diff --git a/ompi/mca/coll/base/coll_base_allgatherv.c b/ompi/mca/coll/base/coll_base_allgatherv.c
index c3ced000a0..3f09d91d6c 100644
--- a/ompi/mca/coll/base/coll_base_allgatherv.c
+++ b/ompi/mca/coll/base/coll_base_allgatherv.c
@@ -100,7 +100,7 @@ int ompi_coll_base_allgatherv_intra_bruck(const void *sbuf, int scount,
 {
     int line = -1, err = 0, rank, size, sendto, recvfrom, distance, blockcount, i;
     int *new_rcounts = NULL, *new_rdispls = NULL, *new_scounts = NULL, *new_sdispls = NULL;
-    ptrdiff_t slb, rlb, sext, rext;
+    ptrdiff_t rlb, rext;
     char *tmpsend = NULL, *tmprecv = NULL;
     struct ompi_datatype_t *new_rdtype, *new_sdtype;
 
@@ -226,7 +226,7 @@ int ompi_coll_base_allgatherv_intra_ring(const void *sbuf, int scount,
                                           mca_coll_base_module_t *module)
 {
     int line = -1, rank, size, sendto, recvfrom, i, recvdatafrom, senddatafrom, err = 0;
-    ptrdiff_t slb, rlb, sext, rext;
+    ptrdiff_t rlb, rext;
     char *tmpsend = NULL, *tmprecv = NULL;
 
     size = ompi_comm_size(comm);
@@ -355,7 +355,7 @@ ompi_coll_base_allgatherv_intra_neighborexchange(const void *sbuf, int scount,
     int line = -1, rank, size, i, even_rank, err = 0;
     int neighbor[2], offset_at_step[2], recv_data_from[2], send_data_from;
     int new_scounts[2], new_sdispls[2], new_rcounts[2], new_rdispls[2];
-    ptrdiff_t slb, rlb, sext, rext;
+    ptrdiff_t rlb, rext;
     char *tmpsend = NULL, *tmprecv = NULL;
     struct ompi_datatype_t  *new_rdtype, *new_sdtype;
 
@@ -500,7 +500,7 @@ int ompi_coll_base_allgatherv_intra_two_procs(const void *sbuf, int scount,
 {
     int line = -1, err = 0, rank, remote;
     char *tmpsend = NULL, *tmprecv = NULL;
-    ptrdiff_t sext, rext, lb;
+    ptrdiff_t rext, lb;
 
     rank = ompi_comm_rank(comm);
 
diff --git a/opal/mca/btl/openib/btl_openib_component.c b/opal/mca/btl/openib/btl_openib_component.c
index 966796f193..f8bf75cb1d 100644
--- a/opal/mca/btl/openib/btl_openib_component.c
+++ b/opal/mca/btl/openib/btl_openib_component.c
@@ -3719,7 +3719,7 @@ error:
         endpoint->endpoint_state = MCA_BTL_IB_FAILED;
 
         if(IBV_WC_SEND == wc->opcode && !BTL_OPENIB_QP_TYPE_PP(qp)) {
-            BTL_VERBOSE(("frag %p returning %d credits", frag, 1+n));
+            BTL_VERBOSE(("frag %p returning %d credits", (void*) frag, 1+n));
             OPAL_THREAD_FETCH_ADD32(&openib_btl->qps[qp].u.srq_qp.sd_credits, 1+n);
             /* new SRQ credit available. Try to progress pending frags*/
             progress_pending_frags_srq(openib_btl, qp);
diff --git a/orte/mca/rmaps/base/rmaps_base_map_job.c b/orte/mca/rmaps/base/rmaps_base_map_job.c
index 028e387629..28caf387c7 100644
--- a/orte/mca/rmaps/base/rmaps_base_map_job.c
+++ b/orte/mca/rmaps/base/rmaps_base_map_job.c
@@ -556,17 +556,17 @@ void orte_rmaps_base_display_map(orte_job_t *jdata)
                 if (NULL == (proc = (orte_proc_t*)opal_pointer_array_get_item(node->procs, j))) {
                     continue;
                 }
-                memset(tmp1, 0, 1024);
+                memset(tmp1, 0, sizeof(tmp1));
                 if (orte_get_attribute(&proc->attributes, ORTE_PROC_HWLOC_BOUND, (void**)&bd, OPAL_PTR)) {
                     if (NULL == bd) {
-                        (void)strncpy(tmp1, "UNBOUND", strlen("UNBOUND"));
+                        (void)strncpy(tmp1, "UNBOUND", sizeof(tmp1));
                     } else {
                         if (OPAL_ERR_NOT_BOUND == opal_hwloc_base_cset2mapstr(tmp1, sizeof(tmp1), node->topology->topo, bd->cpuset)) {
-                            (void)strncpy(tmp1, "UNBOUND", strlen("UNBOUND"));
+                            (void)strncpy(tmp1, "UNBOUND", sizeof(tmp1));
                         }
                     }
                 } else {
-                    (void)strncpy(tmp1, "UNBOUND", strlen("UNBOUND"));
+                    (void)strncpy(tmp1, "UNBOUND", sizeof(tmp1));
                 }
                 opal_output(orte_clean_output, "\t\t<process rank=%s app_idx=%ld local_rank=%lu node_rank=%lu binding=%s>",
                             ORTE_VPID_PRINT(proc->name.vpid),  (long)proc->app_idx,