Errors When Building from Source

[yangliu2009]

When building dedalus from source on an Intel CPU, I received the following error

      dedalus/core/transposes.c:2146:3: error: unknown type name ‘MPI_Session’
       2146 |   MPI_Session ob_mpi;
            |   ^~~~~~~

This issue reported the same error message for Apple silicon CPUs. How to fix the issue?

[yangliu2009]

The c file "transposes.c" doesn't have
#include "mpi4py/mpi4py.h"
How can transpoes.c find MPI_Session that is defined in mpi4py.h?
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[afraser3]

I believe that the developers ask issues such as this to please be discussed on the google group rather than here. You might try raising this issue there if an initial search reveals this error has not been found before. That said, I wonder if your error is related to this one, and if the fixes documented there might resolve this issue for you as well.

[yangliu2009]

Thanks a lot. The solution resolved the compile issue, i.e.,

1. Download mpi-compat.h to the mpi4py include directory
2. Add the following code in dedalus/core/transposes.pyx

cdef extern from "mpi4py/mpi-compat.h":
    pass

[liamoconnor9]

Hi @yangliu2009 , could specify where exactly you put the mpi-compat.h file? Thank you