[Bug c++/125920] option -flto=auto breaks the program behaviour

[gustavo at ugr dot es via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125920

--- Comment #2 from gustavo <gustavo at ugr dot es> ---
Created attachment 64817
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64817&action=edit
makefile