From patchwork Wed Jun 24 20:31:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11624185 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C3C7C913 for ; Wed, 24 Jun 2020 20:33:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ABD6C2100A for ; Wed, 24 Jun 2020 20:33:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="hwKULFJx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406541AbgFXUdX (ORCPT ); Wed, 24 Jun 2020 16:33:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406539AbgFXUdW (ORCPT ); Wed, 24 Jun 2020 16:33:22 -0400 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 4405BC0613ED for ; Wed, 24 Jun 2020 13:33:22 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id e20so3467117ybc.23 for ; Wed, 24 Jun 2020 13:33:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=AKMu7RfRr5zvA7HsB83o+xQyox7udGa4dX0knD98vpQ=; b=hwKULFJxGC6lzKBnQLuceB0YfBkygKMN1Y7kZQBIXHCsEuVKl7k53XBbhlEet2kuY6 c5h57Jm4RTz3npco+GM34bS8OimyDEzCAs5RtXK9amKrkhc3iWeXVSSos5q0no8zlKoC g7pLlix/dBDvLN2ZPktXFsba5h3mffSKhoE5+GmDS8Vr6JOxA4ewukdjiiGEPv8wdNVT NFihuGuX3xW6/cOtws4+jn8A9DLBsarXxdSvLrg+AB01n3pWOgDMboQG92CgRsUahvu2 9lqJTUHzdlliTFgZhjxMp/9FS3YVs31mDAc+87qMDsCYIvXwnXEZPUfskY1g7XwXJnjL oU3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=AKMu7RfRr5zvA7HsB83o+xQyox7udGa4dX0knD98vpQ=; b=R7SAwm2viMC8TECVrUIYeyimNhXdcDintIvY0IOiyG1JpQdtj0iM1mozctBFUxlut0 /Pj/LngZtKwzSn2VH8R9nALJfrP4i1XPG8CxFygMLDuUNw9FTlV1KPTsUDIkviT1Ir7j wDWNyICATpXn+Cih7loHM45cTZFsimd1ee8lcAQhziRcVfC8KJJCsrezKwE8hurHSn1E p6SwnhZW9UT8waGGPVGKH4DB31kIWpGw0FE59MghDTeDWdsInjtP2j3zqZoh040/KWMF ACtKcAVM1BJFc5tAn0aMuNEUY84sFvjk5ISrl5TdBO+cBEmAPaNajucE9i4R39wlAXCu nbLQ== X-Gm-Message-State: AOAM5334lVLr2MsuaozzGq09CLyMbosWYLhIUGsIZBSbxp0dt3NGInAG lNbQ7oqPvPB39bN7woioLtUk2orMyAguHxjJQqs= X-Google-Smtp-Source: ABdhPJwsJ60waNyWplHPwTwdw+lH2n4awv5MY2TpgjYhyfFuYQs+mtvKBzjvblN4Mn7p7o+48GiQMs2cNGX9hzUSV7k= X-Received: by 2002:a25:dcb:: with SMTP id 194mr50401188ybn.226.1593030801479; Wed, 24 Jun 2020 13:33:21 -0700 (PDT) Date: Wed, 24 Jun 2020 13:31:51 -0700 In-Reply-To: <20200624203200.78870-1-samitolvanen@google.com> Message-Id: <20200624203200.78870-14-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> X-Mailer: git-send-email 2.27.0.212.ge8ba1cc988-goog Subject: [PATCH 13/22] scripts/mod: disable LTO for empty.c From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org, Sami Tolvanen Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object files. As empty.o is used for probing target properties, disable LTO for it to produce an object file instead. Signed-off-by: Sami Tolvanen Reviewed-by: Nick Desaulniers --- scripts/mod/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile index 296b6a3878b2..b6e3b40c6eeb 100644 --- a/scripts/mod/Makefile +++ b/scripts/mod/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 OBJECT_FILES_NON_STANDARD := y +CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO) hostprogs := modpost mk_elfconfig always-y := $(hostprogs) empty.o