Commit 4ba7e5cd authored by Sam Ravnborg's avatar Sam Ravnborg Committed by Ingo Molnar
Browse files

x86: biarch support for 32 bit builds beautified 



There were no reason to mess around with CC, AS and LD.
Fixing this up avoided duplicated option for ld.

A small fixlet were needed in boot/Makefile which assumed
that CC were modified.

Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 25dfeeb7

arch/x86/Makefile

+4 −7
Original line number Diff line number Diff line
@@ -15,18 +15,15 @@ export BITS 
ifeq ($(CONFIG_X86_32),y)

        BITS := 32

        UTS_MACHINE := i386

        CHECKFLAGS += -D__i386__



        HAS_BIARCH := $(call cc-option-yn, -m32)

        ifeq ($(HAS_BIARCH),y)

                AS := $(AS) --32

                LD := $(LD) -m elf_i386

                CC := $(CC) -m32

        endif

        biarch := $(call cc-option,-m32)

        KBUILD_AFLAGS += $(biarch)

        KBUILD_CFLAGS += $(biarch)



        ifdef CONFIG_RELOCATABLE

                LDFLAGS_vmlinux := --emit-relocs

        endif

        CHECKFLAGS += -D__i386__



        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return

arch/x86/boot/Makefile

+1 −3
Original line number Diff line number Diff line
@@ -49,10 +49,7 @@ HOSTCFLAGS_build.o := $(LINUXINCLUDE) 


# How to compile the 16-bit code.  Note we always compile for -march=i386,

# that way we can complain to the user if the CPU is insufficient.

cflags-$(CONFIG_X86_32) :=

cflags-$(CONFIG_X86_64) := -m32

KBUILD_CFLAGS	:= $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \

		   $(cflags-y) \

		   -Wall -Wstrict-prototypes \

		   -march=i386 -mregparm=3 \

		   -include $(srctree)/$(src)/code16gcc.h \
@@ -62,6 +59,7 @@ KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ 
			$(call cc-option, -fno-unit-at-a-time)) \

		   $(call cc-option, -fno-stack-protector) \

		   $(call cc-option, -mpreferred-stack-boundary=2)

KBUILD_CFLAGS +=   $(call cc-option,-m32)

KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__



$(obj)/zImage:  IMAGE_OFFSET := 0x1000

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