[Bug]: test suite fails against glib 2.88.0

Bug summary

While running the test suite against glib 2.88.0 / gnome 50, the suite fails with

Code for reproduction

Test suite internal to matplotlib

Actual outcome

[  551s] ERROR test_backend_gtk3.py::test_save_figure_return - gi.PyGIDeprecationWarning: GLib.unix_signal_add_full is deprecated; use GLibUnix.signal_add_full instead
[  551s] = 349 passed, 111 skipped, 9170 deselected, 2 xpassed, 1 error in 201.52s (0:03:21) =
[  551s] error: Bad exit status from /var/tmp/rpm-tmp.RQKIHq (%check)

Expected outcome

Test suite passes

Additional information

No response

Operating system

opensuse Tumbleweed

Matplotlib Version

3.10.8

Matplotlib Backend

No response

Python version

No response

Jupyter version

No response

Installation

None

The issue is self-made inside pygobject/GLib introduced in
https://gitlab.gnome.org/GNOME/pygobject/-/commit/74e4e0f40a66436a55c72d4a6e6058c1f91a7310

matplotlib in turn changes all warnings to errors in pytest_configure:

def pytest_configure(config):
    # config is initialized here rather than in pytest.ini so that `pytest
    # --pyargs matplotlib` (which would not find pytest.ini) works.  The only
    # entries in pytest.ini set minversion (which is checked earlier),
    # testpaths/python_files, as they are required to properly find the tests
    for key, value in [
…
        ("filterwarnings", "error"),

Might be right to ignore gi's internal deprecation warnings here

Thanks for the report!

AFAICS, we do not use unix_signal_add_full directly, so the fix needs to be upstream.

On the plus side, it's only a warning for now, so does not break user code. We still need to take action to unbreak our tests. The right thing to do is filter the warning inside test_save_figure_return.

The issue is self-made inside pygobject/GLib introduced in

Did you report something upstream?

I reported it upstream https://gitlab.gnome.org/GNOME/pygobject/-/work_items/757

And also fixed it upstream https://gitlab.gnome.org/GNOME/pygobject/-/merge_requests/545

Either ask upstream for a new release or backport the patch.

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[Bug]: test suite fails against glib 2.88.0 #31398

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[Bug]: test suite fails against glib 2.88.0 #31398

Description

Bug summary

Code for reproduction

Actual outcome

Expected outcome

Additional information

Operating system

Matplotlib Version

Matplotlib Backend

Python version

Jupyter version

Installation

Activity

DimStar77 commented on Mar 27, 2026

timhoffm commented on Mar 27, 2026

QuLogic commented on Mar 30, 2026

QuLogic commented on Apr 28, 2026

QuLogic commented on May 19, 2026

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