[mirror_ubuntu-bionic-kernel.git] / scripts / Makefile.lib

# Backward compatibility
asflags-y  += $(EXTRA_AFLAGS)
ccflags-y  += $(EXTRA_CFLAGS)
cppflags-y += $(EXTRA_CPPFLAGS)
ldflags-y  += $(EXTRA_LDFLAGS)

#
# flags that take effect in sub directories
export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)

# Figure out what we need to build from the various variables
# ===========================================================================

# When an object is listed to be built compiled-in and modular,
# only build the compiled-in version

obj-m := $(filter-out $(obj-y),$(obj-m))

# Libraries are always collected in one lib file.
# Filter out objects already built-in

lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))


# Handle objects in subdirs
# ---------------------------------------------------------------------------
# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
#   and add the directory to the list of dirs to descend into: $(subdir-y)
# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
#   and add the directory to the list of dirs to descend into: $(subdir-m)

# Determine modorder.
# Unfortunately, we don't have information about ordering between -y
# and -m subdirs.  Just put -y's first.
modorder	:= $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))

__subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
subdir-y	+= $(__subdir-y)
__subdir-m	:= $(patsubst %/,%,$(filter %/, $(obj-m)))
subdir-m	+= $(__subdir-m)
obj-y		:= $(patsubst %/, %/built-in.o, $(obj-y))
obj-m		:= $(filter-out %/, $(obj-m))

# Subdirectories we need to descend into

subdir-ym	:= $(sort $(subdir-y) $(subdir-m))

# if $(foo-objs) exists, foo.o is a composite object
multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
multi-used   := $(multi-used-y) $(multi-used-m)
single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))

# Build list of the parts of our composite objects, our composite
# objects depend on those (obviously)
multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
multi-objs   := $(multi-objs-y) $(multi-objs-m)

# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
# tell kbuild to descend
subdir-obj-y := $(filter %/built-in.o, $(obj-y))

# $(obj-dirs) is a list of directories that contain object files
obj-dirs := $(dir $(multi-objs) $(obj-y))

# Replace multi-part objects by their individual parts, look at local dir only
real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))

# Add subdir path

extra-y		:= $(addprefix $(obj)/,$(extra-y))
always		:= $(addprefix $(obj)/,$(always))
targets		:= $(addprefix $(obj)/,$(targets))
modorder	:= $(addprefix $(obj)/,$(modorder))
obj-y		:= $(addprefix $(obj)/,$(obj-y))
obj-m		:= $(addprefix $(obj)/,$(obj-m))
lib-y		:= $(addprefix $(obj)/,$(lib-y))
subdir-obj-y	:= $(addprefix $(obj)/,$(subdir-obj-y))
real-objs-y	:= $(addprefix $(obj)/,$(real-objs-y))
real-objs-m	:= $(addprefix $(obj)/,$(real-objs-m))
single-used-m	:= $(addprefix $(obj)/,$(single-used-m))
multi-used-y	:= $(addprefix $(obj)/,$(multi-used-y))
multi-used-m	:= $(addprefix $(obj)/,$(multi-used-m))
multi-objs-y	:= $(addprefix $(obj)/,$(multi-objs-y))
multi-objs-m	:= $(addprefix $(obj)/,$(multi-objs-m))
subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
obj-dirs	:= $(addprefix $(obj)/,$(obj-dirs))

# These flags are needed for modversions and compiling, so we define them here
# already
# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
# end up in (or would, if it gets compiled in)
# Note: Files that end up in two or more modules are compiled without the
#       KBUILD_MODNAME definition. The reason is that any made-up name would
#       differ in different configs.
name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
modname_flags  = $(if $(filter 1,$(words $(modname))),\
                 -DKBUILD_MODNAME=$(call name-fix,$(modname)))

orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
                 $(ccflags-y) $(CFLAGS_$(basetarget).o)
_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
                 $(asflags-y) $(AFLAGS_$(basetarget).o)
_a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))

