Enables tracing output for target properties.
This variable can be populated with a list of properties to generate debug output for when evaluating target properties. Currently it can only be used when evaluating the :prop_tgt:INCLUDE_DIRECTORIES, :prop_tgt:COMPILE_DEFINITIONS, :prop_tgt:COMPILE_OPTIONS, :prop_tgt:AUTOUIC_OPTIONS, :prop_tgt:SOURCES, :prop_tgt:COMPILE_FEATURES, :prop_tgt:POSITION_INDEPENDENT_CODE target properties and any other property listed in :prop_tgt:COMPATIBLE_INTERFACE_STRING and other
COMPATIBLE_INTERFACE_ properties. It outputs an origin for each entry in the target property. Default is unset.