Homebrew: emcc can't find wasm-ld

[DragonOsman]

Just now I tried to run em++ after setting EMCC_WASM_BACKEND and EMCC_DEBUG variables to 1 and I got this error:

shared:ERROR: WASM_BACKEND selected but could not find lld (wasm-ld): C:/Users/Osman/emsdk/clang/e1.38.20_64bit\wasm-ld.exe

I'd ran these commands before that:

emsdk install latest --vs2017 --build=Release
emsdk activate latest --vs2017 --build=Release
emsdk_env

I'd really like some help here. Thanks in advance.

[Fraer]

Have same issue on mac os, just made brew install emscripten and each time i run emcc i have the message:

shared:ERROR: emcc: WASM_BACKEND selected but could not find lld (wasm-ld): /usr/bin/wasm-ld

is it possible to install emscripten with all stuff needed for wasm ?

[kripken]

@Fraer it's possible the brew setup only supports fastcomp for now. We should file a bug for that - if you can please do so and link to it here. (I don't have a MacOS machine so I can't provide any info they might ask me if I file a bug there.)

Separately from brew, the wasm backend should work in the official emsdk builds, see https://v8.dev/blog/emscripten-llvm-wasm#testing

[sbc100]

Seems like this is an issue with the homebrew package. Is this the right tracker for such bugs? Does anyone know who owns that package?

[kripken]

I noticed this Homebrew discussion topic on this: https://discourse.brew.sh/t/switch-emscripten-to-llvm/5595

[sbc100]

I'm tempted to close this since we can fix this in the emscripten project. Only the homebrew maintainer can fix this IIUC.

[kripken]

I did some investigating here:

• The main brew repo discourages people from filing issues for things that aren't clearly bugs with STRs, so I didn't file an issue there.
• I went through commits trying to find who maintains the emscripten release, but it was hard to tell - there are commits to update to new builds, but they are by people that do a lot of other stuff. I'm not sure if those are just automatic or semi-automatic updates, or actual devs that are familiar with it.
• I pinged the forum post about this that I linked earlier. No response yet.

This is unfortunate since sometimes people use brew and run into issues, like here. In parallel to trying to contact the proper brew people, maybe we should update our docs on the install page to say that only the emsdk is supported officially?

[sbc100]

I agree with updating the docs, at least so say that the brew package only supports fastcomp .

[kripken]

Docs have been updated. I think we can remove this from the blocker list given that, as suggested by @sbc100

I'll still try to contact the proper brew people. A week passed since that form post, I'll try filing an issue.

[kripken]

I posted a comment on the latest brew PR that updates emscripten.