From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 11862 invoked by alias); 13 Nov 2004 20:18:19 -0000 Mailing-List: contact gdb-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sources.redhat.com Received: (qmail 11828 invoked from network); 13 Nov 2004 20:18:14 -0000 Received: from unknown (HELO nevyn.them.org) (66.93.172.17) by sourceware.org with SMTP; 13 Nov 2004 20:18:14 -0000 Received: from drow by nevyn.them.org with local (Exim 4.34 #1 (Debian)) id 1CT4LT-0006JR-Cu; Sat, 13 Nov 2004 15:18:03 -0500 Date: Sat, 13 Nov 2004 20:50:00 -0000 From: Daniel Jacobowitz To: Otto Wyss Cc: gdb@sources.redhat.com Subject: Re: GDB doesn't show the correct line Message-ID: <20041113201803.GA21320@nevyn.them.org> Mail-Followup-To: Otto Wyss , gdb@sources.redhat.com References: <40D5E480.4A68163@orpatec.ch> <20040620202929.GA17216@nevyn.them.org> <40D7212F.E68A9D61@orpatec.ch> <20040621175928.GA13407@nevyn.them.org> <40D725AF.FC2AAF3A@orpatec.ch> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <40D725AF.FC2AAF3A@orpatec.ch> User-Agent: Mutt/1.5.5.1+cvs20040105i X-SW-Source: 2004-11/txt/msg00127.txt.bz2 On Mon, Jun 21, 2004 at 08:15:10PM +0200, Otto Wyss wrote: > Daniel Jacobowitz wrote: > > > > > I can only speculate that it's because of one of the standard headers > > > which are unique to this program. But they are from an ordinary > > > Debian/sarge system. How can I detect further where the offset is introduced? > > > > The only things that I can recommend: > > - Look at the preprocessor output (gcc -E). See if there are missing > > #line directives (usually just "# " in preprocessor output). > > The syntax of these things is really hard to read. > > - Look at the debug info with readelf -wl and compare it to the > > object code. > > > Not a very nice prospect, I guess I won't be able to detect anything > useful within resonable time :-( > > > It sounds like it is more likely to be a problem with GCC's output than > > GDB's parsing. > > > I just inserted a syntax error in my source, at least GCC reports the > correct line number. > > Can't this line number problem somehow detected within GDB? Sorry if I > ask this as someone without knowing any internals but IMO this would be > the best solution. My app is now working so I'm not in a hurry but a > good debugger is _essential_ for any development. It's no one's fault, I think. I tracked down the problem. You have mixed newline conventions in the file: mostly "\n" as a line separator, but in some places just "\r". GCC treats this as a line break for legacy reasons (MacOS). 'less' doesn't, which really confused me while trying to debug the problem. GDB doesn't, either. Should GDB? I have no idea. But it's easiest to just fix the source file to be consistent. -- Daniel Jacobowitz