Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932533AbVL1Lrd (ORCPT ); Wed, 28 Dec 2005 06:47:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932529AbVL1Lrd (ORCPT ); Wed, 28 Dec 2005 06:47:33 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:60343 "EHLO mx3.mail.elte.hu") by vger.kernel.org with ESMTP id S932528AbVL1LrU (ORCPT ); Wed, 28 Dec 2005 06:47:20 -0500 Date: Wed, 28 Dec 2005 12:47:01 +0100 From: Ingo Molnar To: lkml Cc: Linus Torvalds , Andrew Morton , Arjan van de Ven , Matt Mackall Subject: [patch 02/2] allow gcc4 to optimize unit-at-a-time Message-ID: <20051228114701.GC3003@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=AWL autolearn=no SpamAssassin version=3.0.3 0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1448 Lines: 34 allow gcc4 compilers to optimize unit-at-a-time - which results in gcc having a wider scope when optimizing. This also results in smaller code when optimizing for size. (gcc4 does not have the stack footprint problem of gcc3 compilers.) Signed-off-by: Ingo Molnar Signed-off-by: Arjan van de Ven ---- arch/i386/Makefile | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) Index: linux/arch/i386/Makefile =================================================================== --- linux.orig/arch/i386/Makefile +++ linux/arch/i386/Makefile @@ -42,9 +42,9 @@ include $(srctree)/arch/i386/Makefile.cp GCC_VERSION := $(call cc-version) cflags-$(CONFIG_REGPARM) += $(shell if [ $(GCC_VERSION) -ge 0300 ] ; then echo "-mregparm=3"; fi ;) -# Disable unit-at-a-time mode, it makes gcc use a lot more stack -# due to the lack of sharing of stacklots. -CFLAGS += $(call cc-option,-fno-unit-at-a-time) +# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use +# a lot more stack due to the lack of sharing of stacklots: +CFLAGS += $(shell if [ $(GCC_VERSION) -lt 0400 ] ; then echo "-fno-unit-at-a-time"; fi ;) CFLAGS += $(cflags-y) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/