[linux.git] / scripts / Makefile.lib

# SPDX-License-Identifier: GPL-2.0
# Backward compatibility
asflags-y  += $(EXTRA_AFLAGS)
ccflags-y  += $(EXTRA_CFLAGS)
cppflags-y += $(EXTRA_CPPFLAGS)
ldflags-y  += $(EXTRA_LDFLAGS)

# flags that take effect in current and sub directories
KBUILD_AFLAGS += $(subdir-asflags-y)
KBUILD_CFLAGS += $(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)))

# 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))

# Handle objects in subdirs
# ---------------------------------------------------------------------------
# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
#   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)
__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.a, $(obj-y))
obj-m		:= $(filter-out %/, $(obj-m))

# Subdirectories we need to descend into
subdir-ym	:= $(sort $(subdir-y) $(subdir-m))

# if $(foo-objs), $(foo-y), or $(foo-m) 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)))

# $(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.a, $(obj-y))

# Replace multi-part objects by their individual parts,
# including built-in.a from subdirectories
real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
real-obj-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)))

# DTB
# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
extra-y				+= $(dtb-y)
extra-$(CONFIG_OF_ALL_DTBS)	+= $(dtb-)

# Add subdir path

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

# Finds the multi-part object the current object will be linked into.
# If the object belongs to two or more multi-part objects, all of them are
# concatenated with a colon separator.
modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
		$(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))

modname = $(if $(modname-multi),$(modname-multi),$(basetarget))

# These flags are needed for modversions and compiling, so we define them here
# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
# end up in (or would, if it gets compiled in)
name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))

orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
                 $(ccflags-y) $(CFLAGS_$(basetarget).o)
_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
                 $(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), $(CFLAGS_KASAN_NOSANITIZE))
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)     \
		 -include $(srctree)/include/linux/compiler_types.h       \
		 $(__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) $(LDFLAGS_$(@F))

DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes

dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
		 $(addprefix -I,$(DTC_INCLUDE))                          \
		 -undef -D__DTS__

# 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

# LEX
# ---------------------------------------------------------------------------
quiet_cmd_flex = LEX     $@
      cmd_flex = $(LEX) -o$@ -L $<

$(obj)/%.lex.c: $(src)/%.l FORCE
	$(call if_changed,flex)

# YACC
# ---------------------------------------------------------------------------
quiet_cmd_bison = YACC    $@
      cmd_bison = $(YACC) -o$@ -t -l $<

$(obj)/%.tab.c: $(src)/%.y FORCE
	$(call if_changed,bison)

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

$(obj)/%.tab.h: $(src)/%.y FORCE
	$(call if_changed,bison_h)

# 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) $(ld_flags) $(filter-out FORCE,$^) -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 ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
DTC_FLAGS += -Wno-unit_address_vs_reg \
	-Wno-unit_address_format \
	-Wno-avoid_unnecessary_addr_size \
	-Wno-alias_paths \
	-Wno-graph_child_address \
	-Wno-graph_port \
	-Wno-unique_unit_address \
	-Wno-pci_device_reg
endif

ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
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     $@
cmd_dt_S_dtb=						\
(							\
	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
	echo '.section .dtb.init.rodata,"a"';		\
	echo '.balign STRUCT_ALIGNMENT';		\
	echo '.global __dtb_$(subst -,_,$(*F))_begin';	\
	echo '__dtb_$(subst -,_,$(*F))_begin:';		\
	echo '.incbin "$<" ';				\
	echo '__dtb_$(subst -,_,$(*F))_end:';		\
	echo '.global __dtb_$(subst -,_,$(*F))_end';	\
	echo '.balign STRUCT_ALIGNMENT'; 		\
) > $@

$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
	$(call if_changed,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 \
		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)

