When avoiding the protected hack, the generated wrapper headers need to be included to generate casts to the wrapper classes. This was previously done by generating the entire class declaration into the header, omitting its extra includes, which causes clashes in CMake UNITY_BUILD (jumbo) builds and is a violation of the ODR rule. Improve this by generating include statements for inherited wrapper headers of the current module. For classes from other modules, generate the declarations as before, as wrapper headers are not installed. Task-number: PYSIDE-2155 Task-number: PYSIDE-500 Change-Id: Ib7caa3f49901090d7d94274018e04ccde2ebfdf9 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Shyamnath Premnadh <Shyamnath.Premnadh@qt.io> Reviewed-by: Christian Tismer <tismer@stackless.com>