From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 53090 invoked by alias); 23 Jul 2015 08:59:04 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 53002 invoked by uid 48); 23 Jul 2015 08:59:01 -0000 From: "kkojima at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/66930] [5 Regression]: gengtype.c is miscompiled during stage2 Date: Thu, 23 Jul 2015 08:59:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 5.2.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: kkojima at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 5.3 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-07/txt/msg01961.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66930 --- Comment #8 from Kazumoto Kojima --- (In reply to John Paul Adrian Glaubitz from comment #7) > What do you mean? Using -O1 will trigger all kinds of bugs? Or is it rather > about PR target/66358? Just my 2 cents. Even on the primary targets, bootstrap with other than '-g -O2' are not so well tested. Most packages are built with -O2, aren't they? After all, -O1 should work but not safer than -O2, IMO. O2 does many optimizations, and some of them might cause bug. OTOH, some of them simplify the intermediate code. With -O1, we could see highly complex intermediate code in some cases and they might cause problem. We have just seen an example in this PR.