rules.mak - qemu-android - Git at Google


 # Don't use implicit rules or variables
 # we have explicit rules for everything
 MAKEFLAGS += -rR

 # Files with this suffixes are final, don't try to generate them
 # using implicit rules
 %.d:
 %.h:
 %.c:
 %.cc:
 %.cpp:
 %.m:
 %.mak:

 # Flags for C++ compilation
 QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))

 # Flags for dependency generation
 QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(*D)/$(*F).d

 # Same as -I$(SRC_PATH) -I., but for the nested source/object directories
 QEMU_INCLUDES += -I$(<D) -I$(@D)

 maybe-add = $(filter-out $1, $2) $1
 extract-libs = $(strip $(sort $(foreach o,$1,$($o-libs))) \
                   $(foreach o,$(call expand-objs,$1),$($o-libs)))
 expand-objs = $(strip $(sort $(filter %.o,$1)) \
                   $(foreach o,$(filter %.mo,$1),$($o-objs)) \
                   $(filter-out %.o %.mo,$1))

 %.o: %.c
 	$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  CC    $(TARGET_DIR)$@")
 %.o: %.rc
 	$(call quiet-command,$(WINDRES) -I. -o $@ $<,"  RC    $(TARGET_DIR)$@")

 # If we have a CXX we might have some C++ objects, in which case we
 # must link with the C++ compiler, not the plain C compiler.
 LINKPROG = $(or $(CXX),$(CC))

 ifeq ($(LIBTOOL),)
 LINK = $(call quiet-command,$(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
        $(call expand-objs,$1) $(version-obj-y) \
        $(call extract-libs,$1) $(LIBS),"  LINK  $(TARGET_DIR)$@")
 else
 LIBTOOL += $(if $(V),,--quiet)
 %.lo: %.c
 	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC $(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($*.o-cflags) -c -o $@ $<,"  lt CC $@")
 %.lo: %.rc
 	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=RC $(WINDRES) -I. -o $@ $<,"lt RC   $(TARGET_DIR)$@")
 %.lo: %.dtrace
 	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, " lt GEN $(TARGET_DIR)$@")

 LINK = $(call quiet-command,\
        $(if $(filter %.lo %.la,$1),$(LIBTOOL) --mode=link --tag=CC \
        )$(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
        $(call expand-objs,$1) \
        $(if $(filter %.lo %.la,$1),$(version-lobj-y),$(version-obj-y)) \
        $(if $(filter %.lo %.la,$1),$(LIBTOOLFLAGS)) \
        $(call extract-libs,$(1:.lo=.o)) $(LIBS),$(if $(filter %.lo %.la,$1),"lt LINK ", "  LINK  ")"$(TARGET_DIR)$@")
 endif

 %.asm: %.S
 	$(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -o $@ $<,"  CPP   $(TARGET_DIR)$@")

 %.o: %.asm
 	$(call quiet-command,$(AS) $(ASFLAGS) -o $@ $<,"  AS    $(TARGET_DIR)$@")

 %.o: %.cc
 	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  CXX   $(TARGET_DIR)$@")

 %.o: %.cpp
 	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  CXX   $(TARGET_DIR)$@")

 %.o: %.m
 	$(call quiet-command,$(OBJCC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  OBJC  $(TARGET_DIR)$@")

 %.o: %.dtrace
 	$(call quiet-command,dtrace -o $@ -G -s $<, "  GEN   $(TARGET_DIR)$@")

 DSO_CFLAGS := -fPIC -DBUILD_DSO
 %$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
 %$(DSOSUF): %.mo libqemustub.a
 	$(call LINK,$^)
 	@# Copy to build root so modules can be loaded when program started without install
 	$(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@), "  CP    $(subst /,-,$@)"))

 .PHONY: modules
 modules:

 %$(EXESUF): %.o
 	$(call LINK,$^)

 %.a:
 	$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"  AR    $(TARGET_DIR)$@")

 quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))

