I found and issue on uv: llvmlite

I’ve found an issue with uv while creating a simple venv. Nothing fancy with my dependencies. I’ve condensed everything in this issue:

But here is the minimal reproducible example of it:

Terminal window
rm -rf test
uv init test
cd test
uv version
# uv venv && uv pip install numpy statsforecast
uv add numpy statsforecast

For the time being, I’m using the latest release.

Terminal window
$ uv version
uv 0.5.4 (c62c83c37 2024-11-20)

This is what the error looks like:

Terminal window
$ uv init test
Initialized project `test` at `/Users/mgreco/github.com/asdf0x2199/blog/test`
$ cd test
$ uv version
uv 0.5.4 (c62c83c37 2024-11-20)
$ uv add numpy statsforecast
Using CPython 3.12.4
Creating virtual environment at: .venv
Resolved 15 packages in 9ms
  × Failed to download and build `llvmlite==0.36.0`
  ╰─▶ Build backend failed to determine requirements with `build_wheel()`
      (exit status: 1)


      [stderr]
      Traceback (most recent call last):
        File "<string>", line 14, in <module>
        File
      "/Users/mgreco/.cache/uv/builds-v0/.tmpgRNnS8/lib/python3.12/site-packages/setuptools/build_meta.py",
      line 334, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=[])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File
      "/Users/mgreco/.cache/uv/builds-v0/.tmpgRNnS8/lib/python3.12/site-packages/setuptools/build_meta.py",
      line 304, in _get_build_requires
          self.run_setup()
        File
      "/Users/mgreco/.cache/uv/builds-v0/.tmpgRNnS8/lib/python3.12/site-packages/setuptools/build_meta.py",
      line 522, in run_setup
          super().run_setup(setup_script=setup_script)
        File
      "/Users/mgreco/.cache/uv/builds-v0/.tmpgRNnS8/lib/python3.12/site-packages/setuptools/build_meta.py",
      line 320, in run_setup
          exec(code, locals())
        File "<string>", line 55, in <module>
        File "<string>", line 52, in _guard_py_ver
      RuntimeError: Cannot install on Python version 3.12.4; only versions
      >=3.6,<3.10 are supported.


  help: `llvmlite` (v0.36.0) was included because `test` (v0.1.0) depends
        on `statsforecast` (v0.7.1) which depends on `numba` (v0.53.1) which
        depends on `llvmlite`

Workaround

If you are lucky, you can try adding dependencies sequentially.

Terminal window
# the order is important
uv add statsforecast
uv add numpy

In my case, it solved the problem.

You can also keep using pip for this specific case. The good thing about this is that despite the limitation, we cannot simply use:

Terminal window
uv venv
# inverted order of dependencies (simpler at the end)
uv pip install statsforecast numpy

I know that this can be time-consuming on a large dependency list, but maybe it is something worth trying.