[Bug 1573234] Re: unable to link: cannot find libvtkproj4

[Marc Deslauriers]

So the vtk6 change adds a new dependency, which makes pcl build with the
system libproj. While switching pcl to the system libproj may be
considered a significant change, nothing much actually uses pcl. The
only reverse depends is ros-perception, which is the software this bug
is attempting to fix in the first place, so I believe changing this is
fine.

ACK on the debdiffs. I've uploaded vtk6 for processing by the SRU team.

Once it has been released, we can do the pcl no-change rebuild.

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Title:
  unable to link: cannot find libvtkproj4

Status in pcl package in Ubuntu:
  New
Status in vtk6 package in Ubuntu:
  Fix Released
Status in pcl source package in Xenial:
  Confirmed
Status in vtk6 source package in Xenial:
  In Progress

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]

   * Build software that uses PCL (e.g. https://github.com/ros-
  perception/perception_pcl) and watch it fail

   * Apply this patch, build and install vtk6-dev, then rebuild PCL
  using it. Then watch your previous build failure 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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