https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96848
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2021-08-17 Ever confirmed|0 |1 Depends on| |85251 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. I suspect PR 85251 is the underlying issue though, GCC loses explicit even in the unconditional case. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85251 [Bug 85251] Using declaration for base class constructor looses explicit.