[petsc-dev] MPI_Exscan

Jed Brown jedbrown at mcs.anl.gov
Fri Jul 29 17:36:59 CDT 2011

On Fri, Jul 29, 2011 at 09:44, Gropp, William D <wgropp at illinois.edu> wrote:

> Much better would be to use the MPI macros introduced to deal with exactly
> this problem.

Are you just referring to the MPI_VERSION/MPI_SUBVERSION macros or is there
a macro that specifically indicates the availability of MPI_Exscan()? (I
haven't seen any such macro in MPICH2 or OMPI.)

We have avoided using versions for compiler/library feature checks because
version numbers are not self-documenting and because it only takes one
implementer mistake to make the versions useless. On the other hand, all the
feature tests make configure slow, but hopefully that will be mostly
resolved once we get parallel configure working.
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