[linux.git] / scripts / Kbuild.include

####
# kbuild: Generic definitions

# Convenient variables
comma   := ,
quote   := "
squote  := '
empty   :=
space   := $(empty) $(empty)
space_escape := _-_SPACE_-_
pound := \#

###
# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
dot-target = $(dir $@).$(notdir $@)

###
# The temporary file to save gcc -MD generated dependencies must not
# contain a comma
depfile = $(subst $(comma),_,$(dot-target).d)

###
# filename of target with directory and extension stripped
basetarget = $(basename $(notdir $@))

###
# real prerequisites without phony targets
real-prereqs = $(filter-out $(PHONY), $^)

###
# Escape single quote for use in echo statements
escsq = $(subst $(squote),'\$(squote)',$1)

###
# Easy method for doing a status message
       kecho := :
 quiet_kecho := echo
silent_kecho := :
kecho := $($(quiet)kecho)

###
# filechk is used to check if the content of a generated file is updated.
# Sample usage:
#
# filechk_sample = echo $(KERNELRELEASE)
# version.h: FORCE
#	$(call filechk,sample)
#
# The rule defined shall write to stdout the content of the new file.
# The existing file will be compared with the new one.
# - If no file exist it is created
# - If the content differ the new file is used
# - If they are equal no change, and no timestamp update
# - stdin is piped in from the first prerequisite ($<) so one has
#   to specify a valid file as first prerequisite (often the kbuild file)
define filechk
	$(Q)set -e;				\
	mkdir -p $(dir $@);			\
	{ $(filechk_$(1)); } > [email protected];		\
	if [ -r $@ ] && cmp -s $@ [email protected]; then	\
		rm -f [email protected];			\
	else					\
		$(kecho) '  UPD     $@';	\
		mv -f [email protected] $@;		\
	fi
endef

######
# gcc support functions
# See documentation in Documentation/kbuild/makefiles.txt

# cc-cross-prefix
# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
# Return first <prefix> where a <prefix>gcc is found in PATH.
# If no gcc found in PATH with listed prefixes return nothing
cc-cross-prefix = $(firstword $(foreach c, $(filter-out -%, $(1)), \
					$(if $(shell which $(c)gcc), $(c))))

# output directory for tests below
TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)

# try-run
# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
# Exit code chooses option. "$$TMP" serves as a temporary file and is
# automatically cleaned up.
try-run = $(shell set -e;		\
	TMP="$(TMPOUT).$$$$.tmp";	\
	TMPO="$(TMPOUT).$$$$.o";	\
	if ($(1)) >/dev/null 2>&1;	\
	then echo "$(2)";		\
	else echo "$(3)";		\
	fi;				\
	rm -f "$$TMP" "$$TMPO")

# as-option
# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)

as-option = $(call try-run,\
	$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))

# as-instr
# Usage: cflags-y += $(call as-instr,instr,option1,option2)

as-instr = $(call try-run,\
	printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))

# __cc-option
# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
__cc-option = $(call try-run,\
	$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))

# Do not attempt to build with gcc plugins during cc-option tests.
# (And this uses delayed resolution so the flags will be up to date.)
CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))

# cc-option
# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)

cc-option = $(call __cc-option, $(CC),\
	$(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))

# hostcc-option
# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
hostcc-option = $(call __cc-option, $(HOSTCC),\
	$(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))

# cc-option-yn
# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
cc-option-yn = $(call try-run,\
	$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)

# cc-disable-warning
# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
cc-disable-warning = $(call try-run,\
	$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))

# cc-version
cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))

# cc-ifversion
# Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))

# cc-ldoption
# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
cc-ldoption = $(call try-run,\
	$(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))

# ld-option
# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))

# ar-option
# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
# Important: no spaces around options
ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))

# ld-version
# Note this is mainly for HJ Lu's 3 number binutil versions
ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)

# ld-ifversion
# Usage:  $(call ld-ifversion, -ge, 22252, y)
ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))

######

###
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
# Usage:
# $(Q)$(MAKE) $(build)=dir
build := -f $(srctree)/scripts/Makefile.build obj

