[U-Boot] u-boot Makefile Questions

[chuck huang]

Dear all,

	I have some questions about u-boot Makefile.

	Could you help me ?

	Thx!

	The below is my question.

	First, we do make _depend for those $(SUBDIRS) $(CPUDIR)
$(LDSCRIPT_MAKEFILE_DIR)

	depend dep:	$(TIMESTAMP_FILE) $(VERSION_FILE) \
		$(obj)include/autoconf.mk \
		$(obj)include/generated/generic-asm-offsets.h \
		$(obj)include/generated/asm-offsets.h
		for dir in $(SUBDIRS) $(CPUDIR) $(LDSCRIPT_MAKEFILE_DIR) ;
do \
			$(MAKE) -C $$dir _depend ; done

	after we already generated the .depend file in those dirs.

	$(SUBDIRS):	depend
		$(MAKE) -C $@ all

	That would do make action in SUBDIRS dir.
	But why we also sinclude .depend in those Makefile which is base on
those dir ? I regard that we already generated before.

	And another questions, how does the other sub-dir(eg, libs) .depend
file generated ? is that generated by rules.mk which is include every
sub-dirs?


Best regards