Quick help needed please

Hi all, I'm stuck with this program and cannot figure out why it's not compiling on me. It keeps giving me an 'undefined reference to bar' error message and fails to compile. Any ideas/suggestions please? Thanks

Code:

#include <stdio.h>

extern void bar(int *);

void progy ()
{
         int *val;
  
         bar(val);
        
         .....

         .....

}

main() 
{

progy();

....

....


}

Fails to compile or fails to link? Do you have a bar function defined in some other source file somewhere? If you don't then I'd expect it to compile but not link.

> It keeps giving me an 'undefined reference to bar' error message and fails to compile.
You've stated with "extern void bar(int *);" that bar is in another file.

Depending on your compiler / IDE, you need to arrange for the following to happen
gcc prog.c bar.c
That is, you need to compile ALL your source files.