Bug#1136232: dolfin: FTBFS with libeigen3-dev 5.0 (major version transition)

[Anton Gladky]

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Package: src:dolfin
Version: 2019.2.0~legacy20240219.1c52e83-27
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

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

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3755404/

Here is the most probably relevant part of the failing build log:
    ===========================================
- -- Eigen3 version .. found in /usr/include/eigen3, but at least version 3.2.90 is required
CMake Error at /usr/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:290 (message):
  Could NOT find Eigen3 (missing: EIGEN3_VERSION_OK) (Required is at least
  version "3.2.90")
Call Stack (most recent call first):
  /usr/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:654 (_FPHSA_FAILURE_MESSAGE)
  cmake/modules/FindEigen3.cmake:97 (find_package_handle_standard_args)
  CMakeLists.txt:279 (find_package)


- -- Configuring incomplete, errors occurred!
	cd obj-x86_64-linux-gnu && tail -v -n \+0 CMakeCache.txt

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