diff --git a/autotests/integration/CMakeLists.txt b/autotests/integration/CMakeLists.txt
--- a/autotests/integration/CMakeLists.txt
+++ b/autotests/integration/CMakeLists.txt
@@ -1,6 +1,6 @@
 add_subdirectory(helper)
 
-add_library(KWinIntegrationTestFramework STATIC kwin_wayland_test.cpp test_helpers.cpp ${kwin_XWAYLAND_SRCS})
+add_library(KWinIntegrationTestFramework STATIC kwin_wayland_test.cpp test_helpers.cpp generic_scene_opengl_test.cpp ${kwin_XWAYLAND_SRCS})
 target_link_libraries(KWinIntegrationTestFramework kwin Qt5::Test)
 
 function(integrationTest)
@@ -36,9 +36,9 @@
 integrationTest(WAYLAND_ONLY NAME testXdgShellClient SRCS xdgshellclient_test.cpp)
 integrationTest(WAYLAND_ONLY NAME testDontCrashNoBorder SRCS dont_crash_no_border.cpp)
 integrationTest(NAME testXwaylandSelections SRCS xwayland_selections_test.cpp)
-integrationTest(WAYLAND_ONLY NAME testSceneOpenGL SRCS scene_opengl_test.cpp generic_scene_opengl_test.cpp)
+integrationTest(WAYLAND_ONLY NAME testSceneOpenGL SRCS scene_opengl_test.cpp )
 integrationTest(WAYLAND_ONLY NAME testSceneOpenGLShadow SRCS scene_opengl_shadow_test.cpp)
-integrationTest(WAYLAND_ONLY NAME testSceneOpenGLES SRCS scene_opengl_es_test.cpp generic_scene_opengl_test.cpp)
+integrationTest(WAYLAND_ONLY NAME testSceneOpenGLES SRCS scene_opengl_es_test.cpp )
 integrationTest(WAYLAND_ONLY NAME testNoXdgRuntimeDir SRCS no_xdg_runtime_dir_test.cpp)
 integrationTest(WAYLAND_ONLY NAME testScreenChanges SRCS screen_changes_test.cpp)
 integrationTest(NAME testModiferOnlyShortcut SRCS modifier_only_shortcut_test.cpp)
@@ -57,7 +57,7 @@
 integrationTest(WAYLAND_ONLY NAME testDontCrashCursorPhysicalSizeEmpty SRCS dont_crash_cursor_physical_size_empty.cpp)
 integrationTest(WAYLAND_ONLY NAME testDontCrashReinitializeCompositor SRCS dont_crash_reinitialize_compositor.cpp)
 integrationTest(WAYLAND_ONLY NAME testNoGlobalShortcuts SRCS no_global_shortcuts_test.cpp)
-integrationTest(WAYLAND_ONLY NAME testBufferSizeChange SRCS buffer_size_change_test.cpp generic_scene_opengl_test.cpp)
+integrationTest(WAYLAND_ONLY NAME testBufferSizeChange SRCS buffer_size_change_test.cpp )
 integrationTest(WAYLAND_ONLY NAME testPlacement SRCS placement_test.cpp)
 integrationTest(WAYLAND_ONLY NAME testActivation SRCS activation_test.cpp)
 
diff --git a/autotests/libinput/CMakeLists.txt b/autotests/libinput/CMakeLists.txt
--- a/autotests/libinput/CMakeLists.txt
+++ b/autotests/libinput/CMakeLists.txt
@@ -1,99 +1,71 @@
 include_directories(${Libinput_INCLUDE_DIRS})
 include_directories(${UDEV_INCLUDE_DIR})
+
+add_library(LibInputTestObjects OBJECT ../../libinput/device.cpp ../../libinput/events.cpp mock_libinput.cpp)
+target_link_libraries(LibInputTestObjects Qt5::Test Qt5::Widgets Qt5::DBus Qt5::Gui KF5::ConfigCore)
+
 ########################################################
 # Test Devices
 ########################################################
-set(testLibinputDevice_SRCS device_test.cpp mock_libinput.cpp ../../libinput/device.cpp )
-add_executable(testLibinputDevice ${testLibinputDevice_SRCS})
-target_link_libraries(testLibinputDevice Qt5::Test Qt5::DBus Qt5::Gui KF5::ConfigCore)
+add_executable(testLibinputDevice device_test.cpp)
+target_link_libraries(testLibinputDevice Qt5::Test Qt5::DBus Qt5::Gui KF5::ConfigCore LibInputTestObjects)
 add_test(NAME kwin-testLibinputDevice COMMAND testLibinputDevice)
 ecm_mark_as_test(testLibinputDevice)
 
