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The following options can be use with the --enable-comms= option to target different communication interfaces:

<comm>	Description
none	no communications
mpi[-auto]	MPI communications
mpi3[-auto]	MPI communications using MPI-3 shared memory
shmem	Cray SHMEM communications

For mpi and mpi3 the optional -auto suffix instructs the configure scripts to determine all the necessary compilation and linking flags. This is done by extracting the informations from the MPI wrapper specified in the environment variable MPICXX (if not specified configure will scan though a list of default names).

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