point-cloud-utils: add build-point-cloud-utils.yml for riscv64 wheels - #1790
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…egfault Two independent bugs surfaced once the wheel actually built on riscv64: - Every test failed importing _pcu_internal.so with an undefined Eigen::MatrixBase<Vector3f/Vector3d>::cross() symbol. nm -D --undefined-only on the built .so showed these were the only two unexplained undefined symbols. Forces a genuine out-of-line instantiation by taking their address. - With that fixed, tests started passing but the suite then segfaulted partway through on unrelated tests (remove_duplicate_points, mesh_face_areas -- varies by run). A gdb backtrace (gotcha 115) caught it live: SIGSEGV inside PyErr_CheckSignals(), called from OpenMP worker threads with no GIL/Python thread state. Several '#pragma omp for' loops (face_areas.cpp, morton.cpp x4, point_cloud_distance.cpp, point_cloud_normals.cpp) call PyErr_CheckSignals() from every thread on every iteration for Ctrl-C cancellation; only the thread that entered the parallel region from Python may touch the interpreter. This is a pre-existing upstream bug, not riscv64-specific in nature -- it likely races harmlessly elsewhere and reproduces reliably here. See the patch commit messages for the full diagnosis.
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point-cloud-utils0.34.0Compiles a pybind11/numpyeigen C++ extension wrapping libigl, a geogram fork, and a Manifold fork for mesh and point-cloud processing. Upstream publishes no riscv64 wheel.
Mirrors upstream's
build-wheels-and-publish-to-pipy.yml.Differs from upstream
Testing
test_ray_mesh_intersection/test_ray_surfel_intersection- both need the dropped Embree bindingstests+dataand runs pytest - upstream's own CI builds wheels but never tests themLicense: wheel bundles the licences of numpyeigen, Eigen, pybind11, igl, tinyply, tinyobjloader, simde, the Manifold fork, and geogram's own third-party code (LM7, rply, zlib, gzstream, PoissonRecon); LM7 and gzstream are LGPL, the rest MIT/BSD/MPL2/public-domain, and upstream's own wheel ships none of their licence text.
Patches
0001-cmake-treat-riscv64-like-arm64-aarch64-for-the-SSE-v.patch- Inappropriate [riscv64-only build config]. Without it the riscv64 compiler is passed -msse3. Riscv64-only.0002-cmake-keep-geogram-s-HLBFGS-disabled.patch- Inappropriate [avoids redistributing a non-commercial-only licensed dependency]. Without it the wheel bundles non-redistributable code. Reproduces on any arch.0003-build-drop-the-Embree-backed-ray-intersection-bindin.patch- Inappropriate [Embree has no riscv64 ISA]. Without it the build fails to compile on riscv64. Riscv64-only.0004-common-force-out-of-line-Eigen-cross-symbols-on-risc.patch- Inappropriate [riscv64-only linkage workaround]. Without it the wheel fails to import: undefined Eigen::cross() symbol. Riscv64-only.0005-src-only-call-PyErr_CheckSignals-from-the-OpenMP-mas.patch- To upstream [real bug, not riscv64-specific, but this session can't file third-party issues/PRs]. Without it several OpenMP loops segfault calling a Python C-API function from worker threads with no GIL. Reproduces on any arch.Built on cp312; 26 passed, 2 deselected.