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[Dylan Aïssi <daissi@xxxxxxxxxx>]

** Also affects: eigen3 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: eigen3 (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1750794

Title:
  eigen3-dev crashes because unstable

Status in eigen3 package in Ubuntu:
  Fix Released
Status in eigen3 source package in Xenial:
  New

Bug description:
  Description:	Ubuntu 16.04.3 LTS
  Release:	16.04

  libeigen3-dev:
    Installed: 3.3~beta1-2
    Candidate: 3.3~beta1-2
    Version table:
   *** 3.3~beta1-2 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
          500 http://us.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
          100 /var/lib/dpkg/status

  
  The official version shipped with Ubuntu 16.04 LTS is an unstable branch of Eigen 3.3 (i.e. Eigen 3.3-beta1)

  This is very inconvenient for a LTS version of Ubuntu, considering
  that even the following simple code gives SEGFAULT:

  #include <iostream>
  #include <Eigen/Dense>

  using namespace std;
  using namespace Eigen;

  int main()
  {
      Eigen::Vector3d b = Eigen::Vector3d::Random();
      Eigen::MatrixXd A = Eigen::MatrixXd::Random(3,3);

      std::cout << "The following code crashes from Eigen 3.3-beta1 to Eigen 3.3-RC1" << std::endl;
      std::cout << -A*b << std::endl;

      return 0;
  }

  I strongly suggest either to upgrade to the stable branch of 3.3 (i.e.
  3.3.4) or the stable branch of the 3.2 (i.e., 3.2.10), for which the
  problem doesn't hold.

  Note that I'd rather prefer not to install one of these stable
  versions myself, because lots of other packages for this release are
  built on top on the libeigen3-dev.

  If I link those packages against my custom libraries, I would have two
  different versions of Eigen to co-exist in the same binary.

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