[CMake] Detect Clang as the CUDA compiler

[Robert Maynard]

Hi Andrew,

I am not aware of anybody working on adding clang as a CUDA compiler.
After a quick glance at the clang compiler flags it seems that very
few / if any of the current NVCC logic could be reused for the clang
compiler ( outside of toolkit location).

On Wed, Sep 28, 2016 at 6:02 PM, Andrew Corrigan
<andrew.corrigan at nrl.navy.mil> wrote:
> Are there plans for having CMake detect Clang as a CUDA compiler, as opposed to NVCC?  I saw this message on the developers mailing list, but with no response [1].   Support for this would be very useful.
>
> [1] https://cmake.org/pipermail/cmake-developers/2016-March/028034.html
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