From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 0DBE33858010; Wed, 15 Jun 2022 15:57:11 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 0DBE33858010 From: "joseph at codesourcery dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/105969] [12 Regression] ICE in Floating point exception Date: Wed, 15 Jun 2022 15:57:11 +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: 13.0 X-Bugzilla-Keywords: accepts-invalid, ice-on-valid-code, needs-bisection X-Bugzilla-Severity: normal X-Bugzilla-Who: joseph at codesourcery dot com X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.2 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, 15 Jun 2022 15:57:12 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105969 --- Comment #3 from joseph at codesourcery dot com --- Overlapping elements is simply a consequence of the zero-sized-objects=20 extension, I don't see anything invalid here to reject (though there might= =20 be undefined behavior at runtime when sprintf accesses bytes beyond the=20 zero-sized object; even if char a[0][0][0] is treated like a flexible=20 array member, it's not clear a flexible array member whose elements=20 themselves have zero size can be validly used to access any bytes).=