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Nikhil Shetty authored
There were a bunch of MPI tests failing when tests were built using Testing/External. This was because MPI support was not brought in. In VTK this support was brought in throught code in Parallel/MPI/CMakeLists.txt. and since vtkMPIParallel was the root modules for all MPI based modules it ensured that the environment was brought in for every MPI based modules. The MPI testing support logic was separated into another file named vtkTestingMPISupport.cmake which was included at appropriate locations. Change-Id: I2fa4cb023b77eb9aeb5c818e3625263b616ca42b
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