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

[kees at outflux dot net via Gcc-bugs]

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

--- Comment #11 from Kees Cook <kees at outflux dot net> ---
and with a flex array to compare:
https://godbolt.org/z/s9nb4Y7q4