https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113208
--- Comment #23 from Richard Biener <rguenth at gcc dot gnu.org> --- So we have _ZN6vectorI12QualityValueEC{2,5}ERKS1_ so C2 vs C5, whatever that exactly means. When not using -flto and not optimizing the comdat group in both objects is COMDAT group section [ 2] `.group' [_ZN6vectorI12QualityValueEC5ERKS1_] contains 2 sections: [Index] Name [ 9] .text._ZN6vectorI12QualityValueEC2ERKS1_ [ 10] .rela.text._ZN6vectorI12QualityValueEC2ERKS1_ the comdat group doesn't survive to the non-LTO object when optimizing. I'm a bit lost as to where to look for the error. Honza?