Added config macro UAVCAN_TOSTRING

libuavcan/src/transport/uc_outgoing_transfer_registry.cpp

@@ -2,7 +2,6 @@
  * Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
  */
 
-#include <cstdio>
 #include <uavcan/transport/outgoing_transfer_registry.hpp>
 
 namespace uavcan
@@ -10,6 +9,7 @@ namespace uavcan
 /*
  * OutgoingTransferRegistryKey
  */
+#if UAVCAN_TOSTRING
 std::string OutgoingTransferRegistryKey::toString() const
 {
     using namespace std;
@@ -18,5 +18,6 @@ std::string OutgoingTransferRegistryKey::toString() const
                    int(data_type_id_.get()), int(transfer_type_), int(destination_node_id_.get()));
     return std::string(buf);
 }
+#endif
 
 }