libgomp nvptx plugin: Debugging output for cuInit failure

[Thomas Schwinge <thomas@codesourcery.com>]

Hi!

OK for trunk?

commit 7b2f06b7d2fd23b20d81fda8be6ec7453e8b3fe3
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Thu Dec 22 08:30:04 2016 +0100

    libgomp nvptx plugin: Debugging output for cuInit failure
    
            libgomp/
            * plugin/plugin-nvptx.c (nvptx_get_num_devices): Debugging output
            for cuInit failure.
---
 libgomp/plugin/plugin-nvptx.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git libgomp/plugin/plugin-nvptx.c libgomp/plugin/plugin-nvptx.c
index 3ef48dd..0e1b3e2 100644
--- libgomp/plugin/plugin-nvptx.c
+++ libgomp/plugin/plugin-nvptx.c
@@ -838,7 +838,11 @@ nvptx_get_num_devices (void)
   /* PR libgomp/65099: Currently, we only support offloading in 64-bit
      configurations.  */
   if (sizeof (void *) != 8)
-    return 0;
+    {
+      GOMP_PLUGIN_debug (0, "Disabling nvptx offloading;"
+			 " only 64-bit configurations are supported\n");
+      return 0;
+    }
 
   /* This function will be called before the plugin has been initialized in
      order to enumerate available devices, but CUDA API routines can't be used
@@ -852,7 +856,11 @@ nvptx_get_num_devices (void)
       /* This is not an error: e.g. we may have CUDA libraries installed but
          no devices available.  */
       if (r != CUDA_SUCCESS)
-        return 0;
+	{
+	  GOMP_PLUGIN_debug (0, "Disabling nvptx offloading; cuInit: %s\n",
+			     cuda_error (r));
+	  return 0;
+	}
     }
 
   CUDA_CALL_ERET (-1, cuDeviceGetCount, &n);


Grüße
 Thomas