[CMake] import objects to CMake

[hex]

hello community,

Following an example on the usage of IMPORTED_OBJECTS from the book 
"Professional CMake"

I receive the following error:

/Error evaluating generator expression://
//
//    $<TARGET_SOURCES://myObjLib>//
//
//  Expression did not evaluate to a known generator expression/


I wonder if there is a mistake in the code snippet? I was able to make 
it work using TARGET_OBJECTS instead of TARGET_SOURCES (CMake 3.15).

this is the original CMakeLists.txt:

add_library(myObjLib OBJECT IMPORTED)
set_target_properties(myObjLib PROPERTIES
    IMPORTED_OBJECTS /some/path/obj1.obj
                     /some/path/obj2.obj
)

add_executable(myExe $<TARGET_SOURCES:myObjLib>)


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