kbuild: refactor subdir-ym calculation

modorder	:= $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))

endif

# Subdirectories we need to descend into

subdir-ym := $(sort $(subdir-y) $(subdir-m) \

			$(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))

# Handle objects in subdirs

# ---------------------------------------------------------------------------

# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a

#   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)

ifdef need-builtin

obj-y		:= $(patsubst %/, %/built-in.a, $(obj-y))

else

endif

obj-m		:= $(filter-out %/, $(obj-m))

# Subdirectories we need to descend into

subdir-ym	:= $(sort $(subdir-y) $(subdir-m))

# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object

multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))

multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))