Source: pybind11 Version: 2.7.1-1 Followup-For: Bug #1000780 Sounds like some change was made in eigen3 3.4.0 which now breaks pybind11 (pybind11 3.8.1 also fails the same way).
Not clear at this point if it's a regression in eigen3 that needs to be fixed in eigen3, or an API change that pybind11 needs to patch. But if it was an API problem then you'd expect the failure to show up on other arches. Arch-specific failure sometimes indicates wrong assumptions are made about alignment. "target specific option mismatch" is certainly a clue, suggesting eigen has a target specific API. I'll raise a bug against pybind11 upstream.
