Could you please provide guides for building `clang` to wasm?

[guyutongxue]

Hello! I'm interested in your project (for detailed guide of building LLVM on WASM). I noticed that the GitHub Page is using clang-wasm branch which includes a clang.wasm, but the README only shows how to build llc / lld.

In detail, I'm trying to build clangd language server and face some issues on finding Standard C/C++ library headers in Emscripten FS. Could you tell me how to embed (and how to find) those C/C++ headers to WASM? Seems that the original README just embedding lib folder is not a correct approach for clang.

Thank you!

[soedirgo]

Hi! Yes, the README needs some updating - it was initially only for llc & lld, but the demo page uses clang instead of llc. IIRC clang was compiled as part of building llc & lld so I only had to export clang.* - will check again.

I haven't compiled clangd though, that'd be interesting to try!

[Mykhailo418]

@soedirgo Hello, thanks for your repo, it is very helpful. Could you, please, provide some details on how to compile clang?
According to your Readme, I only added clang in enable projects like this -DLLVM_ENABLE_PROJECTS="clang;lld", but in a browser, I got such an issue: fatal error: 'stdio.h' file not found. However, in your demo, everything works fine. I think I definitely missed something.
Thanks

[soedirgo]

@Mykhailo418 do you have a repo I can check out? The stdlib should be included through one of these flags