[Bug c/114205] Miscompilation: the use of __builtin_object_size cause asan failure.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114205

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't see why you think this is a bug.

-1 returning from __builtin_object_size means it does not know the size.

Without optimization, GCC cannot figure out the size of the object that is
being passed to __builtin_object_size . So at -O0 it aborts.
`-fsanitize=address` will output the error message:
```
AddressSanitizer:DEADLYSIGNAL
=================================================================
==1==ERROR: AddressSanitizer: SEGV on unknown address (pc 0x7f7a49828898 bp
0x7f7a49a1be90 sp 0x7ffc8a097720 T0)

```

When abort is called.

There is nothing wrong here.