[BUG] version 0.6.1.6 introduced moocore dependecy imcompatible with python 3.14t

[Deathn0t]

Checklist

• I searched existing issues
• I'm using the latest pymoo version

Bug Description

Hello,

This issue is not so much about an emergency but mostly informational. Python 3.14 release has moved in the direction of "free-threaded python" (removing the GIL). I noticed that the "moocore" package introduced in the dependency of the latest version seems to not be compatible with Python 3.14t.

Minimal Code to Reproduce

Using UV for the installation with the following header to reproduce:

# /// script
# requires-python = ">=3.12"
# dependencies = [
#     "pymoo==0.6.1.6",

# ]
# ///
import pymoo

and the command:

uv run -p 3.14t test.py

Error Message

Snippet of output:

  × Failed to build `moocore==0.1.10`
  ├─▶ The build backend returned an error
  ╰─▶ Call to `setuptools.build_meta.build_wheel` failed (exit status: 1)

PyMoo & Python Version

pymoo 0.6.1.6, Python 3.14t

[tpgillam]

Thanks for flagging this — free-threading support for moocore is being tracked here:

• Build wheels for free-threading Python (3.15?) multi-objective/moocore#37

[MLopez-Ibanez]

moocore doesn't rely on Cython and only uses the Python limited API, so anyone can easily build 3.14t wheels of mocore if you wish to test pymoo using those. However, I'm not sure that pymoo itself is thread-safe so I don't see the point in duplicating the number of wheels that need to be created and tested unless pymoo will actually use them. Moreover, 3.14t wheels will not work for 3.15t, which will probably fix lots of bugs in free-threading. If you do build the wheels and test them please let me know. I do plan to support free-threading python in moocore once it is more stable.

[MLopez-Ibanez]

If you don't know how to build wheels for moocore but will be happy to test them, let me know your OS and I will build 3.14t wheels for you to test.

[Deathn0t]

is it more than python -m build ?

[MLopez-Ibanez]

is it more than python -m build ?

I use cibuildwheel: https://github.com/multi-objective/moocore/blob/3485074037d0e57837a72ffa3f29d5e10e61529a/.github/workflows/python.yml#L195

You have to remove this line:

https://github.com/multi-objective/moocore/blob/3485074037d0e57837a72ffa3f29d5e10e61529a/python/pyproject.toml#L109