From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id EF6BE3858C2D; Wed, 15 Mar 2023 08:16:22 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org EF6BE3858C2D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1678868182; bh=0FpfqsMJa+CMI3AVXOpidvFtpzuDXIywX4nEoHvM7d0=; h=From:To:Subject:Date:In-Reply-To:References:From; b=LxRZxmPWnBMLCeJOT7sa/x1RZ43KhUw1QRsh1gz0i8U70E5ShaQA3g/vlxsmtfMVO miH4PE1DdMTjoTd+3rlNpDaWUF724LyWGEuJBGkVW3fUFVpXQmlPFwIbOFQlrMxKBA UG/YC+Lj5agGBUsC0paB2Zh0wAEe/x+zrKDTDmes= From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/109123] Bogus warning: pointer used after 'realloc' -Wuse-after-free with -O2 Date: Wed, 15 Mar 2023 08:16:22 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 12.2.1 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: NEW 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: attachments.created 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109123 --- Comment #9 from Richard Biener --- Created attachment 54668 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54668&action=3Dedit patch The diagnostic pass (pass_warn_access) is already split into two modes, unfortunately the -Wuse-after-free part only runs on the late optimized IL (for whatever reasons ...). Enabling it only for the early passes regresses a few cases but also resolv= es some XFAILs (and your testcase), so it might be the best thing to do. I'm testing the attached.=