Merge http://linux-isdn.bkbits.net/linux-2.5.make

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

5 files changed, 597 insertions, 6 deletions

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
new file mode 100644
index 000000000000..cd75f49b58f9
--- /dev/null
+++ b/scripts/Makefile.build
@@ -0,0 +1,223 @@
+# ==========================================================================
+# Building
+# ==========================================================================
+
+src := $(obj)
+
+.PHONY: __build
+__build:
+
+include .config
+
+include $(obj)/Makefile
+
+include scripts/Makefile.lib
+
+ifdef O_TARGET
+$(error kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.5. Please fix!)
+endif
+
+ifdef L_TARGET
+ifneq ($(L_TARGET),lib.a)
+$(warning kbuild: $(obj)/Makefile - L_TARGET := $(L_TARGET) target shall be renamed to lib.a. Please fix!)
+endif
+endif
+
+ifdef list-multi
+$(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.5. Please fix!)
+endif
+
+ifndef obj
+$(warning kbuild: Makefile.build is included improperly)
+endif
+
+# ===========================================================================
+
+# If a Makefile does not define a L_TARGET, link an object called "built-in.o"
+
+ifdef L_TARGET
+L_TARGET := $(obj)/$(L_TARGET)
+else
+O_TARGET := $(obj)/built-in.o
+endif
+
+__build: $(if $(KBUILD_BUILTIN),$(O_TARGET) $(L_TARGET) $(EXTRA_TARGETS)) \
+	 $(if $(KBUILD_MODULES),$(obj-m)) \
+	 $(subdir-ym)
+	@:
+
+# Compile C sources (.c)
+# ---------------------------------------------------------------------------
+
+# Default is built-in, unless we know otherwise
+modkern_cflags := $(CFLAGS_KERNEL)
+
+$(real-objs-m)        : modkern_cflags := $(CFLAGS_MODULE)
+$(real-objs-m:.o=.i)  : modkern_cflags := $(CFLAGS_MODULE)
+$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
+
+$(export-objs)        : export_flags   := $(EXPORT_FLAGS)
+$(export-objs:.o=.i)  : export_flags   := $(EXPORT_FLAGS)
+$(export-objs:.o=.s)  : export_flags   := $(EXPORT_FLAGS)
+$(export-objs:.o=.lst): export_flags   := $(EXPORT_FLAGS)
+
+c_flags = -Wp,-MD,$(depfile) $(CFLAGS) $(NOSTDINC_FLAGS) \
+	  $(modkern_cflags) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o) \
+	  -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) \
+	  $(export_flags) 
+
+quiet_cmd_cc_s_c = CC      $@
+cmd_cc_s_c       = $(CC) $(c_flags) -S -o $@ $< 
+
+%.s: %.c FORCE
+	$(call if_changed_dep,cc_s_c)
+
+quiet_cmd_cc_i_c = CPP     $@
+cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
+
+%.i: %.c FORCE
+	$(call if_changed_dep,cc_i_c)
+
+quiet_cmd_cc_o_c = CC      $@
+cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
+
+%.o: %.c FORCE
+	$(call if_changed_dep,cc_o_c)
+
+quiet_cmd_cc_lst_c = MKLST   $@
+cmd_cc_lst_c       = $(CC) $(c_flags) -g -c -o $*.o $< && sh scripts/makelst $*.o System.map $(OBJDUMP) > $@
+
+%.lst: %.c FORCE
+	$(call if_changed_dep,cc_lst_c)
+
+# Compile assembler sources (.S)
+# ---------------------------------------------------------------------------
+
+modkern_aflags := $(AFLAGS_KERNEL)
+
+$(real-objs-m)      : modkern_aflags := $(AFLAGS_MODULE)
+$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
+
+a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(NOSTDINC_FLAGS) \
+	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
+
+quiet_cmd_as_s_S = CPP     $@
+cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $< 
+
+%.s: %.S FORCE
+	$(call if_changed_dep,as_s_S)
+
+quiet_cmd_as_o_S = AS      $@
+cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
+
+%.o: %.S FORCE
+	$(call if_changed_dep,as_o_S)
+
+targets += $(real-objs-y) $(real-objs-m) $(EXTRA_TARGETS) $(MAKECMDGOALS)
