fix building the python wheel on Mac

[arvidn]

[arvidn]

@AllSeeingEyeTolledEweSew Do you have any idea why setuptools is trying to build an egg? I'm increasingly thinking that building the C++ code via setup.py is a mistake. It's incredibly complex and poorly documented.

I think it would be simpler to just have a python program that configures python for boost build and makes the binary. Then have some thin wrapper to turn a native python module into a wheel (it's not so easy to find out how to do that) and then invoke this for every python version and platform to build a wheel for.

[arvidn]

maybe it's green now, or it's flaky. it used to fail like this: https://github.com/arvidn/libtorrent/actions/runs/14721771065/job/41509430023?pr=7912#step:13:284

NotImplementedError: Support for egg-based install has been removed.

[xavier2k6]

I think the command python setup.py build_ext should be replaced with python pip3 build_ext, if you google NotImplementedError: Support for egg-based install has been removed. you'll see other repo's have had same/similar problem recently

[xavier2k6]

python-setuptools 1:80.0.0-1 dropped support for eggs. Upstream bug report https://dev.gnupg.org/T6784 and similar issue for meson https://github.com/mesonbuild/meson/issues/14522.

[arvidn]

I think the command python setup.py build_ext should be replaced with python pip3 build_ext

It's just not very clear how one would pass in custom build paramters. e.g. python setup.py build_ext --b2-args "asserts=on invariant-checks=full" bdist_wheel --user --prefix=

[DUTNO1]

I think the command python setup.py build_ext should be replaced with python pip3 build_ext

It's just not very clear how one would pass in custom build paramters. e.g. python setup.py build_ext --b2-args "asserts=on invariant-checks=full" bdist_wheel --user --prefix=

I use this to build wheels for libtorrent: python -m build -n -w -C--build-option=build_ext -C--build-option=--b2-args="optimization=speed crypto=openssl cxxstd=17 variant=release threading=multi libtorrent-link=static boost-link=static fpic=on lto=on logging=off alert-msg=off"

[arvidn]

@DUTNO1 that's also failing on MacOS CI, but in a different way:

https://github.com/arvidn/libtorrent/actions/runs/15241712705/job/42862602802?pr=7948#step:14:19

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages/pyproject_hooks/_impl.py", line 402, in _call_hook
    raise BackendUnavailable(
    ...<4 lines>...
    )
pyproject_hooks._impl.BackendUnavailable: Cannot import 'setuptools.build_meta'

ERROR Backend 'setuptools.build_meta:__legacy__' is not available.