[mpich-discuss] Have constants available in shared library

[Thakur, Rajeev]

> Could you add similar constants to the OpenMPI shared library? 

This list is for MPICH. Open MPI has a different mailing list.

In MPICH, these constants are defined in the mpi.h header file.

Rajeev


> On Apr 14, 2016, at 9:04 AM, Erik Schnetter <schnetter at gmail.com> wrote:
> 
> I am one of the maintainers of the MPI wrapper package for Julia
> <https://github.com/JuliaParallel/MPI.jl>. This package provides Julia
> language bindings for MPI, essentially wrapping various MPI functions,
> comparable to what mpi4py <http://pythonhosted.org/mpi4py/> does for
> Python.
> 
> It is in Julia straightforward to call C functions in a shared
> library. The MPI API is standardized, so that part is straightforward.
> What is not standardized are the values of various constants, such as
> e.g. MPI_INT, MPI_MAX, or MPI_ANY_TAG.
> 
> We currently use a cmake function that builds and runs a small
> executable that outputs the (implementation-specific) values of these
> constants, and auto-generates Julia code that defines these constants.
> We do this when the Julia MPI package is installed or updated. This
> works fine, but I think there could be a better way.
> 
> The HDF5 library <https://www.hdfgroup.org/HDF5/> puts global
> constants into the data section of their library, with names derived
> from the preprocessor constants (with a _g suffix, I believe). This
> makes it straightforward to access the values of these constants at
> run time. For example, there exists a constant H5T_NATIVE_INT_g.
> 
> Could you add similar constants to the OpenMPI shared library? This
> would simplify wrapping the library.
> 
> Thanks,
> -erik
> 
> -- 
> Erik Schnetter <schnetter at gmail.com>
> http://www.perimeterinstitute.ca/personal/eschnetter/
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