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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 A9285C43461 for ; Thu, 10 Sep 2020 21:11:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3252A221E2 for ; Thu, 10 Sep 2020 21:11:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599772279; bh=mqp67qBEfIuJMcFbaE/f7w2VhxS4oPSI3AMk242sSCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vcAdZ8OAkU+el1uDxlOn5odn+GaxBfiIuSk/Gn/MEUFt7LkaQgH5nbNzZjL2Gsec/ 5H7bh+omAa041l76A4w4i3je30Uy9V1ywsKwf799Aj+DPiVAUW2opFO1HDoDVibxXk bTUQwRBKm7MNoRsBht82lIQRRh+vVZo2aFaEIND8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727835AbgIJVLN (ORCPT ); Thu, 10 Sep 2020 17:11:13 -0400 Received: from condef-05.nifty.com ([202.248.20.70]:48209 "EHLO condef-05.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731166AbgIJOen (ORCPT ); Thu, 10 Sep 2020 10:34:43 -0400 Received: from conuserg-10.nifty.com ([10.126.8.73])by condef-05.nifty.com with ESMTP id 08ADsiG3031431; Thu, 10 Sep 2020 22:54:45 +0900 Received: from oscar.flets-west.jp (softbank126090211135.bbtec.net [126.90.211.135]) (authenticated) by conuserg-10.nifty.com with ESMTP id 08ADpSIw001308; Thu, 10 Sep 2020 22:51:30 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-10.nifty.com 08ADpSIw001308 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1599745891; bh=wXl8du5fQhGV7mBkLY962W3rgMjpZxKVsM/SEXRS3J8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JyBBb5kLp2N76xsz+5D18ojWUBSRwP4DCXi86XTh0zqLNtsGHqeIIEmEVKl+H09p+ GUcZSK5FrUXi/dTaPwmIWCKA8e7OMFkG9Gf89WeJJngR+kuUgVBrKjRxX9fSQDD+J7 IZerFkkD+a4EEkhuMsDXOo4bqa7tJpaBcKxNrqD8v5b/N/5GPBIAClGAgGFKc79Qie Ypm9vcgmPWiu3FlJzM7z5WPL7HfYdtOGgzT4bL7On/7bufH0d3IF8nhpsvCZ3nMvMN jdjLpldSliX52wzsZYCQJpr/AxfmlrZsO2ovZWzJE9l1HX6RbPJg82DZX+FxZL7bXM a+Qr2TTs61ULg== X-Nifty-SrcIP: [126.90.211.135] From: Masahiro Yamada To: linux-kbuild@vger.kernel.org Cc: Ingo Molnar , Masahiro Yamada , Michal Marek , Nathan Chancellor , Nick Desaulniers , clang-built-linux@googlegroups.com, linux-kernel@vger.kernel.org Subject: [PATCH 2/4] kbuild: remove cc-option test of -fno-merge-all-constants Date: Thu, 10 Sep 2020 22:51:18 +0900 Message-Id: <20200910135120.3527468-2-masahiroy@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200910135120.3527468-1-masahiroy@kernel.org> References: <20200910135120.3527468-1-masahiroy@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The minimal compiler versions, GCC 4.9 and Clang 10 support this flag. Here is the godbolt: https://godbolt.org/z/8T4177 Signed-off-by: Masahiro Yamada --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 059b36f2ea53..1b6abecc5cab 100644 --- a/Makefile +++ b/Makefile @@ -927,7 +927,7 @@ KBUILD_CFLAGS += -fno-strict-overflow # clang sets -fmerge-all-constants by default as optimization, but this # is non-conforming behavior for C and in fact breaks the kernel, so we # need to disable it here generally. -KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) +KBUILD_CFLAGS += -fno-merge-all-constants # for gcc -fno-merge-all-constants disables everything, but it is fine # to have actual conforming behavior enabled. -- 2.25.1