42 lines
621 B
C
42 lines
621 B
C
/* { dg-do compile } */
|
|
/* { dg-options "-O2 -Wall" } */
|
|
|
|
struct g { long a; };
|
|
unsigned long f(struct g *a) { return *(unsigned long *)&a->a; }
|
|
|
|
struct A
|
|
{
|
|
void *a;
|
|
};
|
|
|
|
int g(const struct A *x, long *y)
|
|
{
|
|
typedef long __attribute__ ((may_alias)) long_a;
|
|
*y = *(const long_a *) (&x->a);
|
|
return 1;
|
|
}
|
|
|
|
void *a;
|
|
|
|
int
|
|
f0 (long *y)
|
|
{
|
|
*y = *(const long *) &a; /* { dg-warning "will break" } */
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
f1 (long *y)
|
|
{
|
|
typedef long __attribute__ ((may_alias)) long_a;
|
|
*y = *(const long_a *) &a;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
f2 (long *y)
|
|
{
|
|
*y = *(const long *) &a; /* { dg-warning "will break" } */
|
|
return 1;
|
|
}
|