https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101978
--- Comment #1 from pavlick <ispavlick at gmail dot com> ---
Apparently this is due to condition_variable, if it is commented
//while (! cv.wait_for(lck, 1s, [&sh_ptr](){
// return sh_ptr->processed == true;}) && true);
then there are no warnings
