trans.c (gnat_to_gnu): Initialize sync to false to avoid UB.

	* gcc-interface/trans.c (gnat_to_gnu): Initialize sync to false to
	avoid UB.

From-SVN: r249604

gcc/ada/ChangeLog

+2017-06-23  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc-interface/trans.c (gnat_to_gnu): Initialize sync to false to
+	avoid UB.
+
 2017-06-21  Pierre-Marie de Rodat  <derodat@adacore.com>
 
 	* gcc-interface/ada-tree.h (DECL_FUNCTION_IS_DEF): Update copyright

gcc/ada/gcc-interface/trans.c

@@ -5883,7 +5883,7 @@ gnat_to_gnu (Node_Id gnat_node)
   tree gnu_result_type = void_type_node;
   tree gnu_expr, gnu_lhs, gnu_rhs;
   Node_Id gnat_temp;
-  bool sync;
+  bool sync = false;
 
   /* Save node number for error message and set location information.  */
   error_gnat_node = gnat_node;