Q_NAMESPACE and CMake

ligabre

Hello all,

I am trying to use an enum defined inside a namespace in a QML context. The following code works well when I use QMake :

// In file ns.h
namespace NameSpace
{
    Q_NAMESPACE

    enum MyEnum
    {
        ValOne,
        ValTwo
    };
    Q_ENUM_NS(MyEnum)
}

And in main.cpp :

    qmlRegisterUncreatableMetaObject(NameSpace::staticMetaObject,
                                     "com.test", 1, 0,
                                     "Namespace", "Error: only for enums & flags");

But when I use CMake with a default generated CMakeLists.txt from Qt Creator, I have the following error :

main.cpp.obj:-1: erreur : LNK2001: symbole externe non résolu "struct QMetaObject const NameSpace::staticMetaObject" (?staticMetaObject@NameSpace@@3UQMetaObject@@B)

I think I've forgotten to set some variable in CMake in order to be able to use either the Q_NAMESPACE or the qmlRegisterUncreatableMetaType.

Could someone please help me to identify what I'm missing here ?

Thank you very much for your help in advance !

Ligabre

simonschmeisser

@ligabre this is because CMakes automoc does not recognize the Q_NAMESPACE keyword and therefore does not run moc on the header. It was added in CMake 3.10. Until then you have to use qt5_wrap_cpp(moc_file ns.h) and then include ${moc_file} with your target