OBJECT_OUTPUTS

From Get docs
Cmake/docs/3.21/prop sf/object outputs


OBJECT_OUTPUTS

Additional outputs for a Ninja or Makefile Generators rule.

Additional outputs created by compilation of this source file. If any of these outputs is missing the object will be recompiled. This is supported only on the Ninja and Makefile Generators and will be ignored on other generators.

This property supports generator expressions.

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https://cmake.org/cmake/help/v3.21/prop_sf/OBJECT_OUTPUTS.html