#
# Enable gcov profiling flags for a file, directory or for all files depending
# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
# (in this order)
#
ifeq ($(CONFIG_GCOV_KERNEL),y)
_c_flags += $(if $(patsubst n%,, \
		$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
		$(CFLAGS_GCOV))
endif

#
# Enable address sanitizer flags for kernel except some files or directories
# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
#
ifeq ($(CONFIG_KASAN),y)
_c_flags += $(if $(patsubst n%,, \
		$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
		$(CFLAGS_KASAN))
endif

ifeq ($(CONFIG_UBSAN),y)
_c_flags += $(if $(patsubst n%,, \
		$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
		$(CFLAGS_UBSAN))
endif

ifeq ($(CONFIG_KCOV),y)
_c_flags += $(if $(patsubst n%,, \
	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
	$(CFLAGS_KCOV))
endif

# If building the kernel in a separate objtree expand all occurrences
# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').

ifeq ($(KBUILD_SRC),)
__c_flags	= $(_c_flags)
__a_flags	= $(_a_flags)
__cpp_flags     = $(_cpp_flags)
else

# -I$(obj) locates generated .h files
# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
#   and locates generated .h files
# FIXME: Replace both with specific CFLAGS* statements in the makefiles
__c_flags	= $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
		  $(call flags,_c_flags)
__a_flags	= $(call flags,_a_flags)
__cpp_flags     = $(call flags,_cpp_flags)
endif

c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
		 $(__c_flags) $(modkern_cflags)                           \
		 $(basename_flags) $(modname_flags)

a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
		 $(__a_flags) $(modkern_aflags)

cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
		 $(__cpp_flags)

ld_flags       = $(LDFLAGS) $(ldflags-y)

dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
		 -I$(srctree)/scripts/dtc/include-prefixes               \
		 -undef -D__DTS__

# Finds the multi-part object the current object will be linked into
modname-multi = $(sort $(foreach m,$(multi-used),\
		$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))

# Useful for describing the dependency of composite objects
# Usage:
#   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
define multi_depend
$(foreach m, $(notdir $1), \
	$(eval $(obj)/$m: \
	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
endef

ifdef REGENERATE_PARSERS

# GPERF
# ---------------------------------------------------------------------------
quiet_cmd_gperf = GPERF $@
      cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<

.PRECIOUS: $(src)/%.hash.c_shipped
$(src)/%.hash.c_shipped: $(src)/%.gperf
	$(call cmd,gperf)

# LEX
# ---------------------------------------------------------------------------
LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)

quiet_cmd_flex = LEX     $@
      cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<

.PRECIOUS: $(src)/%.lex.c_shipped
$(src)/%.lex.c_shipped: $(src)/%.l
	$(call cmd,flex)

# YACC
# ---------------------------------------------------------------------------
YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)

quiet_cmd_bison = YACC    $@
      cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<

.PRECIOUS: $(src)/%.tab.c_shipped
$(src)/%.tab.c_shipped: $(src)/%.y
	$(call cmd,bison)

quiet_cmd_bison_h = YACC    $@
      cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<

.PRECIOUS: $(src)/%.tab.h_shipped
$(src)/%.tab.h_shipped: $(src)/%.y
	$(call cmd,bison_h)

endif

# Shipped files
# ===========================================================================

quiet_cmd_shipped = SHIPPED $@
cmd_shipped = cat $< > $@

$(obj)/%: $(src)/%_shipped
	$(call cmd,shipped)

# Commands useful for building a boot image
# ===========================================================================
#
#	Use as following:
#
#	target: source(s) FORCE
#		$(if_changed,ld/objcopy/gzip)
#
#	and add target to extra-y so that we know we have to
#	read in the saved command line

# Linking
# ---------------------------------------------------------------------------

quiet_cmd_ld = LD      $@
cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
	       $(filter-out FORCE,$^) -o $@

# Objcopy
# ---------------------------------------------------------------------------

quiet_cmd_objcopy = OBJCOPY $@
cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

# Gzip
# ---------------------------------------------------------------------------

quiet_cmd_gzip = GZIP    $@
cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
	(rm -f $@ ; false)