+
+# Build the compiled-in targets
+# ---------------------------------------------------------------------------
+
+# To build objects in subdirs, we need to descend into the directories
+$(sort $(subdir-obj-y)): $(subdir-ym) ;
+
+#
+# Rule to compile a set of .o files into one .o file
+#
+ifdef O_TARGET
+quiet_cmd_link_o_target = LD      $@
+# If the list of objects to link is empty, just create an empty O_TARGET
+cmd_link_o_target = $(if $(strip $(obj-y)),\
+		      $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^),\
+		      rm -f $@; $(AR) rcs $@)
+
+$(O_TARGET): $(obj-y) FORCE
+	$(call if_changed,link_o_target)
+
+targets += $(O_TARGET)
+endif # O_TARGET
+
+#
+# Rule to compile a set of .o files into one .a file
+#
+ifdef L_TARGET
+quiet_cmd_link_l_target = AR      $@
+cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y)
+
+$(L_TARGET): $(obj-y) FORCE
+	$(call if_changed,link_l_target)
+
+targets += $(L_TARGET)
+endif
+
+#
+# Rule to link composite objects
+#
+
+quiet_cmd_link_multi = LD      $@
+cmd_link_multi = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(addprefix $(obj)/,$($(subst $(obj)/,,$(@:.o=-objs))) $($(subst $(obj)/,,$(@:.o=-y)))),$^)
+
+# We would rather have a list of rules like
+# 	foo.o: $(foo-objs)
+# but that's not so easy, so we rather make all composite objects depend
+# on the set of all their parts
+$(multi-used-y) : %.o: $(multi-objs-y) FORCE
+	$(call if_changed,link_multi)
+
+$(multi-used-m) : %.o: $(multi-objs-m) FORCE
+	$(call if_changed,link_multi)
+
+targets += $(multi-used-y) $(multi-used-m)
+
+# Compile programs on the host
+# ===========================================================================
+
+quiet_cmd_host_cc__c  = HOSTCC  $@
+cmd_host_cc__c        = $(HOSTCC) -Wp,-MD,$(depfile) \
+			$(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
+			$(HOST_LOADLIBES) -o $@ $<
+
+$(host-progs-single): %: %.c FORCE
+	$(call if_changed_dep,host_cc__c)
+
+quiet_cmd_host_cc_o_c = HOSTCC  $@
+cmd_host_cc_o_c       = $(HOSTCC) -Wp,-MD,$(depfile) \
+			$(HOSTCFLAGS) $(HOST_EXTRACFLAGS) -c -o $@ $<
+
+$(host-progs-multi-objs): %.o: %.c FORCE
+	$(call if_changed_dep,host_cc_o_c)
+
+quiet_cmd_host_cc__o  = HOSTLD  $@
+cmd_host_cc__o        = $(HOSTCC) $(HOSTLDFLAGS) -o $@ $(addprefix $(obj)/,$($(subst $(obj)/,,$@)-objs)) \
+			$(HOST_LOADLIBES)
+
+$(host-progs-multi): %: $(host-progs-multi-objs) FORCE
+	$(call if_changed,host_cc__o)
+
+targets += $(host-progs-single) $(host-progs-multi-objs) $(host-progs-multi) 
+
+# Descending
+# ---------------------------------------------------------------------------
+
+.PHONY: $(subdir-ym)
+$(subdir-ym):
+	$(Q)$(MAKE) -f scripts/Makefile.build obj=$@
+
+# Add FORCE to the prequisites of a target to force it to be always rebuilt.
+# ---------------------------------------------------------------------------
+
+.PHONY: FORCE
+
+FORCE:
+
+# Read all saved command lines and dependencies for the $(targets) we
+# may be building above, using $(if_changed{,_dep}). As an
+# optimization, we don't need to read them if the target does not
+# exist, we will rebuild anyway in that case.
+
+targets := $(wildcard $(sort $(targets)))
+cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
+
+ifneq ($(cmd_files),)
+  include $(cmd_files)
+endif
diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
index d7bb2dfb88d8..e7c392fd5788 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -1,13 +1,17 @@
+# ==========================================================================
+# Cleaning up
+# ==========================================================================
 
