re PR debug/71855 (duplicate unspecified_parameters DIE in DWARF for functions…

re PR debug/71855 (duplicate unspecified_parameters DIE in DWARF for functions with variable arguments)

	PR debug/71855
	* dwarf2out.c (gen_subprogram_die): Only call
	gen_unspecified_parameters_die while dumping early dwarf.

From-SVN: r238488

gcc/ChangeLog

+2016-07-19  Aldy Hernandez  <aldyh@redhat.com>
+
+	PR debug/71855
+	* dwarf2out.c (gen_subprogram_die): Only call
+	gen_unspecified_parameters_die while dumping early dwarf.
+
 2016-07-19  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/71874

gcc/dwarf2out.c

@@ -20726,14 +20726,17 @@ gen_subprogram_die (tree decl, dw_die_ref context_die)
 	 void_type_node 2) an unprototyped function declaration (not a
 	 definition).  This just means that we have no info about the
 	 parameters at all.  */
-      if (prototype_p (TREE_TYPE (decl)))
+      if (early_dwarf)
 	{
-	  /* This is the prototyped case, check for....  */
-	  if (stdarg_p (TREE_TYPE (decl)))
+	  if (prototype_p (TREE_TYPE (decl)))
+	    {
+	      /* This is the prototyped case, check for....  */
+	      if (stdarg_p (TREE_TYPE (decl)))
+		gen_unspecified_parameters_die (decl, subr_die);
+	    }
+	  else if (DECL_INITIAL (decl) == NULL_TREE)
 	    gen_unspecified_parameters_die (decl, subr_die);
 	}
-      else if (DECL_INITIAL (decl) == NULL_TREE)
-	gen_unspecified_parameters_die (decl, subr_die);
     }
 
   if (subr_die != old_die)

gcc/testsuite/gcc.dg/debug/dwarf2/pr71855.c

+/* { dg-do compile } */
+/* { dg-options "-O0 -g -dA" } */
+
+// Test that there is only one DW_TAG_unspecified_parameters DIE.
+
+void
+foo (const char *format, ...)
+{
+}
+
+// { dg-final { scan-assembler-times "DIE.*DW_TAG_unspecified_parameters" 1 } }