[Bug lto/89358] [8 Regression] Combining -std=c++14 and -std=c++17 objects gives ODR warnings

[rogero at howzatt dot demon.co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89358

--- Comment #23 from Roger Orr <rogero at howzatt dot demon.co.uk> ---
That's good to hear -- thank you very much!