message: in resolution of [Wsign-compare] warning id 1
diff: @@ -23,7 +23,7 @@ const char* kProtobufUint64Typename = "::tensorflow::protobuf_uint64";
  TStringOutputStream::TStringOutputStream(tstring* target) : target_(target) {}
  bool TStringOutputStream::Next(void** data, int* size) {
  - int old_size = target_->size();
  + size_t old_size = target_->size();
  // Grow the string.
  if (old_size < target_->capacity()) {
  @@ -32,7 +32,7 @@ bool TStringOutputStream::Next(void** data, int* size) {
  target_->resize_uninitialized(target_->capacity());
  } else {
  // Size has reached capacity, try to double the size.
  - if (old_size > std::numeric_limits<int>::max() / 2) {
  + if (old_size > std::numeric_limits<size_t>::max() / 2) {
  // Can not double the size otherwise it is going to cause integer
  // overflow in the expression below: old_size * 2 ";
  return false;
  @@ -41,7 +41,7 @@ bool TStringOutputStream::Next(void** data, int* size) {
  // kMinimumSize.
  target_->resize_uninitialized(
  std::max(old_size * 2,
  - kMinimumSize + 0)); // "+ 0" works around GCC4 weirdness.
  + (size_t)kMinimumSize + 0)); // "+ 0" works around GCC4 weirdness.
  }
  *data = target_->data() + old_size;
  