* gcc-interface/utils.c (def_builtin_1): Bail out on error_mark_node.

From-SVN: r258276

gcc/ada/ChangeLog

+2018-03-06  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc-interface/utils.c (def_builtin_1): Bail out on error_mark_node.
+
 2018-02-28  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* libgnat/i-cexten.ads (Float_128): New type.

gcc/ada/gcc-interface/utils.c

@@ -6443,6 +6443,9 @@ def_builtin_1 (enum built_in_function fncode,
   if (builtin_decl_explicit (fncode))
     return;
 
+  if (fntype == error_mark_node)
+    return;
+
   gcc_assert ((!both_p && !fallback_p)
 	      || !strncmp (name, "__builtin_",
 			   strlen ("__builtin_")));