 # cc-option
 # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)

 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
               >/dev/null 2>&1 && echo OK), $2, $3)

 VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))

 # find-in-path
 # Usage: $(call find-in-path, prog)
 # Looks in the PATH if the argument contains no slash, else only considers one
 # specific directory.  Returns an # empty string if the program doesn't exist
 # there.
 find-in-path = $(if $(find-string /, $1), \
         $(wildcard $1), \
         $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))

 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
 # Inputs to these must be either "y" (true) or "n" or "" (both false)
 # Output is always either "y" or "n".
 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
 # Logical NOT
 lnot = $(if $(subst n,,$1),n,y)
 # Logical AND
 land = $(if $(findstring yy,$1$2),y,n)
 # Logical OR
 lor = $(if $(findstring y,$1$2),y,n)
 # Logical XOR (note that this is the inverse of leqv)
 lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 # Logical equivalence (note that leqv "","n" is true)
 leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 # Logical if: like make's $(if) but with an leqv-like test
 lif = $(if $(subst n,,$1),$2,$3)

 # String testing functions: inputs to these can be any string;
 # the output is always either "y" or "n". Leading and trailing whitespace
 # is ignored when comparing strings.
 # String equality
 eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 # String inequality
 ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 # Emptiness/non-emptiness tests:
 isempty = $(if $1,n,y)
 notempty = $(if $1,y,n)

 # Generate files with tracetool
 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py

 # Generate timestamp files for .h include files

 config-%.h: config-%.h-timestamp
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@

 config-%.h-timestamp: config-%.mak
 	$(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, "  GEN   $(TARGET_DIR)config-$*.h")

 .PHONY: clean-timestamp
 clean-timestamp:
 	rm -f *.timestamp
 clean: clean-timestamp

 # will delete the target of a rule if commands exit with a nonzero exit status
 .DELETE_ON_ERROR:

 # magic to descend into other directories

 define push-var
 $(eval save-$2-$1 = $(value $1))
 $(eval $1 :=)
 endef

 define pop-var
 $(eval subdir-$2-$1 := $(if $(filter $2,$(save-$2-$1)),$(addprefix $2,$($1))))
 $(eval $1 = $(value save-$2-$1) $$(subdir-$2-$1))
 $(eval save-$2-$1 :=)
 endef

 define fix-obj-vars
 $(if $2, $(foreach v,$($1), \
 	$(if $($v-cflags), \
 		$(eval $2/$v-cflags := $($v-cflags)) \
 		$(eval $v-cflags := )) \
 	$(if $($v-libs), \
 		$(eval $2/$v-libs := $($v-libs)) \
 		$(eval $v-libs := )) \
 	$(if $($v-objs), \
 		$(eval $2/$v-objs := $(addprefix $2/,$($v-objs))) \
 		$(eval $v-objs := ))))
 endef

 define unnest-dir
 $(foreach var,$(nested-vars),$(call push-var,$(var),$1/))
 $(eval obj-parent-$1 := $(obj))
 $(eval obj := $(if $(obj),$(obj)/$1,$1))
 $(eval include $(SRC_PATH)/$1/Makefile.objs)
 $(foreach v,$(nested-vars),$(call fix-obj-vars,$v,$(obj)))
 $(eval obj := $(obj-parent-$1))
 $(eval obj-parent-$1 := )
 $(foreach var,$(nested-vars),$(call pop-var,$(var),$1/))
 endef

 define unnest-vars-1
 $(eval nested-dirs := $(filter-out \
     $(old-nested-dirs), \
     $(sort $(foreach var,$(nested-vars), $(filter %/, $($(var)))))))
 $(if $(nested-dirs),
   $(foreach dir,$(nested-dirs),$(call unnest-dir,$(patsubst %/,%,$(dir))))
   $(eval old-nested-dirs := $(old-nested-dirs) $(nested-dirs))
   $(call unnest-vars-1))
 endef

