eigen3 5.0 transition: FTBFS bugs filed

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Dear Debian developers,

Eigen is a widely used C++ template library for linear algebra (matrices,
vectors, numerical solvers). Many packages in Debian across scientific,
robotics, computer vision, geometry, and other domains depend on it via
libeigen3-dev.

I have filed 41 bugs against packages failing to build with libeigen3-dev 5.0.1
(currently in experimental); 39 are still open. Release notes for the new major version:

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

The main breaking changes in 5.0:

  - C++14 is now the minimum required standard; packages still using
    -std=c++11 will fail to build.
  - The CMake integration has been modernized; older CMake properties
    may need updating.
  - Eigen::all and Eigen::last have moved to Eigen::placeholders::all
    and Eigen::placeholders::last.

libeigen3-dev_5.0.1-1 is expected to be uploaded to unstable at the beginning of
June 2026. At that point open FTBFS bugs will be raised to serious.

All filed bugs are tagged:

  User: [email protected]
  Usertags: eigen3-5.0

  Bug-Tracker:
  https://bugs.debian.org/cgi-bin/[email protected]&tag=eigen3-5.0

  UDD:
  https://udd.debian.org/bugs/?release=any&merged=ign&done=ign&fnewerval=7&flastmodval=7&fusertag=only&fusertagtag=eigen3-5.0&fusertaguser=debian-devel%40lists.debian.org&allbugs=1&sortby=id&sorto=asc&format=html#results

Please help to fix those bugs as much as possible to escape package removal from testing.


Thanks,

Anton
-----BEGIN PGP SIGNATURE-----
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=lHvE
-----END PGP SIGNATURE-----