title: Use of undeclared identifier 'NSBundle'
body: <p>This is how my file.mm looks like:</p>
  
  <pre><code>const char *readFromFileMac(const char *fileName) {
      fileName =[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: @(fileName)].UTF8String;
      return fileName;
  }
  </code></pre>
  
  <p>Xcode gives me the error <code>Use of undeclared identifier 'NSBundle'</code>. Do I need to include some framework or header file to be able to use the <code>NSBundle</code> name?</p>
  
  <p>The only thing I have done is to copy my project to an other directory. After the copy I got this error, its was working before. I am using Xcode 8.2</p>