###
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
# Usage:
# $(Q)$(MAKE) $(modbuiltin)=dir
modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj

###
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
# Usage:
# $(Q)$(MAKE) $(dtbinst)=dir
dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj

###
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
# Usage:
# $(Q)$(MAKE) $(clean)=dir
clean := -f $(srctree)/scripts/Makefile.clean obj

###
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
# Usage:
# $(Q)$(MAKE) $(hdr-inst)=dir
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj

# Prefix -I with $(srctree) if it is not an absolute path.
# skip if -I has no parameter
addtree = $(if $(patsubst -I%,%,$(1)), \
$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1))

# Find all -I options and call addtree
flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))

# echo command.
# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
echo-cmd = $(if $($(quiet)cmd_$(1)),\
	echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)

# printing commands
cmd = @set -e; $(echo-cmd) $(cmd_$(1))

# Add $(obj)/ for paths that are not absolute
objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))

###
# if_changed      - execute command if any prerequisite is newer than
#                   target, or command line has changed
# if_changed_dep  - as if_changed, but uses fixdep to reveal dependencies
#                   including used config symbols
# if_changed_rule - as if_changed but execute rule instead
# See Documentation/kbuild/makefiles.txt for more info

ifneq ($(KBUILD_NOCMDDEP),1)
# Check if both arguments are the same including their order. Result is empty
# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
                         $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
else
arg-check = $(if $(strip $(cmd_$@)),,1)
endif

# Replace >$< with >$$< to preserve $ when reloading the .cmd file
# (needed for make)
# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
# (needed for make)
# Replace >'< with >'\''< to be able to enclose the whole string in '...'
# (needed for the shell)
make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))

# Find any prerequisites that is newer than target or that does not exist.
# PHONY targets skipped in both cases.
any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)

# Execute command if command has changed or prerequisite(s) are updated.
if_changed = $(if $(strip $(any-prereq) $(arg-check)),                       \
	$(cmd);                                                              \
	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)

# Execute the command and also postprocess generated .d dependencies file.
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:)

cmd_and_fixdep =                                                             \
	$(cmd);                                                              \
	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
	rm -f $(depfile)

# Usage: $(call if_changed_rule,foo)
# Will check if $(cmd_foo) or any of the prerequisites changed,
# and if so will execute $(rule_foo).
if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:)

###
# why - tell why a target got built
#       enabled by make V=2
#       Output (listed in the order they are checked):
#          (1) - due to target is PHONY
#          (2) - due to target missing
#          (3) - due to: file1.h file2.h
#          (4) - due to command line change
#          (5) - due to missing .cmd file
#          (6) - due to target not in $(targets)
# (1) PHONY targets are always build
# (2) No target, so we better build it
# (3) Prerequisite is newer than target
# (4) The command line stored in the file named dir/.target.cmd
#     differed from actual command line. This happens when compiler
#     options changes
# (5) No dir/.target.cmd file (used to store command line)
# (6) No dir/.target.cmd file and target not listed in $(targets)
#     This is a good hint that there is a bug in the kbuild file
ifeq ($(KBUILD_VERBOSE),2)
why =                                                                        \
    $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
        $(if $(wildcard $@),                                                 \
            $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \
                $(if $(arg-check),                                           \
                    $(if $(cmd_$@),- due to command line change,             \
                        $(if $(filter $@, $(targets)),                       \
                            - due to missing .cmd file,                      \
                            - due to $(notdir $@) not in $$(targets)         \
                         )                                                   \
                     )                                                       \
                 )                                                           \
             ),                                                              \
             - due to target missing                                         \
         )                                                                   \
     )

