Handle CMake policy 0071 correctly

CMakeLists.txt

@@ -14,6 +14,14 @@ if(COMMAND cmake_policy)
    if(POLICY CMP0042)
        cmake_policy(SET CMP0042 NEW)
    endif()
+
+    # AUTOMOC/AUTOUIC on generated files policy. Since we only
+    # generate resource files with fgrcc which don't use Qt,
+    # we set those files source property. See the help for this
+    # policy for more info
+    if(POLICY CMP0071)
+        cmake_policy(SET CMP0071 NEW)
+    endif()
 endif()
 
 message("CMAKE Build type: ${CMAKE_BUILD_TYPE}")

CMakeModules/SetupFGFSEmbeddedResources.cmake

@@ -9,6 +9,13 @@ function(setup_fgfs_embedded_resources)
     set_property(GLOBAL APPEND PROPERTY EMBEDDED_RESOURCE_SOURCES ${SOURCES})
     set_property(GLOBAL APPEND PROPERTY EMBEDDED_RESOURCE_HEADERS ${HEADERS})
 
+    # set the flag for CMake polocy 00071, ensure Qt AUTOfoo don't process
+    # generated files
+    foreach(sourcefile IN LISTS ${SOURCES} ${HEADERS})
+      set_property(SOURCE ${sourcefile} PROPERTY SKIP_AUTOMOC ON)
+      set_property(SOURCE ${sourcefile} PROPERTY SKIP_AUTOUIC ON)
+    endforeach()
+
     # On Windows, make sure fgrcc can be run (it needs third-party libraries)
     if(MSVC)
       if(MSVC_3RDPARTY_ROOT AND MSVC_3RDPARTY_DIR)

utils/fgqcanvas/CMakeLists.txt

@@ -2,6 +2,11 @@ cmake_minimum_required(VERSION 3.0)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED YES)
 
+  # AUTOMOC/AUTOUIC on generated files policy.
+  if(POLICY CMP0071)
+      cmake_policy(SET CMP0071 NEW)
+  endif()
+
 include(GNUInstallDirs)
 
 project(FGQCanvas)