ExternalLibraries/MPI does not auto-detect openmpi on Debian/testing

configure.sh expects to find libmpi.a in $MPI_DIR/lib however Debian no longer delivers a static libmpi.a but only libmpi.so so the tests fails. The fix is likely similar to what HDF5 already does (ie accept any of .a .so .dylib as extensions for libraries). The fix is a bit complex though, so (given that Debian/stable is still fine) this is a reminder for after the release. Explictly specifying MPI_DIR, MPI_INC_DIRS, MPI_LIB_DIRS and MPI_LIBS allows this to be worked around in the current release.

For reference, the fragment from HDF5 looks like this:

    # We look in these directories
    DIRS="/usr /usr/local /usr/local/hdf5 /usr/local/packages/hdf5 /usr/local/apps/hdf5 /opt/local ${HOME} ${HOME}/hdf5 c:/packages/hdf5"
    # look into each directory
    for dir in $DIRS; do
        # libraries might have different file extensions
        for libext in a so dylib; do
            # libraries can be in /lib or /lib64
            for libdir in lib64 lib; do
                # These files must exist
                FILES="include/hdf5.h $(for lib in ${HDF5_CXX_LIBS} ${HDF5_FORTRAN_LIBS} ${HDF5_C_LIBS}; do echo ${libdir}/lib${lib}.${libext}; done)"
                # assume this is the one and check all needed files
                HDF5_DIR="$dir"
                for file in $FILES; do
                    # discard this directory if one file was not found
                    if [ ! -r "$dir/$file" ]; then
                        unset HDF5_DIR
                        break
                    fi
                done
                # don't look further if all files have been found
                if [ -n "$HDF5_DIR" ]; then
                    break
                fi
           done
           # don't look further if all files have been found
           if [ -n "$HDF5_DIR" ]; then
               break
           fi
        done
        # don't look further if all files have been found
        if [ -n "$HDF5_DIR" ]; then
            break
        fi
    done

Keyword: MPI

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