目标文件:源码经过编译还没有链接那些中间文件.linux .o文件
gcc $(CFLAGS) -c xxx.c -o xx.o

include Makefile.config 

SRC := $(wildcard *.c wildcard ./audio_module/*.c)
SRC_OBJ = $(patsubst %.c,%.o,$(SRC))

all:$(SRC_OBJ) 
	$(info contents $(SRC))
	$(info objfiles $(SRC_OBJ))

%.o: %.c
	$(CC)   $(CFLAGS) -c $< -o $@

.PHONY:clean
clean:
	$(RM)  $(SRC_OBJ)