 define process-modules
 $(foreach o,$(filter %.o,$($1)),
 	$(eval $(patsubst %.o,%.mo,$o): $o) \
 	$(eval $(patsubst %.o,%.mo,$o)-objs := $o))
 $(foreach o,$(filter-out $(modules-m), $(patsubst %.o,%.mo,$($1))), \
     $(eval $o-objs += module-common.o)
     $(eval $o: $($o-objs))
     $(eval modules-objs-m += $($o-objs))
     $(eval modules-m += $o)
     $(eval $o:; $$(call quiet-command,touch $$@,"  GEN   $$(TARGET_DIR)$$@"))
     $(if $(CONFIG_MODULES),$(eval modules: $(patsubst %.mo,%$(DSOSUF),$o)))) \
 $(eval modules-objs-m := $(sort $(modules-objs-m)))
 $(foreach o,$(modules-objs-m), \
     $(if $(CONFIG_MODULES),$(eval $o-cflags := $(call maybe-add, $(DSO_CFLAGS), $($o-cflags)))))
 $(eval $(patsubst %-m,%-$(call lnot,$(CONFIG_MODULES)),$1) += $($1))
 endef

 define unnest-vars
 $(eval obj := $1)
 $(eval nested-vars := $2)
 $(foreach v,$(nested-vars),$(call fix-obj-vars,$v,$(obj)))
 $(eval old-nested-dirs := )
 $(call unnest-vars-1)
 $(if $1,$(foreach v,$(nested-vars),$(eval \
 	$v := $(addprefix $1/,$($v)))))
 $(foreach var,$(nested-vars),$(eval $(var) := $(filter-out %/, $($(var)))))
 $(shell mkdir -p $(sort $(foreach var,$(nested-vars),$(dir $($(var))))))
 $(foreach var,$(nested-vars), $(eval \
   -include $(addsuffix *.d, $(sort $(dir $($(var)))))))
 $(foreach v,$(filter %-m,$(nested-vars)), \
     $(call process-modules,$v))
 endef

	# Don't use implicit rules or variables
	# we have explicit rules for everything
	MAKEFLAGS += -rR

	# Files with this suffixes are final, don't try to generate them
	# using implicit rules
	%.d:
	%.h:
	%.c:
	%.cc:
	%.cpp:
	%.m:
	%.mak:

	# Flags for C++ compilation
	QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))

	# Flags for dependency generation
	QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(D)/$(F).d

	# Same as -I$(SRC_PATH) -I., but for the nested source/object directories
	QEMU_INCLUDES += -I$(<D) -I$(@D)

	maybe-add = $(filter-out $1, $2) $1
	extract-libs = $(strip $(sort $(foreach o,$1,$($o-libs))) \
	$(foreach o,$(call expand-objs,$1),$($o-libs)))
	expand-objs = $(strip $(sort $(filter %.o,$1)) \
	$(foreach o,$(filter %.mo,$1),$($o-objs)) \
	$(filter-out %.o %.mo,$1))

	%.o: %.c
	$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CC $(TARGET_DIR)$@")
	%.o: %.rc
	$(call quiet-command,$(WINDRES) -I. -o $@ $<," RC $(TARGET_DIR)$@")

	# If we have a CXX we might have some C++ objects, in which case we
	# must link with the C++ compiler, not the plain C compiler.
	LINKPROG = $(or $(CXX),$(CC))

	ifeq ($(LIBTOOL),)
	LINK = $(call quiet-command,$(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
	$(call expand-objs,$1) $(version-obj-y) \
	$(call extract-libs,$1) $(LIBS)," LINK $(TARGET_DIR)$@")
	else
	LIBTOOL += $(if $(V),,--quiet)
	%.lo: %.c
	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC $(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($*.o-cflags) -c -o $@ $<," lt CC $@")
	%.lo: %.rc
	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=RC $(WINDRES) -I. -o $@ $<,"lt RC $(TARGET_DIR)$@")
	%.lo: %.dtrace
	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, " lt GEN $(TARGET_DIR)$@")

