typeof-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Test typeof with __asm redirection. */
/* { dg-do compile } */
/* { dg-options "-O2" } */

extern int foo1;
extern int foo1 __asm ("bar1");
int foo1 = 1;

extern int foo2 (int);
extern int foo2 (int) __asm ("bar2");
int foo2 (int x)
{
  return x;
}

extern int foo3;
extern __typeof (foo3) foo3 __asm ("bar3");
int foo3 = 1;

extern int foo4 (int);
extern __typeof (foo4) foo4 __asm ("bar4");
int foo4 (int x)
{
  return x;
}

// { dg-final { scan-assembler-not "foo" } }