[GitHub/mt8127/android_kernel_alcatel_ttab.git] / scripts / Kbuild.include

####
# kbuild: Generic definitions

# Convinient variables
comma   := ,
squote  := '
empty   :=
space   := $(empty) $(empty)

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

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

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

###
# 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;				\
	echo '  CHK     $@';			\
	mkdir -p $(dir $@);			\
	$(filechk_$(1)) < $< > $@.tmp;		\
	if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
		rm -f $@.tmp;			\
	else					\
		echo '  UPD     $@';		\
		mv -f $@.tmp $@;		\
	fi
endef

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

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

as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
	     -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
	     else echo "$(2)"; fi ;)

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

cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
             > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)

# cc-option-yn
# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
                > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)

# 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-version
# Usage gcc-ver := $(call cc-version, $(CC))
cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
              $(if $(1), $(1), $(CC)))

# cc-ifversion
# Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
                       echo $(3); fi;)

# ld-option
# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
ld-option = $(shell if $(CC) $(1) \
			     -nostdlib -o ldtest$$$$.out -xc /dev/null \
             > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi; \
	     rm -f ldtest$$$$.out)

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

# Prefix -I with $(srctree) if it is not an absolute path
addtree = $(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)))

# If quiet is set, only print short version of command
cmd = @$(echo-cmd) $(cmd_$(1))

# Add $(obj)/ for paths that is 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 in empty string if equal
# User may override this check using make KBUILD_NOCMDDEP=1
arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) )
endif

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

make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))

# function to only execute the passed command if necessary
# >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file
# note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars
#
if_changed = $(if $(strip $(filter-out $(PHONY),$?)          \
		$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
	@set -e; \
	$(echo-cmd) $(cmd_$(1)); \
	echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)

# execute the command and also postprocess generated .d dependencies
# file
if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?)  \
		$(filter-out FORCE $(wildcard $^),$^)    \
	$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),     \
	@set -e; \
	$(echo-cmd) $(cmd_$(1)); \
	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
	rm -f $(depfile); \
	mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)