$(obj)/%.dtb: $(src)/%.dts $(DTC) 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=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$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
b2441318	1	# SPDX-License-Identifier: GPL-2.0
f77bf014 SR	2	# Backward compatibility
	3	asflags-y += $(EXTRA_AFLAGS)
	4	ccflags-y += $(EXTRA_CFLAGS)
	5	cppflags-y += $(EXTRA_CPPFLAGS)
	6	ldflags-y += $(EXTRA_LDFLAGS)
	7
8fdc3fbb	8	# flags that take effect in current and sub directories
4e13d47c MY	9	KBUILD_AFLAGS += $(subdir-asflags-y)
4e13d47c MY	10	KBUILD_CFLAGS += $(subdir-ccflags-y)
720097d8	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
1da177e4 LT	17	obj-m := $(filter-out $(obj-y),$(obj-m))
	18
	19	# Libraries are always collected in one lib file.
	20	# Filter out objects already built-in
1da177e4 LT	21	lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
1da177e4 LT	22
8fdc3fbb C	23	# Determine modorder.
	24	# Unfortunately, we don't have information about ordering between -y
	25	# and -m subdirs. Just put -y's first.
	26	modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
1da177e4 LT	27
	28	# Handle objects in subdirs
	29	# ---------------------------------------------------------------------------
f49821ee	30	# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
1da177e4	31	# and add the directory to the list of dirs to descend into: $(subdir-y)
38385f8f	32	# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
1da177e4	33	# and add the directory to the list of dirs to descend into: $(subdir-m)
1da177e4 LT	34	__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
	35	subdir-y += $(__subdir-y)
	36	__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
	37	subdir-m += $(__subdir-m)
f49821ee	38	obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
1da177e4 LT	39	obj-m := $(filter-out %/, $(obj-m))
	40
	41	# Subdirectories we need to descend into
1da177e4 LT	42	subdir-ym := $(sort $(subdir-y) $(subdir-m))
1da177e4 LT	43
8fdc3fbb	44	# if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object
1da177e4	45	multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
cf4f2193	46	multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
1da177e4 LT	47	multi-used := $(multi-used-y) $(multi-used-m)
	48	single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
	49
f5fb9765 SR	50	# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
f5fb9765 SR	51	# tell kbuild to descend
f49821ee	52	subdir-obj-y := $(filter %/built-in.a, $(obj-y))
1da177e4	53
f98fe47c MY	54	# Replace multi-part objects by their individual parts,
	55	# including built-in.a from subdirectories
	56	real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
f5f33681	57	real-obj-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	58
7e7962dd MY	59	# DTB
	60	# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
	61	extra-y += $(dtb-y)
	62	extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
	63
1da177e4 LT	64	# Add subdir path
	65
	66	extra-y := $(addprefix $(obj)/,$(extra-y))
	67	always := $(addprefix $(obj)/,$(always))
	68	targets := $(addprefix $(obj)/,$(targets))
551559e1	69	modorder := $(addprefix $(obj)/,$(modorder))
1da177e4 LT	70	obj-m := $(addprefix $(obj)/,$(obj-m))
	71	lib-y := $(addprefix $(obj)/,$(lib-y))
	72	subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
f5f33681 MY	73	real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
f5f33681 MY	74	real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
1da177e4	75	single-used-m := $(addprefix $(obj)/,$(single-used-m))
1da177e4	76	multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
1da177e4	77	subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
1da177e4	78
c0152e9a MY	79	# Finds the multi-part object the current object will be linked into.
	80	# If the object belongs to two or more multi-part objects, all of them are
	81	# concatenated with a colon separator.
	82	modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
	83	$(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
	84
	85	modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
	86
1da177e4	87	# These flags are needed for modversions and compiling, so we define them here
8fdc3fbb	88	# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
1da177e4	89	# end up in (or would, if it gets compiled in)
b42841b7 MM	90	name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
b42841b7 MM	91	basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
