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/* PR c/25801 */
/* { dg-do compile } */
/* { dg-options "-std=c99" } */
int (*a)[];
struct S *s;
union U *u;
enum E *e;
void
f (void)
{
a++; /* { dg-error "increment of pointer to an incomplete type" } */
++a; /* { dg-error "increment of pointer to an incomplete type" } */
a--; /* { dg-error "decrement of pointer to an incomplete type" } */
--a; /* { dg-error "decrement of pointer to an incomplete type" } */
a += 1; /* { dg-error "invalid use of array with unspecified bounds" } */
a -= 1; /* { dg-error "invalid use of array with unspecified bounds" } */
a - a; /* { dg-error "arithmetic on pointer to an incomplete type" } */
s++; /* { dg-error "increment of pointer to an incomplete type" } */
++s; /* { dg-error "increment of pointer to an incomplete type" } */
s--; /* { dg-error "decrement of pointer to an incomplete type" } */
--s; /* { dg-error "decrement of pointer to an incomplete type" } */
s += 1; /* { dg-error "invalid use of undefined type" } */
s -= 1; /* { dg-error "invalid use of undefined type" } */
s - s; /* { dg-error "arithmetic on pointer to an incomplete type" } */
u++; /* { dg-error "increment of pointer to an incomplete type" } */
++u; /* { dg-error "increment of pointer to an incomplete type" } */
u--; /* { dg-error "decrement of pointer to an incomplete type" } */
--u; /* { dg-error "decrement of pointer to an incomplete type" } */
u += 1; /* { dg-error "invalid use of undefined type" } */
u -= 1; /* { dg-error "invalid use of undefined type" } */
u - u; /* { dg-error "arithmetic on pointer to an incomplete type" } */
e++; /* { dg-error "increment of pointer to an incomplete type" } */
++e; /* { dg-error "increment of pointer to an incomplete type" } */
e--; /* { dg-error "decrement of pointer to an incomplete type" } */
--e; /* { dg-error "decrement of pointer to an incomplete type" } */
e += 1; /* { dg-error "invalid use of undefined type" } */
e -= 1; /* { dg-error "invalid use of undefined type" } */
e - e; /* { dg-error "arithmetic on pointer to an incomplete type" } */
}
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