	LINK = $(call quiet-command,\
	$(if $(filter %.lo %.la,$1),$(LIBTOOL) --mode=link --tag=CC \
	)$(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
	$(call expand-objs,$1) \
	$(if $(filter %.lo %.la,$1),$(version-lobj-y),$(version-obj-y)) \
	$(if $(filter %.lo %.la,$1),$(LIBTOOLFLAGS)) \
	$(call extract-libs,$(1:.lo=.o)) $(LIBS),$(if $(filter %.lo %.la,$1),"lt LINK ", " LINK ")"$(TARGET_DIR)$@")
	endif

	%.asm: %.S
	$(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -o $@ $<," CPP $(TARGET_DIR)$@")

	%.o: %.asm
	$(call quiet-command,$(AS) $(ASFLAGS) -o $@ $<," AS $(TARGET_DIR)$@")

	%.o: %.cc
	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CXX $(TARGET_DIR)$@")

	%.o: %.cpp
	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CXX $(TARGET_DIR)$@")

	%.o: %.m
	$(call quiet-command,$(OBJCC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," OBJC $(TARGET_DIR)$@")

	%.o: %.dtrace
	$(call quiet-command,dtrace -o $@ -G -s $<, " GEN $(TARGET_DIR)$@")

	DSO_CFLAGS := -fPIC -DBUILD_DSO
	%$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
	%$(DSOSUF): %.mo libqemustub.a
	$(call LINK,$^)
	@# Copy to build root so modules can be loaded when program started without install
	$(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@), " CP $(subst /,-,$@)"))

	.PHONY: modules
	modules:

	%$(EXESUF): %.o
	$(call LINK,$^)

	%.a:
	$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^," AR $(TARGET_DIR)$@")

	quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))

	# cc-option
	# Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)

	cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
	>/dev/null 2>&1 && echo OK), $2, $3)

	VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
	set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))

	# find-in-path
	# Usage: $(call find-in-path, prog)
	# Looks in the PATH if the argument contains no slash, else only considers one
	# specific directory. Returns an # empty string if the program doesn't exist
	# there.
	find-in-path = $(if $(find-string /, $1), \
	$(wildcard $1), \
	$(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))

	# Logical functions (for operating on y/n values like CONFIG_FOO vars)
	# Inputs to these must be either "y" (true) or "n" or "" (both false)
	# Output is always either "y" or "n".
	# Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
	# Logical NOT
	lnot = $(if $(subst n,,$1),n,y)
	# Logical AND
	land = $(if $(findstring yy,$1$2),y,n)
	# Logical OR
	lor = $(if $(findstring y,$1$2),y,n)
	# Logical XOR (note that this is the inverse of leqv)
	lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
	# Logical equivalence (note that leqv "","n" is true)
	leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
	# Logical if: like make's $(if) but with an leqv-like test
	lif = $(if $(subst n,,$1),$2,$3)

	# String testing functions: inputs to these can be any string;
	# the output is always either "y" or "n". Leading and trailing whitespace
	# is ignored when comparing strings.
	# String equality
	eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
	# String inequality
	ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
	# Emptiness/non-emptiness tests:
	isempty = $(if $1,n,y)
	notempty = $(if $1,y,n)

	# Generate files with tracetool
	TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py

	# Generate timestamp files for .h include files

	config-%.h: config-%.h-timestamp
	@cmp $< $@ >/dev/null 2>&1 \|\| cp $< $@

	config-%.h-timestamp: config-%.mak
	$(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, " GEN $(TARGET_DIR)config-$*.h")

	.PHONY: clean-timestamp
	clean-timestamp:
	rm -f *.timestamp
	clean: clean-timestamp