# DTC
# ---------------------------------------------------------------------------
DTC ?= $(objtree)/scripts/dtc/dtc

# Disable noisy checks by default
ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
DTC_FLAGS += -Wno-unit_address_vs_reg \
	-Wno-simple_bus_reg \
	-Wno-unit_address_format \
	-Wno-pci_bridge \
	-Wno-pci_device_bus_num \
	-Wno-pci_device_reg
endif

ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
DTC_FLAGS += -Wnode_name_chars_strict \
	-Wproperty_name_chars_strict
endif

DTC_FLAGS += $(DTC_FLAGS_$(basetarget))

# Generate an assembly file to wrap the output of the device tree compiler
quiet_cmd_dt_S_dtb= DTB     $@
cmd_dt_S_dtb=						\
(							\
	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
	echo '.section .dtb.init.rodata,"a"';		\
	echo '.balign STRUCT_ALIGNMENT';		\
	echo '.global __dtb_$(*F)_begin';		\
	echo '__dtb_$(*F)_begin:';			\
	echo '.incbin "$<" ';				\
	echo '__dtb_$(*F)_end:';			\
	echo '.global __dtb_$(*F)_end';			\
	echo '.balign STRUCT_ALIGNMENT'; 		\
) > $@

$(obj)/%.dtb.S: $(obj)/%.dtb
	$(call cmd,dt_S_dtb)

quiet_cmd_dtc = DTC     $@
cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
	$(DTC) -O dtb -o $@ -b 0 \
		-i $(dir $<) $(DTC_FLAGS) \
		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)

$(obj)/%.dtb: $(src)/%.dts FORCE
	$(call if_changed_dep,dtc)

dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)

# Bzip2
# ---------------------------------------------------------------------------

# Bzip2 and LZMA do not include size in file... so we have to fake that;
# append the size as a 32-bit littleendian number as gzip does.
size_append = printf $(shell						\
dec_size=0;								\
for F in $1; do								\
	fsize=$$(stat -c "%s" $$F);					\
	dec_size=$$(expr $$dec_size + $$fsize);				\
done;									\
printf "%08x\n" $$dec_size |						\
	sed 's/\(..\)/\1 /g' | {					\
		read ch0 ch1 ch2 ch3;					\
		for ch in $$ch3 $$ch2 $$ch1 $$ch0; do			\
			printf '%s%03o' '\\' $$((0x$$ch)); 		\
		done;							\
	}								\
)

quiet_cmd_bzip2 = BZIP2   $@
cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

# Lzma
# ---------------------------------------------------------------------------

quiet_cmd_lzma = LZMA    $@
cmd_lzma = (cat $(filter-out FORCE,$^) | \
	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

quiet_cmd_lzo = LZO     $@
cmd_lzo = (cat $(filter-out FORCE,$^) | \
	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

quiet_cmd_lz4 = LZ4     $@
cmd_lz4 = (cat $(filter-out FORCE,$^) | \
	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

# U-Boot mkimage
# ---------------------------------------------------------------------------

MKIMAGE := $(srctree)/scripts/mkuboot.sh

# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
# the number of overrides in arch makefiles
UIMAGE_ARCH ?= $(SRCARCH)
UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
UIMAGE_OPTS-y ?=
UIMAGE_TYPE ?= kernel
UIMAGE_LOADADDR ?= arch_must_set_this
UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
UIMAGE_IN ?= $<
UIMAGE_OUT ?= $@

quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
      cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
			-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
			-T $(UIMAGE_TYPE) \
			-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
			-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)

