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Subject[2.6 patch] add a config option for -Os
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\"
-
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