tst_qmetatype: fix memleaks

We didn't delete the new'ed up QMetaTypeInterfaces, causing asan to
complain.

Fix by storing them in strong references alongside their users in a
statically-allocated container.

We use shared_ptr to hold them, because QMetaTypeInterface doesn't
have a virtual destructor, so deleting objects of the TypeInfo types
(plural!) derived from QMetaTypeInterface though a pointer to the base
class is UB. The shared_ptr constructor, however, is templated, so it
stores the correct call (~TypeInfo()) in its type-erased deleter.

We can't use std::make_shared(), because that doesn't support
aggregate initialization until C++20, so we manually new up the
TypeInfos.

5.15 is not affected.

Pick-to: 6.3 6.2
Change-Id: Ic7ec88c34e02a9e0dd3421848c0c0885f4756702
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>

0 files changed, 0 insertions, 0 deletions