如何为架构x86_64错误修复g ++未定义符号？

首先,我已经在Stackoverflow上阅读了有关此问题的相关内容,但我仍然无法解决它.我尽可能简化了我的代码.

我只有一个带.h和.cpp文件的自定义类,但是在尝试从main.cpp创建此类的实例时出错.

main.cpp中

#include "Customer.h"
using namespace std;

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

    return 0;
}

Customer.h

using namespace std;

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

为customer.cpp

#include "Customer.h"
using namespace std;

Customer::Customer(string input) {
}

我得到的错误信息如下？

  gcc *.cpp -o k


  Undefined symbols for architecture x86_64:
    "std::__1::basic_string, std::__1::allocator >::__init(char const*, unsigned long)", referenced from:
        _main in main-40340f.o
    "std::__1::basic_string, std::__1::allocator >::basic_string(std::__1::basic_string, std::__1::allocator > const&)", referenced from:
        _main in main-40340f.o
    "std::__1::basic_string, std::__1::allocator >::~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)

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

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

当我编写空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？