Fix so we do not get warnings when running on system without CUDA software installed and CUDA-aware compiled in.

This commit was SVN r30032.

ompi/mca/common/cuda/common_cuda.c

@@ -295,6 +295,12 @@ int mca_common_cuda_stage_one_init(void)
     mca_common_cuda_output = opal_output_open(NULL);
     opal_output_set_verbosity(mca_common_cuda_output, mca_common_cuda_verbose);
 
+    /* First check if the support is enabled.  In the case that the user has
+     * turned it off, we do not need to continue with any CUDA specific
+     * initialization.  Do this after MCA parameter registration. */
+    if (!ompi_mpi_cuda_support)
+        return;
+
     if (0 != (retval = opal_lt_dlinit())) {
         if (OPAL_ERR_NOT_SUPPORTED == retval) {
             opal_show_help("help-mpi-common-cuda.txt", "dlopen disabled", true);

ompi/runtime/ompi_mpi_params.c

@@ -326,7 +326,7 @@ int ompi_mpi_register_params(void)
                                  "Whether CUDA GPU buffer support is enabled or not",
                                  MCA_BASE_VAR_TYPE_BOOL, NULL, 0, 0,
                                  OPAL_INFO_LVL_4,
-                                 MCA_BASE_VAR_SCOPE_LOCAL,
+                                 MCA_BASE_VAR_SCOPE_READONLY,
                                  &ompi_mpi_cuda_support);
     if (ompi_mpi_cuda_support && !ompi_mpi_built_with_cuda_support) {
         opal_show_help("help-mpi-runtime.txt", "no cuda support",