Store the is-a QObject fact with the metatype declaration.

This is a source incompatible change for Q_DECLARE_METATYPE(T*),
which now requires T to be fully defined.

The consequences of this are:
 * Forward declared types can no longer be declared as a metatype.
     (though this is a very uncommon thing to do).

There is a trivial workaround where necessary.

Change-Id: Id74c40088b8c0b466fcd7c55abd616f69acc82c8
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp b/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
index f8fa92e244..f40b1eae0b 100644
--- a/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
+++ b/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
@@ -3324,6 +3324,11 @@ void tst_QVariant::colorInteger()
 }
 
 class Forward;
+QT_BEGIN_NAMESPACE namespace QtPrivate {
+template <> struct IsPointerToTypeDerivedFromQObject<Forward*> {
+    enum { Value = false };
+};
+} QT_END_NAMESPACE
 Q_DECLARE_METATYPE(Forward*);
 
 void tst_QVariant::forwardDeclare()