"Undefined symbols" compiler error

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"Undefined symbols" compiler error

"Undefined symbols" compiler error

Hi,

I am trying out C++ with a small hello world-program:

#include <iostream>
using namespace std;

int main (int argc, char **argv) {
	cout << "Hello world!" << endl;
}

but when I compile it on OS X with "gcc helloworld.cpp", I get an error:

Undefined symbols:
  "___gxx_personality_v0", referenced from:
      ___gxx_personality_v0$non_lazy_ptr in cc37hhma.o
  "std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from:
      __ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_$non_lazy_ptr in cc37hhma.o
  "std::ios_base::Init::~Init()", referenced from:
      ___tcf_0 in cc37hhma.o
  "std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))", referenced from:
      _main in cc37hhma.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 cc37hhma.o
      std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in cc37hhma.o
      std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in cc37hhma.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 cc37hhma.o
  "std::ios_base::Init::Init()", referenced from:
      __static_initialization_and_destruction_0(int, int)in cc37hhma.o
  "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 cc37hhma.o
  "std::cout", referenced from:
      __ZSt4cout$non_lazy_ptr in cc37hhma.o
ld: symbol(s) not found
collect2: ld returned 1 exit status