 ########################################################
 # Test Key Event
 ########################################################
-set(testLibinputKeyEvent_SRCS
-    ../../libinput/device.cpp
-    ../../libinput/events.cpp
-    key_event_test.cpp
-    mock_libinput.cpp
-)
-add_executable(testLibinputKeyEvent ${testLibinputKeyEvent_SRCS})
-target_link_libraries(testLibinputKeyEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore)
+add_executable(testLibinputKeyEvent key_event_test.cpp)
+target_link_libraries(testLibinputKeyEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore LibInputTestObjects)
 add_test(NAME kwin-testLibinputKeyEvent COMMAND testLibinputKeyEvent)
 ecm_mark_as_test(testLibinputKeyEvent)
 
 ########################################################
 # Test Pointer Event
 ########################################################
-set(testLibinputPointerEvent_SRCS
-    ../../libinput/device.cpp
-    ../../libinput/events.cpp
-    mock_libinput.cpp
-    pointer_event_test.cpp
-)
-add_executable(testLibinputPointerEvent ${testLibinputPointerEvent_SRCS})
-target_link_libraries(testLibinputPointerEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore)
+add_executable(testLibinputPointerEvent pointer_event_test.cpp)
+target_link_libraries(testLibinputPointerEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore LibInputTestObjects)
 add_test(NAME kwin-testLibinputPointerEvent COMMAND testLibinputPointerEvent)
 ecm_mark_as_test(testLibinputPointerEvent)
 
 ########################################################
 # Test Touch Event
 ########################################################
-set(testLibinputTouchEvent_SRCS
-    ../../libinput/device.cpp
-    ../../libinput/events.cpp
-    mock_libinput.cpp
-    touch_event_test.cpp
-)
-add_executable(testLibinputTouchEvent ${testLibinputTouchEvent_SRCS})
-target_link_libraries(testLibinputTouchEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore)
+add_executable(testLibinputTouchEvent touch_event_test.cpp)
+target_link_libraries(testLibinputTouchEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore LibInputTestObjects)
 add_test(NAME kwin-testLibinputTouchEvent COMMAND testLibinputTouchEvent)
 ecm_mark_as_test(testLibinputTouchEvent)
 
 ########################################################
 # Test Gesture Event
 ########################################################
-set(testLibinputGestureEvent_SRCS
-    ../../libinput/device.cpp
-    ../../libinput/events.cpp
-    gesture_event_test.cpp
-    mock_libinput.cpp
-)
-add_executable(testLibinputGestureEvent ${testLibinputGestureEvent_SRCS})
-target_link_libraries(testLibinputGestureEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore)
+add_executable(testLibinputGestureEvent gesture_event_test.cpp)
+target_link_libraries(testLibinputGestureEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore LibInputTestObjects)
 add_test(NAME kwin-testLibinputGestureEvent COMMAND testLibinputGestureEvent)
 ecm_mark_as_test(testLibinputGestureEvent)
 
 ########################################################
 # Test Switch Event
 ########################################################
-set(testLibinputSwitchEvent_SRCS
-        ../../libinput/device.cpp
-        ../../libinput/events.cpp
-        mock_libinput.cpp
-        switch_event_test.cpp
-)
-add_executable(testLibinputSwitchEvent ${testLibinputSwitchEvent_SRCS})
-target_link_libraries(testLibinputSwitchEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore)
+add_executable(testLibinputSwitchEvent switch_event_test.cpp)
+target_link_libraries(testLibinputSwitchEvent Qt5::Test Qt5::DBus Qt5::Widgets KF5::ConfigCore LibInputTestObjects)
 add_test(NAME kwin-testLibinputSwitchEvent COMMAND testLibinputSwitchEvent)
 ecm_mark_as_test(testLibinputSwitchEvent)
 
