QT qmake instructions in defines?

Question

is it possible to use QT qmake instructions in defines?

I tried to create an QT Plugin Interface class by a define:

#define PLUGIN(NAME) \
class NAME ## Plugin : public QObject, public IPluginInterface \
{ \
Q_OBJECT \
Q_PLUGIN_METADATA(IID "org.my.Plugins" FILE "NAME ## .json") \
Q_INTERFACES(IPluginInterface) \
public: \
virtual ~NAME ## PluginInterface(){} \
NAME ## PluginInterface(){} \
/* implementation of interface */
}; \
NAME ## Plugin NAME ## plugininterface;

but after running qmake and make my program does not load the plugin. Message is: Plugin verification data mismatch

Answer 1

No, it's not (directly) possible, as moc does not do preprocessing. See the relevant section in the Qt docs for moc .

You might get away with it if you run the preprocessor manually (with some hacking not to expand moc -used macros like Q_OBJECT ) and then run moc on the preprocessed file. But that would require significnat support in your buildsystem.