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

[crrodriguez at opensuse dot org via Gcc-bugs]

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

--- Comment #52 from Cristian Rodríguez <crrodriguez at opensuse dot org> ---
Any hope for something that could apply to for example struct sockaddr ? where
the last member is AT LEAST 14 bytes but it size is otherwise unspecified? or
do we need to turn sa_data into a c99 flexible array and add 14 bytes of
padding..?
I don't think that is going to fly with library/kernel maint..