Rules.make - pub/scm/linux/kernel/git/wtarreau/linux-2.4 - Git at Google

 #
 # This file contains rules which are shared between multiple Makefiles.
 #

 #
 # False targets.
 #
 .PHONY: dummy

 #
 # Special variables which should not be exported
 #
 unexport EXTRA_AFLAGS
 unexport EXTRA_CFLAGS
 unexport EXTRA_LDFLAGS
 unexport EXTRA_ARFLAGS
 unexport SUBDIRS
 unexport SUB_DIRS
 unexport ALL_SUB_DIRS
 unexport MOD_SUB_DIRS
 unexport O_TARGET
 unexport ALL_MOBJS

 unexport obj-y
 unexport obj-m
 unexport obj-n
 unexport obj-
 unexport export-objs
 unexport subdir-y
 unexport subdir-m
 unexport subdir-n
 unexport subdir-

 comma	:= ,
 EXTRA_CFLAGS_nostdinc := $(EXTRA_CFLAGS) $(kbuild_2_4_nostdinc)

 #
 # Get things started.
 #
 first_rule: sub_dirs
 	$(MAKE) all_targets

 both-m          := $(filter $(mod-subdirs), $(subdir-y))
 SUB_DIRS	:= $(subdir-y)
 MOD_SUB_DIRS	:= $(sort $(subdir-m) $(both-m))
 ALL_SUB_DIRS	:= $(sort $(subdir-y) $(subdir-m) $(subdir-n) $(subdir-))


 #
 # Common rules
 #

 %.s: %.c
 	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -S $< -o $@

 %.i: %.c
 	$(CPP) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) $< > $@

 %.o: %.c
 	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -c -o $@ $<
 	@ ( \
 	    echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@))),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS_nostdinc) $$(CFLAGS_$@))))' ; \
 	    echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 	    echo 'endif' \
 	) > $(dir $@)/.$(notdir $@).flags

 %.o: %.s
 	$(AS) $(AFLAGS) $(EXTRA_CFLAGS) -o $@ $<

 # Old makefiles define their own rules for compiling .S files,
 # but these standard rules are available for any Makefile that
 # wants to use them.  Our plan is to incrementally convert all
 # the Makefiles to these standard rules.  -- rmk, mec
 ifdef USE_STANDARD_AS_RULE

 %.s: %.S
 	$(CPP) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) $< > $@

 %.o: %.S
 	$(CC) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) -c -o $@ $<

 endif

 %.lst: %.c
 	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@) -g -c -o $*.o $<
 	$(TOPDIR)/scripts/makelst $* $(TOPDIR) $(OBJDUMP)
 #
 #
 #
 all_targets: $(O_TARGET) $(L_TARGET)

 #
 # Rule to compile a set of .o files into one .o file
 #
 ifdef O_TARGET
 $(O_TARGET): $(obj-y)
 	rm -f $@
     ifneq "$(strip $(obj-y))" ""
 	$(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^)
     else
 	$(AR) rcs $@
     endif
 	@ ( \
 	    echo 'ifeq ($(strip $(subst $(comma),:,$(LDFLAGS) $(EXTRA_LDFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(LDFLAGS) $$(EXTRA_LDFLAGS) $$(obj-y))))' ; \
 	    echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 	    echo 'endif' \
 	) > $(dir $@)/.$(notdir $@).flags
 endif # O_TARGET

 #
 # Rule to compile a set of .o files into one .a file
 #
 ifdef L_TARGET
 $(L_TARGET): $(obj-y)
 	rm -f $@
 	$(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y)
 	@ ( \
 	    echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(obj-y))))' ; \
 	    echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 	    echo 'endif' \
 	) > $(dir $@)/.$(notdir $@).flags
 endif


 #
 # This make dependencies quickly
 #
 fastdep: dummy
 	$(TOPDIR)/scripts/mkdep $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -- $(wildcard *.[chS]) > .depend
 ifdef ALL_SUB_DIRS
 	$(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
 endif

 ifdef _FASTDEP_ALL_SUB_DIRS
 $(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
 	$(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
 endif


 #
 # A rule to make subdirectories
 #
 subdir-list = $(sort $(patsubst %,_subdir_%,$(SUB_DIRS)))
 sub_dirs: dummy $(subdir-list)

 ifdef SUB_DIRS
 $(subdir-list) : dummy
 	$(MAKE) -C $(patsubst _subdir_%,%,$@)
 endif

