From patchwork Tue Mar 2 21:06:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 12112611 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 719D2C43603 for ; Wed, 3 Mar 2021 01:42:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 43DD164E09 for ; Wed, 3 Mar 2021 01:42:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236415AbhCCBd3 (ORCPT ); Tue, 2 Mar 2021 20:33:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:36554 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1448121AbhCBVHt (ORCPT ); Tue, 2 Mar 2021 16:07:49 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0078F64F21; Tue, 2 Mar 2021 21:07:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614719228; bh=kO8DfkWWn8yJyBWkrJ8uGc4QnsuaOIDHHPdOvD5JeW4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aSncCNNaLdk307eMDzS91kz/dO8BB50d+1ffmwITyoSBQOgxtYbGPkxPHi8o+O/W3 09QiRD0vjRa8NNXVGdZdrZ7PDLsUQR+m5Aw8w9I+ynfIR7ErnwzkmG6wLrYrIF88Oc wDCvTd4uFXCbd8j8m4iZQ+SZHf/nYbpIVx3wW1Xq7MWVWlPLq750+ukhdTndRAvAfH ZFYLhBv/4NRNehjYEqFPvSYe6A81OLbXwihh7MYxWY4BBTQgfTjSoetlVQ+Kiq3ctZ s1APws0lg2lBVOeKKctgV8B+FBipATUzkqGO2BQCV72sv3XO4wF40bCbAHzQ63vDyE 6+rNEfLNqkUFA== From: Nathan Chancellor To: Masahiro Yamada , Michal Marek , Nick Desaulniers Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nathan Chancellor Subject: [PATCH 2/2] Makefile: Only specify '--prefix=' when building with clang + GNU as Date: Tue, 2 Mar 2021 14:06:46 -0700 Message-Id: <20210302210646.3044738-2-nathan@kernel.org> X-Mailer: git-send-email 2.31.0.rc0.75.gec125d1bc1 In-Reply-To: <20210302210646.3044738-1-nathan@kernel.org> References: <20210302210646.3044738-1-nathan@kernel.org> MIME-Version: 1.0 X-Patchwork-Bot: notify Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org When building with LLVM_IAS=1, there is no point to specifying '--prefix=' because that flag is only used to find the cross assembler, which is clang itself when building with LLVM_IAS=1. All of the other tools are invoked directly from PATH or a full path specified via the command line, which does not depend on the value of '--prefix='. Sharing commands to reproduce issues becomes a little bit easier without a '--prefix=' value because that '--prefix=' value is specific to a user's machine due to it being an absolute path. Signed-off-by: Nathan Chancellor Reviewed-by: Fangrui Song Reviewed-by: Nick Desaulniers Tested-by: Nick Desaulniers Reported-by: kernel test robot Reported-by: kernel test robot --- Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Makefile b/Makefile index c20f0ad8be73..0413b8c594cd 100644 --- a/Makefile +++ b/Makefile @@ -566,12 +566,12 @@ CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) ifneq ($(CROSS_COMPILE),) CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) +ifneq ($(LLVM_IAS),1) GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) -endif -ifneq ($(LLVM_IAS),1) CLANG_FLAGS += -no-integrated-as endif +endif CLANG_FLAGS += -Werror=unknown-warning-option KBUILD_CFLAGS += $(CLANG_FLAGS) KBUILD_AFLAGS += $(CLANG_FLAGS)