# Usage: $(call if_changed_rule,foo)
# will check if $(cmd_foo) changed, or any of the prequisites changed,
# and if so will execute $(rule_foo)
if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?)            \
			$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
			@set -e; \
			$(rule_$(1)))
Commit	Line	Data
8ec4b4ff SR	1	####
	2	# kbuild: Generic definitions
	3
	4	# Convinient variables
	5	comma := ,
d51bfb78	6	squote := '
8ec4b4ff SR	7	empty :=
	8	space := $(empty) $(empty)
	9
	10	###
	11	# The temporary file to save gcc -MD generated dependencies must not
	12	# contain a comma
	13	depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
	14
5e8d780d SR	15	###
	16	# filename of target with directory and extension stripped
	17	basetarget = $(basename $(notdir $@))
	18
d51bfb78 SR	19	###
	20	# Escape single quote for use in echo statements
	21	escsq = $(subst $(squote),'\$(squote)',$1)
	22
8ec4b4ff SR	23	###
	24	# filechk is used to check if the content of a generated file is updated.
	25	# Sample usage:
	26	# define filechk_sample
	27	# echo $KERNELRELEASE
	28	# endef
	29	# version.h : Makefile
	30	# $(call filechk,sample)
	31	# The rule defined shall write to stdout the content of the new file.
	32	# The existing file will be compared with the new one.
	33	# - If no file exist it is created
	34	# - If the content differ the new file is used
	35	# - If they are equal no change, and no timestamp update
	36	# - stdin is piped in from the first prerequisite ($<) so one has
	37	# to specify a valid file as first prerequisite (often the kbuild file)
	38	define filechk
	39	$(Q)set -e; \
	40	echo ' CHK $@'; \
	41	mkdir -p $(dir $@); \
	42	$(filechk_$(1)) < $< > $@.tmp; \
	43	if [ -r $@ ] && cmp -s $@ $@.tmp; then \
	44	rm -f $@.tmp; \
	45	else \
	46	echo ' UPD $@'; \
	47	mv -f $@.tmp $@; \
	48	fi
	49	endef
	50
20a468b5	51	######
9d6e7a70	52	# gcc support functions
20a468b5 SR	53	# See documentation in Documentation/kbuild/makefiles.txt
	54
	55	# as-option
	56	# Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
	57
	58	as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
	59	-xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
	60	else echo "$(2)"; fi ;)
	61
	62	# cc-option
	63	# Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
	64
	65	cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
	66	> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
	67
	68	# cc-option-yn
	69	# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
	70	cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
	71	> /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
	72
	73	# cc-option-align
	74	# Prefix align with either -falign or -malign
	75	cc-option-align = $(subst -functions=0,,\
	76	$(call cc-option,-falign-functions=0,-malign-functions=0))
	77
	78	# cc-version
	79	# Usage gcc-ver := $(call cc-version, $(CC))
	80	cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
	81	$(if $(1), $(1), $(CC)))
	82
	83	# cc-ifversion
	84	# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
	85	cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
	86	echo $(3); fi;)
	87
0b0bf7a3 RM	88	# ld-option
	89	# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
	90	ld-option = $(shell if $(CC) $(1) \
	91	-nostdlib -o ldtest$$$$.out -xc /dev/null \
	92	> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi; \
	93	rm -f ldtest$$$$.out)
	94
8ec4b4ff SR	95	###
	96	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
	97	# Usage:
	98	# $(Q)$(MAKE) $(build)=dir
	99	build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
	100
d9df92e2 SR	101	# Prefix -I with $(srctree) if it is not an absolute path
	102	addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
	103	# Find all -I options and call addtree
	104	flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
	105
8ec4b4ff	106	# If quiet is set, only print short version of command
6176aa9a	107	cmd = @$(echo-cmd) $(cmd_$(1))
8ec4b4ff	108
0a504f25 SR	109	# Add $(obj)/ for paths that is not absolute
	110	objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
	111
8ec4b4ff SR	112	###
	113	# if_changed - execute command if any prerequisite is newer than
	114	# target, or command line has changed
	115	# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
	116	# including used config symbols
	117	# if_changed_rule - as if_changed but execute rule instead
	118	# See Documentation/kbuild/makefiles.txt for more info
	119
	120	ifneq ($(KBUILD_NOCMDDEP),1)
	121	# Check if both arguments has same arguments. Result in empty string if equal
	122	# User may override this check using make KBUILD_NOCMDDEP=1
	123	arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) )
	124	endif
	125
	126	# echo command. Short version is $(quiet) equals quiet, otherwise full command
	127	echo-cmd = $(if $($(quiet)cmd_$(1)), \
d51bfb78	128	echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
8ec4b4ff	129
6176aa9a JB	130	make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
6176aa9a JB	131
8ec4b4ff SR	132	# function to only execute the passed command if necessary
	133	# >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file
	134	# note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars
4f193362 PS	135	#
	136	if_changed = $(if $(strip $(filter-out $(PHONY),$?) \
	137	$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
8ec4b4ff	138	@set -e; \
6176aa9a JB	139	$(echo-cmd) $(cmd_$(1)); \
6176aa9a JB	140	echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)
8ec4b4ff SR	141
	142	# execute the command and also postprocess generated .d dependencies
	143	# file
4f193362 PS	144	if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \
	145	$(filter-out FORCE $(wildcard $^),$^) \
	146	$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
8ec4b4ff	147	@set -e; \
6176aa9a JB	148	$(echo-cmd) $(cmd_$(1)); \
6176aa9a JB	149	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
8ec4b4ff SR	150	rm -f $(depfile); \
	151	mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
	152
	153	# Usage: $(call if_changed_rule,foo)
	154	# will check if $(cmd_foo) changed, or any of the prequisites changed,
	155	# and if so will execute $(rule_foo)
4f193362 PS	156	if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \
4f193362 PS	157	$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
8ec4b4ff SR	158	@set -e; \
8ec4b4ff SR	159	$(rule_$(1)))