[mirror_ubuntu-hirsute-kernel.git] / scripts / Kbuild.include

# SPDX-License-Identifier: GPL-2.0
####
# 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 -MMD 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)

###
# Quote a string to pass it to C files. foo => '"foo"'
stringify = $(squote)$(quote)$1$(quote)$(squote)

###
# 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
define filechk
	$(Q)set -e;						\
	mkdir -p $(dir $@);					\
	trap "rm -f $(dot-target).tmp" EXIT;			\
	{ $(filechk_$(1)); } > $(dot-target).tmp;		\
	if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then	\
		$(kecho) '  UPD     $@';			\
		mv -f $(dot-target).tmp $@;			\
	fi
endef

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

# 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
#
# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
# would try to directly execute the shell builtin 'command'. This workaround
# should be kept for a long time since this issue was fixed only after the
# GNU Make 4.2.1 release.
cc-cross-prefix = $(firstword $(foreach c, $(1), \
			$(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))

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

# 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)/tmp.o;		\
	mkdir -p $(TMPOUT);		\
	trap "rm -rf $(TMPOUT)" EXIT;	\
	if ($(1)) >/dev/null 2>&1;	\
	then echo "$(2)";		\
	else echo "$(3)";		\
	fi)

# 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))

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

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

# cc-ifversion
# Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))

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

# 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.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

# 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))

###
# 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.rst for more info

ifneq ($(KBUILD_NOCMDDEP),1)
# Check if both commands are the same including their order. Result is empty
# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
                         $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
else
cmd-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 are newer than target or that do not exist.
# (This is not true for now; $? should contain any non-existent prerequisites,
# but it does not work as expected when .SECONDARY is present. This seems a bug
# of GNU Make.)
# PHONY targets skipped in both cases.
newer-prereqs = $(filter-out $(PHONY),$?)