 #
 # A rule to make modules
 #
 ALL_MOBJS = $(filter-out $(obj-y), $(obj-m))
 ifneq "$(strip $(ALL_MOBJS))" ""
 MOD_DESTDIR := $(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 endif

 unexport MOD_DIRS
 MOD_DIRS := $(MOD_SUB_DIRS) $(MOD_IN_SUB_DIRS)
 ifneq "$(strip $(MOD_DIRS))" ""
 .PHONY: $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 $(patsubst %,_modsubdir_%,$(MOD_DIRS)) : dummy
 	$(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules

 .PHONY: $(patsubst %,_modinst_%,$(MOD_DIRS))
 $(patsubst %,_modinst_%,$(MOD_DIRS)) : dummy
 	$(MAKE) -C $(patsubst _modinst_%,%,$@) modules_install
 endif

 .PHONY: modules
 modules: $(ALL_MOBJS) dummy \
 	 $(patsubst %,_modsubdir_%,$(MOD_DIRS))

 .PHONY: _modinst__
 _modinst__: dummy
 ifneq "$(strip $(ALL_MOBJS))" ""
 	mkdir -p $(MODLIB)/kernel/$(MOD_DESTDIR)
 	cp $(sort $(ALL_MOBJS)) $(MODLIB)/kernel/$(MOD_DESTDIR)
 endif

 .PHONY: modules_install
 modules_install: _modinst__ \
 	 $(patsubst %,_modinst_%,$(MOD_DIRS))

 #
 # A rule to do nothing
 #
 dummy:

 #
 # This is useful for testing
 #
 script:
 	$(SCRIPT)

 #
 # This sets version suffixes on exported symbols
 # Separate the object into "normal" objects and "exporting" objects
 # Exporting objects are: all objects that define symbol tables
 #
 ifdef CONFIG_MODULES

 multi-used	:= $(filter $(list-multi), $(obj-y) $(obj-m))
 multi-objs	:= $(foreach m, $(multi-used), $($(basename $(m))-objs))
 active-objs	:= $(sort $(multi-objs) $(obj-y) $(obj-m))

 ifdef CONFIG_MODVERSIONS
 ifneq "$(strip $(export-objs))" ""

 MODINCL = $(TOPDIR)/include/linux/modules

 # The -w option (enable warnings) for genksyms will return here in 2.1
 # So where has it gone?
 #
 # Added the SMP separator to stop module accidents between uniprocessor
 # and SMP Intel boxes - AC - from bits by Michael Chastain
 #

 ifdef CONFIG_SMP
 	genksyms_smp_prefix := -p smp_
 else
 	genksyms_smp_prefix :=
 endif

 $(MODINCL)/%.ver: %.c
 	@if [ ! -r $(MODINCL)/$*.stamp -o $(MODINCL)/$*.stamp -ot $< ]; then \
 		echo '$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -E -D__GENKSYMS__ $<'; \
 		echo '| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
 		$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -E -D__GENKSYMS__ $< \
 		| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp && \
 		if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
 		else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
 	fi && touch $(MODINCL)/$*.stamp

 $(addprefix $(MODINCL)/,$(export-objs:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h

 # updates .ver files but not modversions.h
 fastdep: $(addprefix $(MODINCL)/,$(export-objs:.o=.ver))

 # updates .ver files and modversions.h like before (is this needed?)
 dep: fastdep update-modverfile

 endif # export-objs

 # update modversions.h, but only if it would change
 update-modverfile:
 	@(echo "#ifndef _LINUX_MODVERSIONS_H";\
 	  echo "#define _LINUX_MODVERSIONS_H"; \
 	  echo "#include <linux/modsetver.h>"; \
 	  cd $(TOPDIR)/include/linux/modules; \
 	  for f in *.ver; do \
 	    if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 	  done; \
 	  echo "#endif"; \
 	) > $(TOPDIR)/include/linux/modversions.h.tmp
 	@if [ -r $(TOPDIR)/include/linux/modversions.h ] && cmp -s $(TOPDIR)/include/linux/modversions.h $(TOPDIR)/include/linux/modversions.h.tmp; then \
 		echo $(TOPDIR)/include/linux/modversions.h was not updated; \
 		rm -f $(TOPDIR)/include/linux/modversions.h.tmp; \
 	else \
 		echo $(TOPDIR)/include/linux/modversions.h was updated; \
 		mv -f $(TOPDIR)/include/linux/modversions.h.tmp $(TOPDIR)/include/linux/modversions.h; \
 	fi

