ci: Build WebAssembly (wasm32-unknown-emscripten) wheels - #1788
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## main #1788 +/- ##
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Add a `wasm` job to the python-wheels workflow that cross-compiles the tket Python extension to `wasm32-unknown-emscripten`, producing pyodide-compatible wheels. - build.rs: recognise the emscripten target and skip linking a system `stdc++` (the `em++` linker driver provides its own libc++). The wasm tket-c-api archive is consumed via TKET_C_API_PATH. - python-wheels.yml: new `wasm` job using nightly Rust with `-Zbuild-std`, emsdk 5.0.3 and Python 3.14, fetching the prebuilt emscripten tket-c-api from hugrverse-env via the install-hugrenv-action `target: emscripten_wasm32` input. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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doug-q
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Aug 24, 2026
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Looks good, just a couple comments
| .convert_pyerrs()?; | ||
| // Emscripten wheels are built with `rayon` disabled, so we need to run the | ||
| // pass sequentially in that case. | ||
| if cfg!(target_os = "emscripten") { |
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This is a weird way to do it. Rayon doesn't look like it's disabled in Cargo.toml.
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Yeah, it's mostly that running par_iter_mut on emscripten fails at runtime:
The global thread pool has not been initialized:
ThreadPoolBuildError {
kind: IOError(Os {
code: 6,
kind: WouldBlock,
message: "Resource temporarily unavailable"
})
}
I'll update the comment
cqc-alec
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Co-authored-by: Alec Edgington <54802828+cqc-alec@users.noreply.github.com>
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Adds a
wasmjob to the Python wheels workflow that cross-compiles the tket Python extension towasm32-unknown-emscripten, producing pyodide-compatible WebAssembly wheels. Implements #1415.Targets Emscripten 4.0.9 / Python 3.13 (pyodide
pyemscripten_2025_0ABI), to match hugr's wasm wheelsI tested these locally with emscripten, and in a guppy-playpond instance.
Note that the
pytketpython wheel is not available in WASM, buttket's pytket-based pass work correctly as they use an internally compiledtket-c-api.Wheel building run: https://github.com/Quantinuum/tket2/actions/runs/33096483912/job/98602665474