BUILDSYSTEM_TARGETS

This read-only directory property contains a ;-list of buildsystem targets added in the directory by calls to the add_library(), add_executable(), and add_custom_target() commands. The list does not include any Imported Targets or Alias Targets, but does include Interface Libraries. Each entry in the list is the logical name of a target, suitable to pass to the get_property() command TARGET option.

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https://cmake.org/cmake/help/v3.9/prop_dir/BUILDSYSTEM_TARGETS.html