 $(active-objs): $(TOPDIR)/include/linux/modversions.h

 else

 $(TOPDIR)/include/linux/modversions.h:
 	@echo "#include <linux/modsetver.h>" > $@

 endif # CONFIG_MODVERSIONS

 ifneq "$(strip $(export-objs))" ""
 $(export-objs): $(export-objs:.o=.c) $(TOPDIR)/include/linux/modversions.h
 	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
 	@ ( \
 	    echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS_nostdinc) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
 	    echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 	    echo 'endif' \
 	) > $(dir $@)/.$(notdir $@).flags
 endif

 endif # CONFIG_MODULES


 #
 # include dependency files if they exist
 #
 ifneq ($(wildcard .depend),)
 include .depend
 endif

 ifneq ($(wildcard $(TOPDIR)/.hdepend),)
 include $(TOPDIR)/.hdepend
 endif

 #
 # Find files whose flags have changed and force recompilation.
 # For safety, this works in the converse direction:
 #   every file is forced, except those whose flags are positively up-to-date.
 #
 FILES_FLAGS_UP_TO_DATE :=

 # For use in expunging commas from flags, which mung our checking.
 comma = ,

 FILES_FLAGS_EXIST := $(wildcard .*.flags)
 ifneq ($(FILES_FLAGS_EXIST),)
 include $(FILES_FLAGS_EXIST)
 endif

 FILES_FLAGS_CHANGED := $(strip \
     $(filter-out $(FILES_FLAGS_UP_TO_DATE), \
 	$(O_TARGET) $(L_TARGET) $(active-objs) \
 	))

 # A kludge: .S files don't get flag dependencies (yet),
 #   because that will involve changing a lot of Makefiles.  Also
 #   suppress object files explicitly listed in $(IGNORE_FLAGS_OBJS).
 #   This allows handling of assembly files that get translated into
 #   multiple object files (see arch/ia64/lib/idiv.S, for example).
 FILES_FLAGS_CHANGED := $(strip \
     $(filter-out $(patsubst %.S, %.o, $(wildcard *.S) $(IGNORE_FLAGS_OBJS)), \
     $(FILES_FLAGS_CHANGED)))

 ifneq ($(FILES_FLAGS_CHANGED),)
 $(FILES_FLAGS_CHANGED): dummy
 endif
	#
	# This file contains rules which are shared between multiple Makefiles.
	#

	#
	# False targets.
	#
	.PHONY: dummy

	#
	# Special variables which should not be exported
	#
	unexport EXTRA_AFLAGS
	unexport EXTRA_CFLAGS
	unexport EXTRA_LDFLAGS
	unexport EXTRA_ARFLAGS
	unexport SUBDIRS
	unexport SUB_DIRS
	unexport ALL_SUB_DIRS
	unexport MOD_SUB_DIRS
	unexport O_TARGET
	unexport ALL_MOBJS

	unexport obj-y
	unexport obj-m
	unexport obj-n
	unexport obj-
	unexport export-objs
	unexport subdir-y
	unexport subdir-m
	unexport subdir-n
	unexport subdir-

	comma := ,
	EXTRA_CFLAGS_nostdinc := $(EXTRA_CFLAGS) $(kbuild_2_4_nostdinc)

	#
	# Get things started.
	#
	first_rule: sub_dirs
	$(MAKE) all_targets

	both-m := $(filter $(mod-subdirs), $(subdir-y))
	SUB_DIRS := $(subdir-y)
	MOD_SUB_DIRS := $(sort $(subdir-m) $(both-m))
	ALL_SUB_DIRS := $(sort $(subdir-y) $(subdir-m) $(subdir-n) $(subdir-))


	#
	# Common rules
	#

	%.s: %.c
	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -S $< -o $@

	%.i: %.c
	$(CPP) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) $< > $@

	%.o: %.c
	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -c -o $@ $<
	@ ( \
	echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@))),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS_nostdinc) $$(CFLAGS_$@))))' ; \
	echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
	echo 'endif' \
	) > $(dir $@)/.$(notdir $@).flags

	%.o: %.s
	$(AS) $(AFLAGS) $(EXTRA_CFLAGS) -o $@ $<

	# Old makefiles define their own rules for compiling .S files,
	# but these standard rules are available for any Makefile that
	# wants to use them. Our plan is to incrementally convert all
	# the Makefiles to these standard rules. -- rmk, mec
	ifdef USE_STANDARD_AS_RULE

