http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54570
Bug #: 54570
Summary: [4.8 Regression] FAIL: gcc.dg/builtin-object-size-8.c
execution test
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: [email protected]
ReportedBy: [email protected]
I broke it by making early FRE more reliably figure out address equivalences.
extern void abort (void);
union A
{
int a1;
char a2[3];
};
int main()
{
union A *a = __builtin_malloc (212);
if (__builtin_object_size (&a->a1, 1) != 4
|| __builtin_object_size (&a->a2, 1) != 212)
abort ();
return 0;
}
Would break in similar ways with struct { int a[]; } a; and &a vs. &a.a.
