[Bug c/108896] provide "element_count" attribute to give more context to __builtin_dynamic_object_size() and -fsanitize=bounds

[qinzhao at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896

--- Comment #12 from qinzhao at gcc dot gnu.org ---
(In reply to Martin Uecker from comment #9)
>
> Here, we want to use a member of the struct as a size 
> expression. This could work equally at function and file scope.
> But the semantics need to be worked out.  I have started to work
> on a patch for GCC a couple of weeks ago using PLACEHOLDER_EXPR,
> but did not get very far.
what kind of semantics your patch will support?