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

[marxin at gcc dot gnu.org]

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

--- Comment #18 from Martin Liška <marxin at gcc dot gnu.org> ---
@Honza: Are you planning to backport it to GCC 8 or may I close it?