PR c++/70344 - ICE with recursive constexpr

	* constexpr.c (cxx_eval_call_expression): Check for
	fun == current_function_decl again.

From-SVN: r236625

gcc/cp/ChangeLog

 2016-05-23  Jason Merrill  <jason@redhat.com>
 
+	PR c++/70344
+	* constexpr.c (cxx_eval_call_expression): Check for
+	fun == current_function_decl again.
+
 	PR c++/70584
 	* cp-gimplify.c (cp_fold) [INDIRECT_REF]: Call
 	maybe_undo_parenthesized_ref.

gcc/cp/constexpr.c

@@ -1371,11 +1371,17 @@ cxx_eval_call_expression (const constexpr_ctx *ctx, tree t,
   else
     {
       new_call.fundef = retrieve_constexpr_fundef (fun);
-      if (new_call.fundef == NULL || new_call.fundef->body == NULL)
+      if (new_call.fundef == NULL || new_call.fundef->body == NULL
+	  || fun == current_function_decl)
         {
 	  if (!ctx->quiet)
 	    {
-	      if (DECL_INITIAL (fun) == error_mark_node)
+	      /* We need to check for current_function_decl here in case we're
+		 being called during cp_fold_function, because at that point
+		 DECL_INITIAL is set properly and we have a fundef but we
+		 haven't lowered invisirefs yet (c++/70344).  */
+	      if (DECL_INITIAL (fun) == error_mark_node
+		  || fun == current_function_decl)
 		error_at (loc, "%qD called in a constant expression before its "
 			  "definition is complete", fun);
 	      else if (DECL_INITIAL (fun))

gcc/testsuite/g++.dg/cpp0x/constexpr-recursion2.C

 // PR c++/70344
 // { dg-do compile { target c++11 } }
+// { dg-options -O }
 
 struct Z
 {