20:54:01 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: msebor at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: msebor at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jan 2022 20:54:01 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104069 --- Comment #20 from Martin Sebor --- This warning, like all others, is meant to help find common bugs in ordinary code. It shouldn't be expected to reflect implementation-defined behavior = or to be free of false positives. Tricky code that tries to work around implementation specifics or divergences might be better off suppressing it using a #pragma. Now that pragma suppression works reliably with inlining = it should be straightforward to do. Since -Wuse-after-free is a multi-level warning and this instance triggers only at level 2 ("may be used"), for code that can't be changed I suggest reducing the level to 1 on the command line= .=