Mark unused parameters with Q_UNUSED

This prevents compiler warnings on less common branches of certain
ifdefs.

Change-Id: I89bae68491151b21cf6887a854cc4c9f68838cf9
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

src/corelib/tools/qharfbuzz.cpp

@@ -65,6 +65,9 @@ HB_UChar16 HB_GetMirroredChar(HB_UChar16 ch)
 void (*HB_Library_Resolve(const char *library, int version, const char *symbol))()
 {
 #ifdef QT_NO_LIBRARY
+    Q_UNUSED(library);
+    Q_UNUSED(version);
+    Q_UNUSED(symbol);
     return 0;
 #else
     return QLibrary::resolve(QLatin1String(library), version, symbol);

src/gui/kernel/qguiapplication.cpp

@@ -1346,6 +1346,8 @@ void QGuiApplicationPrivate::init()
             qCritical() << "Library qttestability load failed:" << testLib.errorString();
         }
     }
+#else
+    Q_UNUSED(loadTestability);
 #endif // QT_NO_LIBRARY
 }
 

src/gui/kernel/qplatformintegrationfactory.cpp

@@ -72,6 +72,12 @@ QPlatformIntegration *QPlatformIntegrationFactory::create(const QString &platfor
     }
     if (QPlatformIntegration *ret = loadIntegration(loader(), platform, paramList, argc, argv))
         return ret;
+#else
+    Q_UNUSED(platform);
+    Q_UNUSED(paramList);
+    Q_UNUSED(argc);
+    Q_UNUSED(argv);
+    Q_UNUSED(platformPluginPath);
 #endif
     return 0;
 }
@@ -102,6 +108,7 @@ QStringList QPlatformIntegrationFactory::keys(const QString &platformPluginPath)
     list.append(loader()->keyMap().values());
     return list;
 #else
+    Q_UNUSED(platformPluginPath);
     return QStringList();
 #endif
 }

src/gui/kernel/qplatformthemefactory.cpp

@@ -63,6 +63,9 @@ QPlatformTheme *QPlatformThemeFactory::create(const QString& key, const QString
     }
     if (QPlatformTheme *ret = qLoadPlugin1<QPlatformTheme, QPlatformThemePlugin>(loader(), platform, paramList))
            return ret;
+#else
+    Q_UNUSED(key);
+    Q_UNUSED(platformPluginPath);
 #endif
     return 0;
 }
@@ -93,6 +96,7 @@ QStringList QPlatformThemeFactory::keys(const QString &platformPluginPath)
     list += loader()->keyMap().values();
     return list;
 #else
+    Q_UNUSED(platformPluginPath);
     return QStringList();
 #endif
 }

src/plugins/platforms/eglfs/qeglfsdeviceintegration.cpp

@@ -99,6 +99,7 @@ QStringList QEGLDeviceIntegrationFactory::keys(const QString &pluginPath)
     qCDebug(qLcEglDevDebug) << "EGL device integration plugin keys:" << list;
     return list;
 #else
+    Q_UNUSED(pluginPath);
     return QStringList();
 #endif
 }
@@ -117,6 +118,9 @@ QEGLDeviceIntegration *QEGLDeviceIntegrationFactory::create(const QString &key,
         qCDebug(qLcEglDevDebug) << "Using EGL device integration" << key;
     else
         qCWarning(qLcEglDevDebug) << "Failed to load EGL device integration" << key;
+#else
+    Q_UNUSED(key);
+    Q_UNUSED(pluginPath);
 #endif
     return integration;
 }

src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationfactory.cpp

@@ -78,6 +78,7 @@ QStringList QXcbGlIntegrationFactory::keys(const QString &pluginPath)
     list.append(loader()->keyMap().values());
     return list;
 #else
+    Q_UNUSED(pluginPath);
     return QStringList();
 #endif
 }
@@ -93,6 +94,9 @@ QXcbGlIntegration *QXcbGlIntegrationFactory::create(const QString &platform, con
     }
     if (QXcbGlIntegration *ret = loadIntegration(loader(), platform))
         return ret;
+#else
+    Q_UNUSED(platform);
+    Q_UNUSED(pluginPath);
 #endif
     return Q_NULLPTR;
 }

src/widgets/kernel/qwidget.cpp

@@ -9730,6 +9730,8 @@ void QWidget::setInputMethodHints(Qt::InputMethodHints hints)
     d->imHints = hints;
     if (this == QGuiApplication::focusObject())
         QGuiApplication::inputMethod()->update(Qt::ImHints);
+#else
+    Q_UNUSED(hints);
 #endif //QT_NO_IM
 }