Messages in this thread Patch in this message | | | Date | Wed, 28 Dec 2005 12:47:01 +0100 | From | Ingo Molnar <> | Subject | [patch 02/2] allow gcc4 to optimize unit-at-a-time |
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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 <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@infradead.org> ----
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/
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