New in version 3.9.
Name of the source_group() for AUTOMOC and AUTORCC generated files.
Files generated by AUTOMOC and AUTORCC are not always known at configure time and therefore can’t be passed to source_group(). AUTOGEN_SOURCE_GROUP an be used instead to generate or select a source group for AUTOMOC and AUTORCC generated files.
For AUTOMOC and AUTORCC specific overrides see AUTOMOC_SOURCE_GROUP and AUTORCC_SOURCE_GROUP respectively.
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https://cmake.org/cmake/help/v3.19/prop_gbl/AUTOGEN_SOURCE_GROUP.html