 ########################################################
 # Test Context
 ########################################################
 set(testLibinputContext_SRCS
         ../../libinput/context.cpp
-        ../../libinput/device.cpp
-        ../../libinput/events.cpp
         ../../libinput/libinput_logging.cpp
         ../../logind.cpp
         context_test.cpp
-        mock_libinput.cpp
         mock_udev.cpp
 )
 add_executable(testLibinputContext ${testLibinputContext_SRCS})
 target_link_libraries(testLibinputContext
+    LibInputTestObjects
+
     Qt5::DBus
     Qt5::Test
     Qt5::Widgets
@@ -107,8 +79,7 @@
 ########################################################
 # Test Input Events
 ########################################################
-set(testInputEvents_SRCS input_event_test.cpp mock_libinput.cpp ../../libinput/device.cpp ../../input_event.cpp)
-add_executable(testInputEvents ${testInputEvents_SRCS})
-target_link_libraries(testInputEvents Qt5::Test Qt5::DBus Qt5::Gui Qt5::Widgets KF5::ConfigCore)
+add_executable(testInputEvents input_event_test.cpp ../../input_event.cpp)
+target_link_libraries(testInputEvents Qt5::Test Qt5::DBus Qt5::Gui Qt5::Widgets KF5::ConfigCore LibInputTestObjects)
 add_test(NAME kwin-testInputEvents COMMAND testInputEvents)
 ecm_mark_as_test(testInputEvents)
diff --git a/kcmkwin/kwinoptions/main.cpp b/kcmkwin/kwinoptions/main.cpp
--- a/kcmkwin/kwinoptions/main.cpp
+++ b/kcmkwin/kwinoptions/main.cpp
@@ -235,4 +235,3 @@
                            )
 
 #include "main.moc"
-#include "moc_main.cpp"
diff --git a/kcmkwin/kwinrules/CMakeLists.txt b/kcmkwin/kwinrules/CMakeLists.txt
--- a/kcmkwin/kwinrules/CMakeLists.txt
+++ b/kcmkwin/kwinrules/CMakeLists.txt
@@ -1,19 +1,27 @@
 # KI18N Translation Domain for this library
 add_definitions(-DTRANSLATION_DOMAIN=\"kcmkwinrules\")
 add_definitions(-DKCMRULES)
-########### next target ###############
 
 include_directories(../../)
-set(kwinrules_MOC_HDRS yesnobox.h ../../cursor.h ../../plugins/platforms/x11/standalone/x11cursor.h)
-qt5_wrap_cpp(kwinrules_MOC_SRCS ${kwinrules_MOC_HDRS})
-set(kwinrules_SRCS ../../rulebooksettings.cpp ruleswidget.cpp ruleslist.cpp kwinsrc.cpp detectwidget.cpp main.cpp ${kwinrules_MOC_SRCS})
+set(kwinrules_SRCS  ../../rulebooksettings.cpp
+                    ../../cursor.cpp
+                    ../../plugins/platforms/x11/standalone/x11cursor.cpp
+                    ../../rules.cpp
+                    ../../placement.cpp
+                    ../../utils.cpp
+                    yesnobox.cpp
+                    ruleswidget.cpp
+                    ruleslist.cpp
+                    kwinsrc.cpp
+                    detectwidget.cpp
+                    )
 
 ki18n_wrap_ui(kwinrules_SRCS ruleslist.ui detectwidget.ui editshortcut.ui ruleswidgetbase.ui)
 
 kconfig_add_kcfg_files(kwinrules_SRCS ../../rulesettings.kcfgc)
 kconfig_add_kcfg_files(kwinrules_SRCS ../../rulebooksettingsbase.kcfgc)
 
-add_executable(kwin_rules_dialog ${kwinrules_SRCS})
+add_library(KWinRulesObjects OBJECT ${kwinrules_SRCS})
 
 set(kwin_kcm_rules_XCB_LIBS
     XCB::CURSOR
@@ -36,19 +44,14 @@
 if (KWIN_BUILD_ACTIVITIES)
     set(kcm_libs ${kcm_libs} KF5::Activities)
 endif()
+target_link_libraries(KWinRulesObjects ${kcm_libs} ${kwin_kcm_rules_XCB_LIBS})
 
-target_link_libraries(kwin_rules_dialog ${kcm_libs} ${kwin_kcm_rules_XCB_LIBS})
-
+add_executable(kwin_rules_dialog main.cpp)
+target_link_libraries(kwin_rules_dialog KWinRulesObjects)
 install(TARGETS kwin_rules_dialog DESTINATION ${LIBEXEC_INSTALL_DIR})
 
