From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29716 invoked by alias); 3 Mar 2010 15:41:07 -0000 Received: (qmail 29685 invoked by uid 22791); 3 Mar 2010 15:41:05 -0000 X-SWARE-Spam-Status: No, hits=-2.5 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS X-Spam-Check-By: sourceware.org Received: from smtp-out.google.com (HELO smtp-out.google.com) (216.239.44.51) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 03 Mar 2010 15:41:01 +0000 Received: from spaceape14.eur.corp.google.com (spaceape14.eur.corp.google.com [172.28.16.148]) by smtp-out.google.com with ESMTP id o23FevJd025024 for ; Wed, 3 Mar 2010 07:40:58 -0800 Received: from fxm4 (fxm4.prod.google.com [10.184.13.4]) by spaceape14.eur.corp.google.com with ESMTP id o23Feden015189 for ; Wed, 3 Mar 2010 07:40:56 -0800 Received: by fxm4 with SMTP id 4so1645357fxm.20 for ; Wed, 03 Mar 2010 07:40:56 -0800 (PST) Received: by 10.223.4.217 with SMTP id 25mr8502050fas.82.1267630855990; Wed, 03 Mar 2010 07:40:55 -0800 (PST) Received: from coign.google.com ([67.218.106.224]) by mx.google.com with ESMTPS id g28sm9425471fkg.58.2010.03.03.07.40.53 (version=TLSv1/SSLv3 cipher=RC4-MD5); Wed, 03 Mar 2010 07:40:55 -0800 (PST) To: Steve Teale Cc: gcc-help@gcc.gnu.org Subject: Re: Strange debug behavior with 4.4.3 References: <1267613238.12719.16.camel@Ubuntu> From: Ian Lance Taylor Date: Wed, 03 Mar 2010 15:41:00 -0000 In-Reply-To: <1267613238.12719.16.camel@Ubuntu> (Steve Teale's message of "Wed\, 03 Mar 2010 13\:47\:18 +0300") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-System-Of-Record: true X-IsSubscribed: yes Mailing-List: contact gcc-help-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-help-owner@gcc.gnu.org X-SW-Source: 2010-03/txt/msg00041.txt.bz2 Steve Teale writes: > (gdb) n > 6313 input_location = EXPR_LOCATION (*expr_p); > (gdb) n > 6729 post_p == &internal_post ? NULL : post_p, > > Things go pear shaped after line 6312 - after that, next seems to get > you somewhere rather arbitrary. You are debugging optimized code. Random jumps do happen. You need to go further to see if there is a real problem here. Ian