Bug#1136230: ceres-solver: FTBFS with libeigen3-dev 5.0 (major version transition)

[Anton Gladky]

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Package: src:ceres-solver
Version: 2.2.0+dfsg-4.1
Severity: important
Tags: sid forky ftbfs
User: debian-devel at lists.debian.org
Usertags: eigen3-5.0

Dear Maintainer,

your package depends on libeigen3-dev. The upstream released a
new major version of this mathematical library, 5.0.0. Some
basic information about new features and changes in this version
can be found here:

  https://libeigen.gitlab.io/releases/5.0/

This is a major version change and may require code changes in packages
depending on eigen3. The key breaking changes include:

  - Minimum required C++ standard is now C++14
  - Changes in the build system integration
  - Some API name changes

ceres-solver FTBFS with libeigen3-dev 5.0.1. The full build log is available at:

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3754806/

Here is the most probably relevant part of the failing build log:
    ===========================================
- -- Looking for pow in m - found
- -- Detected Ceres version: 2.2.0 from /build/reproducible-path/ceres-solver-2.2.0+dfsg/include/ceres/version.h
CMake Error at CMakeLists.txt:185 (find_package):
  Could not find a configuration file for package "Eigen3" that is compatible
  with requested version "3.3".

  The following configuration files were considered but not accepted:

    /usr/share/eigen3/cmake/Eigen3Config.cmake, version: 5.0.1
      The version found is not compatible with the version requested.



    ===========================================
libeigen3-dev_5.0.1-1 is available in experimental.

When this package version lands into unstable (probably at the beginning
of June 2026), this bug will be increased in severity to serious.

Thanks,

Anton
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