 src := $(obj)
 
-no-rules.make := 1
-
 .PHONY: __clean
 __clean:
 
 include $(obj)/Makefile
 
+# Figure out what we need to build from the various variables
+# ==========================================================================
+
 __subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
 subdir-y	+= $(__subdir-y)
 __subdir-m	:= $(patsubst %/,%,$(filter %/, $(obj-m)))
@@ -17,26 +21,43 @@ subdir-n	+= $(__subdir-n)
 __subdir-	:= $(patsubst %/,%,$(filter %/, $(obj-)))
 subdir-		+= $(__subdir-)
 
+# Subdirectories we need to descend into
+
 subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
 subdir-ymn      := $(sort $(subdir-ym) $(subdir-n) $(subdir-))
 
+# Add subdir path
+
 EXTRA_TARGETS	:= $(addprefix $(obj)/,$(EXTRA_TARGETS))
 clean-files	:= $(addprefix $(obj)/,$(clean-files))
 host-progs	:= $(addprefix $(obj)/,$(host-progs))
 subdir-ymn	:= $(addprefix $(obj)/,$(subdir-ymn))
 
+# ==========================================================================
+
 __clean-files := $(wildcard $(EXTRA_TARGETS) $(host-progs) $(clean-files))
 
+quiet_cmd_clean = CLEAN   $(obj)
+      cmd_clean = rm -f $(__clean-files); $(clean-rule)
+
 __clean: $(subdir-ymn)
 ifneq ($(strip $(__clean-files) $(clean-rule)),)
-	rm -f $(__clean-files)
-	$(clean-rule)
+	+$(call cmd,clean)
 else
 	@:
 endif
 
-.PHONY: $(subdir-ymn)
+# ===========================================================================
+# Generic stuff
+# ===========================================================================
+
+# Descending
+# ---------------------------------------------------------------------------
 
+.PHONY: $(subdir-ymn)
 $(subdir-ymn):
-	$(MAKE) -rR -f scripts/Makefile.clean obj=$@
+	$(Q)$(MAKE) -f scripts/Makefile.clean obj=$@
+
+# If quiet is set, only print short version of command
 
+cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
new file mode 100644
index 000000000000..73668ee0fbea
--- /dev/null
+++ b/scripts/Makefile.lib
@@ -0,0 +1,190 @@
+# ===========================================================================
+# kbuild: Generic definitions
+# ===========================================================================
+
+# Standard vars
+
+comma   := ,
+
+# Figure out what we need to build from the various variables
+# ===========================================================================
+
+# When an object is listed to be built compiled-in and modular,
+# only build the compiled-in version
+
+obj-m := $(filter-out $(obj-y),$(obj-m))
+
+# Handle objects in subdirs
+# ---------------------------------------------------------------------------
+# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
+#   and add the directory to the list of dirs to descend into: $(subdir-y)
+# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 
+#   and add the directory to the list of dirs to descend into: $(subdir-m)
+
+__subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
+subdir-y	+= $(__subdir-y)
+__subdir-m	:= $(patsubst %/,%,$(filter %/, $(obj-m)))
+subdir-m	+= $(__subdir-m)
+obj-y		:= $(patsubst %/, %/built-in.o, $(obj-y))
+obj-m		:= $(filter-out %/, $(obj-m))
+
+# Subdirectories we need to descend into
+
+subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
+
+# export.o is never a composite object, since $(export-objs) has a
+# fixed meaning (== objects which EXPORT_SYMBOL())
+__obj-y = $(filter-out export.o,$(obj-y))
+__obj-m = $(filter-out export.o,$(obj-m))
+
+# if $(foo-objs) exists, foo.o is a composite object 
+multi-used-y := $(sort $(foreach m,$(__obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
+multi-used-m := $(sort $(foreach m,$(__obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
+
+# Build list of the parts of our composite objects, our composite
+# objects depend on those (obviously)
+multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
+multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
+
+# $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
+# in the local directory
+subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
+
+# Replace multi-part objects by their individual parts, look at local dir only
+real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(EXTRA_TARGETS)
+real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
+
+# Only build module versions for files which are selected to be built
+export-objs := $(filter $(export-objs),$(real-objs-y) $(real-objs-m))
+
+host-progs-single     := $(foreach m,$(host-progs),$(if $($(m)-objs),,$(m)))
+host-progs-multi      := $(foreach m,$(host-progs),$(if $($(m)-objs),$(m)))
+host-progs-multi-objs := $(foreach m,$(host-progs-multi),$($(m)-objs))
+
+# Add subdir path
+
+EXTRA_TARGETS	:= $(addprefix $(obj)/,$(EXTRA_TARGETS))
+obj-y		:= $(addprefix $(obj)/,$(obj-y))
+obj-m		:= $(addprefix $(obj)/,$(obj-m))
+export-objs	:= $(addprefix $(obj)/,$(export-objs))
+subdir-obj-y	:= $(addprefix $(obj)/,$(subdir-obj-y))
+real-objs-y	:= $(addprefix $(obj)/,$(real-objs-y))
+real-objs-m	:= $(addprefix $(obj)/,$(real-objs-m))
+multi-used-y	:= $(addprefix $(obj)/,$(multi-used-y))
+multi-used-m	:= $(addprefix $(obj)/,$(multi-used-m))
+multi-objs-y	:= $(addprefix $(obj)/,$(multi-objs-y))
+multi-objs-m	:= $(addprefix $(obj)/,$(multi-objs-m))
+subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
+host-progs	:= $(addprefix $(obj)/,$(host-progs))
+host-progs-single     := $(addprefix $(obj)/,$(host-progs-single))
+host-progs-multi      := $(addprefix $(obj)/,$(host-progs-multi))
+host-progs-multi-objs := $(addprefix $(obj)/,$(host-progs-multi-objs))
+
+# The temporary file to save gcc -MD generated dependencies must not
+# contain a comma
+depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
+
+# Shipped files
+# ===========================================================================
+
