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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 2A3E9C433DB for ; Sat, 6 Feb 2021 03:04:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE79B64F92 for ; Sat, 6 Feb 2021 03:04:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232123AbhBFDEQ (ORCPT ); Fri, 5 Feb 2021 22:04:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38404 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231391AbhBFCin (ORCPT ); Fri, 5 Feb 2021 21:38:43 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 481CDC06178C for ; Fri, 5 Feb 2021 14:01:29 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id x4so8656742ybj.22 for ; Fri, 05 Feb 2021 14:01:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:message-id:mime-version:subject:from:to:cc; bh=vfoNqgpFnWRNHkVjKwQ8AkyS8YshOlfTiuGJMTgmnlQ=; b=dp4CNzNONIwItj/Vy/dbeHXrpuLQnLCG4XA3mFtrmRoEaXpPY7zxYvX7Djotz41aSn quumVyPpvuJMXkTz2EzkS/ft5SNINKzLHe5QchX2SP0KDTDrutv0mYZ4aEKKOnDcwAWA xiT495jp84bZXz64FXT7FkpCdbbYizxTIWPwIs+xbnqGVbgm+82j61rmJDip10DkgQnc YbDcL+NBbcT6F7YbHf0Yn297PCOBmsqI4QekarKu9j1FRdhBC4h5rlqAViuTZ2VG/UVZ Vp6A9FvKrlEhvShlfkeoUVj9Y0PSfbz6w9GG7XPhqkVLT2r4wBkDApitjRUBg4o+n85f YmhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:message-id:mime-version:subject:from :to:cc; bh=vfoNqgpFnWRNHkVjKwQ8AkyS8YshOlfTiuGJMTgmnlQ=; b=nilk2FNKuL0v8Yk2V16vrfNeWfd6hM4DpTssx+V4aOMEm/d8WGLFOYcqRJO0nmM724 ftC4Nfm4cQN0v5qivugcGh77YKZKd4bDmHLWTssATZY8u0mVzL1nrA8UAZBetnHXDwOw /KCFCCNHU1fYnbqdaE7cN0PXZib1AK/Wc/RljoVDsgzqPUMCdzeEl17kYDxQVI2BtFqs XUnvGkTQ7YLibBltaU7vQQNXBVFm3HxR0mEzQnaENcydGVTDetv7O9bQhzoQH4V/eaPx 7/Xv2B+qdrKMQEBu46h4u8GUK5VCqyLHVBRbgL0morzoRzZezV+4Cr0K0Kd9xQOUxt7+ r/Gg== X-Gm-Message-State: AOAM530TyL3mh1e6WGlvhDGPl82rPbgVCoo2r7zCc06U/pa14R4OhxiE jM1Dy53qN48P497qIXx1lLTJ5HSPzoNWnLEBJ+c= X-Google-Smtp-Source: ABdhPJwmXa8T2NxOoAX4Ie67xVdkuZ+8Bst4zffqBopO0QAY71XQaJAt9x8A/lAcZ4s04uiSF1XDQ6tnumbxrshBkyc= Sender: "ndesaulniers via sendgmr" X-Received: from ndesaulniers1.mtv.corp.google.com ([2620:15c:211:202:fce9:1439:f67f:bf26]) (user=ndesaulniers job=sendgmr) by 2002:a25:df48:: with SMTP id w69mr9484024ybg.85.1612562488516; Fri, 05 Feb 2021 14:01:28 -0800 (PST) Date: Fri, 5 Feb 2021 14:01:25 -0800 Message-Id: <20210205220125.2931504-1-ndesaulniers@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog Subject: [PATCH] Makefile: reuse CC_VERSION_TEXT From: Nick Desaulniers To: Masahiro Yamada Cc: Nick Desaulniers , Michal Marek , Nathan Chancellor , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I noticed we're invoking $(CC) via $(shell) more than once to check the version. Let's reuse the first string captured in $CC_VERSION_TEXT. Fixes: 315bab4e972d ("kbuild: fix endless syncconfig in case arch Makefile sets CROSS_COMPILE") Signed-off-by: Nick Desaulniers --- Makefile | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/Makefile b/Makefile index a85535eb6a7d..70034d7c1051 100644 --- a/Makefile +++ b/Makefile @@ -557,7 +557,13 @@ ifdef building_out_of_srctree { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore endif -ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) +# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. +# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. +# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), +# and from include/config/auto.conf.cmd to detect the compiler upgrade. +CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) + +ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) ifneq ($(CROSS_COMPILE),) CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) @@ -576,12 +582,6 @@ KBUILD_AFLAGS += $(CLANG_FLAGS) export CLANG_FLAGS endif -# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. -# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. -# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), -# and from include/config/auto.conf.cmd to detect the compiler upgrade. -CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) - ifdef config-build # =========================================================================== # *config targets only - make sure prerequisites are updated, and descend -- 2.30.0.478.g8a0d178c01-goog