https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123579
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > Well the code works without an explicit on the copy constructor also, GCC > does not produce a call to it; rather it is just requiring it to exist. Well rather GCC is requiring the copy constructor not to be explicit.
