gcc/testsuite/gcc.dg/compat/scalar-by-value-1_main.c

/* Test passing scalars by value.  This test includes scalar types that
   are supported by va_arg.  */

extern void scalar_by_value_1_x (void);
extern void exit (int);
int fails;

int
main ()
{
  scalar_by_value_1_x ();
  exit (0);
}