From owner-dev-commits-src-all@freebsd.org Tue Aug 24 14:06:02 2021 Return-Path: Delivered-To: dev-commits-src-all@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 8737D6581D4; Tue, 24 Aug 2021 14:06:02 +0000 (UTC) (envelope-from git@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 "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Gv9rB2s2jz533Z; Tue, 24 Aug 2021 14:06:02 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (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 4102F1C96; Tue, 24 Aug 2021 14:06:02 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 17OE62li074574; Tue, 24 Aug 2021 14:06:02 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 17OE62Cq074573; Tue, 24 Aug 2021 14:06:02 GMT (envelope-from git) Date: Tue, 24 Aug 2021 14:06:02 GMT Message-Id: <202108241406.17OE62Cq074573@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Jessica Clarke Subject: git: c1f7d8dd23db - main - clang: Build with -fno-strict-aliasing when using GCC MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: jrtc27 X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: c1f7d8dd23db693106fcd66e0b1766a3f3194670 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Aug 2021 14:06:02 -0000 The branch main has been updated by jrtc27: URL: https://cgit.FreeBSD.org/src/commit/?id=c1f7d8dd23db693106fcd66e0b1766a3f3194670 commit c1f7d8dd23db693106fcd66e0b1766a3f3194670 Author: Jessica Clarke AuthorDate: 2021-08-24 13:59:36 +0000 Commit: Jessica Clarke CommitDate: 2021-08-24 14:04:25 +0000 clang: Build with -fno-strict-aliasing when using GCC Somewhat ironically, there are strict aliasing violations in Clang, which can result in the following assertion failure: Assertion `*(NamedDecl **)&Data == ND && "PointerUnion mangles the NamedDecl pointer!"' failed. Upstream's clang/CMakeLists.txt specifically (not LLVM as a whole) passes -fno-strict-aliasing if the compiler is not Clang, and this fixes the above issue. This was seen when cross-building from Linux using a bootstrap compiler, but likely also affects worlds built with a new enough external GCC toolchain. MFC after: 1 week Reviewed by: dim Differential Revision: https://reviews.freebsd.org/D31533 --- lib/clang/clang.build.mk | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/clang/clang.build.mk b/lib/clang/clang.build.mk index 0d3151178eb9..fb64b16935f2 100644 --- a/lib/clang/clang.build.mk +++ b/lib/clang/clang.build.mk @@ -13,4 +13,6 @@ CFLAGS+= -DCLANG_ENABLE_ARCMT CFLAGS+= -DCLANG_ENABLE_STATIC_ANALYZER .endif +CFLAGS.gcc+= -fno-strict-aliasing + .include "llvm.build.mk"