pml/ob1: use c99 flexible array members instead of size 1 arrays

This commit updates several ob1 structures to take advantage of C99's
flexible array member.

Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>

ompi/mca/pml/ob1/pml_ob1.c

@@ -138,7 +138,7 @@ int mca_pml_ob1_enable(bool enable)
     OBJ_CONSTRUCT(&mca_pml_ob1.send_ranges, opal_free_list_t);
     opal_free_list_init ( &mca_pml_ob1.send_ranges,
                           sizeof(mca_pml_ob1_send_range_t) +
-                          (mca_pml_ob1.max_send_per_range - 1) * sizeof(mca_pml_ob1_com_btl_t),
+                          sizeof(mca_pml_ob1_com_btl_t[mca_pml_ob1.max_send_per_range]),
                           opal_cache_line_size,
                           OBJ_CLASS(mca_pml_ob1_send_range_t),
                           0,opal_cache_line_size,
@@ -163,8 +163,7 @@ int mca_pml_ob1_enable(bool enable)
      */
     opal_free_list_init ( &mca_pml_base_send_requests,
                           sizeof(mca_pml_ob1_send_request_t) +
-                          (mca_pml_ob1.max_rdma_per_request - 1) *
+                          sizeof(mca_pml_ob1_com_btl_t[mca_pml_ob1.max_rdma_per_request]),
-                          sizeof(mca_pml_ob1_com_btl_t),
                           opal_cache_line_size,
                           OBJ_CLASS(mca_pml_ob1_send_request_t),
                           0,opal_cache_line_size,
@@ -175,8 +174,7 @@ int mca_pml_ob1_enable(bool enable)
 
     opal_free_list_init ( &mca_pml_base_recv_requests,
                           sizeof(mca_pml_ob1_recv_request_t) +
-                          (mca_pml_ob1.max_rdma_per_request - 1) *
+                          sizeof(mca_pml_ob1_com_btl_t[mca_pml_ob1.max_rdma_per_request]),
-                          sizeof(mca_pml_ob1_com_btl_t),
                           opal_cache_line_size,
                           OBJ_CLASS(mca_pml_ob1_recv_request_t),
                           0,opal_cache_line_size,

ompi/mca/pml/ob1/pml_ob1_recvreq.h

@@ -55,7 +55,8 @@ struct mca_pml_ob1_recv_request_t {
     opal_mutex_t lock;
     mca_bml_base_btl_t *rdma_bml;
     mca_btl_base_registration_handle_t *local_handle;
-    mca_pml_ob1_com_btl_t req_rdma[1];
+    /** The size of this array is set from mca_pml_ob1.max_rdma_per_request */
+    mca_pml_ob1_com_btl_t req_rdma[];
 };
 typedef struct mca_pml_ob1_recv_request_t mca_pml_ob1_recv_request_t;
 

ompi/mca/pml/ob1/pml_ob1_sendreq.h

@@ -55,7 +55,8 @@ struct mca_pml_ob1_send_request_t {
     opal_mutex_t req_send_range_lock; 
     opal_list_t req_send_ranges;
     mca_pml_ob1_rdma_frag_t *rdma_frag;
-    mca_pml_ob1_com_btl_t req_rdma[1]; 
+    /** The size of this array is set from mca_pml_ob1.max_rdma_per_request */
+    mca_pml_ob1_com_btl_t req_rdma[];
 };
 typedef struct mca_pml_ob1_send_request_t mca_pml_ob1_send_request_t;
 
@@ -67,7 +68,8 @@ struct mca_pml_ob1_send_range_t {
     uint64_t range_send_length;
     int range_btl_idx;
     int range_btl_cnt;
-    mca_pml_ob1_com_btl_t range_btls[1];
+    /** The size of this array is set from mca_pml_ob1.max_send_per_range */
+    mca_pml_ob1_com_btl_t range_btls[];
 };
 typedef struct mca_pml_ob1_send_range_t mca_pml_ob1_send_range_t;
 OBJ_CLASS_DECLARATION(mca_pml_ob1_send_range_t);