[J-u-boot.git] / scripts / Kbuild.include

####
# kbuild: Generic definitions

# Convenient variables
comma   := ,
quote   := "
squote  := '
empty   :=
space   := $(empty) $(empty)
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 $@))

###
# filename of first prerequisite with directory and extension stripped
baseprereq = $(basename $(notdir $<))

###
# 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:
# define filechk_sample
#	echo $KERNELRELEASE
# endef
# version.h : Makefile
#	$(call filechk,sample)
# The rule defined shall write to stdout the content of the new file.
# The existing file will be compared with the new one.
# - If no file exist it is created
# - If the content differ the new file is used
# - If they are equal no change, and no timestamp update
# - stdin is piped in from the first prerequisite ($<) so one has
#   to specify a valid file as first prerequisite (often the kbuild file)
define filechk
	$(Q)set -e;				\
	$(kecho) '  CHK     $@';		\
	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 := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
# Return first prefix where a prefix$(CC) is found in PATH.
# If no $(CC) found in PATH with listed prefixes return nothing
cc-cross-prefix =  \
	$(word 1, $(foreach c,$(1),                                   \
		$(shell set -e;                                       \
		if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
			echo $(c);                                    \
		fi)))

# 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" is can be used as temporary file and
# is automatically cleaned up.
# modifed for U-Boot: prevent cc-option from leaving .*.su files
try-run = $(shell set -e;		\
	TMP="$(TMPOUT).$$$$.tmp";	\
	TMPO="$(TMPOUT).$$$$.o";	\
	TMPSU="$(TMPOUT).$$$$.su";	\
	if ($(1)) >/dev/null 2>&1;	\
	then echo "$(2)";		\
	else echo "$(3)";		\
	fi;				\
	rm -f "$$TMP" "$$TMPO" "$$TMPSU")

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

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

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

# cc-option-align
# Prefix align with either -falign or -malign
cc-option-align = $(subst -functions=0,,\
	$(call cc-option,-falign-functions=0,-malign-functions=0))

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

# cc-name
# Expands to either gcc or clang
cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)

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

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

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

# added for U-Boot
binutils-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/binutils-version.sh $(AS))
dtc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/dtc-version.sh $(DTC))

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

# ld-option
# Usage: LDFLAGS += $(call ld-option, -X)
ld-option = $(call try-run,\
	$(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))

# 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 $(if $(KBUILD_SRC),$(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 $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(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 = @$(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 has same arguments. Result is empty string if equal.
# User may override this check using make KBUILD_NOCMDDEP=1
arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
                    $(filter-out $(cmd_$@),   $(cmd_$(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)),                       \
	@set -e;                                                             \
	$(echo-cmd) $(cmd_$(1));                                             \
	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) ),                  \
	@set -e;                                                             \
	$(echo-cmd) $(cmd_$(1));                                             \
	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
	rm -f $(depfile);                                                    \
	mv -f $(dot-target).tmp $(dot-target).cmd)

# 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) ),                 \
	@set -e;                                                             \
	$(rule_$(1)))

