From patchwork Tue Sep 29 21:46:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11807089 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 8E6A4139F for ; Tue, 29 Sep 2020 21:47:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6DD5521548 for ; Tue, 29 Sep 2020 21:47:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="gdAEDDvL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728814AbgI2Vrv (ORCPT ); Tue, 29 Sep 2020 17:47:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48408 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729031AbgI2VrW (ORCPT ); Tue, 29 Sep 2020 17:47:22 -0400 Received: from mail-qt1-x84a.google.com (mail-qt1-x84a.google.com [IPv6:2607:f8b0:4864:20::84a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28ECAC061755 for ; Tue, 29 Sep 2020 14:47:22 -0700 (PDT) Received: by mail-qt1-x84a.google.com with SMTP id p43so4048203qtb.23 for ; Tue, 29 Sep 2020 14:47:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=M/tCJ87SKQnbyhBQptnFDCNgoy9D1scy1+3ph9ahS3g=; b=gdAEDDvLlL0msAdcbIE0elhCADhQmKL9S16dzNU1NewfqdOooSY9iFqACy8+PZ7gHu RjJqXHtJjRJu9BoQC0Z+qcoslnaCbYOM5YVwAUiEbJv8oMPbNKei4NbKX8/eYf1TjsBX LuD//MCUmK3U7ZJ2uod6D1w8OHvoyhKJylEziLAmUyzobSpYb93PY4CL1x+jJuLiN+Df TJvELp9Gtnh21l2Y6CWFhRqKGqHS7xc78jprEFcrRoojdnbVtKont9eEkY55sgaj+pEf r+rlpDV8ZtQQ3iUVmb9timiu1KOz8XTe/0fr94WEPlFW4uof3ENuM7MDtO9p1BgJUAsl mKLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=M/tCJ87SKQnbyhBQptnFDCNgoy9D1scy1+3ph9ahS3g=; b=gl2hhWhNGPKFonyF4zVelfThyWTTSth15R1oMMOmzAkMylQw4QcH0woj3L09BuZMRD Lx9/5qeG0bcfaPETJC/V+TJQwUyDRmblQL1GcYuebFpVzWHszYspKp5Dh1lKcl9M+HDD wUZzwN7zhjfi8Up3Eah4xSq2jDF8FaBt+isM84OY/oNT0VejLEr2ZyXgLfVFJcFPNxHl EoK9nKGcaQnC/h7PlUaqfsNAzkhmtu2WWhzIbj4p+VvhKpS/faOPhTQsapFroJh14pTF 1HLPxdLBPHoAeYWsAYsCg6+avowtBR1ShDhtlt0YThRmcBzKFw++sB8BCQ68VDp7XdMn kWbw== X-Gm-Message-State: AOAM532++aZjqvc+6xArPojD0zXalrAnDymRzzK4I2gSYCvWrPu0zYbE Jhjvmd9bTs9VFuTkAMdM4whXFnxOMvzZa1pjDMs= X-Google-Smtp-Source: ABdhPJwIclf1YZILYpRHL9aLGjIyClVObMTVmWZ7pfwr9sU8b01qvKeenw3eQ8lUfzBJlACcTh5VbLCas1CqVTaKm1c= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:ad4:58c7:: with SMTP id dh7mr6716936qvb.20.1601416041280; Tue, 29 Sep 2020 14:47:21 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:23 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-22-samitolvanen@google.com> Mime-Version: 1.0 References: <20200929214631.3516445-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 21/29] scripts/mod: disable LTO for empty.c From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: Peter Zijlstra , 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 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: Kees Cook --- scripts/mod/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile index 78071681d924..c9e38ad937fd 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-always-y += modpost mk_elfconfig always-y += empty.o