MPI_F08: error out if fortran FCFLAGs do not work with big count #13572
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jsquyres
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Dec 16, 2025
Without this patch, one can successfully configure OMPI with fortran compiler flags that lead to compilation failures when building the mpi_f08 module. This can happen when the default integer size is the same as KIND=MPI_KIND_COUNT. Add a configure check to error out at that state with a hopefully useful error message: checking if Fortran compiler can compile interface containing MPI_KIND_COUNT arguments ... no configure: error: The MPI_F08 module cannot be compiled using configure Fortran commpiler options. Either change compiler options or use --enable-mpi-fortran=usempi Signed-off-by: Howard Pritchard <howardp@lanl.gov>
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related to open-mpi#13572 Signed-off-by: Howard Pritchard <howardp@lanl.gov>
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related to open-mpi#13572 Signed-off-by: Howard Pritchard <howardp@lanl.gov>
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related to open-mpi#13572 Signed-off-by: Howard Pritchard <howardp@lanl.gov>
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Without this patch, one can successfully configure OMPI with fortran compiler flags that lead to compilation failures when building the mpi_f08 module. This can happen when the default integer size is the same as KIND=MPI_KIND_COUNT.
Add a configure check to error out in that case with a hopefully useful error message:
checking if Fortran compiler can compile interface containing MPI_KIND_COUNT arguments ... no configure: error: The MPI_F08 module cannot be compiled using configure Fortran commpiler options. Either change compiler options or use --enable-mpi-fortran=usempi