CMake/Tests/Cuda/MixedStandardLevels
Robert Maynard 4b7618d170 CUDA: Fix CUDA_STANDARD selection via cxx_std_11 with CXX_STANDARD
When C++ features require a certain C++/CUDA level, verify or update the
standard level target property for each language independently.

While at it, add missing rejection of invalid `CUDA_STANDARD` property
values.

Co-Author: Brad King <brad.king@kitware.com>
Fixes: #17519
2017-12-15 10:29:20 -05:00
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