https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87905
--- Comment #1 from Raymond Jennings <shentino at gmail dot com> --- just do g++ -flto *.cpp
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87905
--- Comment #1 from Raymond Jennings <shentino at gmail dot com> --- just do g++ -flto *.cpp