如何修复g ++未定义的符号架构x86_64错误？ [英] How can I fix g++ Undefined symbols for architecture x86_64 error?

问题描述

首先，我已经阅读了关于这个问题的Stackoverflow的相关内容，但我还是不能解决它。我已尽可能简化我的代码。

我只有一个自定义类与.h和.cpp文件，但我在尝试创建一个实例时出错

  #includeCustomer.h
 using namespace std; 
 
 int main（）{
 Customer a（string）; 
 
 return 0; 
} 
  

Customer.h

 使用namespace std; 
 
 class Customer {
 public：
 Customer（string input）; 
}; 
  

Customer.cpp

  #includeCustomer.h
 using namespace std; 
 
 Customer :: Customer（string input）{
} 
  

我得到的错误信息如下？

  gcc * .cpp -ok 
 
 
架构x86_64的未定义符号：
std :: __ 1 :: basic_string< char，std :: __ 1 :: char_traits< char> ;, std :: __ 1 :: allocator< char> char const *，unsigned long），引用自：
 _main in main-40340f.o 
std :: __ 1 :: basic_string< char，std :: __ 1 :: char_traits< char>，std :: __ 1 :: allocator< char>> :: basic_string（std :: __ 1 :: basic_string< char，std :: __ 1 :: char_traits< char>，std :: __ 1 :: allocator< char>> const& ），引用自：
 _main in main-40340f.o 
std :: __ 1 :: basic_string< char，std :: __ 1 :: char_traits< char>，std :: __ 1 :: allocator< ; char>> ::〜basic_string（），引用自：
 _main in main-40340f.o 
std :: terminate（），引用自：
 ___clang_call_terminate in main -40340f.o 
___cxa_begin_catch，引用自：
 ___clang_call_terminate in main-40340f.o 
___gxx_personality_v0，引用自：
 _main in main-40340f.o 
 Dwarf Exception Unwind Info（__eh_frame）in main-40340f.o 
 ld：没有为架构x86_64找到符号
 clang：error：linker命令失败，退出代码为1（使用-v参见调用）
 
 clang：error：linker命令失败，退出代码1（使用-v查看调用）
  

我运行Mac OS X 10.9和Sublime Text 3. gcc -v提供以下内容：

 配置：--prefix = / Library / Developer / CommandLineTools / usr --with-gxx-include-dir = / usr / include / c ++ / 4.2.1 
 Apple LLVM版本5.1（clang-503.0.40 ）（基于LLVM 3.4svn）
目标：x86_64-apple-darwin13.1.0 
线程模型：posix 
  

当我写空的构造函数而不是这些时，它编译没有问题。

什么可能导致这个问题？

解决方案

两个问题：

<您应该 #include< string> 。

1. 要在OS X上编译C ++代码，请使用 clang ++ 或 g ++ 。

First of all, I've read the related content on Stackoverflow on this problem but I still can't solve it. I've simplified my code as much as possible.

I've only a custom class with .h and .cpp files but I get error while trying to create an instance of this class from main.cpp.

main.cpp

#include "Customer.h"
using namespace std;

int main() {
    Customer a("string");

    return 0;
}

Customer.h

using namespace std;

class Customer {
public:
    Customer(string input);
};

Customer.cpp

#include "Customer.h"
using namespace std;

Customer::Customer(string input) {
}

The error message I get is the following?

  gcc *.cpp -o k


  Undefined symbols for architecture x86_64:
    "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__init(char const*, unsigned long)", referenced from:
        _main in main-40340f.o
    "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from:
        _main in main-40340f.o
    "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()", referenced from:
        _main in main-40340f.o
    "std::terminate()", referenced from:
        ___clang_call_terminate in main-40340f.o
    "___cxa_begin_catch", referenced from:
        ___clang_call_terminate in main-40340f.o
    "___gxx_personality_v0", referenced from:
        _main in main-40340f.o
        Dwarf Exception Unwind Info (__eh_frame) in main-40340f.o
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

clang: error: linker command failed with exit code 1 (use -v to see invocation)

I run Mac OS X 10.9 and Sublime Text 3. gcc -v gives the following:

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix

It compiles without problem when I write empty constructors instead of these.

What could cause this problem?

解决方案

Two problems:

1. You should #include <string>.
2. To compile C++ code on OS X, use clang++ or g++.

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