common.h

How to write Makefile

#ifndef ABC_COMMON_H
#define ABC_COMMON_H

#include <stdio.h>

#define DEBUGFMT "%s(%d)-%s: "
#define DEBUGARGS __FILE__, __LINE__, __FUNCTION__

#define D__(fmt, args...) {printf(DEBUGFMT fmt, DEBUGARGS, ##args);}

int comm();

#endif