python314/PACKAGING-NOTES

Notes for packagers of Python3
==============================

0. Faster build turnaround
--------------------------

By default, python builds with profile-guided optimization. This needs
an additional run of the test suite and it is generally slow.
PGO build takes around 50 minutes.

For development, use "--without profileopt" option to disable PGO. This
shortens the build time to ~5 minutes including test suite.

1. import_failed.map
----------------------

This is a mechanism installed as part of python3-base, that places shim modules
on python's path (through a generated zzzz-import-failed-hooks.pth file, so that
it is imported as much at the end as makes sense; and an _import_failed subdir
of /usr/lib/pythonX.Y). Then when the user tries to import a module that is part
of a subpackage, the ImportError will contain a helpful message telling them
which missing subpackage to install.

This can sometimes cause problems on non-standard configurations, if the pth
gets included too early (for instance if you are using a script to include all
pths by hand in some strange order). Just something to look out for.
- Update to the second development version of 3.14.0a2. - Tools/Demos - gh-126807: Fix extraction warnings in pygettext.py caused by mistaking function definitions for function calls. - gh-126167: The iOS testbed was modified so that it can be used by third-party projects for testing purposes. - Tests - gh-126909: Fix test_os extended attribute tests to work on filesystems with 1 KiB xattr size limit. - gh-125730: Change make test to not run GUI tests by default. Use make ci to run tests with GUI tests instead. - gh-124295: Add translation tests to the argparse module. - Security - gh-126623: Upgrade libexpat to 2.6.4 - Library - gh-85957: Add missing MIME types for images with RFCs: emf, fits, g3fax, jp2, jpm, jpx, t38, tiff-fx and wmf. Patch by Hugo van Kemenade. - gh-126920: Fix the prefix and exec_prefix keys from sysconfig.get_config_vars() incorrectly having the same value as sys.base_prefix and sys.base_exec_prefix, respectively, inside virtual environments. They now accurately reflect sys.prefix and sys.exec_prefix. - gh-67877: Fix memory leaks when regular expression matching terminates abruptly, either because of a signal or because memory allocation fails. - gh-125063: marshal now supports slice objects. The marshal format version was increased to 5. - gh-126789: Fixed the values of sysconfig.get_config_vars(), sysconfig.get_paths(), and their siblings when the site OBS-URL: https://build.opensuse.org/package/show/devel:languages:python:Factory/python314?expand=0&rev=23 2024-11-19 22:16:13 +00:00			`Notes for packagers of Python3`
			`==============================`

			`0. Faster build turnaround`
			`--------------------------`

			`By default, python builds with profile-guided optimization. This needs`
			`an additional run of the test suite and it is generally slow.`
			`PGO build takes around 50 minutes.`

			`For development, use "--without profileopt" option to disable PGO. This`
			`shortens the build time to ~5 minutes including test suite.`

			`1. import_failed.map`
			`----------------------`

			`This is a mechanism installed as part of python3-base, that places shim modules`
			`on python's path (through a generated zzzz-import-failed-hooks.pth file, so that`
			`it is imported as much at the end as makes sense; and an _import_failed subdir`
			`of /usr/lib/pythonX.Y). Then when the user tries to import a module that is part`
			`of a subpackage, the ImportError will contain a helpful message telling them`
			`which missing subpackage to install.`

			`This can sometimes cause problems on non-standard configurations, if the pth`
			`gets included too early (for instance if you are using a script to include all`
			`pths by hand in some strange order). Just something to look out for.`