# XZ
# ---------------------------------------------------------------------------
# Use xzkern to compress the kernel image and xzmisc to compress other things.
#
# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
# of the kernel decompressor. A BCJ filter is used if it is available for
# the target architecture. xzkern also appends uncompressed size of the data
# using size_append. The .xz format has the size information available at
# the end of the file too, but it's in more complex format and it's good to
# avoid changing the part of the boot code that reads the uncompressed size.
# Note that the bytes added by size_append will make the xz tool think that
# the file is corrupt. This is expected.
#
# xzmisc doesn't use size_append, so it can be used to create normal .xz
# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
# big dictionary would increase the memory usage too much in the multi-call
# decompression mode. A BCJ filter isn't used either.
quiet_cmd_xzkern = XZKERN  $@
cmd_xzkern = (cat $(filter-out FORCE,$^) | \
	sh $(srctree)/scripts/xz_wrap.sh && \
	$(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

quiet_cmd_xzmisc = XZMISC  $@
cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
	xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
	(rm -f $@ ; false)

# ASM offsets
# ---------------------------------------------------------------------------

# Default sed regexp - multiline due to syntax constraints
#
# Use [:space:] because LLVM's integrated assembler inserts <tab> around
# the .ascii directive whereas GCC keeps the <space> as-is.
define sed-offsets
	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
	/^->/{s:->#\(.*\):/* \1 */:; \
	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:->::; p;}'
endef

