makefile 创建文件夹模板

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DIR_INC=. DIR_SRC=. DIR_OBJ:=./obj   SRC = $(wildcard ${DIR_SRC}/*.cpp) OBJ = $(patsubst %.cpp, ${DIR_OBJ}/%.o, $(notdir ${SRC}))   TARGET=JSON BIN_TARGET=$(DIR_OBJ)/$(TARGET) INCLUDE=-I ${DIR_INC} CFLAGS = -g -Wall -std=c++11   All:obj ${BIN_TARGET}   ${BIN_TARGET}:${OBJ}     g++  ${CFLAGS} ${INCLUDE} ${OBJ} ${LIBS} -o $@   ${DIR_OBJ}/%.o:${DIR_SRC}/%.cpp     g++ ${CFLAGS} ${INCLUDE} -c $< -o $@   obj:     mkdir -p $@   .PHONY:clean clean:     rm -rf ${DIR_OBJ}/*.o ${BIN_TARGET}

　第一次makefile时，如果没有obj文件夹的话，会创建该文件夹去存放文件