[Bug c++/81716] Bogus -Wlto warning with forward-declared pointers

[sgunderson at bigfoot dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81716

--- Comment #2 from sgunderson at bigfoot dot com ---
Still there in:

gcc version 8.0.0 20171017 (experimental) [trunk revision 253812] (Debian
20171017-1)