kbuild: enable 'make CFLAGS=...' to add additional options to CC

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / s390 / Makefile

#
# s390/Makefile
#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies. Remember to do have actions
# for "archclean" and "archdep" for cleaning up and making dependencies for
# this architecture
#
# This file is subject to the terms and conditions of the GNU General Public
# License.  See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1994 by Linus Torvalds
#

ifndef CONFIG_64BIT
LDFLAGS		:= -m elf_s390
KBUILD_CFLAGS	+= -m31
AFLAGS		+= -m31
UTS_MACHINE	:= s390
STACK_SIZE	:= 8192
CHECKFLAGS	+= -D__s390__ -msize-long
else
LDFLAGS		:= -m elf64_s390
MODFLAGS	+= -fpic -D__PIC__
KBUILD_CFLAGS	+= -m64
AFLAGS		+= -m64
UTS_MACHINE	:= s390x
STACK_SIZE	:= 16384
CHECKFLAGS	+= -D__s390__ -D__s390x__
endif

cflags-$(CONFIG_MARCH_G5)   += $(call cc-option,-march=g5)
cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)
cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)
cflags-$(CONFIG_MARCH_Z9_109) += $(call cc-option,-march=z9-109)

#KBUILD_IMAGE is necessary for make rpm
KBUILD_IMAGE	:=arch/s390/boot/image

#
# Prevent tail-call optimizations, to get clearer backtraces:
#
cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls

# old style option for packed stacks
ifeq ($(call cc-option-yn,-mkernel-backchain),y)
cflags-$(CONFIG_PACK_STACK)  += -mkernel-backchain -D__PACK_STACK
aflags-$(CONFIG_PACK_STACK)  += -D__PACK_STACK
cflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
aflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
ifdef CONFIG_SMALL_STACK
STACK_SIZE := $(shell echo $$(($(STACK_SIZE)/2)) )
endif
endif

# new style option for packed stacks
ifeq ($(call cc-option-yn,-mpacked-stack),y)
cflags-$(CONFIG_PACK_STACK)  += -mpacked-stack -D__PACK_STACK
aflags-$(CONFIG_PACK_STACK)  += -D__PACK_STACK
cflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
aflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
ifdef CONFIG_SMALL_STACK
STACK_SIZE := $(shell echo $$(($(STACK_SIZE)/2)) )
endif
endif

ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
ifneq ($(call cc-option-yn,-mstack-size=8192),y)
cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
endif
endif

ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
cflags-$(CONFIG_WARN_STACK) += -mwarn-dynamicstack
cflags-$(CONFIG_WARN_STACK) += -mwarn-framesize=$(CONFIG_WARN_STACK_SIZE)
endif

KBUILD_CFLAGS	+= -mbackchain -msoft-float $(cflags-y)
KBUILD_CFLAGS	+= -pipe -fno-strength-reduce -Wno-sign-compare
AFLAGS		+= $(aflags-y)

OBJCOPYFLAGS	:= -O binary
LDFLAGS_vmlinux := -e start

head-y		:= arch/s390/kernel/head.o arch/s390/kernel/init_task.o

core-y		+= arch/s390/mm/ arch/s390/kernel/ arch/s390/crypto/ \
		   arch/s390/appldata/ arch/s390/hypfs/
libs-y		+= arch/s390/lib/
drivers-y	+= drivers/s390/
drivers-$(CONFIG_MATHEMU) += arch/s390/math-emu/

# must be linked after kernel
drivers-$(CONFIG_OPROFILE)	+= arch/s390/oprofile/

boot		:= arch/s390/boot

all: image

install: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $@

image: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

zfcpdump:
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

archclean:
	$(Q)$(MAKE) $(clean)=$(boot)

# Don't use tabs in echo arguments
define archhelp
  echo  '* image           - Kernel image for IPL ($(boot)/image)'
endef