Hi,

   QCommandLineOption pluginOpt(QStringList() << "p"
                                              << "plugin",
                                tr("path to the plugin"),
                                tr("path"));

Will say in --help that --plugin <plugin> is accepted while it actually does not work.
It only accepts --plugin=<plugin>.

Either the content of --help needs to be fixed or --plugin <plugins> needs to work.

You can see how I used it here: https://github.com/free-audio/clap-host/blob/main/host/application.cc#L71

Regards,
Alex