/* Test program to display a possible GCC bug.
 * Submitted by Richard Mitton (richard.mitton@bigfoot.com)
 * 15th August 2000.
 *
 * Using a DJGPP system (latest version, v2.03), Windows 98.
 * (latest version, gcc 2.95.2 19991024 release):
 *
 * To make bug happen: gcc -S -O -fomit-frame-pointer test.c -o test.s
 * To make bug not happen, remove either -O or -fomit-frame-pointer.
 *
 * The bug happens when GCC throws away the result from GetValue().
 */

#include <stdio.h>

/* Just some functions to demonstrate */
unsigned char GetValue(void);
unsigned char EmptyFunction(void);
void Print(int a);
void DoNothing(int b);

int main(void)
{
   unsigned char foo, bar, flag;

   /* IMPORTANT PART!
    * This should print GetValue()+1.
    * Since GetValue always returns 10, it should print 11.
    */
   foo = GetValue() + 1;
   Print(foo);

   /* From here on is just misc code, but if I take any of it out then
    * the bug doesn't happen...
    */

   foo = EmptyFunction();
   bar = EmptyFunction();
   flag = foo;

   DoNothing(bar);
   DoNothing(bar);

   if (!flag) foo = 1;
   return 0;
}

/* Always return 10 */
unsigned char GetValue(void)
{
   return 10;
}

unsigned char EmptyFunction(void)
{
   return 0;
}

void Print(int a)
{
   printf("Answer is %i, but should be 11 (i.e. 10+1).\n", a);
}

void DoNothing(int b)
{
}