Messages in this thread Patch in this message | | | Date | Mon, 11 Aug 2003 23:11:45 +0200 | From | Adrian Bunk <> | Subject | [2.6 patch] add an -Os config option |
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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 - 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/
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