[Debichem-devel] Bug#1136333: supercell: FTBFS with libeigen3-dev 5.0 (major version transition)

[Anton Gladky]

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Package: src:supercell
Version: 2.1.1+~0.0~git20221028.d8eeb73-4
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

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

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3761958/

Here is the most probably relevant part of the failing build log:
    ===========================================

In file included from /build/reproducible-path/supercell-2.1.1+~0.0~git20221028.d8eeb73/src/core/cif_io.cpp:5:
/build/reproducible-path/supercell-2.1.1+~0.0~git20221028.d8eeb73/src/core/cif_io.h:10:10: fatal error: Eigen/Core: No such file or directory
   10 | #include <Eigen/Core>
      |          ^~~~~~~~~~~~
compilation terminated.
make[3]: *** [src/sc_cli/CMakeFiles/supercell.dir/build.make:82: src/sc_cli/CMakeFiles/supercell.dir/__/core/cif_io.cpp.o] Error 1
make[3]: *** Waiting for unfinished jobs....
In file included from /build/reproducible-path/supercell-2.1.1+~0.0~git20221028.d8eeb73/src/core/common_types.cpp:8:
/build/reproducible-path/supercell-2.1.1+~0.0~git20221028.d8eeb73/src/core/common_types.h:21:10: fatal error: Eigen/Core: No such file or directory
   21 | #include <Eigen/Core>
      |          ^~~~~~~~~~~~
compilation terminated.

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