我在使我的Makefile正常工作时遇到问题。我遇到的第一个问题是对main的未定义引用。我在我的producer.c文件中有main函数。第二个问题是对SearchCustomer（）的未定义引用。

错误：

bash-4.1$ make
gcc -Wall -c producer.c shared.h
gcc -Wall -c consumer.c shared.h
gcc -Wall -c AddRemove.c shared.h
gcc -pthread -Wall -o producer.o consumer.o AddRemove.o
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
AddRemove.o: In function `AddRemove':
AddRemove.c:(.text+0xb1): undefined reference to `SearchCustomer'
AddRemove.c:(.text+0x1e9): undefined reference to `SearchCustomer'
AddRemove.c:(.text+0x351): undefined reference to `SearchCustomer'
collect2: ld returned 1 exit status
make: *** [producer] Error 1

生成文件：

COMPILER = gcc
CCFLAGS = -Wall
all: main

debug:
    make DEBUG=TRUE


main: producer.o consumer.o AddRemove.o
    $(COMPILER) -pthread $(CCFLAGS) -o producer.o consumer.o AddRemove.o
producer.o: producer.c shared.h
    $(COMPILER) $(CCFLAGS) -c producer.c shared.h
consumer.o: consumer.c shared.h
    $(COMPILER) $(CCFLAGS) -c consumer.c shared.h
AddRemove.o: AddRemove.c shared.h
    $(COMPILER) $(CCFLAGS) -c AddRemove.c shared.h


ifeq ($(DEBUG), TRUE)
    CCFLAGS += -g
endif

clean:
    rm -f *.o