Undefined reference to 'function(char*, char*) in g++

[bricebanel]

Hi all,
I've been stuck on this for a while now and haven't find anything relevant on forums...or maybe I just suck at searching...
but here's my little piece of code for which g++ tells me "undefined reference to 'reverse(char const*, char*)'" :

main.cpp:

#include <iostream>
#include "words.h"

using namespace std;

int main() {

  char reversed[9];
  reverse("lairepmi", reversed); //undefined reference to 'reverse(char const*, char*)'
  cout << "'lairepmi' reversed is '" << reversed << "'" << endl;
  reverse("desserts", reversed); //undefined reference to 'reverse(char const*, char*)'
  cout << "'desserts' reversed is '" << reversed << "'" << endl << endl;
}

words.cpp:

#include "words.h"

void reverse(const char *str1, char *str2){
  cout << "it compiles!" << endl;
}

words.h

#ifndef WORDS_H
#define WORDS_H

#include <iostream>
#include <cstring>
#include <cctype>
#include <fstream>

using namespace std;

void reverse(const char *str1, char *str2);

#endif 

the main.cpp file is provided and therefore must not be changed...so the problem definitely doesn't come from there!

I didn't write any code in the function yet as I just want it to compile before I can do anything...Any help would be much appreciated!
Thanks a lot

[Athar]

You probably forgot to compile and link words.cpp.

[bricebanel]

I did forget to link words.cpp...thanks a lot!