[2.6 patch] add an -Os config option

[Adrian Bunk <bunk@fs.tum.de>]

The patch below adds an option OPTIMIZE_FOR_SIZE (depending on EMBEDDED) 
that changes the optimization from -O2 to -Os.

cu
Adrian

--- linux-2.6.0-test3/init/Kconfig.old	2003-08-11 01:33:31.000000000 +0200
+++ linux-2.6.0-test3/init/Kconfig	2003-08-11 01:46:48.000000000 +0200
@@ -118,6 +118,17 @@
 	  a "non-standard" kernel.  Only use this if you really know what you
 	  are doing.
 
+config OPTIMIZE_FOR_SIZE
+	bool "Optimize for size" if EMBEDDED
+	default n
+	help
+	  Enabling this option will pass "-Os" instead of "-O2" to gcc
+	  resulting in a smaller kernel.
+
+	  The resulting kernel might be significantly slower.
+
+	  If unsure, say N.
+
 config KALLSYMS
 	 bool "Load all symbols for debugging/kksymoops" if EMBEDDED
 	 default y
--- 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