rpms/python3.13
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Require at least the same expat version as used during the build

Browse source 
In the past we have had a versioned requirement on expat, e.g.:
https://src.fedoraproject.org/rpms/python3.13/c/c686992b6c25a39d0e4117053ddb669fd5998723
The explanation is still valid: if Python is built with an expat version
with new symbols, and used with an installed older expat, it won't work,
preventing crating new venvs, and many more.
This has happened again now with expat 2.7.2 introducing new symbols.

Reintroduce the versioned requirement and make it future-proof - the
generated version will always match at least the one present in the buildroot
during the Python build.
This commit is contained in:
Karolina Surma 2026-01-06 16:51:22 +01:00
commit 1b3b52c264
1 changed files with 21 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

22
python3.13.spec
View file

@ -49,7 +49,7 @@ URL: https://www.python.org/
#global prerel ...
%global upstream_version %{general_version}%{?prerel}
Version: %{general_version}%{?prerel:~%{prerel}}
Release: 1%{?dist}
Release: 2%{?dist}
License: Python-2.0.1
@ -580,6 +580,22 @@ Recommends: (%{pkgname}-tkinter%{?_isa} = %{version}-%{release} if tk%{?_isa})
# The zoneinfo module needs tzdata
Requires: tzdata
# The requirement on libexpat is generated, but we need to version it.
# When built with a specific expat version, but installed with an older one,
# we sometimes get:
# ImportError: /usr/lib64/python3.X/lib-dynload/pyexpat.cpython-....so:
# undefined symbol: XML_...
# The pyexpat module has build-time checks for expat version to only use the
# available symbols. However, there is no runtime protection, so when the module
# is later installed with an older expat, it may error due to undefined symbols.
# This breaks many things, including python -m venv.
# We avoid this problem by requiring at least the same version of expat that
# was used during the build time.
# Other subpackages (like -debug) also need this, but they all depend on -libs.
%global expat_version %(LANG=C rpm -q --qf '%%{version}' expat.%{_target_cpu} | sed 's/.*not installed/0/')
Requires: expat >= %{expat_version}
%description -n %{pkgname}-libs
This package contains runtime libraries for use by Python:
- the majority of the Python standard library
@ -756,6 +772,7 @@ License: %{libs_license} AND Apache-2.0 AND ISC AND LGPL-2.1-only AND MPL-2.0 AN
Provides: bundled(libb2) = 0.98.1
Provides: bundled(mimalloc) = 2.12
Requires: tzdata
Requires: expat >= %{expat_version}
%description -n python%{pybasever}-freethreading
The provisional Free Threading (PEP 703) build of Python.
@ -1776,6 +1793,9 @@ CheckPython freethreading
# ======================================================
%changelog
* Tue Jan 06 2026 Karolina Surma <ksurma@redhat.com> - 3.13.11-2
- Require at least the same expat version as used during the build time
* Fri Dec 05 2025 Miro Hrončok <mhroncok@redhat.com> - 3.13.11-1
- Update to 3.13.11