New in version 3.9.
Directory where AUTOMOC, AUTOUIC and AUTORCC generate files for the target.
The directory is created on demand and automatically added to the ADDITIONAL_CLEAN_FILES target property.
When unset or empty the directory <dir>/<target-name>_autogen is used where <dir> is CMAKE_CURRENT_BINARY_DIR and <target-name> is NAME.
By default AUTOGEN_BUILD_DIR is unset.
See the cmake-qt(7) manual for more information on using CMake with Qt.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/prop_tgt/AUTOGEN_BUILD_DIR.html