要對(duì)子目錄執(zhí)行make，需要在當(dāng)前目錄制作一個(gè)Makefile，遍歷所有子目錄的Makefile，并運(yùn)行相應(yīng)的make target. 

#

# Reference http://www./software/make/manual/make.html

#

# 需要排除的目錄

exclude_dirs := include bin

# 取得當(dāng)前子目錄深度為1的所有目錄名稱

dirs := $(shell find . -maxdepth 1 -type d)

dirs := $(basename $(patsubst ./%,%,$(dirs)))

dirs := $(filter-out $(exclude_dirs),$(dirs))

# 避免clean子目錄操作同名，加上_clean_前綴

SUBDIRS := $(dirs)

clean_dirs := $(addprefix _clean_,$(SUBDIRS) )

#

.PHONY: subdirs $(SUBDIRS) clean

# 執(zhí)行默認(rèn)make target

$(SUBDIRS):    

$(MAKE) -C $@

subdirs: $(SUBDIRS)

# 執(zhí)行clean

$(clean_dirs):    

$(MAKE) -C $(patsubst _clean_%,%,$@) clean

clean: $(clean_dirs)    

@find . \        

\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \

-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \

-o -name '*.symtypes' \) \

-type f -print | xargs rm -f