New in version 3.1.
Mark a target as a Windows Runtime component for the Visual Studio generator. Compile the target with C++/CX language extensions for Windows Runtime. For SHARED and MODULE libraries, this also defines the _WINRT_DLL preprocessor macro.
Note
Currently this is implemented only by Visual Studio generators. Support may be added to other generators in the future.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/prop_tgt/VS_WINRT_COMPONENT.html