[petsc-dev] MPI_UNSIGNED_LONG_LONG in mpiuni.h

[Jed Brown]

Chetan Jhurani <chetan.jhurani at gmail.com> writes:

> Hi,
>
> mpiuni.h does not define MPI_UNSIGNED_LONG_LONG, which leads
> to a problem in defining MPIU_SIZE_T here in petscsys.h.
>
> #if (PETSC_SIZEOF_SIZE_T) == (PETSC_SIZEOF_INT)
> #define MPIU_SIZE_T MPI_UNSIGNED
> #elif  (PETSC_SIZEOF_SIZE_T) == (PETSC_SIZEOF_LONG)
> #define MPIU_SIZE_T MPI_UNSIGNED_LONG
> #elif  (PETSC_SIZEOF_SIZE_T) == (PETSC_SIZEOF_LONG_LONG)
> #define MPIU_SIZE_T MPI_UNSIGNED_LONG_LONG

mpiuni/mpi.h also has this unguarded statement.  Do all Windows
compilers now provide 'long long'?

#define MPI_LONG_LONG_INT    sizeof(long long)

We could make mpiuni define MPIU_SIZE_T itself instead of jumping
through hoops to find the matching type.

Chetan, what's your perspective about using stdint.h?