aeacb019	92	modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
1da177e4	93
4e13d47c	94	orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
d8672b40	95	$(ccflags-y) $(CFLAGS_$(basetarget).o)
656ee82c	96	_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
4e13d47c	97	orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
d8672b40	98	$(asflags-y) $(AFLAGS_$(basetarget).o)
a7e137eb	99	_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
f77bf014	100	_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
1da177e4	101
2521f2c2 PO	102	#
	103	# Enable gcov profiling flags for a file, directory or for all files depending
	104	# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
	105	# (in this order)
	106	#
	107	ifeq ($(CONFIG_GCOV_KERNEL),y)
	108	_c_flags += $(if $(patsubst n%,, \
	109	$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
	110	$(CFLAGS_GCOV))
	111	endif
	112
0b24becc AR	113	#
	114	# Enable address sanitizer flags for kernel except some files or directories
	115	# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
	116	#
	117	ifeq ($(CONFIG_KASAN),y)
	118	_c_flags += $(if $(patsubst n%,, \
	119	$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
0e410e15	120	$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
0b24becc AR	121	endif
0b24becc AR	122
c6d30853 AR	123	ifeq ($(CONFIG_UBSAN),y)
	124	_c_flags += $(if $(patsubst n%,, \
	125	$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
	126	$(CFLAGS_UBSAN))
	127	endif
	128
5c9a8750 DV	129	ifeq ($(CONFIG_KCOV),y)
5c9a8750 DV	130	_c_flags += $(if $(patsubst n%,, \
a4691dea	131	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
5c9a8750 DV	132	$(CFLAGS_KCOV))
	133	endif
	134
1da177e4 LT	135	# If building the kernel in a separate objtree expand all occurrences
	136	# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
	137
	138	ifeq ($(KBUILD_SRC),)
	139	__c_flags = $(_c_flags)
	140	__a_flags = $(_a_flags)
	141	__cpp_flags = $(_cpp_flags)
	142	else
	143
1da177e4 LT	144	# -I$(obj) locates generated .h files
	145	# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
	146	# and locates generated .h files
	147	# FIXME: Replace both with specific CFLAGS* statements in the makefiles
4607ebf0	148	__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
db547ef1 AB	149	$(call flags,_c_flags)
	150	__a_flags = $(call flags,_a_flags)
	151	__cpp_flags = $(call flags,_cpp_flags)
1da177e4 LT	152	endif
1da177e4 LT	153
d8672b40	154	c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
a95b37e2	155	-include $(srctree)/include/linux/compiler_types.h \
d8672b40	156	$(__c_flags) $(modkern_cflags) \
b42841b7	157	$(basename_flags) $(modname_flags)
1da177e4	158
d8672b40	159	a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
1da177e4 LT	160	$(__a_flags) $(modkern_aflags)
1da177e4 LT	161
d8672b40 SR	162	cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
d8672b40 SR	163	$(__cpp_flags)
1da177e4	164
2fb9279f	165	ld_flags = $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
1da177e4	166
50f9ddaf MY	167	DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
50f9ddaf MY	168
b0a4d8b3	169	dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
50f9ddaf	170	$(addprefix -I,$(DTC_INCLUDE)) \
e570d7c1 SW	171	-undef -D__DTS__
e570d7c1 SW	172
c8589d1e MY	173	# Useful for describing the dependency of composite objects
	174	# Usage:
	175	# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
	176	define multi_depend
	177	$(foreach m, $(notdir $1), \
	178	$(eval $(obj)/$m: \
	179	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
	180	endef
	181
7373f4f8 AL	182	# LEX
7373f4f8 AL	183	# ---------------------------------------------------------------------------
7373f4f8	184	quiet_cmd_flex = LEX $@
eea199b4	185	cmd_flex = $(LEX) -o$@ -L $<
7373f4f8	186
833e6224	187	$(obj)/%.lex.c: $(src)/%.l FORCE
033dba2e	188	$(call if_changed,flex)
7373f4f8 AL	189
	190	# YACC
	191	# ---------------------------------------------------------------------------
7373f4f8	192	quiet_cmd_bison = YACC $@
eea199b4	193	cmd_bison = $(YACC) -o$@ -t -l $<
7373f4f8	194
833e6224	195	$(obj)/%.tab.c: $(src)/%.y FORCE
033dba2e	196	$(call if_changed,bison)
7373f4f8 AL	197
7373f4f8 AL	198	quiet_cmd_bison_h = YACC $@
d59fbbd0	199	cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $<
7373f4f8	200
833e6224	201	$(obj)/%.tab.h: $(src)/%.y FORCE
033dba2e MY	202	$(call if_changed,bison_h)
