moc: Generate qt_static_metacall for creatable-only gadgets

Prior to this, moc would not generate the function unless the
gadget class had a property or a non-constructor invokable.

Change-Id: Ic020ea5f8f59702f5e9e194a46e26850e53e5cfe
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/tests/auto/tools/moc/tst_moc.cpp b/tests/auto/tools/moc/tst_moc.cpp
index 7fa5de3377..8bef678af9 100644
--- a/tests/auto/tools/moc/tst_moc.cpp
+++ b/tests/auto/tools/moc/tst_moc.cpp
@@ -90,13 +90,15 @@ struct QTBUG_31218_Derived : QTBUG_31218<-1<0> {};
 class CreatableGadget
 {
     Q_GADGET
-    Q_PROPERTY(int a MEMBER a)
 public:
-    Q_INVOKABLE CreatableGadget() : a(0xdeadbeef) { }
-
-    int a;
+    Q_INVOKABLE CreatableGadget()
+    {
+        CreatableGadget::qt_static_metacall((QObject*)this, QMetaObject::ReadProperty, -1, Q_NULLPTR);
+    }
 };
 
+CreatableGadget creatableGadget; // Force the compiler to use the constructor
+
 struct MyStruct {};
 struct MyStruct2 {};