IMPORTED_OBJECTS
;-list of absolute paths to the object files on disk for an imported object library.
Ignored for non-imported targets.
Projects may skip IMPORTED_OBJECTS if the configuration-specific property IMPORTED_OBJECTS_<CONFIG> is set instead.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.9/prop_tgt/IMPORTED_OBJECTS.html