--warning: treat unused variables so we are not warned about them

src/plugins/platforms/drm/drm_backend.cpp

@@ -226,7 +226,7 @@ void DrmBackend::handleUdevEvent()
 
         if (device->action() == QStringLiteral("add")) {
             if (m_gpus.isEmpty() || !primaryGpu()->useEglStreams()) {
-                if (const auto &gpu = addGpu(device->devNode())) {
+                if (addGpu(device->devNode())) {
                     updateOutputs();
                     updateCursor();
                 }

src/plugins/platforms/wayland/egl_wayland_backend.cpp

@@ -377,6 +377,7 @@ QRegion EglWaylandBackend::beginFrame(int screenId)
 
 void EglWaylandBackend::endFrame(int screenId, const QRegion &renderedRegion, const QRegion &damagedRegion)
 {
+    Q_UNUSED(renderedRegion);
     EglWaylandOutput *output = m_outputs[screenId];
     QRegion damage = damagedRegion.intersected(output->m_waylandOutput->geometry());
     presentOnSurface(output, damage);

src/scripting/genericscriptedconfig.cpp

@@ -41,6 +41,7 @@ GenericScriptedConfig::GenericScriptedConfig(const QString &componentName, const
     , m_packageName(keyword)
     , m_translator(new KLocalizedTranslator(this))
 {
+    Q_UNUSED(componentName);
     QCoreApplication::instance()->installTranslator(m_translator);
 }