// Copyright 2021 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

namespace {

int volatile* unoptimizable;

void DoTheThing(int value, void (*callback)(int)) {
  callback(value ^ *unoptimizable);
}

int thing_result;

void Callback(int result) { thing_result = result; }

}  // namespace

int main() {
  DoTheThing(3, Callback);
  return thing_result;
}