AutoGen source group
--------------------

* Global properties :prop_gbl:`AUTOGEN_SOURCE_GROUP`,
  :prop_gbl:`AUTOMOC_SOURCE_GROUP` and
  :prop_gbl:`AUTORCC_SOURCE_GROUP` were
  introduced to allow files generated by :prop_tgt:`AUTOMOC` or
  :prop_tgt:`AUTORCC` to be placed in a :command:`source_group`.
