[Paraview] add_executable cannot create imported target "vtkWrapPython"

[Mathieu Malaterre]

Hi all,

  I am trying to build a paraview module. I have VTK 5.8.0 and
ParaView 3.10.1 installed on a linux/debian machine. When importing
both VTK & ParaView cmake module, I am getting the following errors
(truncated):

...
CMake Error at /tmp/pv/usr/lib/paraview/CMake/ParaViewTargets.cmake:16
(ADD_EXECUTABLE):
  add_executable cannot create imported target "vtkWrapPython" because
  another target with the same name already exists.
Call Stack (most recent call first):
  /tmp/pv/usr/lib/paraview/ParaViewConfig.cmake:58 (INCLUDE)
  CMakeLists.txt:3 (find_package)


CMake Error at /tmp/pv/usr/lib/paraview/CMake/ParaViewTargets.cmake:19
(ADD_EXECUTABLE):
  add_executable cannot create imported target "vtkWrapPythonInit" because
  another target with the same name already exists.
Call Stack (most recent call first):
  /tmp/pv/usr/lib/paraview/ParaViewConfig.cmake:58 (INCLUDE)
  CMakeLists.txt:3 (find_package)
...


It can easily be reproduced with:

$ cat /tmp/bla/CMakeLists.txt
project(bla)
find_package(VTK REQUIRED)
find_package(ParaView REQUIRED)

Could someone please confirm this is an actual issue ? If so I'll
report that to paraview bug tracker. Meanwhile could someone please
suggest a fix, other than -tediously- adding blockers for each
imported target, eg:

$ cat /usr/lib/paraview/CMake/ParaViewTargets.cmake
...
# Create imported target vtkWrapPython
IF(NOT TARGET vtkWrapPython)
ADD_EXECUTABLE(vtkWrapPython IMPORTED)
ENDIF(NOT TARGET vtkWrapPython)
...

This issue can also be seen when building VTKEdge (svn checkout from 20110819).

Thanks much !
-- 
Mathieu