	%.s: %.S
	$(CPP) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) $< > $@

	%.o: %.S
	$(CC) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) -c -o $@ $<

	endif

	%.lst: %.c
	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@) -g -c -o $*.o $<
	$(TOPDIR)/scripts/makelst $* $(TOPDIR) $(OBJDUMP)
	#
	#
	#
	all_targets: $(O_TARGET) $(L_TARGET)

	#
	# Rule to compile a set of .o files into one .o file
	#
	ifdef O_TARGET
	$(O_TARGET): $(obj-y)
	rm -f $@
	ifneq "$(strip $(obj-y))" ""
	$(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^)
	else
	$(AR) rcs $@
	endif
	@ ( \
	echo 'ifeq ($(strip $(subst $(comma),:,$(LDFLAGS) $(EXTRA_LDFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(LDFLAGS) $$(EXTRA_LDFLAGS) $$(obj-y))))' ; \
	echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
	echo 'endif' \
	) > $(dir $@)/.$(notdir $@).flags
	endif # O_TARGET

	#
	# Rule to compile a set of .o files into one .a file
	#
	ifdef L_TARGET
	$(L_TARGET): $(obj-y)
	rm -f $@
	$(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y)
	@ ( \
	echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(obj-y))))' ; \
	echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
	echo 'endif' \
	) > $(dir $@)/.$(notdir $@).flags
	endif


	#
	# This make dependencies quickly
	#
	fastdep: dummy
	$(TOPDIR)/scripts/mkdep $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -- $(wildcard *.[chS]) > .depend
	ifdef ALL_SUB_DIRS
	$(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
	endif

	ifdef _FASTDEP_ALL_SUB_DIRS
	$(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
	$(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
	endif


	#
	# A rule to make subdirectories
	#
	subdir-list = $(sort $(patsubst %,_subdir_%,$(SUB_DIRS)))
	sub_dirs: dummy $(subdir-list)

	ifdef SUB_DIRS
	$(subdir-list) : dummy
	$(MAKE) -C $(patsubst _subdir_%,%,$@)
	endif

	#
	# A rule to make modules
	#
	ALL_MOBJS = $(filter-out $(obj-y), $(obj-m))
	ifneq "$(strip $(ALL_MOBJS))" ""
	MOD_DESTDIR := $(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
	endif

	unexport MOD_DIRS
	MOD_DIRS := $(MOD_SUB_DIRS) $(MOD_IN_SUB_DIRS)
	ifneq "$(strip $(MOD_DIRS))" ""
	.PHONY: $(patsubst %,_modsubdir_%,$(MOD_DIRS))
	$(patsubst %,_modsubdir_%,$(MOD_DIRS)) : dummy
	$(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules

	.PHONY: $(patsubst %,_modinst_%,$(MOD_DIRS))
	$(patsubst %,_modinst_%,$(MOD_DIRS)) : dummy
	$(MAKE) -C $(patsubst _modinst_%,%,$@) modules_install
	endif

	.PHONY: modules
	modules: $(ALL_MOBJS) dummy \
	$(patsubst %,_modsubdir_%,$(MOD_DIRS))

	.PHONY: _modinst__
	_modinst__: dummy
	ifneq "$(strip $(ALL_MOBJS))" ""
	mkdir -p $(MODLIB)/kernel/$(MOD_DESTDIR)
	cp $(sort $(ALL_MOBJS)) $(MODLIB)/kernel/$(MOD_DESTDIR)
	endif

	.PHONY: modules_install
	modules_install: _modinst__ \
	$(patsubst %,_modinst_%,$(MOD_DIRS))

	#
	# A rule to do nothing
	#
	dummy:

	#
	# This is useful for testing
	#
	script:
	$(SCRIPT)

	#
	# This sets version suffixes on exported symbols
	# Separate the object into "normal" objects and "exporting" objects
	# Exporting objects are: all objects that define symbol tables
	#
	ifdef CONFIG_MODULES

	multi-used := $(filter $(list-multi), $(obj-y) $(obj-m))
	multi-objs := $(foreach m, $(multi-used), $($(basename $(m))-objs))
	active-objs := $(sort $(multi-objs) $(obj-y) $(obj-m))

	ifdef CONFIG_MODVERSIONS
	ifneq "$(strip $(export-objs))" ""

