From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 20233 invoked by alias); 18 Mar 2014 11:38:22 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 20175 invoked by uid 48); 18 Mar 2014 11:38:18 -0000 From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/55896] Annoying compiler warning Date: Tue, 18 Mar 2014 11:38:00 -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: 4.7.2 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-03/txt/msg01557.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55896 Jakub Jelinek changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek --- But there is && content_1[0] == '[' guard around it, but likely just no optimization figures out that the inlined w_strlen (why aren't you using strlen???) will always return at least 1 and thus the jump threaded variant with zero length is dead. I suppose instead of using w_strlen (contents_1) - 1 you could just use w_strlen (contents_1 + 1) and the warning could go away.