re PR debug/46704 (Ada compiler fails to build itself)

	PR debug/46704
	* dwarf2out.c (dwarf2out_finish): Output the debug_aranges section
	only when it is not empty.

From-SVN: r168557

gcc/ChangeLog

-2011-01-06  Changpeng Fang <changpeng.fang@amd.com>
+2011-01-06  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR debug/46704
+	* dwarf2out.c (dwarf2out_finish): Output the debug_aranges section
+	only when it is not empty.
+
+2011-01-06  Changpeng Fang  <changpeng.fang@amd.com>
 
 	Bobcat (btver1) Enablement
 	* config.gcc (i[34567]86-*-linux* | ...): Add btver1.

gcc/dwarf2out.c

@@ -23324,7 +23324,7 @@ dwarf2out_finish (const char *filename)
 
   /* Output the address range information.  We only put functions in the arange
      table, so don't write it out if we don't have any.  */
-  if (fde_table_in_use)
+  if (arange_table_in_use)
     {
       switch_to_section (debug_aranges_section);
       output_aranges ();