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 >> > >
