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
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 793309693aac24e7f88fc225408d92def638996e)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 37a553a3a51cfe58b73083432634ba4235401b10)
5e75ef6d8b