Fix a set of compilation errors against Qt6

Fixes include
-qmllistproperty uses qsizetype instead of int
-implicit constructor calls that Qt6 marks as explicit
-QEnableIf removed => std::enable_if
-Replace the removed QCoreApplicationPrivate::cloneEvent()
-Conflicting forward declaration for QStringList (comes via qglobal.h)

N.B. after this task the generated (by generator.cpp) code won’t still
compile, and it likely requires more in-depth study how to fix it
=> looks like they relate to the Qt6 property system changes. By
temporarily disabling the violating generated code all unit tests pass
though => needs a followup task to analyze and fix.

Task-number: QTBUG-89832
Change-Id: I9f7d1cd5898b549f243a7df464ca124d29074c46
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

2 files changed, 1 insertions, 2 deletions

diff --git a/tools/qscxmlc/generator.cpp b/tools/qscxmlc/generator.cpp
index a767872..dfedb3b 100644
--- a/tools/qscxmlc/generator.cpp
+++ b/tools/qscxmlc/generator.cpp
@@ -463,7 +463,7 @@ void Generator::generateCode()
 // Build extra array
 //
     QList<QByteArray> extraList;
-    QMultiHash<QByteArray, QByteArray> knownExtraMetaObject = knownGadgets;
+    QMultiHash<QByteArray, QByteArray> knownExtraMetaObject(knownGadgets);
     knownExtraMetaObject.unite(knownQObjectClasses);
 
     for (int i = 0; i < cdef->propertyList.count(); ++i) {
diff --git a/tools/qscxmlc/qscxmlc.h b/tools/qscxmlc/qscxmlc.h
index 81c2427..a909bfe 100644
--- a/tools/qscxmlc/qscxmlc.h
+++ b/tools/qscxmlc/qscxmlc.h
@@ -43,7 +43,6 @@
 #include <QtCore/qglobal.h>
 
 QT_BEGIN_NAMESPACE
-class QStringList;
 
 int run(const QStringList &arguments);