# Use filechk to avoid rebuilds when a header changes, but the resulting file
# does not
define filechk_offsets
	(set -e; \
	 echo "#ifndef $2"; \
	 echo "#define $2"; \
	 echo "/*"; \
	 echo " * DO NOT MODIFY."; \
	 echo " *"; \
	 echo " * This file was generated by Kbuild"; \
	 echo " */"; \
	 echo ""; \
	 sed -ne $(sed-offsets); \
	 echo ""; \
	 echo "#endif" )
endef
Commit	Line	Data
f77bf014 SR	1	# Backward compatibility
	2	asflags-y += $(EXTRA_AFLAGS)
	3	ccflags-y += $(EXTRA_CFLAGS)
	4	cppflags-y += $(EXTRA_CPPFLAGS)
	5	ldflags-y += $(EXTRA_LDFLAGS)
	6
720097d8 SR	7	#
	8	# flags that take effect in sub directories
	9	export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
	10	export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
	11
1da177e4 LT	12	# Figure out what we need to build from the various variables
	13	# ===========================================================================
	14
	15	# When an object is listed to be built compiled-in and modular,
	16	# only build the compiled-in version
	17
	18	obj-m := $(filter-out $(obj-y),$(obj-m))
	19
	20	# Libraries are always collected in one lib file.
	21	# Filter out objects already built-in
	22
	23	lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
	24
	25
	26	# Handle objects in subdirs
	27	# ---------------------------------------------------------------------------
	28	# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
	29	# and add the directory to the list of dirs to descend into: $(subdir-y)
38385f8f	30	# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
1da177e4 LT	31	# and add the directory to the list of dirs to descend into: $(subdir-m)
1da177e4 LT	32
551559e1 TH	33	# Determine modorder.
	34	# Unfortunately, we don't have information about ordering between -y
	35	# and -m subdirs. Just put -y's first.
	36	modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
	37
1da177e4 LT	38	__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
	39	subdir-y += $(__subdir-y)
	40	__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
	41	subdir-m += $(__subdir-m)
	42	obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
	43	obj-m := $(filter-out %/, $(obj-m))
	44
	45	# Subdirectories we need to descend into
	46
	47	subdir-ym := $(sort $(subdir-y) $(subdir-m))
	48
38385f8f	49	# if $(foo-objs) exists, foo.o is a composite object
1da177e4	50	multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
cf4f2193	51	multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
1da177e4 LT	52	multi-used := $(multi-used-y) $(multi-used-m)
	53	single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
	54
	55	# Build list of the parts of our composite objects, our composite
	56	# objects depend on those (obviously)
	57	multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
	58	multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
	59	multi-objs := $(multi-objs-y) $(multi-objs-m)
	60
f5fb9765 SR	61	# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
	62	# tell kbuild to descend
	63	subdir-obj-y := $(filter %/built-in.o, $(obj-y))
1da177e4 LT	64
1da177e4 LT	65	# $(obj-dirs) is a list of directories that contain object files
4d47dde4	66	obj-dirs := $(dir $(multi-objs) $(obj-y))
1da177e4 LT	67
	68	# Replace multi-part objects by their individual parts, look at local dir only
	69	real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
cf4f2193	70	real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
1da177e4 LT	71
	72	# Add subdir path
	73
	74	extra-y := $(addprefix $(obj)/,$(extra-y))
	75	always := $(addprefix $(obj)/,$(always))
	76	targets := $(addprefix $(obj)/,$(targets))
551559e1	77	modorder := $(addprefix $(obj)/,$(modorder))
1da177e4 LT	78	obj-y := $(addprefix $(obj)/,$(obj-y))
	79	obj-m := $(addprefix $(obj)/,$(obj-m))
	80	lib-y := $(addprefix $(obj)/,$(lib-y))
	81	subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
	82	real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
	83	real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
	84	single-used-m := $(addprefix $(obj)/,$(single-used-m))
	85	multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
	86	multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
	87	multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
	88	multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
	89	subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
	90	obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
	91
1da177e4 LT	92	# These flags are needed for modversions and compiling, so we define them here
1da177e4 LT	93	# already
38385f8f	94	# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
