QException has an out-of-line destructor in order to pin its vtable. But like any std::exception subclass it's meant to be (and effectively is) copy-constructible and copy-assignable (cf. [exception]/2). Add the missing copy operations, and the default constructor. One may argue that this class should use some other approach since it also has a polymorphic clone() -- for instance disable assignments and make copy constructions protected -- but that ship has sailed. This prevents a Clang warning about the deprecated copies in the presence of a user-declared destructor. Change-Id: I4d8613ade265ea85a5a7e97255b75b7fcf3e5a27 Pick-to: 6.9 6.8 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>