WRAP_EXCLUDE
Exclude this source file from any code wrapping techniques.
Some packages can wrap source files into alternate languages to provide additional functionality. For example, C++ code can be wrapped into Java or Python etc using SWIG etc. If WRAP_EXCLUDE is set to true (1 etc) that indicates that this source file should not be wrapped.
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https://cmake.org/cmake/help/v3.8/prop_sf/WRAP_EXCLUDE.html