Qt6: Support Qt6

Author: QxQ

CMakeLists.txt

@@ -11,7 +11,14 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTORCC ON)
 
-find_package(Qt5 COMPONENTS Core Widgets Network Gui REQUIRED)
+option(QVPLUGIN_USE_QT6 "Use Qt6")
+if(QVPLUGIN_USE_QT6)
+    set(QV_QT_LIBNAME Qt6)
+else()
+    set(QV_QT_LIBNAME Qt5)
+endif()
+find_package(${QV_QT_LIBNAME} COMPONENTS Core Widgets Gui Network REQUIRED)
+
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
 set(QVPLUGIN_INTERFACE_INCLUDE_DIR "interface/")
@@ -47,9 +54,9 @@ if(APPLE)
 endif()
 
 target_link_libraries(${PROJECT_NAME}
-    Qt5::Core
-    Qt5::Gui
-    Qt5::Network
-    Qt5::Widgets)
+    ${QV_QT_LIBNAME}::Core
+    ${QV_QT_LIBNAME}::Gui
+    ${QV_QT_LIBNAME}::Network
+    ${QV_QT_LIBNAME}::Widgets)
 
 install(TARGETS ${PROJECT_NAME} DESTINATION share/qv2ray/plugins)