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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 CA680C0650F for ; Mon, 5 Aug 2019 13:13:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A0A7F2067D for ; Mon, 5 Aug 2019 13:13:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565010823; bh=sEKyctDPn526D1KeohGJuIE9HPDNiKe2i4pehAkUN48=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=a513PKrp1i3pxP9dSJxnqdigUJNBCwkSpU7ebvU/nuBTQu8Gw3MCINT7bssEaN5Og ov41gQ/tRQVGrVBheq1Q0Gomzacg2AcHAChhLxVlxKovn0rem555svRbLatXjgqCJq EYxQHVL9BJqiCXS4XMRkiJ/Kuk7sAF2nOh6uUhsc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730237AbfHENNm (ORCPT ); Mon, 5 Aug 2019 09:13:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:47182 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729321AbfHENI4 (ORCPT ); Mon, 5 Aug 2019 09:08:56 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 33E5B2067D; Mon, 5 Aug 2019 13:08:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565010535; bh=sEKyctDPn526D1KeohGJuIE9HPDNiKe2i4pehAkUN48=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TapZCQzW9XqoBeq6mlslgqTtEIUrDJG39nSicyFP7Za0tMn4zZhGNufVNI7yq9CZz usJJ0ubyadxpjkXXNEIKKiwvI7iosdAc46sXg+RllxfNZrPfMnprNqvkdUI1qCmA9c xoxoqFw9PJXtCAeH6dWGwbgw0DGW6s/516IZU8fE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Masahiro Yamada , Nathan Chancellor , Nick Desaulniers Subject: [PATCH 4.14 33/53] kbuild: initialize CLANG_FLAGS correctly in the top Makefile Date: Mon, 5 Aug 2019 15:02:58 +0200 Message-Id: <20190805124931.821959546@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190805124927.973499541@linuxfoundation.org> References: <20190805124927.973499541@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masahiro Yamada commit 5241ab4cf42d3a93b933b55d3d53f43049081fa1 upstream. CLANG_FLAGS is initialized by the following line: CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) ..., which is run only when CROSS_COMPILE is set. Some build targets (bindeb-pkg etc.) recurse to the top Makefile. When you build the kernel with Clang but without CROSS_COMPILE, the same compiler flags such as -no-integrated-as are accumulated into CLANG_FLAGS. If you run 'make CC=clang' and then 'make CC=clang bindeb-pkg', Kbuild will recompile everything needlessly due to the build command change. Fix this by correctly initializing CLANG_FLAGS. Fixes: 238bcbc4e07f ("kbuild: consolidate Clang compiler flags") Cc: # v5.0+ Signed-off-by: Masahiro Yamada Reviewed-by: Nathan Chancellor Acked-by: Nick Desaulniers Signed-off-by: Greg Kroah-Hartman --- Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/Makefile +++ b/Makefile @@ -427,6 +427,7 @@ KBUILD_AFLAGS_MODULE := -DMODULE KBUILD_CFLAGS_MODULE := -DMODULE KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds GCC_PLUGINS_CFLAGS := +CLANG_FLAGS := export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES @@ -479,7 +480,7 @@ endif ifeq ($(cc-name),clang) ifneq ($(CROSS_COMPILE),) -CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) +CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)