Re: BLFS 12.4 systemd Cython-3.1.3 Module

On Fri, 2025-09-12 at 09:58 +0100, Vaughan Butler wrote:
> I received a deprecation warning during the build phase of this module
> 
> > DEPRECATION: Building 'Cython' using the legacy setup.py bdist_wheel
> > mechanism, which will be removed in a future version. pip 25.3 will
> > enforce this behaviour change. A possible replacement is to use the
> > standardized build interface by setting the `--use-pep517` option,
> > (possibly combined with `--no-build-isolation`), or adding a
> > `pyproject.toml` file to the source tree of 'Cython'. Discussion can
> > be found at https://github.com/pypa/pip/issues/6334

See https://wiki.linuxfromscratch.org/blfs/ticket/21688.  Per Bruce we
won't take an action unless it's rejected by pip some day.

> The build continued very slowly, but eventually completed successfully, 
> and installed at normal speed.

The speed is unrelated to the warning.  It's slow because a lot of .c
files are compiled without any parallel jobs.

> I decided to check the installed components. The directories were 
> present, and both cython and cythonize worked correctly. However cygdb
> gave an error, 'file not found gdb'. I discovered cygdb is a wrapper for 
> gdb, which I hadn't installed at that point. After installing gdb, cygdb 
> ran normally, invoking gdb.
> 
> I wonder if it is worth pointing out this dependency in the cython build 
> notes?

I don't know, but it should be noted that if we point out this we should
also point it out for rustc (for rust-gdb), systemd (for coredumpctl
debug), and maybe others.

> Incidentally, I have seen the same deprecation warning in other python
> module builds, though without the build slowing down.

So they are unrelated.

-- 
Xi Ruoyao <[email protected]>

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