ENH: Support building with system Eigen3 >= 5#5590
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Eigen3 changed their version scheme in 5.0.0 to exclude the world version[^1] which makes CMake see it as an incompatible major version. To allow newer versions, perform an unversioned find_package and follow up with a version check. [^1]: https://gitlab.com/libeigen/eigen/-/releases/5.0.0#versioning
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dzenanz
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Looks good on a glance. I would like to leave decision to Pablo.
phcerdan
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Nov 4, 2025
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Thanks @cho-m |
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Eigen3 changed their version scheme in 5.0.0 to exclude the world version1 which makes CMake see it as an incompatible major version. To allow newer versions, perform an unversioned find_package and follow up with a version check.
Only handles system Eigen as was looking into this for Homebrew (Homebrew/homebrew-core#246477).
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Footnotes
https://gitlab.com/libeigen/eigen/-/releases/5.0.0#versioning ↩