@swap357 thank you for the updates, looks like there are some CI issues to be resolved.

@swap357 seems like the changes introduced in commit with ID 1840367 have created subsequent execution issues within the workflow.

@swap357 thank you for the fixes, I will review this again now.

Testing protocol and results:

a) merged this PR to esc/llvmlite@main: esc@0b15a08

b) used a GHA produced llvmdev from https://github.com/esc/llvmlite/actions/runs/14338724313

c) ran: https://github.com/esc/llvmlite/actions/runs/14354815563

This failed with:

Run actions/download-artifact@v4
  with:
    name: llvmdev_osx-64
    path: llvmdev_conda_packages
    run-id: 143387[2](https://github.com/esc/llvmlite/actions/runs/14354815563/job/40241729660#step:4:2)4313
    repository: esc/llvmlite
    github-token: ***
    merge-multiple: false
  env:
    LOCAL_LLVMDEV_ARTIFACT_PATH: /Users/runner/work/llvmlite/llvmlite/llvmdev_conda_packages
    FALLBACK_LLVMDEV_VERSION: 15
    CONDA_CHANNEL_NUMBA: numba/label/osx_wheel
    VALIDATION_PYTHON_VERSION: [3](https://github.com/esc/llvmlite/actions/runs/14354815563/job/40241729660#step:4:3).12
    ARTIFACT_RETENTION_DAYS: 7
    INPUT_RUN_POST: true
    CONDA: /Users/runner/miniconda3
Downloading single artifact
Error: Unable to download artifact(s): Artifact not found for name: llvmdev_osx-6[4](https://github.com/esc/llvmlite/actions/runs/14354815563/job/40241729660#step:4:4)
        Please ensure that your artifact is not expired and the artifact was uploaded using a compatible version of toolkit/upload-artifact.
        For more information, visit the GitHub Artifacts FAQ: https://github.com/actions/toolkit/blob/main/packages/artifact/docs/faq.md

The error is that the llvmdev builder produces an artifact named llvmdev_for_wheel_osx-64 but the wheel builder is looking for an artifact called llvmdev_osx-64.

Note that the string inserted above llvmdev_osx-6[4] is actually a github bug, it sometimes does weird things to text that is copied into an issue. In fact all of the copied and pasted text is bogus, would suggest to look at the workflow run itself for an unadulterated variant.

Testing protocol for this PR.

a) merged this PR at esc@a3a3bfc

b) using the llvmdev artifact from https://github.com/esc/llvmlite/actions/runs/14338724313

c) launched https://github.com/esc/llvmlite/actions/runs/14360865808 to test this PR

Testing protocol for this PR.

a) merged this PR at esc@a3a3bfc

b) using the llvmdev artifact from https://github.com/esc/llvmlite/actions/runs/14338724313

c) launched https://github.com/esc/llvmlite/actions/runs/14360865808 to test this PR

it passed, this can now be used to generate an artifact for the numba_osx-64_wheel_builder.

FYI: I'm going to need to dismiss @esc 's review because he's not available for a week, and I want to keep this PR moving. If there are additional changes needed, they will have to go into another PR.