Viewing file:  alias-16.c (2.27 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-Wstrict-aliasing=1 -fstrict-aliasing" } */
struct incomplete;
struct s1 { int i; };
struct s2 { double d; };
void
f (int *i, double *d, struct s1 *s1, struct s2 *s2, char *c)
{
(char *) i;
(char *) d;
(char *) s1;
(char *) s2;
(char *) c;
(int *) i;
(int *) d; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(int *) s1; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(int *) s2; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(int *) c;
(double *) i; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(double *) d;
(double *) s1; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(double *) s2; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(double *) c;
(struct incomplete *) i; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct incomplete *) d; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct incomplete *) s1; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct incomplete *) s2; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct incomplete *) c; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct s1 *) i; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct s1 *) d; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct s1 *) s1;
(struct s1 *) s2; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct s1 *) c;
(struct s2 *) i; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct s2 *) d; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct s2 *) s1; /* { dg-warning "dereferencing type-punned pointer might break strict-aliasing rules" } */
(struct s2 *) s2;
(struct s2 *) c;
}
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