-########### next target ###############
-
-set(kcm_kwinrules_PART_SRCS kcm.cpp ${kwinrules_SRCS})
-
-add_library(kcm_kwinrules MODULE ${kcm_kwinrules_PART_SRCS})
-
-target_link_libraries(kcm_kwinrules ${kcm_libs} ${kwin_kcm_rules_XCB_LIBS})
-
+add_library(kcm_kwinrules MODULE kcm.cpp)
+target_link_libraries(kcm_kwinrules KWinRulesObjects)
 install(TARGETS kcm_kwinrules DESTINATION ${PLUGIN_INSTALL_DIR})
 
 ########### install files ###############
diff --git a/kcmkwin/kwinrules/kwinsrc.cpp b/kcmkwin/kwinrules/kwinsrc.cpp
--- a/kcmkwin/kwinrules/kwinsrc.cpp
+++ b/kcmkwin/kwinrules/kwinsrc.cpp
@@ -16,15 +16,7 @@
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
-// Include some code from kwin core in order to avoid
-// double implementation.
-
-#include "../../cursor.cpp"
-#include "../../plugins/platforms/x11/standalone/x11cursor.cpp"
-#include "../../rules.cpp"
-#include "../../placement.cpp"
-#include "../../options.cpp"
-#include "../../utils.cpp"
+#include <input.h>
 
 KWin::InputRedirection *KWin::InputRedirection::s_self = nullptr;
 
diff --git a/kcmkwin/kwinrules/yesnobox.h b/kcmkwin/kwinrules/yesnobox.h
--- a/kcmkwin/kwinrules/yesnobox.h
+++ b/kcmkwin/kwinrules/yesnobox.h
@@ -28,18 +28,7 @@
 class YesNoBox : public QWidget {
     Q_OBJECT
 public:
-    explicit YesNoBox( QWidget *parent ) : QWidget(parent)
-    {
-        QHBoxLayout *l = new QHBoxLayout(this);
-        l->setContentsMargins(0, 0, 0, 0);
-        l->addWidget(yes = new QRadioButton(i18n("Yes"), this));
-        l->addWidget(no = new QRadioButton(i18n("No"), this));
-        l->addStretch(100);
-        no->setChecked(true);
-        connect(yes, SIGNAL(clicked(bool)), this, SIGNAL(clicked(bool)));
-        connect(yes, SIGNAL(toggled(bool)), this, SIGNAL(toggled(bool)));
-        connect(no, SIGNAL(clicked(bool)), this, SLOT(noClicked(bool)));
-    }
+    explicit YesNoBox( QWidget *parent );
     bool isChecked() { return yes->isChecked(); }
 public Q_SLOTS:
     void setChecked(bool b) { yes->setChecked(b); }
diff --git a/plugins/kdecorations/aurorae/themes/plastik/code/plastikplugin.cpp b/plugins/kdecorations/aurorae/themes/plastik/code/plastikplugin.cpp
--- a/plugins/kdecorations/aurorae/themes/plastik/code/plastikplugin.cpp
+++ b/plugins/kdecorations/aurorae/themes/plastik/code/plastikplugin.cpp
@@ -29,5 +29,3 @@
     engine->addImageProvider(QLatin1String("plastik"), new KWin::PlastikButtonProvider());
     QQmlExtensionPlugin::initializeEngine(engine, uri);
 }
-
-#include "moc_plastikplugin.cpp"
diff --git a/utils.h b/utils.h
--- a/utils.h
+++ b/utils.h
@@ -194,8 +194,10 @@
     explicit Process(QObject *parent = nullptr);
     ~Process() override;
 
+#ifndef KCMRULES
 protected:
     void setupChildProcess() override;
+#endif
 };
 
 } // namespace
diff --git a/utils.cpp b/utils.cpp
--- a/utils.cpp
+++ b/utils.cpp
@@ -77,6 +77,13 @@
 
 #endif
 
+Process::Process(QObject *parent)
+    : QProcess(parent)
+{
+}
+
+Process::~Process() = default;
+
 #ifndef KCMRULES
 void updateXTime()
 {
@@ -135,13 +142,6 @@
     xcb_ungrab_keyboard(connection(), XCB_TIME_CURRENT_TIME);
 }
 
-Process::Process(QObject *parent)
-    : QProcess(parent)
-{
-}
-
-Process::~Process() = default;
-
 void Process::setupChildProcess()
 {
     sigset_t userSiganls;