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lib3mf publishes one Linux wheel, py3-none-manylinux2014_x86_64. The tag has no ABI half because the package ships no extension module: the whole API is the ACT-generated ctypes wrapper Lib3MF.py driving lib3mf.so, a 5.3 MB C++ shared library. The platform half is load-bearing all the same, so riscv64 needs a real build rather than a retag. The distribution is cut from 3MFConsortium/lib3mf_python, a packaging repo the source tree never references; the workflow mirrors its python-package.yml. That repo commits lib3mf.so as an x86_64 binary, lifted by prepare_pypi_release.py out of the lib3mf_sdk_v<version>.zip release asset, and the SDK is published for x86_64 Linux only. The library is BSD-3-Clause C++ with a plain CMake build and no architecture gates, so the job builds it from 3MFConsortium/lib3mf at the matching tag with upstream's own cmake/GenerateMake.sh, drops the result over the committed binary and then runs upstream's build_wheels.py unchanged. The patch adds riscv64 to the two hardcoded x86_64 tables that stop that working: setup.py's SUPPORTED_PLATFORMS gate, and get_platform_tag(), which returns the glibc 2.17 manylinux2014 baseline for every Linux host where riscv64's oldest profile is glibc 2.39. zlib, libzip and cpp-base64 are compiled into lib3mf.so and fast_float is inlined into it, so their licences are staged at the project root for setuptools' default glob to ship - upstream's own wheels carry only the binding's BSD licence. Nothing GPL is vendored: the library links libstdc++, libgcc_s, libm and libc and nothing else, exactly as the released x86_64 binary does. Tests are the packaging repo's own: the import and wrapper handshake its CI runs, plus its create_cube example (a full mesh build and 3MF write) and its interpreter-shutdown regression test.
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cmake --build's default target also builds the C++ test suite, which links the vendored libressl in Libraries/ - several thousand extra translation units that never reach the wheel. LIB3MF_TESTS=OFF is the project's own switch for that and leaves lib3mf.so byte-for-byte the library the wheel needs. Cover what the C++ suite would have covered on the reader side by reading the example's cube.3mf back and checking its geometry, instead of only writing it.
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lib3mf2.5.0Compiles lib3mf, the 3MF Consortium's C++ implementation of the 3D Manufacturing Format, and ships it beside the ACT-generated ctypes wrapper. Upstream publishes no riscv64 wheel.
Mirrors upstream's
python-package.yml.Differs from upstream
lib3mf.sofrom 3MFConsortium/lib3mf at the matching tag - the packaging repo commits an x86_64 binary taken from the SDK release asset, which exists for x86_64 only.ubuntu-latest.LIB3MF_TESTS=OFF- the default target also builds the C++ suite and the libressl it links, neither of which reaches the wheel.Matrix: one
py3-nonewheel, as upstream - the package ships no extension module.Testing
create_cubeexample, a read-back of the 3MF it writes, and its interpreter-shutdown regression test to upstream's import check.License: Wheel bundles zlib, libzip, cpp-base64 and fast_float (all permissive); upstream ships no licence text for them, so the build adds it.
Patches
0001-Support-building-the-wheel-on-linux-riscv64.patch-Upstream-Status: To upstream. Without itsetup.pyrefuses to run off x86_64 and the wheel is taggedmanylinux2014_x86_64. Reproduces on any non-x86_64 host.Built on cp312; 4 tests passed.