Your message dated Sun, 21 Dec 2025 21:35:59 +0000
with message-id <[email protected]>
and subject line Bug#1093869: fixed in dh-python 6.20251221
has caused the Debian Bug report #1093869,
regarding pybuild setuptools: enable parallel building of extensions via
DIST_EXTRA_CONFIG
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1093869: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1093869
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: dh-python
Version: 6.20240603
Severity: wishlist
File: /usr/share/dh-python/pybuild
X-Debbugs-Cc: [email protected], [email protected]
Dear Maintainers,
Please enhance pybuild (when using setuptools via the default plugin, or when
using the pyproject plugin and the build backend is also setuptools) to build
Python extensions in parallel when DEB_BUILD_OPTIONS contains the 'parallel=N'
directive.
This can be accomplished by making a temporary file using the following template and
setting the environment variable DIST_EXTRA_CONFIG [0] to the path of the temporary file.
This is similar to the ".pydistutils.cfg" trick used in the pybuild distutils
plugin [1].
cat > extra-setup.cfg <<EOF
[build_ext]
parallel=N
EOF
Where N is the value of "parallel" set in DEB_BUILD_OPTIONS.
One presume that dh-python will also respect the common "--parallel", "--no-parallel",
and "--max-parallel" debhelper flags when setting up the pybuild invocation.
Doing this technique directly, I measured a speed up of 32% for the mypy
package [2] when in multi-file mode on a server with a large core count.
I would send a merge request, or attach a patch, but it is unclear where the
authors and maintainers of dh-python would like this logic to go. Feel free to
give advice.
This technique is an adaptation of this Gentoo blog post. Many thanks to the
author, Michał Górny, for it:
https://blogs.gentoo.org/mgorny/2024/03/15/optimizing-parallel-extension-builds-in-pep517-builds/
[0] Historically undocumented, but now is documented at
https://setuptools.pypa.io/en/latest/deprecated/distutils/configfile.html#writing-the-setup-configuration-file
[1]
https://salsa.debian.org/python-team/tools/dh-python/-/blob/b0fd6c5391a232374cdb2371139bbbbc61aad890/dhpython/build/plugin_distutils.py#L32-60
[2]
https://salsa.debian.org/python-team/packages/mypy/-/commit/dc6fcce96341163fba81ed46a3990e28fe27bbe5
Cheers,
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--- End Message ---
--- Begin Message ---
Source: dh-python
Source-Version: 6.20251221
Done: Stefano Rivera <[email protected]>
We believe that the bug you reported is fixed in the latest version of
dh-python, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Stefano Rivera <[email protected]> (supplier of updated dh-python package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Sun, 21 Dec 2025 17:07:09 -0400
Source: dh-python
Architecture: source
Version: 6.20251221
Distribution: unstable
Urgency: medium
Maintainer: Piotr Ożarowski <[email protected]>
Changed-By: Stefano Rivera <[email protected]>
Closes: 1093869 1100737 1119036 1123536
Changes:
dh-python (6.20251221) unstable; urgency=medium
.
[ Michael R. Crusoe ]
* Enable parallel building of setuptools extensions, both with the distutils
backend and the pyproject backend. Parallel building is only enabled
if "parallel=N" is present in DEB_BUILD_OPTIONS in accordance with
Debian policy § 4.9.1. (Closes: #1093869)
.
[ Stefano Rivera ]
* Remove tox 3 support.
* Add Type annotations and blacken the codebase.
* Some related code-base refactoring and cleanup.
* Prepend python3-supported-min (>= 3.13.1) | before packages requiring a
minimum Python version. (Closes: #1119036)
* Keep platform requirements if they apply to one of several supported
environments. (Closes: #1100737)
* Drop GNU/kFreeBSD from supported platforms.
* Ignore blank lines in pybuild.testfiles. (Closes: #1123536)
* Update cpython3_fallback.
* Add --test-unittest to explicitly select the unittest runner.
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