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excerpt: "Supported communication interfaces"
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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](https://software.intel.com/sites/default/files/managed/eb/54/An_Introduction_to_MPI-3.pdf) |
| `mpi3l[-auto]` | MPI communications using MPI 3 shared memory and leader model |
| `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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