From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 22FE33858C83; Tue, 15 Feb 2022 15:50:51 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 22FE33858C83 From: "qinzhao at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/104550] bogus warning from -Wuninitialized + -ftrivial-auto-var-init=pattern Date: Tue, 15 Feb 2022 15:50:51 +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: X-Bugzilla-Severity: normal X-Bugzilla-Who: qinzhao at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned 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: Tue, 15 Feb 2022 15:50:51 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104550 --- Comment #1 from qinzhao at gcc dot gnu.org --- Kees reported the following issue with -ftrivial-auto-var-init=3Dpattern. t= he testing case was reduced from Kernel building.=20 $ cat warns.i struct vx_audio_level { int has_monitor_level : 1; }; void vx_set_monitor_level() { struct vx_audio_level info; } $ gcc -Wall -Wno-unused-variable -ftrivial-auto-var-init=3Dzero -c -o /dev/= null warns.i $ gcc -Wall -Wno-unused-variable -ftrivial-auto-var-init=3Dpattern -c -o /dev/null warns.i warns.i: In function 'vx_set_monitor_level': warns.i:6:25: warning: 'info' is used uninitialized [-Wuninitialized] 6 | struct vx_audio_level info; | ^~~~ warns.i:6:25: note: 'info' declared here 6 | struct vx_audio_level info; | ^~~~=