1da177e4	95	# end up in (or would, if it gets compiled in)
5bb0571b MM	96	# Note: Files that end up in two or more modules are compiled without the
	97	# KBUILD_MODNAME definition. The reason is that any made-up name would
	98	# differ in different configs.
b42841b7 MM	99	name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
b42841b7 MM	100	basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
f83b5e32	101	modname_flags = $(if $(filter 1,$(words $(modname))),\
b42841b7	102	-DKBUILD_MODNAME=$(call name-fix,$(modname)))
1da177e4	103
720097d8	104	orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
d8672b40	105	$(ccflags-y) $(CFLAGS_$(basetarget).o)
656ee82c	106	_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
a7e137eb	107	orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
d8672b40	108	$(asflags-y) $(AFLAGS_$(basetarget).o)
a7e137eb	109	_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
f77bf014	110	_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
1da177e4	111
2521f2c2 PO	112	#
	113	# Enable gcov profiling flags for a file, directory or for all files depending
	114	# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
	115	# (in this order)
	116	#
	117	ifeq ($(CONFIG_GCOV_KERNEL),y)
	118	_c_flags += $(if $(patsubst n%,, \
	119	$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
	120	$(CFLAGS_GCOV))
	121	endif
	122
0b24becc AR	123	#
	124	# Enable address sanitizer flags for kernel except some files or directories
	125	# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
	126	#
	127	ifeq ($(CONFIG_KASAN),y)
	128	_c_flags += $(if $(patsubst n%,, \
	129	$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
	130	$(CFLAGS_KASAN))
	131	endif
	132
c6d30853 AR	133	ifeq ($(CONFIG_UBSAN),y)
	134	_c_flags += $(if $(patsubst n%,, \
	135	$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
	136	$(CFLAGS_UBSAN))
	137	endif
	138
5c9a8750 DV	139	ifeq ($(CONFIG_KCOV),y)
5c9a8750 DV	140	_c_flags += $(if $(patsubst n%,, \
a4691dea	141	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
5c9a8750 DV	142	$(CFLAGS_KCOV))
	143	endif
	144
1da177e4 LT	145	# If building the kernel in a separate objtree expand all occurrences
	146	# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
	147
	148	ifeq ($(KBUILD_SRC),)
	149	__c_flags = $(_c_flags)
	150	__a_flags = $(_a_flags)
	151	__cpp_flags = $(_cpp_flags)
	152	else
	153
1da177e4 LT	154	# -I$(obj) locates generated .h files
	155	# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
	156	# and locates generated .h files
	157	# FIXME: Replace both with specific CFLAGS* statements in the makefiles
4607ebf0	158	__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
db547ef1 AB	159	$(call flags,_c_flags)
	160	__a_flags = $(call flags,_a_flags)
	161	__cpp_flags = $(call flags,_cpp_flags)
1da177e4 LT	162	endif
1da177e4 LT	163
d8672b40 SR	164	c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
d8672b40 SR	165	$(__c_flags) $(modkern_cflags) \
b42841b7	166	$(basename_flags) $(modname_flags)
1da177e4	167
d8672b40	168	a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
1da177e4 LT	169	$(__a_flags) $(modkern_aflags)
1da177e4 LT	170
d8672b40 SR	171	cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
d8672b40 SR	172	$(__cpp_flags)
1da177e4	173
f77bf014	174	ld_flags = $(LDFLAGS) $(ldflags-y)
1da177e4	175
b0a4d8b3	176	dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
d5d332d3	177	-I$(srctree)/scripts/dtc/include-prefixes \
e570d7c1 SW	178	-undef -D__DTS__
e570d7c1 SW	179
1da177e4 LT	180	# Finds the multi-part object the current object will be linked into
	181	modname-multi = $(sort $(foreach m,$(multi-used),\
	182	$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
	183
c8589d1e MY	184	# Useful for describing the dependency of composite objects
	185	# Usage:
	186	# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
	187	define multi_depend
	188	$(foreach m, $(notdir $1), \
	189	$(eval $(obj)/$m: \
	190	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
	191	endef
	192
7373f4f8 AL	193	ifdef REGENERATE_PARSERS
	194
	195	# GPERF
	196	# ---------------------------------------------------------------------------
	197	quiet_cmd_gperf = GPERF $@
	198	cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
	199
58238c81	200	.PRECIOUS: $(src)/%.hash.c_shipped
7373f4f8 AL	201	$(src)/%.hash.c_shipped: $(src)/%.gperf
	202	$(call cmd,gperf)
	203
	204	# LEX
	205	# ---------------------------------------------------------------------------
	206	LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
	207
	208	quiet_cmd_flex = LEX $@
