PR c++/84938 - ICE with division by ~-1.

	* call.c (set_up_extended_ref_temp): Call cp_fully_fold.

From-SVN: r259108

gcc/cp/ChangeLog

 2018-04-04  Jason Merrill  <jason@redhat.com>
 
+	PR c++/84938 - ICE with division by ~-1.
+	* call.c (set_up_extended_ref_temp): Call cp_fully_fold.
+
 	PR c++/84936 - ICE with unexpanded pack in mem-initializer.
 	* parser.c (cp_parser_mem_initializer_list): Call
 	check_for_bare_parameter_packs.

gcc/cp/call.c

@@ -10869,6 +10869,8 @@ set_up_extended_ref_temp (tree decl, tree expr, vec<tree, va_gc> **cleanups,
   /* If the initializer is constant, put it in DECL_INITIAL so we get
      static initialization and use in constant expressions.  */
   init = maybe_constant_init (expr);
+  /* As in store_init_value.  */
+  init = cp_fully_fold (init);
   if (TREE_CONSTANT (init))
     {
       if (literal_type_p (type) && CP_TYPE_CONST_NON_VOLATILE_P (type))

gcc/testsuite/g++.dg/expr/div-by-zero1.C

+// PR c++/84938
+
+const int &a = 1 / ~-1;		// { dg-warning "division by zero" }