From owner-freebsd-bugs@freebsd.org Wed Jun 3 16:52:33 2020 Return-Path: Delivered-To: freebsd-bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 50CD933B6C8 for ; Wed, 3 Jun 2020 16:52:33 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 49cZhd1Xd0z3ZJg for ; Wed, 3 Jun 2020 16:52:33 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 3493933B5DB; Wed, 3 Jun 2020 16:52:33 +0000 (UTC) Delivered-To: bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 345AC33B8C1 for ; Wed, 3 Jun 2020 16:52:33 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 49cZhd0j10z3ZJf for ; Wed, 3 Jun 2020 16:52:33 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 138A911500 for ; Wed, 3 Jun 2020 16:52:33 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 053GqWBS096081 for ; Wed, 3 Jun 2020 16:52:32 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from bugzilla@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 053GqWZd096080 for bugs@FreeBSD.org; Wed, 3 Jun 2020 16:52:32 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: bugzilla set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 246630] stable/11 regression: base.txz reproducibility depends on number of cpu cores Date: Wed, 03 Jun 2020 16:52:32 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: Unspecified X-Bugzilla-Keywords: regression X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: commit-hook@freebsd.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Jun 2020 16:52:33 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246630 --- Comment #27 from commit-hook@freebsd.org --- A commit references this bug: Author: dim Date: Wed Jun 3 16:51:30 UTC 2020 New revision: 361755 URL: https://svnweb.freebsd.org/changeset/base/361755 Log: Disable clang's -fintegrated-cc1 stage by default In bug 246630, it was found that part of the rescue binary could be compiled to very slightly different (but still equivalent) machine code, depending on the number of simultaneous make jobs (via the -j option). This turned out to be caused by the upstream change that made clang's first stage compiler (i.e. the -cc1 stage) run as part of the initial clang process invocation, instead of forking and exec'ing a new clang process. We are currently investigating the root cause for the difference in output, but while that is ongoing, disable the integrated cc1 stage for now to work around it. You can always turn it on explicitly by using the -fintegrated-cc1 option, or turn it off with -fno-integrated-cc1. Direct commit to stable/{11,12}, so this can hopefully end up in the upcoming 11.4-RELEASE. Reported by: Fabian Keil PR: 246630 Changes: stable/11/lib/clang/include/clang/Config/config.h stable/12/lib/clang/include/clang/Config/config.h --=20 You are receiving this mail because: You are the assignee for the bug.=