From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 79567 invoked by alias); 11 Apr 2015 17:12:42 -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 79243 invoked by uid 48); 11 Apr 2015 17:12:37 -0000 From: "howarth.at.gcc at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug bootstrap/65733] gcc 4.9.2 suffers bootstrap comparison failures with clang 3.5.1 and later. Date: Sat, 11 Apr 2015 17:12:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: bootstrap X-Bugzilla-Version: 5.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: howarth.at.gcc at gmail dot com X-Bugzilla-Status: RESOLVED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- 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: 2015-04/txt/msg00959.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65733 --- Comment #12 from Jack Howarth --- It appears that clang 3.5 and later defaults to setting the CIE version to dwarf2 in the absence of -g. This behavior can't be overridden by passing -gdwarf-3 in the absence of -g. However the gcc configure test failure can be suppressed under clang by appending -gdwarf-2 instead (to downgrade the CIE version to dwarf3 in the presence of -g).