1  /* PR c/20043 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-std=gnu99" } */
       4  
       5  typedef union { int *i; long *l; } U
       6    __attribute__((transparent_union));
       7  
       8  extern void f0 (U);		/* { dg-message "note: previous declaration" } */
       9  extern void f0 (void *);	/* { dg-error "conflicting types" } */
      10  
      11  extern void f1 (U);		/* { dg-message "note: previous declaration" } */
      12  extern void f1 (unsigned long);	/* { dg-error "conflicting types" } */
      13  
      14  extern void f2 (void *);	/* { dg-message "note: previous declaration" } */
      15  extern void f2 (U);		/* { dg-error "conflicting types" } */
      16  
      17  extern void f3 (unsigned long);	/* { dg-message "note: previous declaration" } */
      18  extern void f3 (U);		/* { dg-error "conflicting types" } */