[vtk-developers] How to determine if a module is available without a cmake error

[Bill Lorensen]

How to determine ia a module is present in a built VTK without generating a
cmake error?

Find_Package(VTK COMPONENTS vtkXXX) will report a cmake error if vtkXXX is
not present.

I thought I could do this:

Find_Package(VTK QUIET COMPONENTS vtkXXX)
if (NOT VTK_FOUND)
  message(STATUS "Warning vtkXXX is required but not available")
endif()

but Find_Package(VTK QUIET COMPONENTS vtkXXX) also reports an error.

CMake Error at CMake/vtkModuleAPI.cmake:90 (message):
  Requested modules not available:

    vtkXXX
Call Stack (most recent call first):
  /Users/lorensen/ProjectsGIT/VTK-build/VTKConfig.cmake:72
(vtk_module_config)
  /Applications/CMake
2.8-7.app/Contents/share/cmake-2.8/Modules/FindVTK.cmake:73 (FIND_PACKAGE)
  Examples/CMakeLists.txt:10 (FIND_PACKAGE)

I want to disable certain builds if a given component is missing.

Bill
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