echo-why = $(call escsq, $(strip $(why)))
endif

###############################################################################
#
# When a Kconfig string contains a filename, it is suitable for
# passing to shell commands. It is surrounded by double-quotes, and
# any double-quotes or backslashes within it are escaped by
# backslashes.
#
# This is no use for dependencies or $(wildcard). We need to strip the
# surrounding quotes and the escaping from quotes and backslashes, and
# we *do* need to escape any spaces in the string. So, for example:
#
# Usage: $(eval $(call config_filename,FOO))
#
# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
# transformed as described above to be suitable for use within the
# makefile.
#
# Also, if the filename is a relative filename and exists in the source
# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
# be prefixed to *both* command invocation and dependencies.
#
# Note: We also print the filenames in the quiet_cmd_foo text, and
# perhaps ought to have a version specially escaped for that purpose.
# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
# enough.  It'll strip the quotes in the common case where there's no
# space and it's a simple filename, and it'll retain the quotes when
# there's a space. There are some esoteric cases in which it'll print
# the wrong thing, but we don't really care. The actual dependencies
# and commands *do* get it right, with various combinations of single
# and double quotes, backslashes and spaces in the filenames.
#
###############################################################################
#
define config_filename
ifneq ($$(CONFIG_$(1)),"")
$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
else
ifeq ($$(wildcard $$($(1)_FILENAME)),)
ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
$(1)_SRCPREFIX := $(srctree)/
endif
endif
endif
endif
endef
#
###############################################################################

