[clangd-dev] Clangd CUDA support

Ilya Biryukov via clangd-dev clangd-dev at lists.llvm.org
Mon Mar 25 04:03:20 PDT 2019

Ah, we don't have clangd enabled for .cu files,
https://reviews.llvm.org/D59759 would should do the trick clangd.
However, I'm not 100% certain it's a good idea since compilation db seems
to be broken for CUDA files by default. OTOH, clangd is already enabled on
CUDA headers, so it's not like we were handling this use-case properly

On Sat, Mar 23, 2019 at 8:29 PM Jacek Ciesielski <trupwszafie at o2.pl> wrote:

> Hi Ilya,
> Thank you for replying!
> Today, I did some more extensive testing. I've managed to run YCM with
> clangd support successfully. I still fail with libclang. I guess that's a
> whole different story.
> It turns out, I've been using compile_commands.json generated by cmake,
> which doesn't support clang as cuda compiler. After correcting the flags
> manually, I was able to get completion for a .cu file. Like you said, it
> doesn't recognize cuda specific code, e.g. __syncthreads(); but I reckon
> those are fixable by some quick macros and include hacks.
> However, my setup of VSCode fails completely when it comes to .cu files. I
> am attaching screen showing a simple cpp-only completion test. I expected
> it would know a list of vector's method.
> Setup:
> Arch linux 5.0.3
> VSCode 1.32.3, vscode-clangd 0.0.11
> clangd 7.0.1
> My project is closed source. I need some CUDA 9 and 10 features so I am
> kinda forced to use nvcc.
> I suppose the next position on my wish list is generating commands for
> clang by cmake or accepting nvcc flags by clang. Even with script replacing
> flags, needing to run it each time I regenerate flags is dull.
> Best regards,
> Jacek
> On 3/22/19 3:36 PM, Ilya Biryukov wrote:
> Hi Jacek,
> We haven't put any effort into supporting CUDA so far.
> However, clang supports CUDA, so basic features should work on CUDA code,
> e.g. non-CUDA-specific completions, resolve, etc.
> The difficulty is obtaining a compilation database that specifies proper
> CUDA-specific flags.
> Could you describe the setup with YCM or VSCode that you tried and that
> didn't work for you? What's the project (if it's open-source) you tried
> running on? What's your OS and what kind of toolchain do you use for the
> build (nvcc, clang)?
> On Fri, Mar 22, 2019 at 2:26 PM Jacek Ciesielski via clangd-dev <
> clangd-dev at lists.llvm.org> wrote:
>> Hi guys,
>> I couldn't find any reliable info whether clangd supports CUDA completion.
>> Docs mention only C++. Yet, I tried using it with some CUDA code. I
>> didn't succeed trying with YCM nor VS Code. Is it possible at all? How
>> much effort would that possibly take to develop support for CUDA?
>> Best regards,
>> Jacek
>> _______________________________________________
>> clangd-dev mailing list
>> clangd-dev at lists.llvm.org
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> --
> Regards,
> Ilya Biryukov

Ilya Biryukov
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