comm: beef up args checking for some comm constructors #12964
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The MPI_Comm_create_from_group and especially the MPI_Intercomm_create_from_groups functions are recent additions to the standard (MPI 4.0) and users may get confused easily trying to use them. So better parameter checking is needed. Related to open-mpi#12906 where an incorrect code example showed up. Signed-off-by: Howard Pritchard <[email protected]>
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The MPI_Comm_create_from_group and especially the
MPI_Intercomm_create_from_groups functions are recent additions to the standard (MPI 4.0) and users may get confused easily trying to use them.
So better parameter checking is needed.
Related to #12906 where an incorrect code example showed up.