# delete partially updated (i.e. corrupted) files on error
.DELETE_ON_ERROR:

# do not delete intermediate files automatically
.SECONDARY:
Commit	Line	Data
8ec4b4ff SR	1	####
	2	# kbuild: Generic definitions
	3
beda9f3a	4	# Convenient variables
8ec4b4ff	5	comma := ,
13338935	6	quote := "
d51bfb78	7	squote := '
8ec4b4ff SR	8	empty :=
8ec4b4ff SR	9	space := $(empty) $(empty)
9c8fa9bc	10	space_escape := _-_SPACE_-_
9564a8cf	11	pound := \#
8ec4b4ff	12
48f1f058 SR	13	###
	14	# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
	15	dot-target = $(dir $@).$(notdir $@)
	16
8ec4b4ff SR	17	###
	18	# The temporary file to save gcc -MD generated dependencies must not
	19	# contain a comma
48f1f058	20	depfile = $(subst $(comma),_,$(dot-target).d)
8ec4b4ff	21
5e8d780d SR	22	###
	23	# filename of target with directory and extension stripped
	24	basetarget = $(basename $(notdir $@))
	25
afa974b7 MY	26	###
	27	# real prerequisites without phony targets
	28	real-prereqs = $(filter-out $(PHONY), $^)
	29
d51bfb78 SR	30	###
	31	# Escape single quote for use in echo statements
	32	escsq = $(subst $(squote),'\$(squote)',$1)
	33
5410ecc0 MF	34	###
	35	# Easy method for doing a status message
	36	kecho := :
	37	quiet_kecho := echo
	38	silent_kecho := :
	39	kecho := $($(quiet)kecho)
	40
8ec4b4ff SR	41	###
	42	# filechk is used to check if the content of a generated file is updated.
	43	# Sample usage:
ba97df45 MY	44	#
	45	# filechk_sample = echo $(KERNELRELEASE)
	46	# version.h: FORCE
8ec4b4ff	47	# $(call filechk,sample)
ba97df45	48	#
8ec4b4ff SR	49	# The rule defined shall write to stdout the content of the new file.
	50	# The existing file will be compared with the new one.
	51	# - If no file exist it is created
	52	# - If the content differ the new file is used
	53	# - If they are equal no change, and no timestamp update
	54	# - stdin is piped in from the first prerequisite ($<) so one has
	55	# to specify a valid file as first prerequisite (often the kbuild file)
	56	define filechk
	57	$(Q)set -e; \
8ec4b4ff	58	mkdir -p $(dir $@); \
ad774086	59	{ $(filechk_$(1)); } > [email protected]; \
8ec4b4ff SR	60	if [ -r $@ ] && cmp -s $@ [email protected]; then \
	61	rm -f [email protected]; \
	62	else \
fd54f502	63	$(kecho) ' UPD $@'; \
8ec4b4ff SR	64	mv -f [email protected] $@; \
	65	fi
	66	endef
	67
20a468b5	68	######
9d6e7a70	69	# gcc support functions
20a468b5 SR	70	# See documentation in Documentation/kbuild/makefiles.txt
20a468b5 SR	71
910b4046 SR	72	# cc-cross-prefix
910b4046 SR	73	# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
bd55f96f MY	74	# Return first <prefix> where a <prefix>gcc is found in PATH.
	75	# If no gcc found in PATH with listed prefixes return nothing
	76	cc-cross-prefix = $(firstword $(foreach c, $(filter-out -%, $(1)), \
	77	$(if $(shell which $(c)gcc), $(c))))
910b4046	78
beda9f3a RZ	79	# output directory for tests below
	80	TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
	81
	82	# try-run
	83	# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
312a3d09 C	84	# Exit code chooses option. "$$TMP" serves as a temporary file and is
312a3d09 C	85	# automatically cleaned up.
e08d6de4	86	try-run = $(shell set -e; \
beda9f3a	87	TMP="$(TMPOUT).$$$$.tmp"; \
691ef3e7	88	TMPO="$(TMPOUT).$$$$.o"; \
beda9f3a RZ	89	if ($(1)) >/dev/null 2>&1; \
	90	then echo "$(2)"; \
	91	else echo "$(3)"; \
	92	fi; \
e08d6de4	93	rm -f "$$TMP" "$$TMPO")
347a00fb	94
20a468b5	95	# as-option
bff288c1	96	# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
beda9f3a	97
e08d6de4	98	as-option = $(call try-run,\
b1e0d8b7	99	$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
20a468b5	100
e2414910	101	# as-instr
bff288c1	102	# Usage: cflags-y += $(call as-instr,instr,option1,option2)
beda9f3a	103
e08d6de4	104	as-instr = $(call try-run,\
b1e0d8b7	105	printf "%b\n" "$(1)" \| $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
e2414910	106
9f3f1fd2 MK	107	# __cc-option
9f3f1fd2 MK	108	# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
e08d6de4	109	__cc-option = $(call try-run,\
9f3f1fd2 MK	110	$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
9f3f1fd2 MK	111
d26e9414 ER	112	# Do not attempt to build with gcc plugins during cc-option tests.
d26e9414 ER	113	# (And this uses delayed resolution so the flags will be up to date.)
6ac38934	114	CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
d26e9414	115
20a468b5	116	# cc-option
bff288c1	117	# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
beda9f3a	118
9f3f1fd2 MK	119	cc-option = $(call __cc-option, $(CC),\
	120	$(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
	121
	122	# hostcc-option
	123	# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
	124	hostcc-option = $(call __cc-option, $(HOSTCC),\
96f14fe7	125	$(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
20a468b5 SR	126
20a468b5 SR	127	# cc-option-yn
