Multiple swig test failures while building with SWIG 4.4.1 on Darwin

[sarahec]

Description of the bug

While building 1.27.2.3 for nixpkgs, with mupdf 1.27.2 and SWIG 4.4.1, a large number of tests fail on Darwin with code generation warnings (AssertionError: wt="generic error: SWIG director type mismatch in output...").

See https://hydra.nixos.org/build/327115294

How to reproduce the bug

nix-build -A python3Packages.pymupdf --option sandbox false
...
ERROR tests/test_font.py::test_load_system_font - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_add_ink_annot - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_2533 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_2506 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_2093 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_general.py::test_2430 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_general.py::test_2553 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_general.py::test_2736 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_general.py::test_subset_fonts - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_2957_2 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_general.py::test_707560 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_3140 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_3654 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_3624 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_4415 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_4496 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_4590 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_4712 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_4712m - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_general.py::test_4902 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_imagebbox.py::test_bboxlog - AssertionError: wt='dropping unclosed PDF processor\n... repeated 2 times.....
ERROR tests/test_insertpdf.py::test_issue1417_insertpdf_in_loop - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_mupdf_regressions.py::test_707673 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_mupdf_regressions.py::test_3376 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_nonpdf.py::test_pageids - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_objectstreams.py::test_objectstream1 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_objectstreams.py::test_objectstream2 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_objectstreams.py::test_objectstream3 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_pagedelete.py::test_3094 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_pixmap.py::test_pdfpixmap - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_pixmap.py::test_3854 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_pixmap.py::test_4155 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_pixmap.py::test_4699 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_remove-rotation.py::test_remove_rotation - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_spikes.py::test_spikes - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_story.py::test_story - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_story.py::test_2753 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_story.py::test_fit_springer - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_story.py::test_write_stabilized_with_links - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_story.py::test_3813 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_tables.py::test_2979 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_tables.py::test_strict_lines - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_tables.py::test_3148 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_tables.py::test_battery_file - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_tables.py::test_dotted_grid - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_textbox.py::test_textbox4 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_textbox.py::test_2637 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_textbox.py::test_htmlbox1 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_textbox.py::test_htmlbox2 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_textbox.py::test_htmlbox3 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_textbox.py::test_3559 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_textbox.py::test_3916 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_textbox.py::test_4613 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_textextract.py::test_extract4 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_textextract.py::test_3197 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_textextract.py::test_3705 - AssertionError: wt="unknown epub version: 3.0\ngeneric error: SWIG director...
ERROR tests/test_textextract.py::test_4147 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_textextract.py::test_4179 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_textextract.py::test_extendable_textpage - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...
ERROR tests/test_textextract.py::test_4503 - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_toc.py::test_simple_toc - AssertionError: wt="generic error: SWIG director type mismatch in output va...
ERROR tests/test_toc.py::test_3400 - AssertionError: Warnings text not empty: wt="generic error: SWIG director t...

PyMuPDF version

1.27.2.3

Operating system

No response

Python version

No response

[samestep]

I'm getting the same test failures on version 1.27.2.2, so this doesn't seem 1.27.2.3-specific.

[sarahec]

@samestep thank you. I see you're also a nix maintainer. Since 1.27.2.2 was building and testing at the point I committed it (I just double-checked), and it's not building now, I'll bisect back to that point and find the failure. I wonder if it's a SWIG version bump that caused it.

[julian-smith-artifex-com]

swig/swig/issues/3279 might be related to this. Though it is slightly different, about Director errors with swig-4.4.1, MacOS and Python<3.13.

[sarahec]

Apologies for the multiple edits. I narrowed this down to an upgrade from swig 4.3.1 -> 4.4.1 and also determined it to be Darwin-only.