Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262439AbTHYWrl (ORCPT ); Mon, 25 Aug 2003 18:47:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262441AbTHYWrl (ORCPT ); Mon, 25 Aug 2003 18:47:41 -0400 Received: from hermes.fachschaften.tu-muenchen.de ([129.187.202.12]:37851 "HELO hermes.fachschaften.tu-muenchen.de") by vger.kernel.org with SMTP id S262439AbTHYWrZ (ORCPT ); Mon, 25 Aug 2003 18:47:25 -0400 Date: Tue, 26 Aug 2003 00:47:17 +0200 From: Adrian Bunk To: linux-kernel@vger.kernel.org Cc: spyro@f2s.com, linux-arm-kernel@lists.arm.linux.org.uk, Yoshinori Sato Subject: [2.6 patch] add a config option for -Os Message-ID: <20030825224717.GZ7038@fs.tum.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2964 Lines: 94 The patch below adds a config option for compiling the kernel with -Os. Compared to the last patch, the option moved to the embedded to the General Setup menu and depends on EXPERIMENTAL instead of EMBEDDED (retionale: it might even produce a faster kernel but it's less tested). I removed the special cases in the arm, arm26 and h8300 Makefiles, users on these architectures can now use OPTIMIZE_FOR_SIZE. Compiling with this option enabled produced a working kernel for me on i386. cu Adrian --- linux-2.6.0-test4/init/Kconfig.old 2003-08-24 14:51:15.000000000 +0200 +++ linux-2.6.0-test4/init/Kconfig 2003-08-24 14:55:45.000000000 +0200 @@ -48,6 +48,15 @@ menu "General setup" +config OPTIMIZE_FOR_SIZE + bool "Optimize for size" if EXPERIMENTAL + default n + help + Enabling this option will pass "-Os" instead of "-O2" to gcc + resulting in a smaller kernel. + + If unsure, say N. + config SWAP bool "Support for paging of anonymous memory" depends on MMU --- linux-2.6.0-test3/Makefile.old 2003-08-11 01:34:41.000000000 +0200 +++ linux-2.6.0-test3/Makefile 2003-08-11 01:37:16.000000000 +0200 @@ -223,7 +223,7 @@ NOSTDINC_FLAGS = -nostdinc -iwithprefix include CPPFLAGS := -D__KERNEL__ -Iinclude -CFLAGS := -Wall -Wstrict-prototypes -Wno-trigraphs -O2 \ +CFLAGS := -Wall -Wstrict-prototypes -Wno-trigraphs \ -fno-strict-aliasing -fno-common AFLAGS := -D__ASSEMBLY__ @@ -318,6 +318,12 @@ -include .config.cmd +ifdef CONFIG_OPTIMIZE_FOR_SIZE +CFLAGS += -Os +else +CFLAGS += -O2 +endif + ifndef CONFIG_FRAME_POINTER CFLAGS += -fomit-frame-pointer endif --- linux-2.6.0-test4/arch/arm26/Makefile.old 2003-08-24 14:50:45.000000000 +0200 +++ linux-2.6.0-test4/arch/arm26/Makefile 2003-08-24 14:56:15.000000000 +0200 @@ -13,7 +13,6 @@ OBJCOPYFLAGS :=-O binary -R .note -R .comment -S GZFLAGS :=-9 #CFLAGS +=-pipe -CFLAGS :=$(CFLAGS:-O2=-Os) ifeq ($(CONFIG_FRAME_POINTER),y) CFLAGS +=-fno-omit-frame-pointer -mno-sched-prolog --- linux-2.6.0-test4/arch/arm/Makefile.old 2003-08-24 14:56:41.000000000 +0200 +++ linux-2.6.0-test4/arch/arm/Makefile 2003-08-24 14:56:57.000000000 +0200 @@ -14,8 +14,6 @@ GZFLAGS :=-9 #CFLAGS +=-pipe -CFLAGS :=$(CFLAGS:-O2=-Os) - ifeq ($(CONFIG_FRAME_POINTER),y) CFLAGS +=-fno-omit-frame-pointer -mapcs -mno-sched-prolog endif --- linux-2.6.0-test4/arch/h8300/Makefile.old 2003-08-24 14:59:42.000000000 +0200 +++ linux-2.6.0-test4/arch/h8300/Makefile 2003-08-24 15:00:18.000000000 +0200 @@ -34,7 +34,7 @@ ldflags-$(CONFIG_CPU_H8S) := -mh8300self CFLAGS += $(cflags-y) -CFLAGS += -mint32 -fno-builtin -Os +CFLAGS += -mint32 -fno-builtin CFLAGS += -g CFLAGS += -D__linux__ CFLAGS += -DUTS_SYSNAME=\"uClinux\" - 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/