build-all/Makefile

   1 include Makefile.dirs
   2
   3 all $(MAKECMDGOALS): Makefile.dirs $(BUILD_DIRS)
   4
   5 Makefile.dirs:
   6         ./create-build-tree.sh
   7
   8 define subdir
   9 .PHONY: $1
  10 $1:
  11         $$(MAKE) -C $1 $(MAKECMDGOALS)
  12 endef
  13
  14 $(foreach d,$(BUILD_DIRS),$(eval $(call subdir,$d)))