Current docker image doesn't support llvm upstream

[Fraer]

If env var EMCC_WASM_BACKEND=1

When calling any of emconfigure or emcc, etcc ...

emcc: WASM_BACKEND selected but could not find lld (wasm-ld): /emsdk_portable/llvm/clang/bin/wasm-ld

[trzecieu]

Hi @Fraer current docker images base on fastcomp backend (instead of llvm upstream)
I'm putting some work to either support both of switch to upstream. It's related to: emscripten-core/emsdk#188
I'm keeping this issue open and will close once LLVM backend is added.

Thank you for reporting!

[sbc100]

So is this an issue with the docker image? Can you re-title it accordingly please?

[kripken]

@trzecieu it looks like you added upstream backend support, so we can close this? Thanks!

Btw, are there docs for how to use the upstream backend there?

[trzecieu]

Hi @kripken, upstream backend isn't added yet, I was fighting with recovering fastcomp llvm.

[kripken]

I see, thanks @trzecieu

[trzecieu]

Fixed now:

trzeci/emscripten-upstream

➜ docker run --rm -it trzeci/emscripten-upstream:latest clang --version
clang version 10.0.0 (/b/s/w/ir/cache/git/chromium.googlesource.com-external-github.com-llvm-llvm--project 4e71702cd4ab2c77aaa753770e99526085e5e6eb)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /emsdk_portable/upstream/bin

And how it looked like:
trzeci/emscripten

clang version 6.0.1 (https://github.com/emscripten-core/emscripten-fastcomp-clang 98df4be387dde3e3918fa5bbb5fc43e1a0e1daac) (https://github.com/emscripten-core/emscripten-fastcomp 1b4148f39a69c7fc62edadd85e4122b68694dfb7) (emscripten 1.38.31 : 1.38.31)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /emsdk_portable/clang/tag-e1.38.43/build_tag-e1.38.43_64/bin

This is a first implementation, which is not size optimized yet and it's 100MB larger than fastcomp version of the same image. Nonetheless, it should be fully functional now!

Cheers,

[kripken]

Great news, thanks @trzecieu !

[forderud]

Thank's a lot @trzecieu. I'll be looking forward to testing the new "upstream" container.

One small comment: Would it be possible for you to add some documentation to https://hub.docker.com/r/trzeci/emscripten-upstream/ that explains if "emscripten-upstream" contain the same content as "emscripten" or "emscripten-slim"?

[trzecieu]

Definitely will do, I'm doing some clean-up and improving documentation on another branch, cheers!