From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27722 invoked by alias); 4 May 2011 21:29:11 -0000 Received: (qmail 27713 invoked by uid 22791); 4 May 2011 21:29:10 -0000 X-SWARE-Spam-Status: No, hits=-2.7 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 04 May 2011 21:28:56 +0000 From: "mikpe at it dot uu.se" To: gcc-bugs@gcc.gnu.org Subject: [Bug bootstrap/48679] [4.7 regression] bootstrap comparison failures on m68k-linux X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: bootstrap X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: mikpe at it dot uu.se X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.7.0 X-Bugzilla-Changed-Fields: CC Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Wed, 04 May 2011 21:29:00 -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 X-SW-Source: 2011-05/txt/msg00384.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48679 Mikael Pettersson changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |vmakarov at gcc dot gnu.org --- Comment #3 from Mikael Pettersson 2011-05-04 21:26:22 UTC --- Bisection identified Vladimir Makarov's big IRA update in r171649 as the source of this regression. gcc-4.7-20110326 (r171562) builds OK if the PR48332 fix is pre-applied, but gcc-4.7-20110402 (r171894) fails with massive bootstrap comparison failures. Bisecting between these points was a pain because almost all bisection points failed to build due to ICEs, however bisection narrowed in on r171649. I then collected the fixes for all known regression from r171649 (I counted 9 of them), and redid the bisection with relevant fixes pre-applied. This time the builds did not ICE but failed after stage 3 with bootstrap comparison failures. Again bisection identified r171649. Finally I built gcc-4.7-20110402 (r171894) with all IRA changes from r171649 to r171894 reverted, and that bootstrapped fine.