From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 7CC723850408; Mon, 19 Oct 2020 22:33:13 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7CC723850408 From: "msebor at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/94169] warn for modifying getenv() result Date: Mon, 19 Oct 2020 22:33:13 +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: 10.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: enhancement X-Bugzilla-Who: msebor 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: Mon, 19 Oct 2020 22:33:13 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94169 --- Comment #4 from Martin Sebor --- Yes. The recent proposal to change their signature to return const char* w= as=20 rejected in WG14 thanks to source compatibility concerns: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2526.htm http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2565.pdf I'm thinking of extending attribute access to annotate function return types similarly to function arguments. Another useful attribute is one that says: the function returns a pointer passed to it by argument N, plus some offset (with the offset being optional, and also specified by an argument).=