While removing the deprecated MacOS-12 runners for GitHub actions, I ran into issues with IREE. The comments suggest that it should work with MacOS version 13, but the tests fail. It seems to work fine one MacOS-14 and Linux.

As a temporary fix, I suggested changed the version in PR #4520

            if (not sys.version_info[:2] == (3, 11)) or mac_ver < 14:
                warnings.warn(
                    (
                        "IREE is only supported on MacOS 13 (or higher) and Python"
                        "version 3.11. Setting PYBAMM_IDAKLU_EXPR_IREE=OFF."
                    ),
                    stacklevel=2,
                )
                return "OFF"

A few other things I noticed while looking into the failures:

• Updating Jax, JaxLib, and IREE requires updating versions in multiple places which is not easy to maintain. This should be centralized somehow
  • jax versions in utils.py and pyproject.toml
  • IREE compiler versions are set in both noxfile.py and pyproject.toml
• Newer versions of Jax/JaxLib have removed support for Python 3.9, so updating Jax and IREE could be difficult until we remove support for python 3.9