#include <stdio.h>

/*
 *         http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html
 *
 *                        C99       gcc(1)  gcc(2)
 *        Intel cc 5.0    x         x       x
 *        CC Sun 2.1      -         -       -
 *        cc Sun WS 5     -         -       -
 *        Compaq C V6.x   -         -       -
 *        HP C 11.01      -         -       -
 *        gcc 2.7.2.f.1   -         x       -
 *        gcc 2.8.1       -         x       -
 *        gcc 2.96        x         x       x
 *        gcc 3.0.4       x         x       x
 *        MIPS Pro 7      -         -       -
 */

#ifdef USE_C99
#define debugc99(format, ...) fprintf (stderr, format, __VA_ARGS__)
#endif

#if (defined __GNUC__ ) || (defined DEBUG1)
#define debug(format, args...) fprintf (stderr, format, args)
#ifndef DEBUG1
#define DEBUG1  1
#endif
#endif

#if ((defined  __GNUC__) && ( ( __GNUC_MINOR__ > 8 ) || ( __GNUC__ > 2 ))) || (defined DEBUG2 )
#ifndef DEBUG2
#define DEBUG2  1
#endif
#define debug2(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
#endif



int main(void)
{
    printf("Hello, World!\n");
#ifdef __GNUC__
    printf("gcc %d.%d\n",__GNUC__,__GNUC_MINOR__);
#endif

#ifdef DEBUG1
    debug("%d\t%s\n",__LINE__,"Hola");
#endif

#ifdef DEBUG2
    debug2("%d\t%s\n",__LINE__,"Hola");
#endif

#ifdef USE_C99
    debugc99("%d\t%s\n",__LINE__,"Hola");
#endif

    /* Next line will cause a cpp error, since it should end with an argument */
/*  debug("Hola");*/
#ifdef DEBUG1
    debug("Hola\n","");
#endif

#ifdef DEBUG2
    debug2("Hola\n");
#endif

    return(0);
}