gcc-4.6/gcc/testsuite/gcc.dg/mversn4a.c

/* { dg-do compile } */
/* { dg-options "-O2" } */

#include "mversn4.h"

extern int foo ();
extern int bar ();


int extern_func ()
{
  return __builtin_dispatch (featureTest, (void *)foo, (void *) bar);
}