From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28251 invoked by alias); 1 May 2011 10:27:41 -0000 Received: (qmail 28242 invoked by uid 22791); 1 May 2011 10:27:40 -0000 X-SWARE-Spam-Status: No, hits=-2.7 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 01 May 2011 10:27:27 +0000 From: "niko.lecam at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/48795] -Warray-bounds false positive X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: niko.lecam at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Sun, 01 May 2011 10:27:00 -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 X-SW-Source: 2011-05/txt/msg00011.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48795 --- Comment #3 from Nicolas Le Cam 2011-05-01 10:11:47 UTC --- (In reply to comment #2) > "r1->data[1] = prm2" goes above "char data[1]" bounds. How it's a false > positive? Because the structure is a kind of flexible array (code has to follow C89/C90 standard) and is big enough to handle a second member. (Or the warning has to be emitted even if you remove the call to p, which is not the case actually) This example is a deliberate use of overflow to circumvent the absence of flexible arrays in C89/C90, disabling Warray-bounds to avoid the flood it generates isn't the right solution IMHO.