[CMake] "find_package(MPI)" overriding "set(MPIEXEC)" in CmakeList.txt

[Pettey . Lucas]

Hello,

On a Cray XE6, I am using find_package(MPI REQUIRED) in my CMakeLists.txt. It correctly finds all of the MPI stuff, except that it sets the MPIEXEC to the login node mpiexec command. I would like to override this behavior and set the MPIEXEC command to the "aprun" wrapper, but it is not working. I have tried using set(MPIEXEC "aprun") both before and after the find_package(MPI REQUIRED) in my CMakeLists.txt.

Thanks
Lucas
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