Don't complain about unsupported protocols. Needs to be made better,

but this will quit the whining from platforms where the kernel doesn't
have IPv6 support.

This commit was SVN r14676.

ompi/mca/btl/tcp/btl_tcp_component.c

@@ -485,9 +485,11 @@ static int mca_btl_tcp_component_create_listen(uint16_t af_family)
     /* create a listen socket for incoming connections */
     sd = socket(af_family, SOCK_STREAM, 0);
     if(sd < 0) {
-        BTL_ERROR(("socket() failed: %s (%d)",
-                   strerror(opal_socket_errno), opal_socket_errno));
-        return OMPI_ERROR;
+        if (EAFNOSUPPORT != opal_socket_errno) {
+            BTL_ERROR(("socket() failed: %s (%d)",
+                       strerror(opal_socket_errno), opal_socket_errno));
+        }
+        return OMPI_ERR_IN_ERRNO;
     }
 
     /* we now have a socket. Assign it to the real mca_btl_tcp_component */
@@ -717,6 +719,7 @@ mca_btl_base_module_t** mca_btl_tcp_component_init(int *num_btl_modules,
                                                    bool enable_progress_threads,
                                                    bool enable_mpi_threads)
 {
+    int ret;
     mca_btl_base_module_t **btls;
     *num_btl_modules = 0;
 
@@ -757,9 +760,11 @@ mca_btl_base_module_t** mca_btl_tcp_component_init(int *num_btl_modules,
         return 0;
     }
 #if OPAL_WANT_IPV6
-    if(mca_btl_tcp_component_create_listen(AF_INET6) != OMPI_SUCCESS) {
-        opal_output (0, "mca_btl_tcp_component: IPv6 listening socket failed\n");
-        return 0;
+    if((ret = mca_btl_tcp_component_create_listen(AF_INET6)) != OMPI_SUCCESS) {
+        if (!(OMPI_ERR_IN_ERRNO == ret && EAFNOSUPPORT == opal_socket_errno)) {
+            opal_output (0, "mca_btl_tcp_component: IPv6 listening socket failed\n");
+            return 0;
+        }
     }
 #endif