###
# why - tell why a a target got build
#       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

ifdef CONFIG_SPL_BUILD
SPL_ := SPL_
ifeq ($(CONFIG_TPL_BUILD),y)
SPL_TPL_ := TPL_
else
SPL_TPL_ := SPL_
endif
else
SPL_ :=
SPL_TPL_ :=
endif
Commit	Line	Data
ceec4c87 MY	1	####
	2	# kbuild: Generic definitions
	3
	4	# Convenient variables
	5	comma := ,
598e2d33	6	quote := "
ceec4c87 MY	7	squote := '
	8	empty :=
	9	space := $(empty) $(empty)
e5e701c2	10	pound := \#
ceec4c87 MY	11
	12	###
	13	# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
	14	dot-target = $(dir $@).$(notdir $@)
	15
	16	###
	17	# The temporary file to save gcc -MD generated dependencies must not
	18	# contain a comma
	19	depfile = $(subst $(comma),_,$(dot-target).d)
	20
	21	###
	22	# filename of target with directory and extension stripped
	23	basetarget = $(basename $(notdir $@))
	24
	25	###
	26	# filename of first prerequisite with directory and extension stripped
	27	baseprereq = $(basename $(notdir $<))
	28
	29	###
	30	# Escape single quote for use in echo statements
	31	escsq = $(subst $(squote),'\$(squote)',$1)
	32
	33	###
	34	# Easy method for doing a status message
	35	kecho := :
	36	quiet_kecho := echo
	37	silent_kecho := :
	38	kecho := $($(quiet)kecho)
	39
	40	###
	41	# filechk is used to check if the content of a generated file is updated.
	42	# Sample usage:
	43	# define filechk_sample
	44	# echo $KERNELRELEASE
	45	# endef
	46	# version.h : Makefile
	47	# $(call filechk,sample)
	48	# The rule defined shall write to stdout the content of the new file.
	49	# The existing file will be compared with the new one.
	50	# - If no file exist it is created
	51	# - If the content differ the new file is used
	52	# - If they are equal no change, and no timestamp update
	53	# - stdin is piped in from the first prerequisite ($<) so one has
	54	# to specify a valid file as first prerequisite (often the kbuild file)
	55	define filechk
	56	$(Q)set -e; \
	57	$(kecho) ' CHK $@'; \
	58	mkdir -p $(dir $@); \
	59	$(filechk_$(1)) < $< > [email protected]; \
	60	if [ -r $@ ] && cmp -s $@ [email protected]; then \
	61	rm -f [email protected]; \
	62	else \
	63	$(kecho) ' UPD $@'; \
	64	mv -f [email protected] $@; \
	65	fi
	66	endef
	67
	68	######
	69	# gcc support functions
	70	# See documentation in Documentation/kbuild/makefiles.txt
	71
	72	# cc-cross-prefix
	73	# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
	74	# Return first prefix where a prefix$(CC) is found in PATH.
75	# If no $(CC) found in PATH with listed prefixes return nothing
76	cc-cross-prefix = \
77	$(word 1, $(foreach c,$(1), \
78	$(shell set -e; \
79	if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
80	echo $(c); \
81	fi)))
82
83	# output directory for tests below
84	TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
85
86	# try-run
87	# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
88	# Exit code chooses option. "$$TMP" is can be used as temporary file and
89	# is automatically cleaned up.
9a368d0f	90	# modifed for U-Boot: prevent cc-option from leaving .*.su files
ceec4c87 MY	91	try-run = $(shell set -e; \
	92	TMP="$(TMPOUT).$$$$.tmp"; \
	93	TMPO="$(TMPOUT).$$$$.o"; \
9a368d0f	94	TMPSU="$(TMPOUT).$$$$.su"; \
ceec4c87 MY	95	if ($(1)) >/dev/null 2>&1; \
	96	then echo "$(2)"; \
	97	else echo "$(3)"; \
	98	fi; \
9a368d0f	99	rm -f "$$TMP" "$$TMPO" "$$TMPSU")
ceec4c87 MY	100
	101	# as-option
	102	# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
	103
	104	as-option = $(call try-run,\
	105	$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
	106
	107	# as-instr
	108	# Usage: cflags-y += $(call as-instr,instr,option1,option2)
	109
	110	as-instr = $(call try-run,\
	111	printf "%b\n" "$(1)" \| $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
	112
	113	# cc-option
	114	# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
	115
	116	cc-option = $(call try-run,\
1401d87b	117	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
ceec4c87 MY	118
	119	# cc-option-yn
	120	# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
	121	cc-option-yn = $(call try-run,\
1401d87b	122	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
ceec4c87 MY	123
	124	# cc-option-align
	125	# Prefix align with either -falign or -malign
	126	cc-option-align = $(subst -functions=0,,\
	127	$(call cc-option,-falign-functions=0,-malign-functions=0))
	128
	129	# cc-disable-warning
	130	# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
	131	cc-disable-warning = $(call try-run,\
	132	$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
	133
29c4d281 TR	134	# cc-name
	135	# Expands to either gcc or clang
	136	cc-name = $(shell $(CC) -v 2>&1 \| grep -q "clang version" && echo clang \|\| echo gcc)
	137
ceec4c87	138	# cc-version
ceec4c87 MY	139	cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
	140
	141	# cc-fullversion
ceec4c87 MY	142	cc-fullversion = $(shell $(CONFIG_SHELL) \
	143	$(srctree)/scripts/gcc-version.sh -p $(CC))
	144
	145	# cc-ifversion
	146	# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
98bd0e0d	147	cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) \|\| echo $(4))
ceec4c87	148
bf4b3de1 MY	149	# added for U-Boot
	150	binutils-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/binutils-version.sh $(AS))
	151	dtc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/dtc-version.sh $(DTC))
	152
ceec4c87 MY	153	# cc-ldoption
	154	# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
	155	cc-ldoption = $(call try-run,\
	156	$(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
	157
	158	# ld-option
	159	# Usage: LDFLAGS += $(call ld-option, -X)
	160	ld-option = $(call try-run,\
	161	$(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
	162
	163	# ar-option
	164	# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
	165	# Important: no spaces around options
	166	ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
	167
598e2d33	168	# ld-version
598e2d33 MY	169	# Note this is mainly for HJ Lu's 3 number binutil versions
	170	ld-version = $(shell $(LD) --version \| $(srctree)/scripts/ld-version.sh)
	171
	172	# ld-ifversion
	173	# Usage: $(call ld-ifversion, -ge, 22252, y)
98bd0e0d	174	ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) \|\| echo $(4))
598e2d33	175
ceec4c87 MY	176	######
	177
	178	###
	179	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
	180	# Usage:
	181	# $(Q)$(MAKE) $(build)=dir
176d0982	182	build := -f $(srctree)/scripts/Makefile.build obj
ceec4c87 MY	183
	184	###
	185	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
	186	# Usage:
	187	# $(Q)$(MAKE) $(modbuiltin)=dir
176d0982	188	modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
ceec4c87	189
98bd0e0d MY	190	###
	191	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
	192	# Usage:
	193	# $(Q)$(MAKE) $(dtbinst)=dir
	194	dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
	195
	196	###
	197	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
	198	# Usage:
	199	# $(Q)$(MAKE) $(clean)=dir
	200	clean := -f $(srctree)/scripts/Makefile.clean obj
	201
	202	###
	203	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
	204	# Usage:
	205	# $(Q)$(MAKE) $(hdr-inst)=dir
	206	hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
	207
ceec4c87 MY	208	# Prefix -I with $(srctree) if it is not an absolute path.
	209	# skip if -I has no parameter
	210	addtree = $(if $(patsubst -I%,%,$(1)), \
	211	$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
	212
	213	# Find all -I options and call addtree
	214	flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
	215
	216	# echo command.
	217	# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
	218	echo-cmd = $(if $($(quiet)cmd_$(1)),\
	219	echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
	220
	221	# printing commands
	222	cmd = @$(echo-cmd) $(cmd_$(1))
	223
	224	# Add $(obj)/ for paths that are not absolute
	225	objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
	226
	227	###
	228	# if_changed - execute command if any prerequisite is newer than
	229	# target, or command line has changed
	230	# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
	231	# including used config symbols
	232	# if_changed_rule - as if_changed but execute rule instead
	233	# See Documentation/kbuild/makefiles.txt for more info
	234
	235	ifneq ($(KBUILD_NOCMDDEP),1)
	236	# Check if both arguments has same arguments. Result is empty string if equal.
	237	# User may override this check using make KBUILD_NOCMDDEP=1
	238	arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
	239	$(filter-out $(cmd_$@), $(cmd_$(1))) )
	240	else
	241	arg-check = $(if $(strip $(cmd_$@)),,1)
	242	endif
	243
176d0982 MY	244	# Replace >$< with >$$< to preserve $ when reloading the .cmd file
176d0982 MY	245	# (needed for make)
e5e701c2	246	# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
176d0982 MY	247	# (needed for make)
	248	# Replace >'< with >'\''< to be able to enclose the whole string in '...'
	249	# (needed for the shell)
e5e701c2	250	make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
ceec4c87 MY	251
	252	# Find any prerequisites that is newer than target or that does not exist.
	253	# PHONY targets skipped in both cases.
	254	any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
	255
	256	# Execute command if command has changed or prerequisite(s) are updated.
	257	#
	258	if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
	259	@set -e; \
	260	$(echo-cmd) $(cmd_$(1)); \
176d0982	261	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
ceec4c87 MY	262
	263	# Execute the command and also postprocess generated .d dependencies file.
	264	if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
	265	@set -e; \
	266	$(echo-cmd) $(cmd_$(1)); \
	267	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
	268	rm -f $(depfile); \
	269	mv -f $(dot-target).tmp $(dot-target).cmd)
	270
	271	# Usage: $(call if_changed_rule,foo)
	272	# Will check if $(cmd_foo) or any of the prerequisites changed,
	273	# and if so will execute $(rule_foo).
	274	if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
	275	@set -e; \
	276	$(rule_$(1)))
	277
	278	###
	279	# why - tell why a a target got build
	280	# enabled by make V=2
	281	# Output (listed in the order they are checked):
	282	# (1) - due to target is PHONY
	283	# (2) - due to target missing
	284	# (3) - due to: file1.h file2.h
	285	# (4) - due to command line change
	286	# (5) - due to missing .cmd file
	287	# (6) - due to target not in $(targets)
	288	# (1) PHONY targets are always build
	289	# (2) No target, so we better build it
	290	# (3) Prerequisite is newer than target
	291	# (4) The command line stored in the file named dir/.target.cmd
	292	# differed from actual command line. This happens when compiler
	293	# options changes
	294	# (5) No dir/.target.cmd file (used to store command line)
	295	# (6) No dir/.target.cmd file and target not listed in $(targets)
	296	# This is a good hint that there is a bug in the kbuild file
	297	ifeq ($(KBUILD_VERBOSE),2)
	298	why = \
	299	$(if $(filter $@, $(PHONY)),- due to target is PHONY, \
	300	$(if $(wildcard $@), \
	301	$(if $(strip $(any-prereq)),- due to: $(any-prereq), \
	302	$(if $(arg-check), \
	303	$(if $(cmd_$@),- due to command line change, \
	304	$(if $(filter $@, $(targets)), \
	305	- due to missing .cmd file, \
	306	- due to $(notdir $@) not in $$(targets) \
	307	) \
	308	) \
	309	) \
	310	), \
	311	- due to target missing \
	312	) \
	313	)
	314
	315	echo-why = $(call escsq, $(strip $(why)))
	316	endif
04a5c406 MY	317
	318	ifdef CONFIG_SPL_BUILD
	319	SPL_ := SPL_
001f3142 SG	320	ifeq ($(CONFIG_TPL_BUILD),y)
	321	SPL_TPL_ := TPL_
	322	else
	323	SPL_TPL_ := SPL_
	324	endif
04a5c406 MY	325	else
04a5c406 MY	326	SPL_ :=
001f3142	327	SPL_TPL_ :=
04a5c406	328	endif