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To: maintonly@bugs.debian.org
From: Anton Gladky &lt;gladk@debian.org&gt;
Subject: purify: FTBFS with libeigen3-dev 5.0 (major version transition)
Message-Id: &lt;20260511203852.CCCF6BE6780@MacBook-Air-von-Anton.local&gt;
Date: Mon, 11 May 2026 22:38:52 +0200 (CEST)
Delivered-To: maintonly@bugs.debian.org

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

Package: src:purify
Version: 5.0.1-3
Severity: important
Tags: sid forky ftbfs
User: debian-devel@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

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

  https://debusine.debian.net/debian/developers-gladk-eigen3/artifact/3760899/

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

/build/reproducible-path/purify-5.0.1/cpp/purify/../purify/IndexMapping.h: In function ‘purify::Sparse&lt;typename T0::Scalar&gt; purify::compress_outer(const T0&amp;)’:
/build/reproducible-path/purify-5.0.1/cpp/purify/../purify/IndexMapping.h:91:17: error: ‘MappedSparseMatrix’ is not a member of ‘Eigen’; did you mean ‘SparseMatrix’? [-Wtemplate-body]
   91 |   return Eigen::MappedSparseMatrix&lt;typename T0::Scalar, Eigen::RowMajor,
      |                 ^~~~~~~~~~~~~~~~~~
      |                 SparseMatrix
/build/reproducible-path/purify-5.0.1/cpp/purify/../purify/IndexMapping.h:91:55: error: expected ‘(’ before ‘,’ token [-Wtemplate-body]
   91 |   return Eigen::MappedSparseMatrix&lt;typename T0::Scalar, Eigen::RowMajor,
      |                                                       ^
      |                                                       (
/build/reproducible-path/purify-5.0.1/cpp/purify/../purify/IndexMapping.h:92:79: error: expected ‘(’ before ‘&gt;’ token [-Wtemplate-body]
   92 |                                    typename Sparse&lt;typename T0::Scalar&gt;::Index&gt;(
      |                                                                               ^
      |                                                                               (

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