1.. specify the directores , i not specified , search current directory put every folder into a listSRCDIRS := ifeq ($(SRCDIRS),)SRCDIRS := $(shell find $(SRCDIRS) -type d) 2.. addprefix:作用是给每个string添加前缀,string之间用空格隔开.$(addprefix prefixstr, string1 s…