import QtQuick 2.0
import QtQuick.Window 2.2

Window {
    id: win
    visible: true
    width: 800
    height: 600

    Component {
        id: cmp
        Rectangle {
            color:"red"
            height: win.height
        }
    }
    Component.onCompleted: {
        cmp.incubateObject(contentItem, {width: Qt.binding(function(){ return win.width })})
    }
}

1  QV4::CppStackFrame::lineNumber               qv4engine.cpp             786  0x7ffff7372fc4 
2  QV4::QQmlBindingFunction::currentLocation    qqmlbuiltinfunctions.cpp  1358 0x7ffff7567d8a 
3  QV4::QObjectWrapper::setProperty             qv4qobjectwrapper.cpp     466  0x7ffff744c3cb 
4  QV4::QObjectWrapper::setQmlProperty          qv4qobjectwrapper.cpp     429  0x7ffff744d83e 
5  QV4::QObjectWrapper::put                     qv4qobjectwrapper.cpp     706  0x7ffff744d922 
6  QV4::Object::put                             qv4object_p.h             370  0x7ffff74ae37c 
7  QQmlComponentPrivate::setInitialProperties   qqmlcomponent.cpp         1255 0x7ffff74ae37c 
8  QV4::QmlIncubatorObject::setInitialState     qqmlcomponent.cpp         1552 0x7ffff74af3d5 
9  QQmlComponentIncubator::setInitialState      qqmlcomponent.cpp         1152 0x7ffff74b12a2 
10 QQmlIncubatorPrivate::incubate               qqmlincubator.cpp         318  0x7ffff74b29a7 
11 QQmlIncubationController::incubateFor        qqmlincubator.cpp         389  0x7ffff74b339e 
12 QQuickWindowIncubationController::incubate   qquickwindow.cpp          160  0x7fffc794f580 
13 QQuickWindowIncubationController::timerEvent qquickwindow.cpp          143  0x7fffc794f580 
14 QObject::event                               qobject.cpp               1232 0x7ffff6f52ba3 
15 QApplicationPrivate::notify_helper           qapplication.cpp          3713 0x7ffff783e2d8 
16 QApplication::notify                         qapplication.cpp          3085 0x7ffff7845cc2 
17 QCoreApplication::notifyInternal2            qcoreapplication.cpp      1048 0x7ffff6f214cc 
18 QCoreApplication::sendEvent                  qcoreapplication.h        234  0x7ffff6f7d494 
19 QTimerInfoList::activateTimers               qtimerinfo_unix.cpp       643  0x7ffff6f7d494 
20 timerSourceDispatch                          qeventdispatcher_glib.cpp 182  0x7ffff6f7dcc9 
21 g_main_context_dispatch                                                     0x7ffff479e197 
22 ??                                                                          0x7ffff479e3f0 
23 g_main_context_iteration                                                    0x7ffff479e49c 
24 QEventDispatcherGlib::processEvents          qeventdispatcher_glib.cpp 423  0x7ffff6f7e0b5 
25 QPAEventDispatcherGlib::processEvents        qeventdispatcher_glib.cpp 69   0x7ffff7efae1b 
26 QEventLoop::processEvents                    qeventloop.cpp            136  0x7ffff6f1f403 
27 QEventLoop::exec                             qeventloop.cpp            214  0x7ffff6f1f87c 
28 QCoreApplication::exec                       qcoreapplication.cpp      1336 0x7ffff6f294b2 
29 QGuiApplication::exec                        qguiapplication.cpp       1750 0x7ffff5e92bba 
30 QApplication::exec                           qapplication.cpp          2898 0x7ffff783e1b3 
31 main                                                                        0x400d56