From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 143D3C2D0EC for ; Tue, 7 Apr 2020 18:44:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE7432075E for ; Tue, 7 Apr 2020 18:44:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586285070; bh=8RRjH68DqqAxky1+NDDYWTakK8zvBWeAWjk22BZRmdA=; h=From:To:Cc:Subject:Date:List-ID:From; b=0VJcsu+gnytTdZ74JHyzRCwjHU6o4dMvsVa7xbQKQiUh3GqRnjKxl1jZwnd1nNCzn ExHDzJjHhLSyKZbSde270FsyvmCXX+fFzGT7Z+5OUlc0oz89r6QsHC7AVTjbC4IwqI B+zfUrJ6iMuS19KnfFuWE9T3nCFZiwuCdXSUURNc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726881AbgDGSo3 (ORCPT ); Tue, 7 Apr 2020 14:44:29 -0400 Received: from conuserg-07.nifty.com ([210.131.2.74]:37547 "EHLO conuserg-07.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726277AbgDGSo3 (ORCPT ); Tue, 7 Apr 2020 14:44:29 -0400 Received: from grover.flets-west.jp (softbank126125134031.bbtec.net [126.125.134.31]) (authenticated) by conuserg-07.nifty.com with ESMTP id 037IhjLN002999; Wed, 8 Apr 2020 03:43:46 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-07.nifty.com 037IhjLN002999 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1586285026; bh=/yE3LtMyJqmOAt80CTdVzlZEIo8PmfJ0HPkqvDRfiHw=; h=From:To:Cc:Subject:Date:From; b=vslyEss3HgL6TFI+NV5adg9iEdqzvyVhB6k42WIqKa/xMGD2qZ58lVcts2Jzs9uBe sDROrOFLyTHN1gozmIaOLAK+vDpbxQMdH4QeeWN0DqFMBX+1aI6k5f0LsF//K+Cg1P b53Orq1U3cDQMlfhqW3w7bafXpuxr608ve5JK51HQkAyhxOrCA/LuR19Xa1EbLoGNU JoVgnhBqgpxnFycAhUqrE4BaLLHCtPmahPxGuaHOLdKv9p1FiTVHBm/xXARyigwUa8 Gdn7J7MnGzlJMRhHaEFLAzEQcEjQFoh2V85YRFC2u8uyqh4sR8TiuEhQlK/EyCu1Bq PaHzhLjE6D20A== X-Nifty-SrcIP: [126.125.134.31] From: Masahiro Yamada To: linux-kbuild@vger.kernel.org Cc: clang-built-linux@googlegroups.com, Masahiro Yamada , Jonathan Corbet , Michal Marek , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] kbuild: replace AS=clang with LLVM_IA=1 Date: Wed, 8 Apr 2020 03:43:35 +0900 Message-Id: <20200407184336.14612-1-masahiroy@kernel.org> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The 'AS' variable is unused for building the kernel. Only the remaining usage is to turn on the integrated assembler. A boolean flag is a better fit for this purpose. AS=clang was added for experts. So, I replaced it with LLVM_IA=1, breaking the backward compatibility. Suggested-by: Nick Desaulniers Signed-off-by: Masahiro Yamada --- Changes in v2: - new patch Documentation/kbuild/llvm.rst | 5 ++++- Makefile | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst index eefbdfa3e4d9..2b40afa58049 100644 --- a/Documentation/kbuild/llvm.rst +++ b/Documentation/kbuild/llvm.rst @@ -50,11 +50,14 @@ LLVM Utilities LLVM has substitutes for GNU binutils utilities. These can be invoked as additional parameters to `make`. - make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\ + make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\ OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\ READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\ HOSTLD=ld.lld +Currently, the integrated assembler is disabled by default. You can pass +LLVM_IA=1 to enable it. + Getting Help ------------ diff --git a/Makefile b/Makefile index 1b2691057cb5..f9beb696d6d3 100644 --- a/Makefile +++ b/Makefile @@ -538,7 +538,7 @@ endif ifneq ($(GCC_TOOLCHAIN),) CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) endif -ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),) +ifneq ($(LLVM_IA),1) CLANG_FLAGS += -no-integrated-as endif CLANG_FLAGS += -Werror=unknown-warning-option -- 2.17.1