[petsc-dev] MPI_Exscan

[Mark F. Adams]

Dumb question: How do you protect it?
Mark

On Jul 28, 2011, at 3:05 PM, Barry Smith wrote:

> 
> 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
>> 
> 
>