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