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Build the CIRCT Python bindings (llvm/circt lib/Bindings/Python) for riscv64. Mirrors upstream's uploadWheels.yml: cibuildwheel over lib/Bindings/Python with the build frontend, one job per interpreter (cp313, cp314), each compiling LLVM/MLIR/CIRCT from the llvm submodule. Runs upstream's integration_test/Bindings/Python lit suite against the installed wheel, and stages the LLVM, nanobind and robin-map licences that upstream's wheel omits.
luhenry
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Both build legs of the first run died about 7h in, on two different runners within four minutes of each other, with "The self-hosted runner lost communication with the server" and no log. No other package lost a runner that way in the preceding two weeks, so the build itself exhausted the runner's 15GB. Upstream's setup.py runs `cmake --build .` (ninja's default -j6 on the 4-core runners) and only passes -DLLVM_USE_LINKER=lld when lld is on PATH, so on manylinux every LLVM/MLIR/CIRCT link went through ld.bfd. Install lld so setup.py takes its own lld path, and cap the build with CMAKE_BUILD_PARALLEL_LEVEL=3.
luhenry
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October 10, 2026 20:40
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circt1.157.0Compiles LLVM, MLIR and CIRCT from the pinned
llvmsubmodule into the CIRCT Python bindings (nanobind). Upstream publishes no riscv64 wheel.Mirrors upstream's
uploadWheels.yml.Differs from upstream
lldin the image so upstream'ssetup.pytakes its own-DLLVM_USE_LINKER=lldpath instead of linking LLVM/MLIR/CIRCT with ld.bfd.CMAKE_BUILD_PARALLEL_LEVEL=3instead of ninja's default (6 on the 4-core runners): the first run lost both runners about 7h in, which no other package hit in the preceding two weeks, so it exhausted the runner's 15GB.Matrix: cp313, cp314 - upstream's own set; each leg is a full LLVM/MLIR/CIRCT build.
Testing
integration_test/Bindings/Pythonlit suite against the installed wheel instead.llvmpackage; upstream uses its build tree's.License: Wheel bundles LLVM/MLIR (Apache-2.0 WITH LLVM-exception), nanobind (BSD-3-Clause) and robin-map (MIT); upstream ships no licence text for them, so the build adds it.