Archipelago » qemu

# magic to descend into other directories

obj := .

old-nested-dirs :=

define push-var

$(eval save-$2-$1 = $(value $1))

$(eval $1 :=)

endef

define pop-var

$(eval subdir-$2-$1 := $(if $(filter $2,$(save-$2-$1)),$(addprefix $2,$($1))))

$(eval $1 = $(value save-$2-$1) $$(subdir-$2-$1))

$(eval save-$2-$1 :=)

endef

define unnest-dir

$(foreach var,$(nested-vars),$(call push-var,$(var),$1/))

$(eval obj := $(obj)/$1)

$(eval include $(SRC_PATH)/$1/Makefile.objs)

$(eval obj := $(patsubst %/$1,%,$(obj)))

$(foreach var,$(nested-vars),$(call pop-var,$(var),$1/))

endef

define unnest-vars-1

$(eval nested-dirs := $(filter-out \

    $(old-nested-dirs), \

    $(sort $(foreach var,$(nested-vars), $(filter %/, $($(var)))))))

$(if $(nested-dirs),

  $(foreach dir,$(nested-dirs),$(call unnest-dir,$(patsubst %/,%,$(dir))))

  $(eval old-nested-dirs := $(old-nested-dirs) $(nested-dirs))

  $(call unnest-vars-1))

endef

define unnest-vars

$(call unnest-vars-1)

$(foreach var,$(nested-vars),$(eval $(var) := $(filter-out %/, $($(var)))))

endef