plugin-nvptx.c (nvptx_get_num_devices): Return zero on cuInit failure.

	* plugin/plugin-nvptx.c (nvptx_get_num_devices): Return zero
	on cuInit failure.

From-SVN: r223352

libgomp/ChangeLog

+2015-05-19  Julian Brown  <julian@codesourcery.com>
+
+	* plugin/plugin-nvptx.c (nvptx_get_num_devices): Return zero
+	on cuInit failure.
+
 2015-05-13  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/66133

libgomp/plugin/plugin-nvptx.c

@@ -782,7 +782,13 @@ nvptx_get_num_devices (void)
      until cuInit has been called.  Just call it now (but don't yet do any
      further initialization).  */
   if (instantiated_devices == 0)
-    cuInit (0);
+    {
+      r = cuInit (0);
+      /* This is not an error: e.g. we may have CUDA libraries installed but
+         no devices available.  */
+      if (r != CUDA_SUCCESS)
+        return 0;
+    }
 
   r = cuDeviceGetCount (&n);
   if (r!= CUDA_SUCCESS)