From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 103205 invoked by alias); 30 May 2017 09:43:29 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 103183 invoked by uid 89); 30 May 2017 09:43:28 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.2 spammy= X-HELO: smtp.eu.adacore.com Received: from mel.act-europe.fr (HELO smtp.eu.adacore.com) (194.98.77.210) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Tue, 30 May 2017 09:43:27 +0000 Received: from localhost (localhost [127.0.0.1]) by filtered-smtp.eu.adacore.com (Postfix) with ESMTP id 42F3D81309; Tue, 30 May 2017 11:43:28 +0200 (CEST) Received: from smtp.eu.adacore.com ([127.0.0.1]) by localhost (smtp.eu.adacore.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id g539MXQ5qKOV; Tue, 30 May 2017 11:43:28 +0200 (CEST) Received: from polaris.localnet (bon31-6-88-161-99-133.fbx.proxad.net [88.161.99.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.eu.adacore.com (Postfix) with ESMTPSA id A253481300; Tue, 30 May 2017 11:43:27 +0200 (CEST) From: Eric Botcazou To: Richard Biener Cc: gcc-patches@gcc.gnu.org, Martin =?utf-8?B?TGnFoWth?= , Jakub Jelinek Subject: Re: [RFC] [PATCH] Introduce configure flag --with-stage1-cflags. Date: Tue, 30 May 2017 10:30:00 -0000 Message-ID: <8222700.x4IQrGbyC3@polaris> User-Agent: KMail/4.14.10 (Linux/3.16.7-53-desktop; KDE/4.14.9; x86_64; ; ) In-Reply-To: References: <41109217-1bf5-b112-e783-8040196fd410@suse.cz> <6237251.LWo8Wt74zX@polaris> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-SW-Source: 2017-05/txt/msg02246.txt.bz2 > Are you sure? In my experience -O2 gets the most test coverage during > lifetime of a particular release. Yes, some older GCC releases have aliasing issues that are exposed at -O2 only because of -fstrict-aliasing and -fschedule-insns. -- Eric Botcazou