From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 6E62E385609B; Sat, 4 Jun 2022 08:24:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6E62E385609B From: "goswin-v-b at web dot de" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/105844] std::lcm(50000, 49999) is UB but accepted in a constexpr due to cast to unsigned Date: Sat, 04 Jun 2022 08:24:31 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Version: 12.1.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: goswin-v-b at web dot de 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: 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 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: Sat, 04 Jun 2022 08:24:31 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105844 --- Comment #3 from Goswin von Brederlow --- Created attachment 53082 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53082&action=3Dedit Working patch for detecting UB This will abort if the arguments are too large instead of static_assert, be= st I could figure out that would work.=