+quiet_cmd_shipped = SHIPPED $@
+cmd_shipped = cat $< > $@
+
+%:: %_shipped
+	$(call cmd,shipped)
+
+# Commands useful for building a boot image
+# ===========================================================================
+# 
+#	Use as following:
+#
+#	target: source(s) FORCE
+#		$(if_changed,ld/objcopy/gzip)
+#
+#	and add target to EXTRA_TARGETS so that we know we have to
+#	read in the saved command line
+
+# Linking
+# ---------------------------------------------------------------------------
+
+quiet_cmd_ld = LD      $@
+cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
+	       $(filter-out FORCE,$^) -o $@ 
+
+# Objcopy
+# ---------------------------------------------------------------------------
+
+quiet_cmd_objcopy = OBJCOPY $@
+cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $< $@
+
+# Gzip
+# ---------------------------------------------------------------------------
+
+quiet_cmd_gzip = GZIP    $@
+cmd_gzip = gzip -f -9 < $< > $@
+
+# ===========================================================================
+# Generic stuff
+# ===========================================================================
+
+# function to only execute the passed command if necessary
+
+if_changed = $(if $(strip $? \
+		          $(filter-out $(cmd_$(1)),$(cmd_$@))\
+			  $(filter-out $(cmd_$@),$(cmd_$(1)))),\
+	@set -e; \
+	$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))';) \
+	$(cmd_$(1)); \
+	echo 'cmd_$@ := $(cmd_$(1))' > $(@D)/.$(@F).cmd)
+
+
+# execute the command and also postprocess generated .d dependencies
+# file
+
+if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
+		          $(filter-out $(cmd_$(1)),$(cmd_$@))\
+			  $(filter-out $(cmd_$@),$(cmd_$(1)))),\
+	@set -e; \
+	$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))';) \
+	$(cmd_$(1)); \
+	scripts/fixdep $(depfile) $@ '$(cmd_$(1))' > $(@D)/.$(@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 $(cmd_$(1)),$(cmd_$@))\
+			       $(filter-out $(cmd_$@),$(cmd_$(1)))),\
+			@set -e; \
+			mkdir -p $(dir $@); \
+			$(rule_$(1)))
+
+# If quiet is set, only print short version of command
+
+cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
+
+# do_cmd is a shorthand used to support both compressed, verbose
+# and silent output in a single line.
+# Compared to cmd described avobe, do_cmd does no rely on any variables 
+# previously assigned a value.
+#
+# Usage $(call do_cmd,CMD   $@,cmd_to_execute bla bla)
+# Example:
+# $(call do_cmd,CP $@,cp -b $< $@)
+# make -s => nothing will be printed
+# make KBUILD_VERBOSE=1 => cp -b path/to/src.file path/to/dest.file
+# make KBUILD_VERBOSE=0 =>   CP path/to/dest.file
+define do_cmd
+	@$(if $(filter quiet_,$(quiet)), echo '  $(1)' &&,
+           $(if $(filter silent_,$(quiet)),,
+             echo "$(2)" &&)) \
+        $(2)
+endef
+
+#	$(call descend,<dir>,<target>)
+#	Recursively call a sub-make in <dir> with target <target> 
+
+descend = $(Q)$(MAKE) -f scripts/Makefile.build obj=$(1) $(2)
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
new file mode 100644
index 000000000000..626a9a95866c
--- /dev/null
+++ b/scripts/Makefile.modinst
@@ -0,0 +1,34 @@
+# ==========================================================================
+# Installing modules
+# ==========================================================================
+
+src := $(obj)
+
+.PHONY: modules_install
+modules_install:
+
+include .config
+
+include $(obj)/Makefile
+
+include scripts/Makefile.lib
+
+# ==========================================================================
+
+quiet_cmd_modules_install = INSTALL $(obj-m)
+      cmd_modules_install = mkdir -p $(MODLIB)/kernel/$(obj); \
+			    cp $(obj-m) $(MODLIB)/kernel/$(obj)
+
+modules_install: $(subdir-ym)
+ifneq ($(obj-m),)
+	$(call cmd,modules_install)
+else
+	@:
+endif
+
+# Descending
+# ---------------------------------------------------------------------------
+
+.PHONY: $(subdir-ym)
+$(subdir-ym):
+	$(Q)$(MAKE) -rR -f scripts/Makefile.modinst obj=$@