	MODINCL = $(TOPDIR)/include/linux/modules

	# The -w option (enable warnings) for genksyms will return here in 2.1
	# So where has it gone?
	#
	# Added the SMP separator to stop module accidents between uniprocessor
	# and SMP Intel boxes - AC - from bits by Michael Chastain
	#

	ifdef CONFIG_SMP
	genksyms_smp_prefix := -p smp_
	else
	genksyms_smp_prefix :=
	endif

	$(MODINCL)/%.ver: %.c
	@if [ ! -r $(MODINCL)/$.stamp -o $(MODINCL)/$.stamp -ot $< ]; then \
	echo '$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -E -D__GENKSYMS__ $<'; \
	echo '\| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -E -D__GENKSYMS__ $< \
	\| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp && \
	if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
	else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
	fi && touch $(MODINCL)/$*.stamp

	$(addprefix $(MODINCL)/,$(export-objs:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h

	# updates .ver files but not modversions.h
	fastdep: $(addprefix $(MODINCL)/,$(export-objs:.o=.ver))

	# updates .ver files and modversions.h like before (is this needed?)
	dep: fastdep update-modverfile

	endif # export-objs

	# update modversions.h, but only if it would change
	update-modverfile:
	@(echo "#ifndef _LINUX_MODVERSIONS_H";\
	echo "#define _LINUX_MODVERSIONS_H"; \
	echo "#include <linux/modsetver.h>"; \
	cd $(TOPDIR)/include/linux/modules; \
	for f in *.ver; do \
	if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
	done; \
	echo "#endif"; \
	) > $(TOPDIR)/include/linux/modversions.h.tmp
	@if [ -r $(TOPDIR)/include/linux/modversions.h ] && cmp -s $(TOPDIR)/include/linux/modversions.h $(TOPDIR)/include/linux/modversions.h.tmp; then \
	echo $(TOPDIR)/include/linux/modversions.h was not updated; \
	rm -f $(TOPDIR)/include/linux/modversions.h.tmp; \
	else \
	echo $(TOPDIR)/include/linux/modversions.h was updated; \
	mv -f $(TOPDIR)/include/linux/modversions.h.tmp $(TOPDIR)/include/linux/modversions.h; \
	fi

	$(active-objs): $(TOPDIR)/include/linux/modversions.h

	else

	$(TOPDIR)/include/linux/modversions.h:
	@echo "#include <linux/modsetver.h>" > $@

	endif # CONFIG_MODVERSIONS

	ifneq "$(strip $(export-objs))" ""
	$(export-objs): $(export-objs:.o=.c) $(TOPDIR)/include/linux/modversions.h
	$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
	@ ( \
	echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS_nostdinc) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
	echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
	echo 'endif' \
	) > $(dir $@)/.$(notdir $@).flags
	endif

	endif # CONFIG_MODULES


	#
	# include dependency files if they exist
	#
	ifneq ($(wildcard .depend),)
	include .depend
	endif

	ifneq ($(wildcard $(TOPDIR)/.hdepend),)
	include $(TOPDIR)/.hdepend
	endif

	#
	# Find files whose flags have changed and force recompilation.
	# For safety, this works in the converse direction:
	# every file is forced, except those whose flags are positively up-to-date.
	#
	FILES_FLAGS_UP_TO_DATE :=

	# For use in expunging commas from flags, which mung our checking.
	comma = ,

	FILES_FLAGS_EXIST := $(wildcard .*.flags)
	ifneq ($(FILES_FLAGS_EXIST),)
	include $(FILES_FLAGS_EXIST)
	endif

	FILES_FLAGS_CHANGED := $(strip \
	$(filter-out $(FILES_FLAGS_UP_TO_DATE), \
	$(O_TARGET) $(L_TARGET) $(active-objs) \
	))

	# A kludge: .S files don't get flag dependencies (yet),
	# because that will involve changing a lot of Makefiles. Also
	# suppress object files explicitly listed in $(IGNORE_FLAGS_OBJS).
	# This allows handling of assembly files that get translated into
	# multiple object files (see arch/ia64/lib/idiv.S, for example).
	FILES_FLAGS_CHANGED := $(strip \
	$(filter-out $(patsubst %.S, %.o, $(wildcard *.S) $(IGNORE_FLAGS_OBJS)), \
	$(FILES_FLAGS_CHANGED)))

	ifneq ($(FILES_FLAGS_CHANGED),)
	$(FILES_FLAGS_CHANGED): dummy
	endif