Bundle QPA plugin directly

On wayland, we know we're always going to load our internal QPA. Instead
of shipping a plugin and loading it dynamically we can use Qt static
plugins.

This should result in slightly faster load times, but also reduce the
number of moving pieces for kwin.

This also prevents anyone outside kwin loading our QPA which wouldn't
have made any sense and just crashed.

CMakeLists.txt

@@ -826,6 +826,7 @@ endif()
 
 add_subdirectory(platformsupport)
 add_subdirectory(plugins)
+target_link_libraries(kwin_wayland KWinQpaPlugin)
 
 ########### install files ###############
 

autotests/integration/CMakeLists.txt

@@ -26,7 +26,7 @@ ecm_add_qtwayland_client_protocol(KWinIntegrationTestFramework_SOURCES
     BASENAME xdg-shell
 )
 add_library(KWinIntegrationTestFramework STATIC ${KWinIntegrationTestFramework_SOURCES})
-target_link_libraries(KWinIntegrationTestFramework kwin Qt5::Test Wayland::Client)
+target_link_libraries(KWinIntegrationTestFramework kwin Qt5::Test Wayland::Client KWinQpaPlugin)
 
 function(integrationTest)
     set(optionArgs WAYLAND_ONLY)

autotests/integration/kwin_wayland_test.cpp

@@ -30,6 +30,8 @@
 #include <sys/socket.h>
 #include <iostream>
 
+Q_IMPORT_PLUGIN(KWinIntegrationPlugin)
+
 namespace KWin
 {
 

main_wayland.cpp

@@ -60,6 +60,8 @@
 #include <iostream>
 #include <iomanip>
 
+Q_IMPORT_PLUGIN(KWinIntegrationPlugin)
+
 namespace KWin
 {
 

plugins/qpa/CMakeLists.txt

@@ -16,8 +16,8 @@ set(QPA_SOURCES
 include(ECMQtDeclareLoggingCategory)
 ecm_qt_declare_logging_category(QPA_SOURCES HEADER logging.h IDENTIFIER KWIN_QPA CATEGORY_NAME kwin_qpa_plugin DEFAULT_SEVERITY Critical)
 
-add_library(KWinQpaPlugin MODULE ${QPA_SOURCES})
-set_target_properties(KWinQpaPlugin PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin/platforms/")
+add_library(KWinQpaPlugin OBJECT ${QPA_SOURCES})
+target_compile_definitions(KWinQpaPlugin PRIVATE QT_STATICPLUGIN)
 
 set(QT5PLATFORMSUPPORT_LIBS
     Qt5::FontDatabaseSupportPrivate
@@ -31,10 +31,3 @@ target_link_libraries(KWinQpaPlugin
     Fontconfig::Fontconfig
     kwin
 )
-
-install(
-    TARGETS
-        KWinQpaPlugin
-    DESTINATION
-        ${PLUGIN_INSTALL_DIR}/platforms/
-)