kwin compile broken with qt5.4

[Martin Gräßlin]

On Monday 18 August 2014 10:56:19 Treeve Jelbert wrote:
> FAILED: /var/lib/sorcery/build/c++   -DKCOREADDONS_LIB -
> DKDE_DEFAULT_DEBUG_AREA=1212 -DQT_CONCURRENT_LIB -
> DQT_CORE_LIB -DQT_DBUS_LIB -DQT_DISABLE_DEPRECATED_BEFORE=0 -DQT_GUI_LIB -
> DQT_NETWORK_LIB -DQT_NO_DEBUG -D
> QT_QML_LIB -DQT_QUICK_LIB -DQT_SCRIPT_LIB -DQT_WIDGETS_LIB
> -DQT_X11EXTRAS_LIB -DQT_XML_LIB -D_GNU_SOURCE -
> D_LARGEFILE64_SOURCE -D_XOPEN_SOURCE=500 -Dkwin_EXPORTS -march=native -
> mtune=native -m64 -pipe -ffast-math
>  -funroll-loops  -std=c++0x -fno-exceptions -Wall -Wextra -Wcast-align
> -Wchar- subscripts -Wformat-security
>  -Wno-long-long -Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-
> virtual -Werror=return-type -O3 -D
> NDEBUG -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -I. -
> I/var/git/qt5/plasma-ws/kwin -I/var/git/qt5/plasma-ws/kwin/tabbox -
> I/var/git/qt5/plasma-ws/kwin/effects -I/var/git/qt5/plasma-
> ws/kwin/libkdecorations -I/var/git/qt5/plasma-ws/kwin/libkwineffects -
> Ilibkwineffects -Ilibkdecorations -Ieffects -isystem /opt/qt5/include
> -isystem /opt/qt5/include/QtWidgets -isystem /opt/qt5/include/QtGui
> -isystem /opt/qt5/include/QtCore -isystem /opt/qt5/mkspecs/linux-g++
> -isystem /opt/qt5/include/KF5/KConfigCore -isystem /opt/qt5/include/KF5
> -isystem /opt/qt5/include/KF5/KService -isystem
> /opt/qt5/include/KF5/KCoreAddons - isystem
> /opt/qt5/include/KF5/KWindowSystem -isystem /opt/qt5/include/QtDBus -
> isystem /opt/qt5/include/QtX11Extras -isystem /opt/qt5/include/QtConcurrent
> - isystem /opt/qt5/include/QtQuick -isystem /opt/qt5/include/QtQml -
> I/opt/qt5/include/QtNetwork -isystem /opt/qt5/include/QtScript -isystem
> /opt/qt5/include/KF5/KConfigWidgets -isystem /opt/qt5/include/KF5/KCodecs -
> isystem /opt/qt5/include/KF5/KWidgetsAddons -isystem
> /opt/qt5/include/KF5/KConfigGui -I/opt/qt5/include/QtXml -isystem
> /opt/qt5/include/KF5/KAuth -isystem /opt/qt5/include/KF5/KCrash -isystem
> /opt/qt5/include/KF5/KGlobalAccel -isystem /opt/qt5/include/KF5/KI18n
> -isystem /opt/qt5/include/KF5/KNotifications -isystem
> /opt/qt5/include/KF5/Plasma - isystem /opt/qt5/include/KF5/KActivities -MMD
> -MT
> CMakeFiles/kwin.dir/scripting/scripting.cpp.o -MF
> CMakeFiles/kwin.dir/scripting/scripting.cpp.o.d -o
> CMakeFiles/kwin.dir/scripting/scripting.cpp.o -c /var/git/qt5/plasma-
> ws/kwin/scripting/scripting.cpp
> /var/git/qt5/plasma-ws/kwin/scripting/scripting.cpp: In member function
> 'LoadScriptList KWin::Scripting::queryScriptsToLoad()':
> /var/git/qt5/plasma-ws/kwin/scripting/scripting.cpp:669:39: warning:
> 'KPluginInfo::KPluginInfo(KService::Ptr)' is deprecated (declared at
> /opt/qt5/include/KF5/KService/kplugininfo.h:114) [-Wdeprecated-declarations]
> KPluginInfo plugininfo(service);
>                                        ^
> In file included from /opt/qt5/include/QtQml/qqml.h:45:0,
>                  from /opt/qt5/include/QtQuick/qquickitem.h:46,
>                  from /opt/qt5/include/QtQuick/qquickpainteditem.h:45,
>                  from /opt/qt5/include/QtQuick/QQuickPaintedItem:1,
>                  from /var/git/qt5/plasma-
> ws/kwin/scripting/../thumbnailitem.h:26,
>                  from
> /var/git/qt5/plasma-ws/kwin/scripting/scripting.cpp:31:
> /opt/qt5/include/QtQml/qqmlprivate.h: In instantiation of 'static QObject*
> QQmlPrivate::AttachedPropertySelector<T, 1>::attachedProperties(QObject*)
> [with T = QQuickWindow]':
> /opt/qt5/include/QtQml/qqmlprivate.h:188:20:   required from 'static
> QObject* (* QQmlPrivate::AttachedPropertySelector<T, 1>::func())(QObject*)
> [with T = QQuickWindow; QQmlAttachedPropertiesFunc = QObject*
> (*)(QObject*)]' /opt/qt5/include/QtQml/qqmlprivate.h:198:130:   required
> from 'QObject* (* QQmlPrivate::attachedPropertiesFunc())(QObject*) [with T
> = QQuickWindow; QQmlAttachedPropertiesFunc = QObject* (*)(QObject*)]'
> /opt/qt5/include/QtQml/qqml.h:121:48:   required from 'int qmlRegisterType()
> [with T = QQuickWindow]'
> /var/git/qt5/plasma-ws/kwin/scripting/scripting.cpp:623:35:   required from
> here
> /opt/qt5/include/QtQml/qqmlprivate.h:180:48: error: cannot convert
> 'QQuickWindowAttached*' to 'QObject*' in return
>              return T::qmlAttachedProperties(obj);
>                                                 ^
> /opt/qt5/include/QtQml/qqmlprivate.h: In instantiation of 'static const
> QMetaObject* QQmlPrivate::AttachedPropertySelector<T,
> 1>::attachedPropertiesMetaObject(ReturnType* (*)(QObject*)) [with ReturnType
> = QQuickWindowAttached; T = QQuickWindow]':
> /opt/qt5/include/QtQml/qqmlprivate.h:191:74:   required from 'static const
> QMetaObject* QQmlPrivate::AttachedPropertySelector<T, 1>::metaObject() [with
> T = QQuickWindow]'
> /opt/qt5/include/QtQml/qqmlprivate.h:204:136:   required from 'const
> QMetaObject* QQmlPrivate::attachedPropertiesMetaObject() [with T =
> QQuickWindow]'
> /opt/qt5/include/QtQml/qqml.h:122:54:   required from 'int qmlRegisterType()
> [with T = QQuickWindow]'
> /var/git/qt5/plasma-ws/kwin/scripting/scripting.cpp:623:35:   required from
> here
> 
> :             return &ReturnType::staticMetaObject;
> 
>                     ^
> ninja: build stopped: subcommand failed.

This has already reported as bug 338277 [1]. As stated in the bug report: this 
needs to be reported upstream. Qt should not fail the compilation of valid and 
existing code.

I personally cannot do anything about it, as I don't have a Qt 5.4 build yet.

Cheers
Martin

[1] https://bugs.kde.org/show_bug.cgi?id=338277
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