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Created by Mario Emmenlauer@emmenlau🌞Contributor

CUDA: I enabled c++20 in my project, now the configuration fails with `Target "XXX" requires the language dialect "CUDA20"` on MSVC

I have a project that used to build with C++17 without issues. It uses Cuda. I configure this with

    set_target_properties(XXX PROPERTIES
        CXX_STANDARD 20
        CXX_STANDARD_REQUIRED ON
        CXX_EXTENSIONS NO
        CUDA_STANDARD 20
        CUDA_ARCHITECTURES 50)

This used to work well when I used "17" instead of "20". Now with version "20" I get build errors on MSVC with the ClangCl compiler frontend:

-- Configuring done
CMake Error in CMakeLists.txt:
  Target "XXX" requires the language dialect "CUDA20" , but CMake does
  not know the compile flags to use to enable it.
-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.

I'm not really sure what that means?

If cmake does not (yet) support CUDA_STANDARD=20 with MSVC or ClangCl, it would be great if the error message could be more helpful. I've googled for a while for the current error message and could not find anything remotely useful for CUDA. If this really is the problem, something like this would be better:

  Target "XXX" wants to set the language dialect "CUDA_STANDARD" to "20".
  But the current compiler "xxx" does not support this, or cmake does not
  know the flags to enable it.
Edited by Brad King
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