[Bug c/101836] __builtin_object_size(P->M, 1) where M is an array and the last member of a struct fails

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-10-13
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
                 CC|                            |msebor at gcc dot gnu.org,
                   |                            |siddhesh at redhat dot com

--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
I'm not sure how feasible it is to change __builtin_object_size or to add an
option to control this behavior but I agree that treating all trailing arrays
as flexible array members is overly permissive and unhelpful (GCC warnings like
-Warray-bounds are stricter and treat only zero and one-element arrays that
way).  Let me confirm this request and CC Siddhesh who just submitted a patch
for __builtin_dynamic_object_size.  Maybe that's a way toward something
stricter.