[Bug lto/66029] Build error compiling gcc5.1 using LTO

[t at sharklasers dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66029

--- Comment #1 from JD <t at sharklasers dot com> ---
I compiled with used:
-O3 -flto -fuse-linker-plugin -fno-fat-lto-objects

and tried to link with:
-flto=4 -O3 -fuse-linker-plugin