Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com Date: Tue, 27 Mar 2001 17:35:31 -0500 From: Christopher Faylor To: Cygwin Cc: matts@bluesguitar.org Subject: Re: Debugging setup.exe Message-ID: <20010327173531.A11821@redhat.com> Reply-To: cygwin@cygwin.com Mail-Followup-To: Cygwin , matts@bluesguitar.org References: <02b701c0b707$7c30a230$3c5350d8@bluesguitar.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.11i In-Reply-To: <02b701c0b707$7c30a230$3c5350d8@bluesguitar.org>; from matts@bluesguitar.org on Tue, Mar 27, 2001 at 03:47:14PM -0600 On Tue, Mar 27, 2001 at 03:47:14PM -0600, Matthew Smith wrote: >Changing 'int r' to 'volatile int r' seemed like a good idea, so I tried >that, and it works well. Now however, I've run into some stranger behavior >still. Take a look at this code snippet: > > r = (y + ROW_MARGIN/2) / row_height; > > if (r < 0 || r >= npackages) > return 0; > > int p = package_indexes[r]; > > if (x >= headers[NEW_COL].x - HMARGIN/2 && x <= headers[NEW_COL+1].x - >HMARGIN/2) > { > ... > > >Ok, I step through and 'r' is set to a reasonable number. 'p' is then set >to 0, which seems reasonable enough as well. We hit the 'if' conditional, >and get this....execution then goes BACKWARDS and executes the 'int p = >package_indexes[r];' line again! At that point, p is set to some gigantic >negative number, so when we use it as an array index a short time later, >everything blows up. Is this related to the optimizer too? Seems odd. DJ has already indicated that what you are seeing is an artifact of optimization. Build setup.exe without the -O2 if you are having problems. cgf -- Want to unsubscribe from this list? Check out: http://cygwin.com/ml/#unsubscribe-simple