[PTX] stabs debug

[PTX] stabs debug

[Nathan Sidwell]

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The new dg test for stabs support quite reasonably expects an error if there is 
no support.  PTX was silently ignoring debug info requests.   stabs is never 
gonna work though,  so  be noisy for that.

also noticed another place I should be calling nvptx_assemble_decl_end

nathan

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2015-12-18  Nathan Sidwell  <nathan@acm.org>

	* config/nvptx/nvptx.c (nvptx_option_override): Emit sorry for
	stabs debug.
	(nvptx_assemble_undefined_decl): Use nvptx_assemble_decl_end.

Index: config/nvptx/nvptx.c
===================================================================
--- config/nvptx/nvptx.c	(revision 231818)
+++ config/nvptx/nvptx.c	(working copy)
@@ -159,6 +159,13 @@ nvptx_option_override (void)
   flag_toplevel_reorder = 1;
   /* Assumes that it will see only hard registers.  */
   flag_var_tracking = 0;
+
+  if (write_symbols == DBX_DEBUG)
+    /* The stabs testcases want to know stabs isn't supported.  */
+    sorry ("stabs debug format not supported");
+
+  /* Actually we don't have any debug format, but don't be
+     unneccesarily noisy.  */
   write_symbols = NO_DEBUG;
   debug_info_level = DINFO_LEVEL_NONE;
 
@@ -1751,7 +1758,7 @@ nvptx_assemble_undefined_decl (FILE *fil
   nvptx_assemble_decl_begin (file, name, section_for_decl (decl),
 			     TREE_TYPE (decl), size ? tree_to_shwi (size) : 0,
 			     DECL_ALIGN (decl));
-  fprintf (file, ";\n");
+  nvptx_assemble_decl_end ();
 }
 
 /* Output a pattern for a move instruction.  */