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setuptools deprecation warnings #1637

@mgorny

Description

@mgorny

Describe the bug
As of 1.15.2, building the wheel produces the following deprecation warnings:

/usr/lib/pypy3.10/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)
/usr/lib/pypy3.10/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)
/usr/lib/pypy3.10/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 :: MIT License

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

!!
  dist._finalize_license_expression()
/usr/lib/pypy3.10/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 :: MIT License

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

!!
  self._finalize_license_expression()

Expected behavior
No warnings.

To Reproduce

python -m build -w

Versions.

  • OS: Gentoo Linux amd64
  • Python: 3.10.16
  • Alembic: 1.15.2
  • SQLAlchemy: 2.0.40
  • Database: n/a
  • DBAPI: n/a

Additional context

Have a nice day!

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