# Execute command if command has changed or prerequisite(s) are updated.
if_changed = $(if $(newer-prereqs)$(cmd-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 $(newer-prereqs)$(cmd-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 $(newer-prereqs)$(cmd-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 $(newer-prereqs),- due to: $(newer-prereqs),                \
                $(if $(cmd-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
96ac6d43	1	# SPDX-License-Identifier: GPL-2.0
8ec4b4ff SR	2	####
	3	# kbuild: Generic definitions
	4
beda9f3a	5	# Convenient variables
8ec4b4ff	6	comma := ,
13338935	7	quote := "
d51bfb78	8	squote := '
8ec4b4ff SR	9	empty :=
8ec4b4ff SR	10	space := $(empty) $(empty)
9c8fa9bc	11	space_escape := _-_SPACE_-_
9564a8cf	12	pound := \#
8ec4b4ff	13
48f1f058 SR	14	###
	15	# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
	16	dot-target = $(dir $@).$(notdir $@)
	17
8ec4b4ff	18	###
30a77297	19	# The temporary file to save gcc -MMD generated dependencies must not
8ec4b4ff	20	# contain a comma
48f1f058	21	depfile = $(subst $(comma),_,$(dot-target).d)
8ec4b4ff	22
5e8d780d SR	23	###
	24	# filename of target with directory and extension stripped
	25	basetarget = $(basename $(notdir $@))
	26
afa974b7 MY	27	###
	28	# real prerequisites without phony targets
	29	real-prereqs = $(filter-out $(PHONY), $^)
	30
d51bfb78 SR	31	###
	32	# Escape single quote for use in echo statements
	33	escsq = $(subst $(squote),'\$(squote)',$1)
	34
7e826c44 MY	35	###
	36	# Quote a string to pass it to C files. foo => '"foo"'
	37	stringify = $(squote)$(quote)$1$(quote)$(squote)
	38
5410ecc0 MF	39	###
	40	# Easy method for doing a status message
	41	kecho := :
	42	quiet_kecho := echo
	43	silent_kecho := :
	44	kecho := $($(quiet)kecho)
	45
8ec4b4ff SR	46	###
	47	# filechk is used to check if the content of a generated file is updated.
	48	# Sample usage:
ba97df45 MY	49	#
	50	# filechk_sample = echo $(KERNELRELEASE)
	51	# version.h: FORCE
8ec4b4ff	52	# $(call filechk,sample)
ba97df45	53	#
8ec4b4ff SR	54	# The rule defined shall write to stdout the content of the new file.
	55	# The existing file will be compared with the new one.
	56	# - If no file exist it is created
	57	# - If the content differ the new file is used
	58	# - If they are equal no change, and no timestamp update
8ec4b4ff	59	define filechk
88fe89a4 MY	60	$(Q)set -e; \
	61	mkdir -p $(dir $@); \
	62	trap "rm -f $(dot-target).tmp" EXIT; \
	63	{ $(filechk_$(1)); } > $(dot-target).tmp; \
	64	if [ ! -r $@ ] \|\| ! cmp -s $@ $(dot-target).tmp; then \
	65	$(kecho) ' UPD $@'; \
	66	mv -f $(dot-target).tmp $@; \
8ec4b4ff SR	67	fi
	68	endef
	69
20a468b5	70	######
9d6e7a70	71	# gcc support functions
cd238eff	72	# See documentation in Documentation/kbuild/makefiles.rst
20a468b5	73
910b4046 SR	74	# cc-cross-prefix
910b4046 SR	75	# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
bd55f96f MY	76	# Return first <prefix> where a <prefix>gcc is found in PATH.
bd55f96f MY	77	# If no gcc found in PATH with listed prefixes return nothing
913ab978 MY	78	#
	79	# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
	80	# would try to directly execute the shell builtin 'command'. This workaround
	81	# should be kept for a long time since this issue was fixed only after the
	82	# GNU Make 4.2.1 release.
d4a74bbf MY	83	cc-cross-prefix = $(firstword $(foreach c, $(1), \
d4a74bbf MY	84	$(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
910b4046	85
beda9f3a	86	# output directory for tests below
f2f02ebd	87	TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
beda9f3a RZ	88
	89	# try-run
	90	# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
312a3d09 C	91	# Exit code chooses option. "$$TMP" serves as a temporary file and is
312a3d09 C	92	# automatically cleaned up.
e08d6de4	93	try-run = $(shell set -e; \
f2f02ebd MY	94	TMP=$(TMPOUT)/tmp; \
	95	TMPO=$(TMPOUT)/tmp.o; \
	96	mkdir -p $(TMPOUT); \
	97	trap "rm -rf $(TMPOUT)" EXIT; \
beda9f3a RZ	98	if ($(1)) >/dev/null 2>&1; \
	99	then echo "$(2)"; \
	100	else echo "$(3)"; \
f2f02ebd	101	fi)
347a00fb	102
20a468b5	103	# as-option
bff288c1	104	# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
beda9f3a	105
e08d6de4	106	as-option = $(call try-run,\
b1e0d8b7	107	$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
20a468b5	108
e2414910	109	# as-instr
bff288c1	110	# Usage: cflags-y += $(call as-instr,instr,option1,option2)
beda9f3a	111
e08d6de4	112	as-instr = $(call try-run,\
b1e0d8b7	113	printf "%b\n" "$(1)" \| $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
