get_source_file_property(<variable> <file> [DIRECTORY <dir> | TARGET_DIRECTORY <target>] <property>)
get_source_file_property(<variable> <file> [DIRECTORY <dir> | TARGET_DIRECTORY <target>] <property>)
get_source_file_property(generated ${source} TARGET_DIRECTORY ${target} GENERATED)
get_source_file_property(
IS_HEADER_ONLY ${_bf_src}
TARGET_DIRECTORY bpfilter
HEADER_FILE_ONLY
)