	209	cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
	210
58238c81	211	.PRECIOUS: $(src)/%.lex.c_shipped
7373f4f8 AL	212	$(src)/%.lex.c_shipped: $(src)/%.l
	213	$(call cmd,flex)
	214
	215	# YACC
	216	# ---------------------------------------------------------------------------
	217	YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
	218
	219	quiet_cmd_bison = YACC $@
	220	cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
	221
58238c81	222	.PRECIOUS: $(src)/%.tab.c_shipped
7373f4f8 AL	223	$(src)/%.tab.c_shipped: $(src)/%.y
	224	$(call cmd,bison)
	225
	226	quiet_cmd_bison_h = YACC $@
	227	cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
	228
58238c81	229	.PRECIOUS: $(src)/%.tab.h_shipped
7373f4f8 AL	230	$(src)/%.tab.h_shipped: $(src)/%.y
	231	$(call cmd,bison_h)
	232
	233	endif
	234
1da177e4 LT	235	# Shipped files
	236	# ===========================================================================
	237
	238	quiet_cmd_shipped = SHIPPED $@
	239	cmd_shipped = cat $< > $@
	240
991d76c9	241	$(obj)/%: $(src)/%_shipped
1da177e4 LT	242	$(call cmd,shipped)
	243
	244	# Commands useful for building a boot image
	245	# ===========================================================================
38385f8f	246	#
1da177e4 LT	247	# Use as following:
	248	#
	249	# target: source(s) FORCE
	250	# $(if_changed,ld/objcopy/gzip)
	251	#
836caba7	252	# and add target to extra-y so that we know we have to
1da177e4 LT	253	# read in the saved command line
	254
	255	# Linking
	256	# ---------------------------------------------------------------------------
	257
	258	quiet_cmd_ld = LD $@
f77bf014	259	cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
38385f8f	260	$(filter-out FORCE,$^) -o $@
1da177e4 LT	261
	262	# Objcopy
	263	# ---------------------------------------------------------------------------
	264
	265	quiet_cmd_objcopy = OBJCOPY $@
	266	cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
	267
	268	# Gzip
	269	# ---------------------------------------------------------------------------
	270
	271	quiet_cmd_gzip = GZIP $@
6ae9ecb8	272	cmd_gzip = (cat $(filter-out FORCE,$^) \| gzip -n -f -9 > $@) \|\| \
d3dd3b5a	273	(rm -f $@ ; false)
1da177e4	274
aab94339 DB	275	# DTC
aab94339 DB	276	# ---------------------------------------------------------------------------
6b22b3d1	277	DTC ?= $(objtree)/scripts/dtc/dtc
aab94339	278
bc553986 RH	279	# Disable noisy checks by default
bc553986 RH	280	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
8654cb8d RH	281	DTC_FLAGS += -Wno-unit_address_vs_reg \
	282	-Wno-simple_bus_reg \
	283	-Wno-unit_address_format \
	284	-Wno-pci_bridge \
	285	-Wno-pci_device_bus_num \
	286	-Wno-pci_device_reg
bc553986 RH	287	endif
bc553986 RH	288
8654cb8d RH	289	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
	290	DTC_FLAGS += -Wnode_name_chars_strict \
	291	-Wproperty_name_chars_strict
bc553986 RH	292	endif
bc553986 RH	293
331f7416 FR	294	DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
331f7416 FR	295
aab94339	296	# Generate an assembly file to wrap the output of the device tree compiler
1c00a47e	297	quiet_cmd_dt_S_dtb= DTB $@
aab94339 DB	298	cmd_dt_S_dtb= \
	299	( \
	300	echo '\#include <asm-generic/vmlinux.lds.h>'; \
	301	echo '.section .dtb.init.rodata,"a"'; \
	302	echo '.balign STRUCT_ALIGNMENT'; \
	303	echo '.global __dtb_$(*F)_begin'; \
	304	echo '__dtb_$(*F)_begin:'; \
	305	echo '.incbin "$<" '; \
	306	echo '__dtb_$(*F)_end:'; \
	307	echo '.global __dtb_$(*F)_end'; \
	308	echo '.balign STRUCT_ALIGNMENT'; \
	309	) > $@
	310
	311	$(obj)/%.dtb.S: $(obj)/%.dtb
	312	$(call cmd,dt_S_dtb)
	313
	314	quiet_cmd_dtc = DTC $@
77479b38 NR	315	cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
77479b38 NR	316	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
6b22b3d1	317	$(DTC) -O dtb -o $@ -b 0 \
ad061568	318	-i $(dir $<) $(DTC_FLAGS) \
b0a4d8b3 IC	319	-d $(depfile).dtc.tmp $(dtc-tmp) ; \
b0a4d8b3 IC	320	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
1da177e4	321
90b335fb SW	322	$(obj)/%.dtb: $(src)/%.dts FORCE
	323	$(call if_changed_dep,dtc)
	324
b0a4d8b3	325	dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
22435f38	326
bc22c17e AK	327	# Bzip2
	328	# ---------------------------------------------------------------------------
	329
d3dd3b5a PA	330	# Bzip2 and LZMA do not include size in file... so we have to fake that;
d3dd3b5a PA	331	# append the size as a 32-bit littleendian number as gzip does.
4a2ff67c	332	size_append = printf $(shell \
d3dd3b5a PA	333	dec_size=0; \
	334	for F in $1; do \
	335	fsize=$$(stat -c "%s" $$F); \
