Bug#1136234: g2o: FTBFS with libeigen3-dev 5.0 (major version transition)

[Anton Gladky]

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Package: src:g2o
Version: 0~20230806-5
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

g2o FTBFS with libeigen3-dev 5.0.1. The full build log is available at:

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3755814/

Here is the most probably relevant part of the failing build log:
    ===========================================
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 sbuild-build-depends-main-dummy : Depends: debhelper (>= 11) but it is not going to be installed
                                   Depends: cmake but it is not going to be installed
                                   Depends: libopenblas-dev but it is not going to be installed
                                   Depends: libsuitesparse-dev but it is not going to be installed
                                   Depends: libopengl-dev but it is not going to be installed
                                   Depends: libqglviewer-headers but it is not going to be installed
                                   Depends: libeigen3-dev but it is not going to be installed
                                   Depends: libglut-dev but it is not going to be installed
                                   Depends: libtbb-dev but it is not going to be installed
                                   Depends: libmetis-dev but it is not going to be installed
                                   Depends: libceres-dev but it is not going to be installed
                                   Depends: libgmock-dev but it is not going to be installed
E: Unable to satisfy dependencies. Reached two conflicting assignments:
   1. libceres-dev:amd64 is selected for install because:
      1. sbuild-build-depends-main-dummy:amd64=0.invalid.0 is selected for install
      2. sbuild-build-depends-main-dummy:amd64 Depends libceres-dev
   2. libceres-dev:amd64 Depends libeigen3-dev (< 3.4.1)
      but none of the choices are installable:
      - libeigen3-dev:amd64=3.4.0-5 is not selected for install
apt-get failed.
E: Package installation failed

    ===========================================
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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