3.14t support

[braingram]

I opened #45 to attempt to make 3.14t wheels (since the tests passed locally with 3.14t). Unfortunately the build in the actions failed (see the linked PR).

Is there a plan to build wheels for 3.14t?

Thanks!

[ManonMarchand]

Hi! It looks like it's possible but we'll have a bit of work on our side https://pyo3.rs/main/free-threading
Definitely on our radar

[ManonMarchand]

Advancement: we need to wait for pyerfa (a dependency of astropy). Related issue liberfa/pyerfa#167

Details

× Failed to build pyerfa==2.0.1.5
├─▶ The build backend returned an error
╰─▶ Call to setuptools.build_meta.build_wheel failed (exit status: 1)

  [stdout]
  running bdist_wheel
  running build
  running build_py
  copying erfa/__init__.py -> build/lib.linux-x86_64-cpython-314t/erfa
  copying erfa/version.py -> build/lib.linux-x86_64-cpython-314t/erfa
  copying erfa/core.py -> build/lib.linux-x86_64-cpython-314t/erfa
  copying erfa/helpers.py -> build/lib.linux-x86_64-cpython-314t/erfa
  copying erfa/_version.py -> build/lib.linux-x86_64-cpython-314t/erfa
  copying erfa/tests/__init__.py -> build/lib.linux-x86_64-cpython-314t/erfa/tests
  copying erfa/tests/test_erfa.py -> build/lib.linux-x86_64-cpython-314t/erfa/tests
  copying erfa/tests/test_ufunc.py -> build/lib.linux-x86_64-cpython-314t/erfa/tests
  running build_ext
  building 'erfa.ufunc' extension

  [stderr]
  toml section missing PosixPath('pyproject.toml') does not contain a tool.setuptools_scm section
  toml section missing PosixPath('pyproject.toml') does not contain a tool.setuptools_scm section
  /home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/config/_apply_pyprojecttoml.py:82: SetuptoolsDeprecationWarning: `project.license` as a TOML table is deprecated
  !!

          ********************************************************************************
          Please use a simple string containing a SPDX expression for `project.license`. You can also use `project.license-files`. (Both options available on setuptools>=77.0.0).

          By 2026-Feb-18, you need to update your project and remove deprecated calls
          or your builds will no longer be supported.

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************

  !!
    corresp(dist, value, root_dir)
  /home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/config/_apply_pyprojecttoml.py:55: SetuptoolsDeprecationWarning: 'tool.setuptools.license-files' is deprecated in favor of 'project.license-files' (available on
  setuptools>=77.0.0).
  !!

          ********************************************************************************

          By 2026-Feb-18, you need to update your project and remove deprecated calls
          or your builds will no longer be supported.

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license-files for details.
          ********************************************************************************

  !!
    _apply_tool_table(dist, config, filename)
  /home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/config/_apply_pyprojecttoml.py:61: SetuptoolsDeprecationWarning: License classifiers are deprecated.
  !!

          ********************************************************************************
          Please consider removing the following classifiers in favor of a SPDX license expression:

          License :: OSI Approved :: BSD License

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************

  !!
    dist._finalize_license_expression()
  /home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated.
  !!

          ********************************************************************************
          Please consider removing the following classifiers in favor of a SPDX license expression:

          License :: OSI Approved :: BSD License

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************

  !!
    self._finalize_license_expression()
  Traceback (most recent call last):
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/numpy/_core/__init__.py", line 22, in <module>
      from . import multiarray
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/numpy/_core/multiarray.py", line 11, in <module>
      from . import _multiarray_umath, overrides
  ImportError: /home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/numpy/_core/_multiarray_umath.cpython-314t-x86_64-linux-gnu.so: undefined symbol: PyUnstable_Object_IsUniqueReferencedTemporary

  The above exception was the direct cause of the following exception:

  Traceback (most recent call last):
    File "<string>", line 11, in <module>
      wheel_filename = backend.build_wheel("/home/manon.marchand/.cache/uv/builds-v0/.tmps3UCiY", {}, None)
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/build_meta.py", line 432, in build_wheel
      return _build(['bdist_wheel'])
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/build_meta.py", line 423, in _build
      return self._build_with_temp_dir(
             ~~~~~~~~~~~~~~~~~~~~~~~~~^
          cmd,
          ^^^^
      ...<3 lines>...
          self._arbitrary_args(config_settings),
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      )
      ^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/build_meta.py", line 404, in _build_with_temp_dir
      self.run_setup()
      ~~~~~~~~~~~~~~^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/build_meta.py", line 317, in run_setup
      exec(code, locals())
      ~~~~^^^^^^^^^^^^^^^^
    File "<string>", line 205, in <module>
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/__init__.py", line 115, in setup
      return distutils.core.setup(**attrs)
             ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/core.py", line 186, in setup
      return run_commands(dist)
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/core.py", line 202, in run_commands
      dist.run_commands()
      ~~~~~~~~~~~~~~~~~^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/dist.py", line 1002, in run_commands
      self.run_command(cmd)
      ~~~~~~~~~~~~~~~~^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/dist.py", line 1102, in run_command
      super().run_command(command)
      ~~~~~~~~~~~~~~~~~~~^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/dist.py", line 1021, in run_command
      cmd_obj.run()
      ~~~~~~~~~~~^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/command/bdist_wheel.py", line 370, in run
      self.run_command("build")
      ~~~~~~~~~~~~~~~~^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/cmd.py", line 357, in run_command
      self.distribution.run_command(command)
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/dist.py", line 1102, in run_command
      super().run_command(command)
      ~~~~~~~~~~~~~~~~~~~^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/dist.py", line 1021, in run_command
      cmd_obj.run()
      ~~~~~~~~~~~^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/command/build.py", line 135, in run
      self.run_command(cmd_name)
      ~~~~~~~~~~~~~~~~^^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/cmd.py", line 357, in run_command
      self.distribution.run_command(command)
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/dist.py", line 1102, in run_command
      super().run_command(command)
      ~~~~~~~~~~~~~~~~~~~^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/dist.py", line 1021, in run_command
      cmd_obj.run()
      ~~~~~~~~~~~^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/command/build_ext.py", line 96, in run
      _build_ext.run(self)
      ~~~~~~~~~~~~~~^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/command/build_ext.py", line 368, in run
      self.build_extensions()
      ~~~~~~~~~~~~~~~~~~~~~^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/command/build_ext.py", line 484, in build_extensions
      self._build_extensions_serial()
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/command/build_ext.py", line 510, in _build_extensions_serial
      self.build_extension(ext)
      ~~~~~~~~~~~~~~~~~~~~^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/command/build_ext.py", line 261, in build_extension
      _build_ext.build_extension(self, ext)
      ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/setuptools/_distutils/command/build_ext.py", line 569, in build_extension
      include_dirs=ext.include_dirs,
                   ^^^^^^^^^^^^^^^^
    File "<string>", line 64, in include_dirs
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/numpy/__init__.py", line 112, in <module>
      from numpy.__config__ import show_config
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/numpy/__config__.py", line 4, in <module>
      from numpy._core._multiarray_umath import (
      ...<3 lines>...
      )
    File "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/numpy/_core/__init__.py", line 83, in <module>
      raise ImportError(msg) from exc
  ImportError:

  IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

  Importing the numpy C-extensions failed. This error can happen for
  many reasons, often due to issues with your setup or how NumPy was
  installed.

  We have compiled some common reasons and troubleshooting tips at:

      https://numpy.org/devdocs/user/troubleshooting-importerror.html

  Please note and check the following:

    * The Python version is: Python 3.14 from "/home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/bin/python"
    * The NumPy version is: "2.4.0"

  and make sure that they are the versions you expect.

  Please carefully study the information and documentation linked above.
  This is unlikely to be a NumPy issue but will be caused by a bad install
  or environment on your machine.

  Original error was: /home/manon.marchand/.cache/uv/builds-v0/.tmpVPlYdk/lib/python3.14t/site-packages/numpy/_core/_multiarray_umath.cpython-314t-x86_64-linux-gnu.so: undefined symbol: PyUnstable_Object_IsUniqueReferencedTemporary


  hint: This usually indicates a problem with the package or the build environment.

help: pyerfa (v2.0.1.5) was included because astropy (v7.2.0) depends on pyerfa

How did you build wheels locally for 3.14t ? Did you compile the rust part? (with pip install maturin maturin develop and then pip install .)

[braingram]

Thanks for the update and testing! I also recently learned that astropy doesn't support 3.14t (I'm not aware of any timeline to support it).

astropy/astropy#16916

I just used pip install . (didn't run pip install maturin or maturin develop) to install the package from a local clone of the repo. Let me know if more information is helpful.

[ManonMarchand]

I just used pip install . (didn't run pip install maturin or maturin develop) to install the package from a local clone of the repo. Let me know if more information is helpful.

No that's what I needed to know, thanks. The hard part will be to support it for our rust core (compiled with maturin develop and untouched by a pip install . command)

Maybe this is unrelevant to you, but do you know that cdshealpix already supports multithreading? It's just not done on python's side but it is done by our Rust core. You'll see that most of our methods have a num_thread parameter which you can already use to speed up your calculations.