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 3939AC2D0EC for ; Wed, 8 Apr 2020 01:37:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0B0BB2075E for ; Wed, 8 Apr 2020 01:37:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586309856; bh=InGMyG4XwK8m//nC2rpA5UuCFJgflNHEkWbdXkzZRYU=; h=From:To:Cc:Subject:Date:List-ID:From; b=dgNVzfJPnv3W9ldenEJHp5ciFjX0hAPSj1Ho1ikXBZbr3F4ozLGdjKCuOU5cjXX3/ 4GMQsFfJZmZp5gHAnDvsBsOplZGgDHa4mzNCscmFTu2NctIWMFu0fOEZv3lbYNZEEV Rh1sxwA//2RfaPq2V9knKqI4JOtOa61cipQtheS8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726477AbgDHBhf (ORCPT ); Tue, 7 Apr 2020 21:37:35 -0400 Received: from conuserg-12.nifty.com ([210.131.2.79]:51263 "EHLO conuserg-12.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726417AbgDHBhf (ORCPT ); Tue, 7 Apr 2020 21:37:35 -0400 Received: from grover.flets-west.jp (softbank126125134031.bbtec.net [126.125.134.31]) (authenticated) by conuserg-12.nifty.com with ESMTP id 0381aPHj015816; Wed, 8 Apr 2020 10:36:26 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-12.nifty.com 0381aPHj015816 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1586309786; bh=L+PxVczbvSKDZy0QWnkH2JdHG6AtVEb4Ujw81uwS82s=; h=From:To:Cc:Subject:Date:From; b=EYNWU9WnLG7JPzG9hEFTiEiOosaggylbvEyQBUhyARImrmOae8AV4vIs/vRUeFyN6 U/NQS2quG6Vy3yU28X8WbIImFbUjG2qQvonokWVwh4HXR1gpl0bqBE0w7xGxG5ql0a SITtT8BApmOqT74yj9Nb/0jrMn0MPfM0qPddukrkERbWbvCyhamG8Gy+so2IFk9qvq 2Gr/06JnW0V8SL+FQ3dkPLLVrxHIyvhDl6MYy26bYYxfeIOjHt0sjXvoHqb4a6ODHb ot+GJhWG8rzJWIAvCI1KVTgdD/e323ChbaeHDEGpmgMB8cW6FnZO2H5OE2Qxy0sW2s GQmDyx99PoJ1w== X-Nifty-SrcIP: [126.125.134.31] From: Masahiro Yamada To: linux-kbuild@vger.kernel.org Cc: clang-built-linux@googlegroups.com, Fangrui Song , Masahiro Yamada , Jonathan Corbet , Michal Marek , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/2] kbuild: replace AS=clang with LLVM_IAS=1 Date: Wed, 8 Apr 2020 10:36:22 +0900 Message-Id: <20200408013623.31974-1-masahiroy@kernel.org> X-Mailer: git-send-email 2.17.1 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@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_IAS=1, breaking the backward compatibility. Suggested-by: Nick Desaulniers Signed-off-by: Masahiro Yamada Reviewed-by: Nathan Chancellor Reviewed-by: Nick Desaulniers --- Changes in v3: - rename LLVM_IA to LLVM_IAS (per Fangrui Song) 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..0fefdf1737e9 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_IAS=1 to enable it. + Getting Help ------------ diff --git a/Makefile b/Makefile index 1b2691057cb5..a2aadcf8a36c 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_IAS),1) CLANG_FLAGS += -no-integrated-as endif CLANG_FLAGS += -Werror=unknown-warning-option -- 2.17.1