033dba2e MY	203
1da177e4 LT	204	# Shipped files
	205	# ===========================================================================
	206
	207	quiet_cmd_shipped = SHIPPED $@
	208	cmd_shipped = cat $< > $@
	209
991d76c9	210	$(obj)/%: $(src)/%_shipped
1da177e4 LT	211	$(call cmd,shipped)
	212
	213	# Commands useful for building a boot image
	214	# ===========================================================================
38385f8f	215	#
1da177e4 LT	216	# Use as following:
	217	#
	218	# target: source(s) FORCE
	219	# $(if_changed,ld/objcopy/gzip)
	220	#
836caba7	221	# and add target to extra-y so that we know we have to
1da177e4 LT	222	# read in the saved command line
	223
	224	# Linking
	225	# ---------------------------------------------------------------------------
	226
	227	quiet_cmd_ld = LD $@
2fb9279f	228	cmd_ld = $(LD) $(ld_flags) $(filter-out FORCE,$^) -o $@
1da177e4 LT	229
	230	# Objcopy
	231	# ---------------------------------------------------------------------------
	232
	233	quiet_cmd_objcopy = OBJCOPY $@
	234	cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
	235
	236	# Gzip
	237	# ---------------------------------------------------------------------------
	238
	239	quiet_cmd_gzip = GZIP $@
6ae9ecb8	240	cmd_gzip = (cat $(filter-out FORCE,$^) \| gzip -n -f -9 > $@) \|\| \
d3dd3b5a	241	(rm -f $@ ; false)
1da177e4	242
aab94339 DB	243	# DTC
aab94339 DB	244	# ---------------------------------------------------------------------------
6b22b3d1	245	DTC ?= $(objtree)/scripts/dtc/dtc
aab94339	246
bc553986	247	# Disable noisy checks by default
f759625a	248	ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
8654cb8d	249	DTC_FLAGS += -Wno-unit_address_vs_reg \
8654cb8d	250	-Wno-unit_address_format \
4fd98e37 RH	251	-Wno-avoid_unnecessary_addr_size \
4fd98e37 RH	252	-Wno-alias_paths \
74656b68 RH	253	-Wno-graph_child_address \
	254	-Wno-graph_port \
	255	-Wno-unique_unit_address \
8654cb8d	256	-Wno-pci_device_reg
bc553986 RH	257	endif
bc553986 RH	258
f759625a	259	ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
8654cb8d RH	260	DTC_FLAGS += -Wnode_name_chars_strict \
8654cb8d RH	261	-Wproperty_name_chars_strict
bc553986 RH	262	endif
bc553986 RH	263
331f7416 FR	264	DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
331f7416 FR	265
aab94339	266	# Generate an assembly file to wrap the output of the device tree compiler
1c00a47e	267	quiet_cmd_dt_S_dtb= DTB $@
aab94339 DB	268	cmd_dt_S_dtb= \
	269	( \
	270	echo '\#include <asm-generic/vmlinux.lds.h>'; \
	271	echo '.section .dtb.init.rodata,"a"'; \
	272	echo '.balign STRUCT_ALIGNMENT'; \
55fe6da9 JH	273	echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
55fe6da9 JH	274	echo '__dtb_$(subst -,_,$(*F))_begin:'; \
aab94339	275	echo '.incbin "$<" '; \
55fe6da9 JH	276	echo '__dtb_$(subst -,_,$(*F))_end:'; \
55fe6da9 JH	277	echo '.global __dtb_$(subst -,_,$(*F))_end'; \
aab94339 DB	278	echo '.balign STRUCT_ALIGNMENT'; \
	279	) > $@
	280
a7f92419 MY	281	$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
a7f92419 MY	282	$(call if_changed,dt_S_dtb)
aab94339 DB	283
aab94339 DB	284	quiet_cmd_dtc = DTC $@
77479b38 NR	285	cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
77479b38 NR	286	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
6b22b3d1	287	$(DTC) -O dtb -o $@ -b 0 \
50f9ddaf	288	$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
b0a4d8b3 IC	289	-d $(depfile).dtc.tmp $(dtc-tmp) ; \
b0a4d8b3 IC	290	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
1da177e4	291
b8fc5b21	292	$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
90b335fb SW	293	$(call if_changed_dep,dtc)
90b335fb SW	294
b0a4d8b3	295	dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
22435f38	296
bc22c17e AK	297	# Bzip2
	298	# ---------------------------------------------------------------------------
	299
d3dd3b5a PA	300	# Bzip2 and LZMA do not include size in file... so we have to fake that;
d3dd3b5a PA	301	# append the size as a 32-bit littleendian number as gzip does.
4a2ff67c	302	size_append = printf $(shell \
d3dd3b5a PA	303	dec_size=0; \
d3dd3b5a PA	304	for F in $1; do \
a670b0b4	305	fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
d3dd3b5a PA	306	dec_size=$$(expr $$dec_size + $$fsize); \
d3dd3b5a PA	307	done; \
1373411a JN	308	printf "%08x\n" $$dec_size \| \
	309	sed 's/\(..\)/\1 /g' \| { \
	310	read ch0 ch1 ch2 ch3; \
	311	for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
