wasm: quicktooling build failure

Using the WIP cmake for wasm patch for qtbase, I am trying to build qtdeclarative and getting an odd build error:

src/imports/tooling/.rcc/qmlcache/quicktooling_qml_files_2/Component_qml.cpp:243:105: error: no viable conversion from 'nullptr_t' to 'QList<QMetaType>'
extern const QQmlPrivate::AOTCompiledFunction aotBuiltFunctions[] = {

};}
^~~~~~~
/Users/lpotter/development/builds/qtbase-cmake/include/QtCore/../../../../../depot/qt/qt5/qtbase/src/corelib/tools/qlist.h:100:7: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'nullptr_t' to 'const QList<QMetaType> &' for 1st argument
class QList
^ 

These files are generated from qml files.

I can get it to build if I change the nullptr to QList<QMetaType>() in the generated cpp file.

comments? hints?