bff288c1	128	# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
e08d6de4	129	cc-option-yn = $(call try-run,\
c3f0d0bc	130	$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
20a468b5	131
8417da6f MM	132	# cc-disable-warning
8417da6f MM	133	# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
e08d6de4	134	cc-disable-warning = $(call try-run,\
c3f0d0bc	135	$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
8417da6f	136
20a468b5	137	# cc-version
e08d6de4	138	cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
20a468b5 SR	139
	140	# cc-ifversion
	141	# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
6dcb4e5e	142	cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) \|\| echo $(4))
20a468b5	143
f86fd306 SR	144	# cc-ldoption
f86fd306 SR	145	# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
e08d6de4	146	cc-ldoption = $(call try-run,\
86a9df59	147	$(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
5de043f4	148
691ef3e7	149	# ld-option
d503ac53 MY	150	# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
d503ac53 MY	151	ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
691ef3e7	152
40df759e MM	153	# ar-option
	154	# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
	155	# Important: no spaces around options
e08d6de4	156	ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
40df759e	157
ccbef167	158	# ld-version
ccbef167	159	# Note this is mainly for HJ Lu's 3 number binutil versions
e08d6de4	160	ld-version = $(shell $(LD) --version \| $(srctree)/scripts/ld-version.sh)
ccbef167 AK	161
	162	# ld-ifversion
	163	# Usage: $(call ld-ifversion, -ge, 22252, y)
6dcb4e5e	164	ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) \|\| echo $(4))
ccbef167	165
5de043f4	166	######
0b0bf7a3	167
beda9f3a	168	###
8ec4b4ff SR	169	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
	170	# Usage:
	171	# $(Q)$(MAKE) $(build)=dir
5b2389b4	172	build := -f $(srctree)/scripts/Makefile.build obj
8ec4b4ff	173
bc081dd6 MM	174	###
	175	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
	176	# Usage:
	177	# $(Q)$(MAKE) $(modbuiltin)=dir
5b2389b4	178	modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
bc081dd6	179
9fb5e537 RR	180	###
	181	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
	182	# Usage:
	183	# $(Q)$(MAKE) $(dtbinst)=dir
487c7c77	184	dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
9fb5e537	185
371fdc77 MY	186	###
	187	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
	188	# Usage:
	189	# $(Q)$(MAKE) $(clean)=dir
	190	clean := -f $(srctree)/scripts/Makefile.clean obj
	191
	192	###
1846dfbd	193	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
371fdc77 MY	194	# Usage:
371fdc77 MY	195	# $(Q)$(MAKE) $(hdr-inst)=dir
1846dfbd	196	hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
371fdc77	197
beda9f3a	198	# Prefix -I with $(srctree) if it is not an absolute path.
5b91c33c SR	199	# skip if -I has no parameter
5b91c33c SR	200	addtree = $(if $(patsubst -I%,%,$(1)), \
48f6e3cf	201	$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1))
5de043f4	202
d9df92e2	203	# Find all -I options and call addtree
beda9f3a	204	flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
d9df92e2	205
5de043f4 OV	206	# echo command.
5de043f4 OV	207	# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
bff288c1	208	echo-cmd = $(if $($(quiet)cmd_$(1)),\
5de043f4 OV	209	echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
	210
	211	# printing commands
3a2429e1	212	cmd = @set -e; $(echo-cmd) $(cmd_$(1))
8ec4b4ff	213
5de043f4	214	# Add $(obj)/ for paths that are not absolute
bff288c1	215	objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
0a504f25	216
8ec4b4ff	217	###
5de043f4	218	# if_changed - execute command if any prerequisite is newer than
8ec4b4ff SR	219	# target, or command line has changed
	220	# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
	221	# including used config symbols
	222	# if_changed_rule - as if_changed but execute rule instead
	223	# See Documentation/kbuild/makefiles.txt for more info
	224
	225	ifneq ($(KBUILD_NOCMDDEP),1)
9c8fa9bc MY	226	# Check if both arguments are the same including their order. Result is empty
	227	# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
	228	arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
	229	$(subst $(space),$(space_escape),$(strip $(cmd_$1))))
c4d5ee13 MM	230	else
c4d5ee13 MM	231	arg-check = $(if $(strip $(cmd_$@)),,1)
8ec4b4ff SR	232	endif
8ec4b4ff SR	233
164f0d2e MM	234	# Replace >$< with >$$< to preserve $ when reloading the .cmd file
164f0d2e MM	235	# (needed for make)
9564a8cf	236	# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
164f0d2e MM	237	# (needed for make)
	238	# Replace >'< with >'\''< to be able to enclose the whole string in '...'
	239	# (needed for the shell)
9564a8cf	240	make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
6176aa9a	241
