makefile相关问题

这是我的工程目录

project/
|-- Driver/
|   |-- Inc/
|   |   |-- drv_delay.h
|   |   |-- drv_gpio.h
|   |   `-- drv_lcd.h
|   `-- Src/
|       |-- drv_delay.c
|       |-- drv_gpio.c
|       `-- drv_lcd.c
|-- Test/
|   |-- Inc/
|   |   `-- test.h
|   `-- Src/
|       |-- test.c
|       `-- ...
|   ` Makefile

以下是我的makefile文件

IDIR = -I ../Driver/Inc \
        -I./Inc

SRCDIR = ../Driver/Src/ \
         ./Src/

OBJDIR = ../obj

OUTDIR = ../bin

CFLAGS= $(IDIR) -W -Wall -D __ARM_LINUX__

DRV_OBJ = drv_delay.o drv_gpio.o drv_lcd.o
DRV_OBJ := $(addprefix ../Driver/Src/, $(DRV_OBJ))

#TEST_OBJ = test.o
#TEST_OBJ := $(addprefix ./Src/, $(TEST_OBJ))

OBJ += $(DRV_OBJ)
#OBJ += $(TEST_OBJ)
OBJ += $(patsubst %.c, $(OBJDIR)/%.o, $(wildcard $(SRCDIR)/*.c))


all : directories $(TARGET)

directories : 
    @mkdir -p $(OBJDIR)
    @mkdir -p $(OUTDIR)
    $(info OBJ = $(OBJ))
    $(info DRV_OBJ = $(DRV_OBJ))
    $(info SRCDIR = $(SRCDIR))
    $(info C = $(wildcard $(SRCDIR)/*.c))
$(TARGET): $(OBJ)
    @echo Generating $(TARGET) ...
    $(CC) -o $(OUTDIR)/$@ $(OBJ) 

$(OBJDIR)/%.o: %.c
    @echo Compiling $< ...
    $(CC) -c -o $@ $< $(CFLAGS) 

.PHONY : clean
clean:
    @echo RM -rf $(OBJDIR)/
    @rm -rf $(OBJDIR)
    
    @echo RM -rf $(OUTDIR)/
    @rm -rf $(OUTDIR)

我的打印是
industio@industio:/home/workspace/testC/project/Test$ make
OBJ = ../Driver/Src/drv_delay.o ../Driver/Src/drv_gpio.o ../Driver/Src/drv_lcd.o
DRV_OBJ = ../Driver/Src/drv_delay.o ../Driver/Src/drv_gpio.o ../Driver/Src/drv_lcd.o
SRCDIR = ../Driver/Src/ ./Src/
C = ../Driver/Src/ ./Src//test.c
Generating NeZhaTest ...
arm-linux-gnueabihf-gcc -o ../bin/NeZhaTest ../Driver/Src/drv_delay.o ../Driver/Src/drv_gpio.o ../Driver/Src/drv_lcd.o
/home/industio/ssd20x/gcc-arm-8.2-2018.08-x86_64-arm-linux-gnueabihf/bin/../arm-linux-gnueabihf/libc/usr/lib/crt1.o: In function _start': /tmp/dgboter/bbs/bc-b1-2-11--rhe6x86_64/buildbot/rhe6x86_64--arm-linux-gnueabihf/build/src/glibc/csu/../sysdeps/arm/start.S:119: undefined reference tomain'
collect2: error: ld returned 1 exit status
Makefile:38: recipe for target 'NeZhaTest' failed
make: *** [NeZhaTest] Error 1

是要加权限嘛