The problem I have is a circular dependency issue in C header files ...Having looked around I suspect the solution will have something to do with Forward Definitions, but although there are many similar problems listed, none seem to offer the information I require to resolve this one...

I have the following 5 source files:

// fwd1.h
#ifndef __FWD1_H
#define __FWD1_H

#include "fwd2.h"

typedef
  struct Fwd1 {
    Fwd2  *f;
 }
Fwd1;

void  fwd1 (Fwd1 *f1,  Fwd2 *f2) ;

#endif // __FWD1_H

.

// fwd1.c
#include "fwd1.h"
#include "fwd2.h"
void  fwd1 (Fwd1 *f1,  Fwd2 *f2)  { return; }

.

// fwd2.h
#ifndef __FWD2_H
#define __FWD2_H

#include "fwd1.h"

typedef
  struct Fwd2 {
    Fwd1  *f;
  }
Fwd2;

void  fwd2 (Fwd1 *f1,  Fwd2 *f2) ;

#endif // __FWD2_H

.

// fwd2.c
#include "fwd1.h"
#include "fwd2.h"
void  fwd2 (Fwd1 *f1,  Fwd2 *f2)  { return; }

.

// fwdMain.c
#include "fwd1.h"
#include "fwd2.h"
int  main (int argc, char** argv, char** env)
{
  Fwd1  *f1 = (Fwd1*)0;
  Fwd2  *f2 = (Fwd2*)0;

  fwd1(f1, f2);
  fwd2(f1, f2);

  return 0;
}

Which I am compiling with the command: gcc fwdMain.c fwd1.c fwd2.c -o fwd -Wall

I have tried several ideas to resolve the compile errors, but have only managed to replace the errors with other errors ...How do I resolve the circular dependency issue with the least changes to my code? ...Ideally, as a matter of coding style, I would like to avoid putting the word "struct" all over my code.