Work around cibuildwheel failures for Linux that are a byproduct of Pillow version 11.3.0 released on 2025-07-01 #830
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The work around works like this: we pip-install a version of Pillow < 11.3 using the `before-test` option of cibuildwheel, so that when cibuildwheel does its pip-install of the qsimcirq package that it built, the Pillow dependency is satisfied. This works because the requirement of Pillow in Matplotlib does not require 11.3; it just requires a version higher than 9, which our pre-installation of Pillow satisfies. This should be a temporary workaround only. We should update qsim to use cibuildwheel 3 and manylinux_2_28 – this problem may go away at that point.
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Closing because as of 2 days ago, the Pillow maintainers kindly reinstated manylinux2014 wheels on PyPI. |
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The Python package Pillow is required by Matplotlib, which is a transitive dependency for qsim due to its requirement by cirq-core. Matplotlib does not pin the required version of Pillow (which is fine, and actually makes it possible to work around the current problem possible – see below). Unfortunately, as a result of changes introduced in Pillow version 11.3.0, our cibuildwheel runs are now failing for Linux because:
Ours is not the only project suddenly facing this problem today (c.f. python-pillow/Pillow#9057).
In our case, the problem only manifests during the "Testing wheel …" phase on Linux. I tried many ways of passing pip constraints, but couldn't find a way to make the constraints take effect during the wheel-testing phase. Finally, the following approach worked: pip-install a version of Pillow < 11.3 using the
before-testoption of cibuildwheel, so that when cibuildwheel does its pip-install of the qsimcirq package that it built, the Pillow dependency is satisfied. This works because the requirement of Pillow in Matplotlib does not require 11.3; it just requires a version higher than 9, which our pre-installation of Pillow satisfies.This should be a temporary workaround only. We should update qsim to use cibuildwheel 3 and manylinux_2_28 – this problem may go away at that point.