From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753449Ab0ETAkV (ORCPT ); Wed, 19 May 2010 20:40:21 -0400 Received: from terminus.zytor.com ([198.137.202.10]:40634 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753150Ab0ETAkU (ORCPT ); Wed, 19 May 2010 20:40:20 -0400 Message-ID: <4BF484D8.7090803@zytor.com> Date: Wed, 19 May 2010 17:39:52 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4 MIME-Version: 1.0 To: Mauro Carvalho Chehab CC: Eric Dumazet , mingo@redhat.com, linux-kernel@vger.kernel.org, suresh.b.siddha@intel.com, tglx@linutronix.de, avi@redhat.com, linux-tip-commits@vger.kernel.org Subject: Re: Does anyone care about gcc 3.x support for x86 anymore? References: <1273135546-29690-2-git-send-email-avi@redhat.com> <1274213443.2485.3.camel@edumazet-laptop> <4BF2FF26.9050701@zytor.com> <1274217067.2485.9.camel@edumazet-laptop> <4BF308E9.4040809@zytor.com> <4BF46FFE.1080903@redhat.com> In-Reply-To: <4BF46FFE.1080903@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/19/2010 04:10 PM, Mauro Carvalho Chehab wrote: > H. Peter Anvin wrote: >> Recently, we have seen an increasing number of problems with gcc 3.4 on >> x86; mostly due to poor constant propagation producing not just bad code >> but failing to properly eliminate what should be dead code. > > I don't see any problem, as, if people are using gcc3, they are probably > not interested on the bleeding edge kernel. > > However, if the problems are just performance/dead code removal, I would > just add a big warning if someone tries to compile x86 with it. I don't > like very much the idea of having different minimum gcc requirements > for each architecture, except if gcc is producing a broken code. > > Currently,Documentation/Changes list just a common minimal list for > everything - although the text describing gcc say that the "version > requirements" may vary for each CPU type. > We already have different gcc version requirements, whether or not they're written down is another matter... -hpa