Building CargoPythonBundle EasyConfigs fails because of maturin error

[Thyre]

While working on easybuilders/easybuild-easyblocks#3472, I ran into issues with jiter-0.4.1-GCCcore-12.3.0.eb and pydantic-2.9.1-GCCcore-13.3.0.eb.

In both cases, maturin would fail with the following error message:

Python interpreter should be a kind of interpreter (e.g. 'python3.8' or 'pypy3.9') when cross-compiling, got path to interpreter: <EB_PREFIX>/software/Python/3.11.3-GCCcore-12.3.0/bin/python

  Preparing metadata (pyproject.toml): started
  Preparing metadata (pyproject.toml): finished with status 'error'
  error: subprocess-exited-with-error

   Preparing metadata (pyproject.toml) did not run successfully.
   exit code: 1
  > [6 lines of output]
       Found pyo3 bindings
       maturin failed
        Caused by: Python interpreter should be a kind of interpreter (e.g. 'python3.8' or 'pypy3.9') when cross-compiling, got path to interpreter: /tank/Programs/Linux/EasyBuild/datenlager/Software/software/Python/3.11.3-GCCcore-12.3.0/bin/python
      Error running maturin: Command '['maturin', 'pep517', 'write-dist-info', '--metadata-directory', '/tmp/eb-ibucduig/pip-modern-metadata-debc3bzs', '--interpreter', '/tank/Programs/Linux/EasyBuild/datenlager/Software/software/Python/3.11.3-GCCcore-12.3.0/bin/python']' returned non-zero exit status 1.
      Checking for Rust toolchain....
      Running `maturin pep517 write-dist-info --metadata-directory /tmp/eb-ibucduig/pip-modern-metadata-debc3bzs --interpreter /tank/Programs/Linux/EasyBuild/datenlager/Software/software/Python/3.11.3-GCCcore-12.3.0/bin/python`
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

 Encountered error while generating package metadata.
> See above for output.

I'm clearly not running on a cross-compiling machine, using my private system with an AMD Ryzen 7800X3D and my home-server with an AMD Ryzen 3700X. I don't know what's going wrong here...

A gist of a test-build can be found here: https://gist.github.com/Thyre/abd4413683d3801209f2daa0a6d77ed8

[boegel]

@Thyre What type of filesystem is /tank? Maybe there's related here...

Something is definitely tripping up some check that's being done by maturin

[Thyre]

@Thyre What type of filesystem is /tank? Maybe there's related here...

Something is definitely tripping up some check that's being done by maturin

It is an OpenZFS filesystem. On my personal system, it also fails with ext4 on a separate SSD (mounted at /data).

[Thyre]

The issue occurs because ARCHFLAGS is set on my systems. I think we may want to unset that variable to make sure that building works regardless of the users environment. The error thrown by maturin certainly doesn't help.

PyO3/maturin#2101 (comment)