Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751321AbZGRMDG (ORCPT ); Sat, 18 Jul 2009 08:03:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751151AbZGRMDF (ORCPT ); Sat, 18 Jul 2009 08:03:05 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:59415 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751022AbZGRMDD (ORCPT ); Sat, 18 Jul 2009 08:03:03 -0400 Date: Sat, 18 Jul 2009 14:01:45 +0200 From: Ingo Molnar To: Anton Vorontsov , Sam Ravnborg Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, Steven Rostedt , Sam Ravnborg Subject: Re: [PATCH RFC 1/2] Makefile: Never use -fno-omit-frame-pointer Message-ID: <20090718120145.GB31007@elte.hu> References: <20090616201630.GA4971@oksana.dev.rtsoft.ru> <20090714133716.GC28970@oksana.dev.rtsoft.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090714133716.GC28970@oksana.dev.rtsoft.ru> User-Agent: Mutt/1.5.19 (2009-01-05) X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1438 Lines: 39 * Anton Vorontsov wrote: > On Wed, Jun 17, 2009 at 12:16:30AM +0400, Anton Vorontsov wrote: > > According to Segher Boessenkool and GCC manual, -fomit-frame-pointer > > is only the default when optimising on archs/ABIs where it doesn't > > hinder debugging and -pg. So, we do not get it by default on x86, > > not at any optimisation level. > > > > On the other hand, *using* -fno-omit-frame-pointer causes gcc to > > produce buggy code on PowerPC targets. > > > > If Segher and GCC manual are right, this patch should be a no-op > > for all arches except PowerPC, where the patch fixes gcc issues. > > > > Signed-off-by: Anton Vorontsov > > --- > > > > See this thread for more discussion: > > http://osdir.com/ml/linux-kernel/2009-05/msg01754.html > > > > p.s. > > Obviously, I didn't test this patch on anything else but PPC32. ;-) > > > > Segher, do you know if all GCC versions that we support for > > building Linux are behaving the way that GCC manual describe? > > No news is good news... Ingo, can we merge this into -tip for > testing? Changes to the top level Makefile should really go via Sam's kbuild tree. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/