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CMake 3.18 added the first support for any compiler for 17 and 20,
but those were recognized as valid values in earlier CMake versions
even though there was no compiler that supported them. Make this
distinction clear to avoid creating the impression that these standards
could be usefully used before CMake 3.18.
While 98 is recognized as a valid value, it also just gets treated as 03
internally. Document this behavior as well.
Fixes: #22711
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Note that some CUDA C++ language standard levels were added before any
compilers actually supported them. In such cases, the value of
`CUDA_STANDARD` gracefully degrades to the highest supported by the
compiler (unless `CUDA_STANDARD_REQUIRED` is enabled). Therefore we can
document support for each value based on when CMake learned of it.
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Clang 12 landed initial support for C++23 language mode flag -std={c|gnu}++2b
in commit 6627a3c2873fdf7ccba1a1573371079be48b36e8.
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Run the `Utilities/Sphinx/update_versions.py` script to add initial
markup to every top-level document and find module.
Issue: #19715
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When crosscompiling we pass the sysroot.
We need to try various architecture flags. Clang doesn't automatically
select one that works. First try the ones that are more likely to work
for modern installations:
* <=sm_50 is deprecated since CUDA 10.2, try sm_52 first for
future compatibility.
* <=sm_20 is removed since CUDA 9.0, try sm_30.
Otherwise fallback to Clang's current default. Currently that's `sm_20`,
the lowest it supports.
Separable compilation isn't supported yet.
Fixes: #16586
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Starting in CUDA 9 the default compilation mode is C++14, and you need
to explicitly enable C++98/03 mode.
While at it, document `14` among the values for `CUDA_STANDARD`. This
was accidentally left out of commit v3.9.0-rc1~118^2 (CUDA: Add support
for the C++14 standard flag, 2017-05-11).
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