Makefile：链接器错误

Question

除了混合和匹配 .c 和 .cpp 文件之外，这是一个简单的 Makefile -- 但是，我不太确定为什么它不能编译。我假设这是因为链接器错误，因为它只是在抱怨网络 class。有哪位大侠知道下面是什么问题吗？

CC=g++
DEBUG=-g
CFLAGS=$(DEBUG) -Wall -D_POSIX_C_SOURCE -pthread -std=c++0x
HEADERS=cl_network.h

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

all: server.o client.o cl_network.o
    $(CC) $(CFLAGS) server.o -o server
    $(CC) $(CFLAGS) client.o -o client
    $(CC) $(CFLAGS) cl_network.o -o cl_network

client.o: client.cpp cl_network.h
    $(CC) $(CFLAGS) -c client.cpp

server.o: server.c
    $(CC) $(CFLAGS) -c server.c

cl_network.o: cl_network.cpp cl_network.h
    $(CC) $(CFLAGS) -c cl_network.cpp

.PHONY: clean
clean:
    rm  server.o server client.o client cl_network cl_network.o

Errors:
client.cpp:49: undefined reference to `cl_network::cl_network(char*)'
client.cpp:50: undefined reference to `cl_network::connectToServer()'
client.cpp:63: undefined reference to `cl_network::~cl_network()'
client.cpp:63: undefined reference to `cl_network::~cl_network()'

Answer 1

我猜您可能希望 all 目标看起来像这样

all: server.o client.o cl_network.o
    $(CC) $(CFLAGS) server.o cl_network.o -o server
    $(CC) $(CFLAGS) client.o cl_network.o -o client

Makefile：链接器错误

Makefile: linker errors

c

c++

makefile

linker-errors