e2414910	114
9f3f1fd2 MK	115	# __cc-option
9f3f1fd2 MK	116	# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
e08d6de4	117	__cc-option = $(call try-run,\
9f3f1fd2 MK	118	$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
9f3f1fd2 MK	119
20a468b5	120	# cc-option
bff288c1	121	# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
beda9f3a	122
9f3f1fd2	123	cc-option = $(call __cc-option, $(CC),\
132305b3	124	$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
9f3f1fd2	125
20a468b5	126	# cc-option-yn
bff288c1	127	# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
e08d6de4	128	cc-option-yn = $(call try-run,\
132305b3	129	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
20a468b5	130
8417da6f MM	131	# cc-disable-warning
8417da6f MM	132	# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
e08d6de4	133	cc-disable-warning = $(call try-run,\
132305b3	134	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
8417da6f	135
20a468b5 SR	136	# cc-ifversion
20a468b5 SR	137	# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
d3a918c6	138	cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) \|\| echo $(4))
20a468b5	139
691ef3e7	140	# ld-option
d503ac53 MY	141	# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
d503ac53 MY	142	ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
691ef3e7	143
ccbef167	144	# ld-version
ccbef167	145	# Note this is mainly for HJ Lu's 3 number binutil versions
e08d6de4	146	ld-version = $(shell $(LD) --version \| $(srctree)/scripts/ld-version.sh)
ccbef167 AK	147
	148	# ld-ifversion
	149	# Usage: $(call ld-ifversion, -ge, 22252, y)
6dcb4e5e	150	ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) \|\| echo $(4))
ccbef167	151
5de043f4	152	######
0b0bf7a3	153
beda9f3a	154	###
8ec4b4ff SR	155	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
	156	# Usage:
	157	# $(Q)$(MAKE) $(build)=dir
5b2389b4	158	build := -f $(srctree)/scripts/Makefile.build obj
8ec4b4ff	159
9fb5e537 RR	160	###
	161	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
	162	# Usage:
	163	# $(Q)$(MAKE) $(dtbinst)=dir
487c7c77	164	dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
9fb5e537	165
371fdc77 MY	166	###
	167	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
	168	# Usage:
	169	# $(Q)$(MAKE) $(clean)=dir
	170	clean := -f $(srctree)/scripts/Makefile.clean obj
	171
5de043f4 OV	172	# echo command.
5de043f4 OV	173	# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
bff288c1	174	echo-cmd = $(if $($(quiet)cmd_$(1)),\
5de043f4 OV	175	echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
	176
	177	# printing commands
3a2429e1	178	cmd = @set -e; $(echo-cmd) $(cmd_$(1))
8ec4b4ff SR	179
8ec4b4ff SR	180	###
5de043f4	181	# if_changed - execute command if any prerequisite is newer than
8ec4b4ff SR	182	# target, or command line has changed
	183	# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
	184	# including used config symbols
	185	# if_changed_rule - as if_changed but execute rule instead
cd238eff	186	# See Documentation/kbuild/makefiles.rst for more info
8ec4b4ff SR	187
8ec4b4ff SR	188	ifneq ($(KBUILD_NOCMDDEP),1)
50bcca6a	189	# Check if both commands are the same including their order. Result is empty
9c8fa9bc	190	# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
50bcca6a	191	cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
9c8fa9bc	192	$(subst $(space),$(space_escape),$(strip $(cmd_$1))))
c4d5ee13	193	else
50bcca6a	194	cmd-check = $(if $(strip $(cmd_$@)),,1)
8ec4b4ff SR	195	endif
8ec4b4ff SR	196
164f0d2e MM	197	# Replace >$< with >$$< to preserve $ when reloading the .cmd file
164f0d2e MM	198	# (needed for make)
9564a8cf	199	# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
164f0d2e MM	200	# (needed for make)
	201	# Replace >'< with >'\''< to be able to enclose the whole string in '...'
	202	# (needed for the shell)
9564a8cf	203	make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
6176aa9a	204
2d3b1b8f MY	205	# Find any prerequisites that are newer than target or that do not exist.
	206	# (This is not true for now; $? should contain any non-existent prerequisites,
	207	# but it does not work as expected when .SECONDARY is present. This seems a bug
	208	# of GNU Make.)
48f1f058	209	# PHONY targets skipped in both cases.
eba19032	210	newer-prereqs = $(filter-out $(PHONY),$?)
48f1f058	211
5de043f4	212	# Execute command if command has changed or prerequisite(s) are updated.
eba19032	213	if_changed = $(if $(newer-prereqs)$(cmd-check), \
67126965	214	$(cmd); \