	312	printf '%s%03o' '\\' $$((0x$$ch)); \
	313	done; \
	314	} \
d3dd3b5a PA	315	)
	316
	317	quiet_cmd_bzip2 = BZIP2 $@
	318	cmd_bzip2 = (cat $(filter-out FORCE,$^) \| \
	319	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	320	(rm -f $@ ; false)
bc22c17e AK	321
	322	# Lzma
	323	# ---------------------------------------------------------------------------
	324
	325	quiet_cmd_lzma = LZMA $@
d3dd3b5a PA	326	cmd_lzma = (cat $(filter-out FORCE,$^) \| \
	327	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	328	(rm -f $@ ; false)
7dd65feb	329
2d74b2c6	330	quiet_cmd_lzo = LZO $@
7dd65feb AT	331	cmd_lzo = (cat $(filter-out FORCE,$^) \| \
	332	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	333	(rm -f $@ ; false)
d61931d8	334
e76e1fdf KL	335	quiet_cmd_lz4 = LZ4 $@
	336	cmd_lz4 = (cat $(filter-out FORCE,$^) \| \
	337	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	338	(rm -f $@ ; false)
	339
e3393645 SW	340	# U-Boot mkimage
	341	# ---------------------------------------------------------------------------
	342
	343	MKIMAGE := $(srctree)/scripts/mkuboot.sh
	344
	345	# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
	346	# the number of overrides in arch makefiles
	347	UIMAGE_ARCH ?= $(SRCARCH)
	348	UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
	349	UIMAGE_OPTS-y ?=
	350	UIMAGE_TYPE ?= kernel
	351	UIMAGE_LOADADDR ?= arch_must_set_this
	352	UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
	353	UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
	354	UIMAGE_IN ?= $<
	355	UIMAGE_OUT ?= $@
	356
	357	quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
	358	cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
	359	-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
	360	-T $(UIMAGE_TYPE) \
	361	-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
	362	-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
	363
24fa0402 LC	364	# XZ
	365	# ---------------------------------------------------------------------------
	366	# Use xzkern to compress the kernel image and xzmisc to compress other things.
	367	#
	368	# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
	369	# of the kernel decompressor. A BCJ filter is used if it is available for
	370	# the target architecture. xzkern also appends uncompressed size of the data
	371	# using size_append. The .xz format has the size information available at
	372	# the end of the file too, but it's in more complex format and it's good to
	373	# avoid changing the part of the boot code that reads the uncompressed size.
	374	# Note that the bytes added by size_append will make the xz tool think that
	375	# the file is corrupt. This is expected.
	376	#
	377	# xzmisc doesn't use size_append, so it can be used to create normal .xz
	378	# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
	379	# big dictionary would increase the memory usage too much in the multi-call
	380	# decompression mode. A BCJ filter isn't used either.
	381	quiet_cmd_xzkern = XZKERN $@
	382	cmd_xzkern = (cat $(filter-out FORCE,$^) \| \
	383	sh $(srctree)/scripts/xz_wrap.sh && \
	384	$(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	385	(rm -f $@ ; false)
	386
	387	quiet_cmd_xzmisc = XZMISC $@
	388	cmd_xzmisc = (cat $(filter-out FORCE,$^) \| \
	389	xz --check=crc32 --lzma2=dict=1MiB) > $@ \|\| \
	390	(rm -f $@ ; false)
ebf003f0 MK	391
	392	# ASM offsets
	393	# ---------------------------------------------------------------------------
	394
	395	# Default sed regexp - multiline due to syntax constraints
cf0c3e68 JH	396	#
	397	# Use [:space:] because LLVM's integrated assembler inserts <tab> around
	398	# the .ascii directive whereas GCC keeps the <space> as-is.
ebf003f0	399	define sed-offsets
cf0c3e68 JH	400	's:^[[:space:]]\.ascii[[:space:]]"\(.\)".:\1:; \
cf0c3e68 JH	401	/^->/{s:->#\(.\):/ \1 */:; \
ebf003f0	402	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
cf0c3e68	403	s:->::; p;}'
ebf003f0 MK	404	endef
	405
	406	# Use filechk to avoid rebuilds when a header changes, but the resulting file
	407	# does not
	408	define filechk_offsets
	409	(set -e; \
	410	echo "#ifndef $2"; \
	411	echo "#define $2"; \
	412	echo "/*"; \
	413	echo " * DO NOT MODIFY."; \
	414	echo " *"; \
	415	echo " * This file was generated by Kbuild"; \
	416	echo " */"; \
	417	echo ""; \
43fee2b2	418	sed -ne $(sed-offsets) < $<; \
ebf003f0 MK	419	echo ""; \
	420	echo "#endif" )
	421	endef