1st C++ Program From Tutorial Won't Compile With GCC

[jwesleycooper]

I've just tried to compile the first program from the tutorial referenced on this site, which is this:

// my first program in C++

#include <iostream>
using namespace std;

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

But this is what I get when I try to compile it with GCC, even after explicitly specifying it as a C++ program:

jwesleycooper@linux-twom:~/C> gcc -x c++ cpp1.cpp 
/tmp/cc9hRvBj.o: In function `main':
cpp1.cpp:(.text+0x14): undefined reference to `std::cout'
cpp1.cpp:(.text+0x19): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/tmp/cc9hRvBj.o: In function `__static_initialization_and_destruction_0(int, int)':
cpp1.cpp:(.text+0x41): undefined reference to `std::ios_base::Init::Init()'
cpp1.cpp:(.text+0x46): undefined reference to `std::ios_base::Init::~Init()'
collect2: ld returned 1 exit status

Can someone please explain to me what is going wrong, why, and exactly what I must do to correct it?

[moorecm]

Just use:

g++ cpp1.cpp

It'll know it's C++ from the extension and it'll also link with the standard library and console library for you. With gcc, you'd have to explicitly link them.

[jwesleycooper]

Thanks for telling me that... so will that do the same with C programs as well?