2aedcd09	215	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
8ec4b4ff	216
5de043f4	217	# Execute the command and also postprocess generated .d dependencies file.
eba19032	218	if_changed_dep = $(if $(newer-prereqs)$(cmd-check),$(cmd_and_fixdep),@:)
c1a95fda	219
e4aca459	220	cmd_and_fixdep = \
3a2429e1	221	$(cmd); \
392885ee	222	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
e5d28910	223	rm -f $(depfile)
c1a95fda	224
8ec4b4ff	225	# Usage: $(call if_changed_rule,foo)
beda9f3a RZ	226	# Will check if $(cmd_foo) or any of the prerequisites changed,
beda9f3a RZ	227	# and if so will execute $(rule_foo).
eba19032	228	if_changed_rule = $(if $(newer-prereqs)$(cmd-check),$(rule_$(1)),@:)
48f1f058	229
45d506bd	230	###
312a3d09	231	# why - tell why a target got built
45d506bd SR	232	# enabled by make V=2
	233	# Output (listed in the order they are checked):
	234	# (1) - due to target is PHONY
	235	# (2) - due to target missing
	236	# (3) - due to: file1.h file2.h
	237	# (4) - due to command line change
	238	# (5) - due to missing .cmd file
	239	# (6) - due to target not in $(targets)
	240	# (1) PHONY targets are always build
	241	# (2) No target, so we better build it
	242	# (3) Prerequisite is newer than target
	243	# (4) The command line stored in the file named dir/.target.cmd
	244	# differed from actual command line. This happens when compiler
	245	# options changes
	246	# (5) No dir/.target.cmd file (used to store command line)
	247	# (6) No dir/.target.cmd file and target not listed in $(targets)
	248	# This is a good hint that there is a bug in the kbuild file
	249	ifeq ($(KBUILD_VERBOSE),2)
	250	why = \
	251	$(if $(filter $@, $(PHONY)),- due to target is PHONY, \
	252	$(if $(wildcard $@), \
eba19032	253	$(if $(newer-prereqs),- due to: $(newer-prereqs), \
50bcca6a	254	$(if $(cmd-check), \
45d506bd SR	255	$(if $(cmd_$@),- due to command line change, \
	256	$(if $(filter $@, $(targets)), \
	257	- due to missing .cmd file, \
	258	- due to $(notdir $@) not in $$(targets) \
	259	) \
	260	) \
	261	) \
	262	), \
	263	- due to target missing \
	264	) \
	265	)
	266
	267	echo-why = $(call escsq, $(strip $(why)))
	268	endif
3ee550f1 DW	269
	270	###############################################################################
	271	#
	272	# When a Kconfig string contains a filename, it is suitable for
	273	# passing to shell commands. It is surrounded by double-quotes, and
	274	# any double-quotes or backslashes within it are escaped by
	275	# backslashes.
	276	#
	277	# This is no use for dependencies or $(wildcard). We need to strip the
	278	# surrounding quotes and the escaping from quotes and backslashes, and
	279	# we do need to escape any spaces in the string. So, for example:
	280	#
	281	# Usage: $(eval $(call config_filename,FOO))
	282	#
	283	# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
	284	# transformed as described above to be suitable for use within the
	285	# makefile.
	286	#
	287	# Also, if the filename is a relative filename and exists in the source
	288	# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
	289	# be prefixed to both command invocation and dependencies.
	290	#
	291	# Note: We also print the filenames in the quiet_cmd_foo text, and
	292	# perhaps ought to have a version specially escaped for that purpose.
	293	# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
	294	# enough. It'll strip the quotes in the common case where there's no
	295	# space and it's a simple filename, and it'll retain the quotes when
	296	# there's a space. There are some esoteric cases in which it'll print
	297	# the wrong thing, but we don't really care. The actual dependencies
	298	# and commands do get it right, with various combinations of single
	299	# and double quotes, backslashes and spaces in the filenames.
	300	#
	301	###############################################################################
	302	#
3ee550f1 DW	303	define config_filename
	304	ifneq ($$(CONFIG_$(1)),"")
	305	$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
	306	ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
	307	else
	308	ifeq ($$(wildcard $$($(1)_FILENAME)),)
	309	ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
	310	$(1)_SRCPREFIX := $(srctree)/
	311	endif
	312	endif
	313	endif
	314	endif
	315	endef
	316	#
	317	###############################################################################
9c2af1c7 MY	318
	319	# delete partially updated (i.e. corrupted) files on error
	320	.DELETE_ON_ERROR:
8e9b61b2 MY	321
	322	# do not delete intermediate files automatically
	323	.SECONDARY: