Tpetra: CMake output about CUDA-aware MPI should talk about environment variable that controls this behavior at run time
Created by: mhoemmen
Request by @amklinv : Tpetra attempts to detect at configure time whether the MPI implementation is CUDA aware. If that detection fails, Tpetra will assume by default that MPI is not CUDA aware. That's OK, but it would be helpful for the warning message to say that Tpetra has an environment variable that users can set to override the default setting.