re PR debug/79289 (DWARF info for typeof of C function with no args and no…

re PR debug/79289 (DWARF info for typeof of C function with no args and no prototype is empty pointer)

	PR debug/79289
	* dwarf2out.c (gen_type_die_with_usage): When picking a variant
	for FUNCTION_TYPE/METHOD_TYPE, use the first matching one.

From-SVN: r245039

gcc/ChangeLog

+2017-01-30  Ian Lance Taylor  <iant@google.com>
+
+	PR debug/79289
+	* dwarf2out.c (gen_type_die_with_usage): When picking a variant
+	for FUNCTION_TYPE/METHOD_TYPE, use the first matching one.
+
 2017-01-30  Martin Sebor  <msebor@redhat.com>
 
 	* doc/invoke.texi (-Wformat-truncation=1): Fix typo.

gcc/dwarf2out.c

@@ -24453,8 +24453,13 @@ gen_type_die_with_usage (tree type, dw_die_ref context_die,
 	 but try to canonicalize.  */
       tree main = TYPE_MAIN_VARIANT (type);
       for (tree t = main; t; t = TYPE_NEXT_VARIANT (t))
-	if (check_base_type (t, main) && check_lang_type (t, type))
-	  type = t;
+	{
+	  if (check_base_type (t, main) && check_lang_type (t, type))
+	    {
+	      type = t;
+	      break;
+	    }
+	}
     }
   else if (TREE_CODE (type) != VECTOR_TYPE
 	   && TREE_CODE (type) != ARRAY_TYPE)