C ++编译错误：ld：找不到架构x86_64的符号clang：错误：链接器命令失败，退出代码为1（使用-v查看调用） [英] C++ compilation error: ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

问题描述

有人可以解释一下我在做什么错吗？我正在使用macOS
以下是代码：

Could someone please explain what am I doing wrong here? I am using macOS Here are the codes:

// test.h

//test.h

#include <iostream>
#include <string>
class Test 
{
public:
    Test (std::string, std::string, int);

private:
    std::string par1;
    std::string par2;
    int par3;
};

// test.cpp

//test.cpp

#include <string>
#include <string>
#include "test.h"

using namespace std;

Test::Test (string first, string second, int third)
{
    par1 = first;
    par2 = second;
    par3 = third;
}

// mainTest.cpp

//mainTest.cpp

#include <string>
#include <iostream>
#include "test.h"

using namespace std;

int main()
{
    Test test1 ("A", "B", 2);
}

我用来编译的命令是：

g ++ mainTest.cpp -o mainTest

g++ mainTest.cpp -o mainTest

这是我得到的错误：

Undefined symbols for architecture x86_64:
  "Test::Test(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, int)", referenced from:
      _main in mainTest-056a8f.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我已经搜索了stackoverflow和google，但是我仍然不知道自己做错了什么。非常感谢

I have searched stackoverflow and google but I still can not figure what I did wrong. Thanks a lot

推荐答案

您没有与 test.o 。

g++ -c test.cpp -o test.o
g++ mainTest.cpp test.o -o mainTest

或者您可以同时执行它们：

or you can do them both at once:

g++ maintest.cpp test.cpp -o mainTest

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