C++的Hello World错误

Question

我开始学习C++,并尝试运行经典的Hello World程序:

#include <iostream>

using namespace std;

int main ()
{
  cout << "Hello, World!";
  return 0;
}

但是当我使用GCC在终端中编译它时,我总是得到错误:

Undefined symbols for architecture x86_64:
  "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const", referenced from:
      std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in ccpe3DPY.o
  "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned long) const", referenced from:
      std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in ccpe3DPY.o
  "std::cout", referenced from:
      _main in ccpe3DPY.o
  "std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from:
      _main in ccpe3DPY.o
  "std::ios_base::Init::Init()", referenced from:
      __static_initialization_and_destruction_0(int, int)in ccpe3DPY.o
  "std::ios_base::Init::~Init()", referenced from:
      ___tcf_0 in ccpe3DPY.o
  "___gxx_personality_v0", referenced from:
      Dwarf Exception Unwind Info (__eh_frame) in ccpe3DPY.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

你能告诉我为什么吗？

Answer 1

您已经编译了程序gcc,它是一个C编译器,而不是C++编译器.使用g++代替; 它知道要包含C++运行时库,其中定义了那些缺少的符号.