REPORT_UNDEFINED_PROPERTIES

From Get docs
Cmake/docs/3.21/prop gbl/report undefined properties


REPORT_UNDEFINED_PROPERTIES

If set, report any undefined properties to this file.

If this property is set to a filename then when CMake runs it will report any properties or variables that were accessed but not defined into the filename specified in this property.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/prop_gbl/REPORT_UNDEFINED_PROPERTIES.html