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[Mathew Hodson <1573234@xxxxxxxxxxxxxxxxxx>]

** Changed in: pcl (Ubuntu)
       Status: New => Fix Released

** Changed in: pcl (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1573234

Title:
  unable to link: cannot find libvtkproj4

Status in pcl package in Ubuntu:
  Fix Released
Status in vtk6 package in Ubuntu:
  Fix Released
Status in pcl source package in Xenial:
  Fix Committed
Status in vtk6 source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * Any code that links to libraries provided by libpcl1.7 (which
  depends on vtk6) fails to link because it cannot find vtkproj4 (see
  https://github.com/PointCloudLibrary/pcl/issues/1594 for example)

   * This has been fixed in Debian, but in a way that breaks ABI

   * See this change through all the way by adding libproj-dev as a
  dependency to libvtk6-dev, and rebuild pcl such that it uses the
  system libproj instead of the vtk-vendored libproj

   * IMPORTANT: This fix is a two-patch fix, one for vtk6 (adding the
  missing dependency) and one for pcl (a no-change rebuild using the
  earlier patch for vtk6). As a result, they cannot be uploaded into
  -proposed at the same time. vtk6 must happen first, and pcl only once
  vtk6 has been built.

  [Test Case]

   * apt install libvtk6-dev libpcl-dev
   * git clone https://github.com/kyrofa/pcl-sru-test.git
   * cd pcl-sru-test
   * cmake .
   * make

  * You'll first note that it fails to build because it needs libproj-
  dev installed. Apply the first patch (to vtk) in this SRU, rebuild and
  install that version of vtk.

  * Build again, and you'll note that it fails to link to vtkproj4. This
  is libproj that was vendored by vtk, but should not be used at all in
  Xenial (it's actually building against the system libproj). This is
  fixed by the second patch (to pcl) in this SRU, a no-change rebuild
  that causes the cmake config to be regenerated to properly link to the
  system libproj instead of the vtk-vendored libproj. Rebuild and
  install that version of pcl.

   * Finally, the build should succeed.

  [Where problems could occur]

   * This patch doesn't change ABI or API, but does add a dependency

   * Problems could potentially occur if clients worked around this
  issue by hacking their projects to link to vtkproj, but known users
  (ROS) have vendored Debian's fix into their repos as opposed to
  working around the bug, thus regressions seem unlikely

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