From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com ([134.134.136.65]:30248 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752275AbdK0Veb (ORCPT ); Mon, 27 Nov 2017 16:34:31 -0500 From: Andi Kleen Subject: [PATCH 21/21] x86: Enable Link Time Optimization Date: Mon, 27 Nov 2017 13:34:23 -0800 Message-Id: <20171127213423.27218-22-andi@firstfloor.org> In-Reply-To: <20171127213423.27218-1-andi@firstfloor.org> References: <20171127213423.27218-1-andi@firstfloor.org> Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, samitolvanen@google.com, alxmtvv@gmail.com, linux-kbuild@vger.kernel.org, yamada.masahiro@socionext.com, akpm@linux-foundation.org, Andi Kleen From: Andi Kleen LTO is opt-in per architecture because it usually needs some fixes. LTO needs THIN_ARCHIVES because standard binutils doesn't like mixing assembler and LTO code with ld -r. Enable LTO and THIN_ARCHIVES for x86 Signed-off-by: Andi Kleen --- arch/x86/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8eed3f94bfc7..92650726f908 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -122,6 +122,8 @@ config X86 select HAVE_ARCH_VMAP_STACK if X86_64 select HAVE_ARCH_WITHIN_STACK_FRAMES select HAVE_CC_STACKPROTECTOR + select THIN_ARCHIVES if LTO + select ARCH_SUPPORTS_LTO select HAVE_CMPXCHG_DOUBLE select HAVE_CMPXCHG_LOCAL select HAVE_CONTEXT_TRACKING if X86_64 -- 2.13.6