	# will delete the target of a rule if commands exit with a nonzero exit status
	.DELETE_ON_ERROR:

	# magic to descend into other directories

	define push-var
	$(eval save-$2-$1 = $(value $1))
	$(eval $1 :=)
	endef

	define pop-var
	$(eval subdir-$2-$1 := $(if $(filter $2,$(save-$2-$1)),$(addprefix $2,$($1))))
	$(eval $1 = $(value save-$2-$1) $$(subdir-$2-$1))
	$(eval save-$2-$1 :=)
	endef

	define fix-obj-vars
	$(if $2, $(foreach v,$($1), \
	$(if $($v-cflags), \
	$(eval $2/$v-cflags := $($v-cflags)) \
	$(eval $v-cflags := )) \
	$(if $($v-libs), \
	$(eval $2/$v-libs := $($v-libs)) \
	$(eval $v-libs := )) \
	$(if $($v-objs), \
	$(eval $2/$v-objs := $(addprefix $2/,$($v-objs))) \
	$(eval $v-objs := ))))
	endef

	define unnest-dir
	$(foreach var,$(nested-vars),$(call push-var,$(var),$1/))
	$(eval obj-parent-$1 := $(obj))
	$(eval obj := $(if $(obj),$(obj)/$1,$1))
	$(eval include $(SRC_PATH)/$1/Makefile.objs)
	$(foreach v,$(nested-vars),$(call fix-obj-vars,$v,$(obj)))
	$(eval obj := $(obj-parent-$1))
	$(eval obj-parent-$1 := )
	$(foreach var,$(nested-vars),$(call pop-var,$(var),$1/))
	endef

	define unnest-vars-1
	$(eval nested-dirs := $(filter-out \
	$(old-nested-dirs), \
	$(sort $(foreach var,$(nested-vars), $(filter %/, $($(var)))))))
	$(if $(nested-dirs),
	$(foreach dir,$(nested-dirs),$(call unnest-dir,$(patsubst %/,%,$(dir))))
	$(eval old-nested-dirs := $(old-nested-dirs) $(nested-dirs))
	$(call unnest-vars-1))
	endef

	define process-modules
	$(foreach o,$(filter %.o,$($1)),
	$(eval $(patsubst %.o,%.mo,$o): $o) \
	$(eval $(patsubst %.o,%.mo,$o)-objs := $o))
	$(foreach o,$(filter-out $(modules-m), $(patsubst %.o,%.mo,$($1))), \
	$(eval $o-objs += module-common.o)
	$(eval $o: $($o-objs))
	$(eval modules-objs-m += $($o-objs))
	$(eval modules-m += $o)
	$(eval $o:; $$(call quiet-command,touch $$@," GEN $$(TARGET_DIR)$$@"))
	$(if $(CONFIG_MODULES),$(eval modules: $(patsubst %.mo,%$(DSOSUF),$o)))) \
	$(eval modules-objs-m := $(sort $(modules-objs-m)))
	$(foreach o,$(modules-objs-m), \
	$(if $(CONFIG_MODULES),$(eval $o-cflags := $(call maybe-add, $(DSO_CFLAGS), $($o-cflags)))))
	$(eval $(patsubst %-m,%-$(call lnot,$(CONFIG_MODULES)),$1) += $($1))
	endef

	define unnest-vars
	$(eval obj := $1)
	$(eval nested-vars := $2)
	$(foreach v,$(nested-vars),$(call fix-obj-vars,$v,$(obj)))
	$(eval old-nested-dirs := )
	$(call unnest-vars-1)
	$(if $1,$(foreach v,$(nested-vars),$(eval \
	$v := $(addprefix $1/,$($v)))))
	$(foreach var,$(nested-vars),$(eval $(var) := $(filter-out %/, $($(var)))))
	$(shell mkdir -p $(sort $(foreach var,$(nested-vars),$(dir $($(var))))))
	$(foreach var,$(nested-vars), $(eval \
	-include $(addsuffix *.d, $(sort $(dir $($(var)))))))
	$(foreach v,$(filter %-m,$(nested-vars)), \
	$(call process-modules,$v))
	endef