SF: define and work around missing MPI_COMBINER_DUP [reconfigure-needed]
A standards-compliant MPI cannot provide MPI_Type_get_envelope without also defining MPI_COMBINER_DUP, because the latter is
SF: define and work around missing MPI_COMBINER_DUP [reconfigure-needed]
A standards-compliant MPI cannot provide MPI_Type_get_envelope without also defining MPI_COMBINER_DUP, because the latter is necessary to interpret the results of the former. However, a version of MPICH1 does exactly this so we need a configure test and a workaround in the code.
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