Bump mpi4py from 4.0.3 to 4.1.2 in /MPI

[dependabot]

Bumps mpi4py from 4.0.3 to 4.1.2.

Release notes

Sourced from mpi4py's releases.

4.1.2

• Fix build issues from breaking changes in setuptools 81.

• Support Windows builds with Meson and Intel MPI.

• PyPy wheels are no longer published.

Full Changelog: mpi4py/mpi4py@4.1.1...4.1.2

4.1.1

• Add MPIABI-aware import hook support.

• Support MPI.ERR_ERRHANDLER with Open MPI.

• Fix Windows build issues with Intel MPI 2021.16.

• Minor fixes and improvements to typing stubs.

• Minor fixes to documentation.

• Publish Python 3.8-3.14 and PyPy 3.11 wheels.

• PyPy 3.10 (EOL) wheels are no longer published.

4.1.0

• New features:

  • Publish binary wheel packages on PyPI with support for multiple operating systems (Linux, macOS, Windows), processor architectures (AMD64, ARM64), MPI implementations (MPICH, Open MPI, and their ABI-compatible derivatives), and Python implementations (CPython, PyPy).
  • Add support for the MPI 5.0 standard.
    • MPI handle serialization with integral values.
    • Fixed-size Fortran LOGICAL datatypes.
    • Query ABI version/info and Fortran ABI info.
  • MPI.Datatype.Create_contiguous now uses BigMPI's approach when using MPI implementations that do not yet support the MPI 4.0 large-count APIs.
  • Add support for MPI.FLOAT16_T and MPI.BFLOAT16_T datatypes. These datatypes are not yet standard but available as extensions in MPI implementations.
  • Add MPI.Status.tomemory to expose the status contents as a memoryview object.

• Enhancements:

  • Support (opt-in via MPI4PY_BUILD_PYSABI) for building with Py_LIMITED_API under Python 3.10+ (requires Cython 3.1+).
  • Support (opt-in via MPI4PY_BUILD_MPIABI) for building with the MPI 5.0 standard ABI and the MPICH or Open MPI legacy ABIs. The MPI extension module will be able to dynamically link at runtime with older versions (down to the MPI 3.0 standard) of the MPI implementation used at compile time. Only available on Linux, macOS, and Windows.
  • Support a buffersize parameter in the MPIPoolExecutor.map() and MPIPoolExecutor.starmap() methods to limit the number of pending tasks.
  • Improve ownership management of DLPack capsules.
  • Reimplement MPI DLL search path on Windows.
  • Minor fixes to typing stubs and documentation.

• Backward-incompatible changes:

  • Python 3.8+ is required.
  • The MPI.Exception class is now a heap type.
  • The types of the MPI.BOTTOM, MPI.IN_PLACE, and MPI.BUFFER_AUTOMATIC are no longer subclasses of int.

Changelog

Sourced from mpi4py's changelog.

Release 4.1.2 [2026-05-16]

• Fix build issues from breaking changes in setuptools 81.

• Support Windows builds with Meson and Intel MPI.

• PyPy wheels are no longer published.

Release 4.1.1 [2025-10-10]

• Add MPIABI-aware import hook support.

• Support MPI.ERR_ERRHANDLER with Open MPI.

• Fix Windows build issues with Intel MPI 2021.16.

• Minor fixes and improvements to typing stubs.

• Minor fixes to documentation.

• Publish Python 3.8-3.14 and PyPy 3.11 wheels.

• PyPy 3.10 (EOL) wheels are no longer published.

Release 4.1.0 [2025-06-25]

• New features:

  • Publish binary wheel packages on PyPI_ with support for multiple operating systems (Linux, macOS, Windows), processor architectures (AMD64, ARM64), MPI implementations (MPICH, Open MPI, and their ABI-compatible derivatives), and Python implementations (CPython, PyPy).

    .. _PyPI: https://pypi.org/project/mpi4py/#files

  • Add support for the MPI 5.0 standard.

    • MPI handle serialization with integral values.
    • Fixed-size Fortran LOGICAL datatypes.
    • Query ABI version/info and Fortran ABI info.

  • MPI.Datatype.Create_contiguous now uses BigMPI_'s approach when using MPI implementations that do not yet support the MPI 4.0 large-count APIs.

... (truncated)

Commits

• 1c40e59 Bump version number to 4.1.2
• 5ad9820 chore: Update changelog
• c9cee66 chore: Update year to 2026
• f75876c GHA: Switch to actions/attest@v4
• 70fb888 GHA: Bump actions/checkout from 5 to 6
• 582c1dd GHA: Update use of actions/setup-python to skip upgrading pip
• a0d4854 CD: PyPy wheels are no longer published
• 7a260c8 CD: Use micromamba==2.5.0-2
• c77e8a2 test: Workaround MPICH 5.0.1 issues with MPI_LONG_DOUBLE
• 7abdae3 test: Skip long-double with MPICH 5.0 on macOS arm64
• Additional commits viewable in compare view

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