kbuild: replace KBUILD_SRCTREE with boolean building_out_of_srctree

  KBUILD_EXTMOD := $(M)

endif

export KBUILD_CHECKSRC KBUILD_EXTMOD

ifeq ($(abs_srctree),$(abs_objtree))

        # building in the source tree

        srctree := .

	building_out_of_srctree :=

else

        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))

                # building in a subdirectory of the source tree

        else

                srctree := $(abs_srctree)

        endif

	# TODO:

	# KBUILD_SRC is only used to distinguish in-tree/out-of-tree build.

	# Replace it with $(srctree) or something.

	KBUILD_SRC := $(abs_srctree)

	building_out_of_srctree := 1

endif

export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC

objtree		:= .

VPATH		:= $(srctree)

export srctree objtree VPATH

export building_out_of_srctree srctree objtree VPATH

# To make sure we do not include .config for any of the *config targets

# catch them early, and hand them over to scripts/kconfig/Makefile

LINUXINCLUDE    := \

		-I$(srctree)/arch/$(SRCARCH)/include \

		-I$(objtree)/arch/$(SRCARCH)/include/generated \

		$(if $(filter .,$(srctree)),,-I$(srctree)/include) \

		$(if $(building_out_of_srctree),-I$(srctree)/include) \

		-I$(objtree)/include \

		$(USERINCLUDE)

# At the same time when output Makefile generated, generate .gitignore to

# ignore whole output directory

outputmakefile:

ifneq ($(srctree),.)

ifdef building_out_of_srctree

	$(Q)ln -fsn $(srctree) source

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)

	$(Q)test -e .gitignore || \

# and if so do:

# 1) Check that make has not been executed in the kernel src $(srctree)

prepare3: include/config/kernel.release

ifneq ($(srctree),.)

ifdef building_out_of_srctree

	@$(kecho) '  Using $(srctree) as source for kernel'

	$(Q)if [ -f $(srctree)/.config -o \

		 -d $(srctree)/include/config -o \

-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)

ifneq ($(srctree),.)

ifdef building_out_of_srctree

# Create directories for object files if they do not exist

obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))

# If targets exist, their directories apparently exist. Skip mkdir.

# $(objtree)/$(obj) for including generated headers from checkin source files

ifeq ($(KBUILD_EXTMOD),)

ifneq ($(srctree),.)

ifdef building_out_of_srctree

_hostc_flags   += -I $(objtree)/$(obj)

_hostcxx_flags += -I $(objtree)/$(obj)

endif

# $(srctree)/$(src) for including checkin headers from generated source files

# $(objtree)/$(obj) for including generated headers from checkin source files

ifeq ($(KBUILD_EXTMOD),)

ifneq ($(srctree),.)

ifdef building_out_of_srctree

_c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)

_a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)

_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)

include scripts/Kbuild.include

ifneq ($(srctree),.)

ifdef building_out_of_srctree

# Create output directory if not already present

_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))

endif