4f81c5350b
There are various constraints on the use of unit-at-a-time: - i386 uses no-unit-at-a-time for pre-4.0 (not 4.3) - x86_64 uses unit-at-a-time always Uli reported a crash on x86_64 with gcc 4.1.2 with unit-at-a-time, resulting in commitc0a18111e5Ingo reported a gcc internal error with gcc 4.3 with no-unit-at-a-timem, resulting in22eecde2f9Benny Halevy is seeing extern inlines not resolved with gcc 4.3 with no-unit-at-a-time This patch reintroduces unit-at-a-time for gcc >= 4.0, bringing back the possibility of Uli's crash. If that happens, we'll debug it. I started seeing both the internal compiler errors and unresolved inlines on Fedora 9. This patch fixes both problems, without so far reintroducing the crash reported by Uli. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Benny Halevy <bhalevy@panasas.com> Cc: Adrian Bunk <bunk@kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
42 lines
1.4 KiB
Text
42 lines
1.4 KiB
Text
core-y += arch/um/sys-i386/ arch/x86/crypto/
|
|
|
|
TOP_ADDR := $(CONFIG_TOP_ADDR)
|
|
|
|
START := 0x8048000
|
|
|
|
LDFLAGS += -m elf_i386
|
|
ELF_ARCH := $(SUBARCH)
|
|
ELF_FORMAT := elf32-$(SUBARCH)
|
|
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
|
|
HEADER_ARCH := x86
|
|
CHECKFLAGS += -D__i386__
|
|
|
|
ifeq ("$(origin SUBARCH)", "command line")
|
|
ifneq ("$(shell uname -m | sed -e s/i.86/i386/)", "$(SUBARCH)")
|
|
KBUILD_CFLAGS += $(call cc-option,-m32)
|
|
KBUILD_AFLAGS += $(call cc-option,-m32)
|
|
LINK-y += $(call cc-option,-m32)
|
|
UML_OBJCOPYFLAGS += -F $(ELF_FORMAT)
|
|
|
|
export LDFLAGS HOSTCFLAGS HOSTLDFLAGS UML_OBJCOPYFLAGS
|
|
endif
|
|
endif
|
|
|
|
# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.
|
|
include $(srctree)/arch/x86/Makefile_32.cpu
|
|
|
|
# prevent gcc from keeping the stack 16 byte aligned. Taken from i386.
|
|
cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
|
|
|
|
# Prevent sprintf in nfsd from being converted to strcpy and resulting in
|
|
# an unresolved reference.
|
|
cflags-y += -ffreestanding
|
|
|
|
# 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. Also, gcc
|
|
# 4.3.0 needs -funit-at-a-time for extern inline functions.
|
|
KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
|
|
echo $(call cc-option,-fno-unit-at-a-time); \
|
|
else echo $(call cc-option,-funit-at-a-time); fi ;)
|
|
|
|
KBUILD_CFLAGS += $(cflags-y)
|