Commit 25dfeeb7 authored by Sam Ravnborg's avatar Sam Ravnborg Committed by Ingo Molnar
Browse files

x86: share more options between 32 and 64 bit build 



On recommendation from Andi Kleen share a few more options
between 32 and 64 bit builds.
A defconfig build for i386 did not show any difference in
size of text and data.

The additional shared options are:
-Wno-sign-compare
-fno-asynchronous-unwind-tables
-mno-sse
-mno-mmx
-mno-sse2
-mno-3dnow

Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 0a6ef376

arch/x86/Makefile

+8 −4
Original line number Diff line number Diff line
@@ -64,14 +64,10 @@ else 
        KBUILD_CFLAGS += -mno-red-zone

        KBUILD_CFLAGS += -mcmodel=kernel



        KBUILD_CFLAGS += -Wno-sign-compare

        KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

        # -funit-at-a-time shrinks the kernel .text considerably

        # unfortunately it makes reading oopses harder.

        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)



        # prevent gcc from generating any FP code by mistake

        KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)

        # this works around some issues with generating unwind tables in older gccs

        # newer gccs do it by default

        KBUILD_CFLAGS += -maccumulate-outgoing-args
@@ -98,7 +94,15 @@ KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) 


LDFLAGS := -m elf_$(UTS_MACHINE)

OBJCOPYFLAGS := -O binary -R .note -R .comment -S



# Speed up the build

KBUILD_CFLAGS += -pipe

# Workaround for a gcc prelease that unfortunately was shipped in a suse release

KBUILD_CFLAGS += -Wno-sign-compare

#

KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

# prevent gcc from generating any FP code by mistake

KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)



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