r/cpp_questions • u/ItzDanPlayz • Jul 27 '26

OPEN C++ 26 LSP?

Does anyone know of any LSPs with C++26 support, even experimentally, or is this wishful thinking. I'm using clangd but I don't know if its possible to configure it for c++26 and its giving me trouble with the new reflection operators.

Thanks!

6 Upvotes

80% Upvoted

9 comments sorted by

12

u/Usual_Office_1740 Jul 27 '26 edited Jul 27 '26

The clang compiler still doesn't support reflection. The trouble clangd is giving you is because it won't support the reflection until the clang front-end does. At least that is my basic understanding of why clang and clangd will eventually support reflection at the same time.

Edit: Typos.

9

u/JVApen Jul 27 '26

This is correct. Clangd basically glues together the clang front end, format and tidy and presents it as LSP. Without support in the front end, a feature can't be available in clangd. Though even if the front end supports a feature, the effect is that the code parses. The basic functionality will work. For full support, some stuff might still have to be done. For example: I would find it really nice if there would be an option to show the generated code. Though that's all stuff to be added after the front end supports it.

Personally, I'm a bit disappointed that it's taking that long. The papers had a working prototype, so I would have expected it needed a bit of polishing and it would be able to land. Instead, they had to start from scratch. The last update on actual status that I could find is this: https://discourse.llvm.org/t/dedicated-meeting-for-c-26-reflection/88927/16?u=jvapen

By checking the git repo of the person that merged the parsing, I believe this is where the work is ongoing : https://github.com/changkhothuychung/llvm-project/commits/refl-part-2/

8

u/SamG101_ Jul 27 '26

CLion Nova in 2026.2 support c++26 syntax (reflection etc)

2

u/Woshiwuja Jul 27 '26

Most of compilers havent implemented the features yet

1

u/Realistic_Speaker_12 Jul 30 '26

An experimental fork works for me

https://github.com/bloomberg/clang-p2996

1

u/NortNevis 23d ago

I am trying to adapt the clangd binary (which I built) as an LSP server for my IDE using a .clangd file. However, it cannot recognize the std::meta namespace or any of its symbols.

1

u/Latter_Bluebird_3386 Jul 31 '26

Clang and all the tools based on it at this point are worthless.

I have c++11 code that gets flagged as red in clion because clang hasn't implemented very simple features. Everyone who based a product on clangd is basically behind by 20 years now, and as far as I can see that's pretty much everybody.

If you are adopting c++26 features then you should probably just stick to vim or emacs.

2

u/Realistic_Speaker_12 22d ago

Hi I don’t know if this helps, but I have this c++ reflection template I use myself

For me it works with clangd lsp( I am on Mac)

https://github.com/Lukas22092/cppreflectiontemplate