From fea0dc52033e92388f1d99f1e75db3ad28bbdb86 Mon Sep 17 00:00:00 2001
From: Henry Weller <http://cfd.direct>
Date: Wed, 6 Apr 2016 12:24:47 +0100
Subject: [PATCH] src/Pstream/mpi/UPstream.C: Cast-away const-ness for
 backard-compatibility with OpenMPI versions  < 1.7.4 Resolves bug-report
 http://www.openfoam.org/mantisbt/view.php?id=2044

---
 src/Pstream/mpi/UPstream.C | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Pstream/mpi/UPstream.C b/src/Pstream/mpi/UPstream.C
index b7a5cd0c8f..1ba7dfbe33 100644
--- a/src/Pstream/mpi/UPstream.C
+++ b/src/Pstream/mpi/UPstream.C
@@ -324,7 +324,9 @@ void Foam::UPstream::allToAll
         (
             MPI_Alltoall
             (
-                sendData.begin(),
+                // NOTE: const_cast is a temporary hack for
+                // backward-compatibility with versions of OpenMPI < 1.7.4
+                const_cast<int*>(sendData.begin()),
                 sizeof(label),
                 MPI_BYTE,
                 recvData.begin(),