Add CI tests for wasm32-emscripten wheels in Pyodide #244
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I'm keeping this as a draft because IMO it needs some improvements before it can merge but I would still appreciate feedback if you get around to it. @messense @davidhewitt |
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Thanks for working on this and sorry for the long delay in review. Been busy either side of falling ill.
Looks solid to me, really cool to see this working. There appears to be a rust_with_cffi failure when trying to build cffi, maybe it makes sense to skip that one for now?
| CARGO_TARGET_WASM32_UNKNOWN_EMSCRIPTEN_LINKER=str( | ||
| emscripten_dir / "emcc_wrapper.py" | ||
| ), | ||
| PYO3_CONFIG_FILE=str(emscripten_dir / "pyo3_config.ini"), |
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From this should I infer that pyo3_build_config doesn't configure for pyodide correctly? Do you think we would be able to upstream a fix?
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From this should I infer that pyo3_build_config doesn't configure for pyodide correctly?
I am not sure. I think it may just be that I don't know how to use the tool correctly. How would I check this?
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So usually in cross-compile situations like for emscripten the pyo3_build_config build scripts will try to look for a sysconfigdata file and configure from that. Alternatively, can set the abi3-py310 feature and then it will do a "standard" cross compile, which might just work.
I view the PYO3_CONFIG_FILE env var as an escape hatch when nothing built-in works, so if either of the above work (or can be made to work) that's probably preferable.
noxfile.py
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| emscripten_dir / "emcc_wrapper.py" | ||
| ), | ||
| PYO3_CONFIG_FILE=str(emscripten_dir / "pyo3_config.ini"), | ||
| RUSTFLAGS=" ".join( |
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It might be worth having a .cargo/config.toml with a [target.wasm32-unknown-emscripten] section for these? Or alternatively setuptools-rust could set them automatically internally?
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Well we are working on upstreaming this stuff:
https://github.com/rust-lang/rust/pulls?q=author%3Ahoodmane
I don't know what the best thing to do before the upstream fixes go in. Unfortunately it looks like the merge window for Rust 1.63.0 is closing today. The fixes will probably go into into 1.64.0.
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Ah, very nice. I think it's ok for us to keep this as-is for now then; if things will eventually "just work" on a new enough rustc I think that's good enough for now.
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This can be simplified quite a lot now similar to this PR on maturin: |
.github/workflows/ci.yml
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| @@ -3,6 +3,7 @@ on: | |||
| push: | |||
| branches: | |||
| - main | |||
| - emscripten-ci2 | |||
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Reminder to remove this when ready to merge.
noxfile.py
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| _PYTHON_SYSCONFIGDATA_NAME="_sysconfigdata__emscripten_wasm32-emscripten", | ||
| _PYTHON_HOST_PLATFORM="emscripten_3_1_14_wasm32", | ||
| CARGO_BUILD_TARGET="wasm32-unknown-emscripten", | ||
| CARGO_UNSTABLE_BUILD_STD="true", |
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Looking at the CI failure and docs for build-std I think this actually might want to be CARGO_UNSTABLE_BUILD_STD="core,alloc,std,proc_macro,test". Or presumably we can drop this soon-ish when your upstream Rust PRs merge.
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Rebased this and removed some of the tweaks which I think are now covered by upstream rustc; let's see if we can get this merged. |
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Hmm, emscripten failing with missing symbols. @hoodmane do you know if there's a flag for allowing the undefined symbols through (presumably they are provided by Pyodide at runtime), similar to |
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I suspect it didn't see |
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Ah in which case I removed too many RUSTFLAGS - thanks 👍 |
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Yeah I think |
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Finally working! |
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Thanks @messense and @davidhewitt! |
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Cheers, appreciate you kicking this off for us, I've got a much better idea how we do (pyodide) support now going forward 👍 |
This is another attempt to add emscripten tests. We generate wheels "by hand" and then test them in Pyodide. This approach could benefit from improvements to Pyodide, it's currently a bit ad-hoc. Would still appreciate review.
The tests work for
html-py-ever,namespace_package, andrust_with_cffi, but I couldn't gethello-worldto build so I am not testing it.