Fix cmake build issues (#5670)

* Fix cmake build issues
* Temporary force linking of external object

ApplicationCode/Application/RiaApplication.cpp

@@ -1709,6 +1709,12 @@ bool RiaApplication::generateCode( const QString& fileName, QString* errMsg )
 
     std::string fileExt = QFileInfo( fileName ).suffix().toStdString();
 
+    {
+        // TODO: Manually instantiate the markdown generator until cmake issues are fixed
+        // This will make sure the markdown generator is registered in the factory in the cafPdmScripting library
+        caf::PdmMarkdownGenerator testObj;
+    }
+
     std::unique_ptr<caf::PdmCodeGenerator> generator( caf::PdmCodeGeneratorFactory::instance()->create( fileExt ) );
     if ( !generator )
     {

Fwk/AppFwk/cafPdmScripting/CMakeLists.txt

@@ -27,12 +27,7 @@ set( PROJECT_FILES
 )
 
 
-# NOTE! Adding the library as a cmake "OBJECT" library
+add_library( ${PROJECT_NAME}
-# to make sure the linker is not pruning the seemingly unused features, 
-# and to make sure that the static initialization based registration of the features into the factory is done properly
-# see https://gitlab.kitware.com/cmake/community/wikis/doc/tutorials/Object-Library
-# and https://cmake.org/cmake/help/v3.15/command/add_library.html?highlight=add_library#object-libraries
-add_library( ${PROJECT_NAME} OBJECT
  	${PROJECT_FILES}
 )
 
@@ -47,18 +42,6 @@ target_link_libraries ( ${PROJECT_NAME}
     LibCore
 )
 
-#  Before cmake 3.12 OBJECT libraries could not use the target_link_libraries command, 
-#  So we need to set the POSITION_INDEPENDENT_CODE option  manually
-
-set_property(TARGET ${PROJECT_NAME} PROPERTY POSITION_INDEPENDENT_CODE ON)
-
-# Not to be used until we can use cmake 3.12 or above 
-#target_link_libraries ( ${PROJECT_NAME}
-#    cafCommand
-#	cafUserInterface
-#        ${QT_LIBRARIES}
-#)
-
 
 source_group("" FILES ${PROJECT_FILES})