Merge pull request #583 from rhc54/topic/mallocwarnings

Silence malloc(0) warnings reported by Lisandro

contrib/platform/intel/bend/linux

@@ -10,7 +10,7 @@ enable_debug=yes
 enable_shared=yes
 enable_static=no
 enable_memchecker=no
-enable_ipv6=yes
+enable_ipv6=no
 enable_mpi_fortran=yes
 enable_mpi_cxx=no
 enable_mpi_cxx_seek=no

ompi/mca/coll/libnbc/coll_libnbc_ireduce_scatter_block.c

@@ -51,9 +51,9 @@ int ompi_coll_libnbc_ireduce_scatter_block(void* sendbuf, void* recvbuf, int rec
   res = MPI_Comm_rank(comm, &rank);
   if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
   res = MPI_Comm_size(comm, &p);
-  if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_size() (%i)\n", res); return res; }
+  if (MPI_SUCCESS != res || 0 == p) { printf("MPI Error in MPI_Comm_size() (%i:%i)\n", res, p); return (MPI_SUCCESS == res) ? MPI_ERR_SIZE : res; }
   res = MPI_Type_extent(datatype, &ext);
-  if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
+  if (MPI_SUCCESS != res || 0 == ext) { printf("MPI Error in MPI_Type_extent() (%i:%i)\n", res, (int)ext); return (MPI_SUCCESS == res) ? MPI_ERR_SIZE : res; }
   
   schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
   if (NULL == schedule) { printf("Error in malloc()\n"); return NBC_OOR; }

ompi/mca/coll/libnbc/nbc_internal.h

@@ -501,7 +501,7 @@ static inline int NBC_Copy(void *src, int srccount, MPI_Datatype srctype, void *
   } else {
     /* we have to pack and unpack */
     res = MPI_Pack_size(srccount, srctype, comm, &size);
-    if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Pack_size() (%i)\n", res); return res; }
+    if (MPI_SUCCESS != res || 0 == size) { printf("MPI Error in MPI_Pack_size() (%i:%i)\n", res, size); return (MPI_SUCCESS == res) ? MPI_ERR_SIZE : res; }
     packbuf = malloc(size);
     if (NULL == packbuf) { printf("Error in malloc()\n"); return res; }
     pos=0;