[CMake] CUDA Support

[Dustyn Blasig]

"we should not try to combine enable_language(CUDA) with
find_package(CUDA). They do not work together, either use one or another."

Absolutely, my goal is to move to the new built-in language support. I'm
having trouble doing that because I can't find any documentation on it. For
instance, what is the new equivalent CUDA_TOOLKIT_ROOT_DIR? Without
find_package(CUDA), I don't see anything set that have the equivalent.
Also, in some cases the CUDA include directory is added to targets, and in
other cases it isn't, even if the target depends on source with .cu. What
is the documented behavior for this?

I'm sure there has to be a page somewhere on this, but going to page 4 on
Google search didn't uncover anything, and the first 2 pages all point to
various versions of FindCUDA : )

On Fri, Mar 29, 2019 at 11:28 AM Dmitry Mikushin <
dmitry at parallel-computing.pro> wrote:

> Hi,
>
> That was my confusion as well: to my understanding, we should not try to
> combine enable_language(CUDA) with find_package(CUDA). They do not work
> together, either use one or another.
>
> Kind regards,
> - Dmitry.
>
> пт, 29 мар. 2019 г. в 19:58, Dustyn Blasig <dustyn at blasig.us>:
>
>> Hi All,
>>
>> I can't find any documentation on the new-ish "native" CUDA support. I
>> need to know all the variables that we can use, and (for instance) whether
>> checking the CUDA version is now supported. When searching online, I'm
>> always directed to the old FindCUDA pages which don't seem to match what is
>> available with the native language support.
>>
>> Currently, I'm "hacking" my way through things by using both flows. I add
>> CUDA as a language, use the found CUDA compiler to construct a
>> CUDA_TOOLKIT_ROOT_DIR and then call find_package(CUDA) to get the old
>> environment variables set up.
>>
>> Cheers!
>> --
>>
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