diff --git a/scripts/Makefile.modver b/scripts/Makefile.modver
new file mode 100644
index 000000000000..0ee922a3aadf
--- /dev/null
+++ b/scripts/Makefile.modver
@@ -0,0 +1,123 @@
+# ===========================================================================
+# Module versions
+# ===========================================================================
+
+src := $(obj)
+
+.PHONY: modver
+modver:
+
+include .config
+
+include $(obj)/Makefile
+
+include scripts/Makefile.lib
+
+# ===========================================================================
+
+ifeq ($(strip $(export-objs)),)
+
+# If we don't export any symbols in this dir, just descend
+# ---------------------------------------------------------------------------
+
+modver: $(subdir-ym)
+	@:
+
+else
+
+# This sets version suffixes on exported symbols
+# ---------------------------------------------------------------------------
+
+MODVERDIR := include/linux/modules
+
+#
+# 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
+
+#	Don't include modversions.h, we're just about to generate it here.
+
+CFLAGS_MODULE := $(filter-out -include include/linux/modversions.h,$(CFLAGS_MODULE))
+
+$(addprefix $(MODVERDIR)/,$(real-objs-y:.o=.ver)): modkern_cflags := $(CFLAGS_KERNEL)
+$(addprefix $(MODVERDIR)/,$(real-objs-m:.o=.ver)): modkern_cflags := $(CFLAGS_MODULE)
+$(addprefix $(MODVERDIR)/,$(export-objs:.o=.ver)): export_flags   := -D__GENKSYMS__
+
+c_flags = -Wp,-MD,$(depfile) $(CFLAGS) $(NOSTDINC_FLAGS) \
+	  $(modkern_cflags) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o) \
+	  -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) \
+	  $(export_flags) 
+
+# Our objects only depend on modversions.h, not on the individual .ver
+# files (fix-dep filters them), so touch modversions.h if any of the .ver
+# files changes
+
+quiet_cmd_cc_ver_c = MKVER   include/linux/modules/$*.ver
+cmd_cc_ver_c = $(CPP) $(c_flags) $< | $(GENKSYMS) $(genksyms_smp_prefix) \
+		 -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp
+
+# Okay, let's explain what's happening in rule_make_cc_ver_c:
+# o echo the command
+# o execute the command
+# o If the $(CPP) fails, we won't notice because it's output is piped
+#   to $(GENKSYMS) which does not fail. We recognize this case by
+#   looking if the generated $(depfile) exists, though.
+# o If the .ver file changed, touch modversions.h, which is our marker
+#   of any changed .ver files.
+# o Move command line and deps into their normal .*.cmd place.  
+
+define rule_cc_ver_c
+	$(if $($(quiet)cmd_cc_ver_c),echo '  $($(quiet)cmd_cc_ver_c)';) \
+	$(cmd_cc_ver_c); \
+	if [ ! -r $(depfile) ]; then exit 1; fi; \
+	scripts/fixdep $(depfile) $@ '$(cmd_cc_ver_c)' > $(@D)/.$(@F).tmp; \
+	rm -f $(depfile); \
+	if [ ! -r $@ ] || cmp -s $@ $@.tmp; then \
+	  touch include/linux/modversions.h; \
+	fi; \
+	mv -f $@.tmp $@
+	mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
+endef
+
+targets := $(addprefix $(MODVERDIR)/,$(export-objs:.o=.ver))
+
+$(MODVERDIR)/%.ver: %.c FORCE
+	@$(call if_changed_rule,cc_ver_c)
+
+modver: $(targets) $(subdir-ym)
+	@mkdir -p $(dir $(addprefix .tmp_export-objs/modules/,$(export-objs:.o=.ver)))
+	@touch $(addprefix .tmp_export-objs/modules/,$(export-objs:.o=.ver))
+
+endif # export-objs 
+
+# Descending
+# ---------------------------------------------------------------------------
+
+.PHONY: $(subdir-ym)
+$(subdir-ym):
+	$(Q)$(MAKE) -f scripts/Makefile.modver obj=$@
+
+# Add FORCE to the prequisites of a target to force it to be always rebuilt.
+# ---------------------------------------------------------------------------
+
+.PHONY: FORCE
+
+FORCE:
+
+# Read all saved command lines and dependencies for the $(targets) we
+# may be building above, using $(if_changed{,_dep}). As an
+# optimization, we don't need to read them if the target does not
+# exist, we will rebuild anyway in that case.
+
+targets := $(wildcard $(sort $(targets)))
+cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
+
+ifneq ($(cmd_files),)
+  include $(cmd_files)
+endif