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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 2EFF9C35640 for ; Fri, 21 Feb 2020 08:32:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EFF2C20578 for ; Fri, 21 Feb 2020 08:32:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582273934; bh=FSZNZhAOFhYYMThmr+oCAnsLgXdPEgdWYjoPiw6Ulfs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZQyqXFpCjC9Q6uB1x0+gKpRdH563Es9l98D6FPDav1Fw2J07PYRcm4rm0hM9tq+v/ dUDi8ckH3Tu+09RhfvKI1Wt+uzC430EZVR+S7BWc7YMnKhR2vZVYtJ8qctfChjkqtn /aF62taWVJqIz+d0LZaHsE1QAr1DK6pRnvEcp1JU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732697AbgBUIND (ORCPT ); Fri, 21 Feb 2020 03:13:03 -0500 Received: from mail.kernel.org ([198.145.29.99]:49008 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732376AbgBUINC (ORCPT ); Fri, 21 Feb 2020 03:13:02 -0500 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 7D8AE20722; Fri, 21 Feb 2020 08:13:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582272782; bh=FSZNZhAOFhYYMThmr+oCAnsLgXdPEgdWYjoPiw6Ulfs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RJzE7lbK4xApE3uQGMD5ZXgQI4wadO9Qzp7Ll7nAViM5fgwSmjEYDI/glVNUCX0Tz NsTMEyVJnhnycD9Id/kCzvjE2TLlFtmjicc9illXFUS3RgeHawYAlgS+UXmkAGgo6b XkKuoaqxH6uVvjXzhol9HvNmuQ2JKOAGxcP+iYuc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Masahiro Yamada , Sasha Levin Subject: [PATCH 5.4 273/344] kbuild: use -S instead of -E for precise cc-option test in Kconfig Date: Fri, 21 Feb 2020 08:41:12 +0100 Message-Id: <20200221072414.510202665@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200221072349.335551332@linuxfoundation.org> References: <20200221072349.335551332@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Masahiro Yamada [ Upstream commit 3bed1b7b9d79ca40e41e3af130931a3225e951a3 ] Currently, -E (stop after the preprocessing stage) is used to check whether the given compiler flag is supported. While it is faster than -S (or -c), it can be false-positive. You need to run the compilation proper to check the flag more precisely. For example, -E and -S disagree about the support of "--param asan-instrument-allocas=1". $ gcc -Werror --param asan-instrument-allocas=1 -E -x c /dev/null -o /dev/null $ echo $? 0 $ gcc -Werror --param asan-instrument-allocas=1 -S -x c /dev/null -o /dev/null cc1: error: invalid --param name ‘asan-instrument-allocas’; did you mean ‘asan-instrument-writes’? $ echo $? 1 Signed-off-by: Masahiro Yamada Signed-off-by: Sasha Levin --- scripts/Kconfig.include | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index d4adfbe426903..bfb44b265a948 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -25,7 +25,7 @@ failure = $(if-success,$(1),n,y) # $(cc-option,) # Return y if the compiler supports , n otherwise -cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o /dev/null) +cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /dev/null) # $(ld-option,) # Return y if the linker supports , n otherwise -- 2.20.1