	336	dec_size=$$(expr $$dec_size + $$fsize); \
	337	done; \
1373411a JN	338	printf "%08x\n" $$dec_size \| \
	339	sed 's/\(..\)/\1 /g' \| { \
	340	read ch0 ch1 ch2 ch3; \
	341	for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
	342	printf '%s%03o' '\\' $$((0x$$ch)); \
	343	done; \
	344	} \
d3dd3b5a PA	345	)
	346
	347	quiet_cmd_bzip2 = BZIP2 $@
	348	cmd_bzip2 = (cat $(filter-out FORCE,$^) \| \
	349	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	350	(rm -f $@ ; false)
bc22c17e AK	351
	352	# Lzma
	353	# ---------------------------------------------------------------------------
	354
	355	quiet_cmd_lzma = LZMA $@
d3dd3b5a PA	356	cmd_lzma = (cat $(filter-out FORCE,$^) \| \
	357	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	358	(rm -f $@ ; false)
7dd65feb	359
2d74b2c6	360	quiet_cmd_lzo = LZO $@
7dd65feb AT	361	cmd_lzo = (cat $(filter-out FORCE,$^) \| \
	362	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	363	(rm -f $@ ; false)
d61931d8	364
e76e1fdf KL	365	quiet_cmd_lz4 = LZ4 $@
	366	cmd_lz4 = (cat $(filter-out FORCE,$^) \| \
	367	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	368	(rm -f $@ ; false)
	369
e3393645 SW	370	# U-Boot mkimage
	371	# ---------------------------------------------------------------------------
	372
	373	MKIMAGE := $(srctree)/scripts/mkuboot.sh
	374
	375	# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
	376	# the number of overrides in arch makefiles
	377	UIMAGE_ARCH ?= $(SRCARCH)
	378	UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
	379	UIMAGE_OPTS-y ?=
	380	UIMAGE_TYPE ?= kernel
	381	UIMAGE_LOADADDR ?= arch_must_set_this
	382	UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
	383	UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
	384	UIMAGE_IN ?= $<
	385	UIMAGE_OUT ?= $@
	386
	387	quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
	388	cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
	389	-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
	390	-T $(UIMAGE_TYPE) \
	391	-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
	392	-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
	393
24fa0402 LC	394	# XZ
	395	# ---------------------------------------------------------------------------
	396	# Use xzkern to compress the kernel image and xzmisc to compress other things.
	397	#
	398	# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
	399	# of the kernel decompressor. A BCJ filter is used if it is available for
	400	# the target architecture. xzkern also appends uncompressed size of the data
	401	# using size_append. The .xz format has the size information available at
	402	# the end of the file too, but it's in more complex format and it's good to
	403	# avoid changing the part of the boot code that reads the uncompressed size.
	404	# Note that the bytes added by size_append will make the xz tool think that
	405	# the file is corrupt. This is expected.
	406	#
	407	# xzmisc doesn't use size_append, so it can be used to create normal .xz
	408	# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
	409	# big dictionary would increase the memory usage too much in the multi-call
	410	# decompression mode. A BCJ filter isn't used either.
	411	quiet_cmd_xzkern = XZKERN $@
	412	cmd_xzkern = (cat $(filter-out FORCE,$^) \| \
	413	sh $(srctree)/scripts/xz_wrap.sh && \
	414	$(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	415	(rm -f $@ ; false)
	416
	417	quiet_cmd_xzmisc = XZMISC $@
	418	cmd_xzmisc = (cat $(filter-out FORCE,$^) \| \
	419	xz --check=crc32 --lzma2=dict=1MiB) > $@ \|\| \
	420	(rm -f $@ ; false)
ebf003f0 MK	421
	422	# ASM offsets
	423	# ---------------------------------------------------------------------------
	424
	425	# Default sed regexp - multiline due to syntax constraints
cf0c3e68 JH	426	#
	427	# Use [:space:] because LLVM's integrated assembler inserts <tab> around
	428	# the .ascii directive whereas GCC keeps the <space> as-is.
ebf003f0	429	define sed-offsets
cf0c3e68 JH	430	's:^[[:space:]]\.ascii[[:space:]]"\(.\)".:\1:; \
cf0c3e68 JH	431	/^->/{s:->#\(.\):/ \1 */:; \
ebf003f0	432	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
cf0c3e68	433	s:->::; p;}'
ebf003f0 MK	434	endef
	435
	436	# Use filechk to avoid rebuilds when a header changes, but the resulting file
	437	# does not
	438	define filechk_offsets
	439	(set -e; \
	440	echo "#ifndef $2"; \
	441	echo "#define $2"; \
	442	echo "/*"; \
	443	echo " * DO NOT MODIFY."; \
	444	echo " *"; \
	445	echo " * This file was generated by Kbuild"; \
	446	echo " */"; \
	447	echo ""; \
	448	sed -ne $(sed-offsets); \
	449	echo ""; \
	450	echo "#endif" )
	451	endef