[petsc-dev] MPI_Exscan

[Barry Smith]

On Jul 28, 2011, at 11:55 AM, Jose E. Roman wrote:

> We are getting an undefined reference `MPI_Exscan'. This function is used in src/mat/impls/nest/matnest.c.
> If I am not wrong, MPI_Exscan was introduced in MPI-2 but was not available in the previous standard. Apparently, the machine where we are compiling is very old and has MPI-1 only.
> 
> I guess there should be a PETSC_HAVE_MPI_EXSCAN test in configure.

   Correct, whoever used that MPI 2 function in PETSc is obligated to protect it.

   Barry


> 
> Jose
>