48f1f058 SR	242	# Find any prerequisites that is newer than target or that does not exist.
	243	# PHONY targets skipped in both cases.
	244	any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
	245
5de043f4	246	# Execute command if command has changed or prerequisite(s) are updated.
48f1f058	247	if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
67126965	248	$(cmd); \
2aedcd09	249	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
8ec4b4ff	250
5de043f4	251	# Execute the command and also postprocess generated .d dependencies file.
3a2429e1	252	if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:)
c1a95fda	253
e4aca459	254	cmd_and_fixdep = \
3a2429e1	255	$(cmd); \
392885ee	256	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
e5d28910	257	rm -f $(depfile)
c1a95fda	258
8ec4b4ff	259	# Usage: $(call if_changed_rule,foo)
beda9f3a RZ	260	# Will check if $(cmd_foo) or any of the prerequisites changed,
beda9f3a RZ	261	# and if so will execute $(rule_foo).
3a2429e1	262	if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:)
48f1f058	263
45d506bd	264	###
312a3d09	265	# why - tell why a target got built
45d506bd SR	266	# enabled by make V=2
	267	# Output (listed in the order they are checked):
	268	# (1) - due to target is PHONY
	269	# (2) - due to target missing
	270	# (3) - due to: file1.h file2.h
	271	# (4) - due to command line change
	272	# (5) - due to missing .cmd file
	273	# (6) - due to target not in $(targets)
	274	# (1) PHONY targets are always build
	275	# (2) No target, so we better build it
	276	# (3) Prerequisite is newer than target
	277	# (4) The command line stored in the file named dir/.target.cmd
	278	# differed from actual command line. This happens when compiler
	279	# options changes
	280	# (5) No dir/.target.cmd file (used to store command line)
	281	# (6) No dir/.target.cmd file and target not listed in $(targets)
	282	# This is a good hint that there is a bug in the kbuild file
	283	ifeq ($(KBUILD_VERBOSE),2)
	284	why = \
	285	$(if $(filter $@, $(PHONY)),- due to target is PHONY, \
	286	$(if $(wildcard $@), \
	287	$(if $(strip $(any-prereq)),- due to: $(any-prereq), \
	288	$(if $(arg-check), \
	289	$(if $(cmd_$@),- due to command line change, \
	290	$(if $(filter $@, $(targets)), \
	291	- due to missing .cmd file, \
	292	- due to $(notdir $@) not in $$(targets) \
	293	) \
	294	) \
	295	) \
	296	), \
	297	- due to target missing \
	298	) \
	299	)
	300
	301	echo-why = $(call escsq, $(strip $(why)))
	302	endif
3ee550f1 DW	303
	304	###############################################################################
	305	#
	306	# When a Kconfig string contains a filename, it is suitable for
	307	# passing to shell commands. It is surrounded by double-quotes, and
	308	# any double-quotes or backslashes within it are escaped by
	309	# backslashes.
	310	#
	311	# This is no use for dependencies or $(wildcard). We need to strip the
	312	# surrounding quotes and the escaping from quotes and backslashes, and
	313	# we do need to escape any spaces in the string. So, for example:
	314	#
	315	# Usage: $(eval $(call config_filename,FOO))
	316	#
	317	# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
	318	# transformed as described above to be suitable for use within the
	319	# makefile.
	320	#
	321	# Also, if the filename is a relative filename and exists in the source
	322	# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
	323	# be prefixed to both command invocation and dependencies.
	324	#
	325	# Note: We also print the filenames in the quiet_cmd_foo text, and
	326	# perhaps ought to have a version specially escaped for that purpose.
	327	# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
	328	# enough. It'll strip the quotes in the common case where there's no
	329	# space and it's a simple filename, and it'll retain the quotes when
	330	# there's a space. There are some esoteric cases in which it'll print
	331	# the wrong thing, but we don't really care. The actual dependencies
	332	# and commands do get it right, with various combinations of single
	333	# and double quotes, backslashes and spaces in the filenames.
	334	#
	335	###############################################################################
	336	#
3ee550f1 DW	337	define config_filename
	338	ifneq ($$(CONFIG_$(1)),"")
	339	$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
	340	ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
	341	else
	342	ifeq ($$(wildcard $$($(1)_FILENAME)),)
	343	ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
	344	$(1)_SRCPREFIX := $(srctree)/
	345	endif
	346	endif
	347	endif
	348	endif
	349	endef
	350	#
	351	###############################################################################
9c2af1c7 MY	352
	353	# delete partially updated (i.e. corrupted) files on error
	354	.DELETE_ON_ERROR:
8e9b61b2 MY	355
	356	# do not delete intermediate files automatically
	357	.SECONDARY: