Bug 348798

I've same issue on Arch Linux with Qt 5.5 and all KF5 latest from git master branch (even plasma-desktop, etc.). It happens for all kcms, but seems like everything is working, only this

systemsettings5[6563]: Error loading plugin "kcm_lookandfeel" "The shared library was not found."
                                   Plugin search paths are ("/usr/lib/qt/plugins", "/usr/bin")
                                   The environment variable QT_PLUGIN_PATH might be not correctly set

QT_PLUGIN_PATH is empty and kcm_lookandfeel is located at /usr/lib/qt/plugins/kcms/

I've reproduced the message but I think it's better reported against frameworks-kcmutils. I'm not real eager to disable a global warning to make KCMs less noisy, and the following patch to kcmutils allows it to load new KCMs without a warning (by using KPluginLoader::findPlugin to check which name is most appropriate).

However I'm not entirely sure there's no other issues so I don't want to commit myself.

    diff --git a/src/kcmoduleloader.cpp b/src/kcmoduleloader.cpp
    index 4090ac1..533e892 100644
    --- a/src/kcmoduleloader.cpp
    +++ b/src/kcmoduleloader.cpp
    @@ -89,22 +89,22 @@ KCModule *KCModuleLoader::loadModule(const KCModuleInfo &mod, ErrorReporting rep
             foreach (const QString &arg, args) {
                 args2 << arg;
             }
    -        KCModule *module = mod.service()->createInstance<KCModule>(parent, args2, &error);
    -        if (module) {
    -            return module;
    +
    +        QString pluginName (mod.service()->library());
    +        if (KPluginLoader::findPlugin(pluginName).isEmpty()) {
    +            pluginName.prepend(QLatin1String("kcms/"));
    +        }
    +
    +        KPluginLoader loader(KPluginLoader::findPlugin(pluginName));
    +        KPluginFactory* factory = loader.factory();
    +        if (!factory) {
    +            qWarning() << "Error loading plugin:" << loader.errorString();
             } else {
    -            KPluginLoader loader(KPluginLoader::findPlugin(QLatin1String("kcms/") + mod.service()->library()));
    -            KPluginFactory* factory = loader.factory();
    -            if (!factory) {
    -                qWarning() << "Error loading plugin:" << loader.errorString();
    -            } else {
    -                KQuickAddons::ConfigModule *cm = factory->create<KQuickAddons::ConfigModule >();
    -                if (!cm) {
    -                    qWarning() << "Error creating object from plugin" << loader.fileName();
    -                }
    -                module = new KCModuleQml(cm, parent, args2);
    -                return module;
    +            KQuickAddons::ConfigModule *cm = factory->create<KQuickAddons::ConfigModule >();
    +            if (!cm) {
    +                qWarning() << "Error creating object from plugin" << loader.fileName();
                 }
    +            return new KCModuleQml(cm, parent, args2);
             }
     //#ifndef NDEBUG
             {

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