[Bug c++/69953] [5/6/7 Regression] Using lto causes gtkmm/gparted and gtkmm/inkscape compile to fail

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69953

--- Comment #24 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Thanks for confirming. And indeed, I also get a failure with GCC 4.9.4, so that
it is really different. For the reference, I've reported bug 78795.