https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116428
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |rejects-valid Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Summary|Redeclaration of explicitly |defaulted friend comparison |defaulted comparison |operator and redeclaration |operator makes it undefined |makes it not "defined" Last reconfirmed| |2024-08-20 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. Looks like GCC loses it was defaulted. having a full definition rather than defaulted allows it to work. Also note it is only the friend definition which was defaulted where GCC loses it was defaulted.