[Bug tree-optimization/105642] [12/13 Regression] error: call to ‘__write_overflow_field’ declared with attribute warning: [-Werror=attribute-warning] since r12-2270-gdddb6ffdc5c25264

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105642

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That seems completely correct.
Try:
int
foo (struct ceph_inode_info *n)
{
  int *i = &n->vfs_inode;
  return __builtin_object_size(i, 1);
}
This returns 4, even GCC 4.6 returned that.
So, __builtin_object_size(i + 1, 1);
which matches what you actually do in the testcase is 0.
Now, with 0 instead of 1 as last argument it is -1 of course in both cases.