Are MPI datatypes like MPI_INT and MPI_CHAR guaranteed to be compile-time constants? Is this defined by the MPI standard, or in the Open MPI implementation?
I've written some template code where MPI datatypes are constexpr members, which requires that they be known at compile time. This works in Open MPI and MPICH, but not in Spectrum MPI--I'm not sure what they've done that breaks this, but I'm trying to file a bug and any information you have about whether these are compile-time constants would be useful. Ben
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