XCODE_EXPLICIT_FILE_TYPE
Set the Xcode explicitFileType attribute on its reference to a source file. CMake computes a default based on file extension but can be told explicitly with this property.
See also XCODE_LAST_KNOWN_FILE_TYPE.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/prop_sf/XCODE_EXPLICIT_FILE_TYPE.html