From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id CD2FB3860C08; Wed, 25 May 2022 15:06:52 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CD2FB3860C08 From: "foom at fuhm dot net" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/36685] clarify/diagnose use of weak constant Date: Wed, 25 May 2022 15:06:52 +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: 4.2.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: foom at fuhm dot net 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: cc 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, 25 May 2022 15:06:52 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D36685 James Y Knight changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |foom at fuhm dot net --- Comment #4 from James Y Knight --- The interaction of __attribute__((weak)) and const int was recently explore= d in Clang in this thread: https://discourse.llvm.org/t/weak-attribute-semantics-on-const-variables/62= 311 Strangely, it appears that Clang and GCC have opposite odd behavior current= ly: GCC appears to evaluate weak constants _only_ in constant evaluation (so lo= ng as=