title: Unresolved external symbol __iob_func
body: <p>I am getting the </p>
  
  <pre><code>LNK2019 unresolved external symbol __iob_func referenced in function _usb_parse_configuration
  </code></pre>
  
  <p>after updating to VS 2015 and looking at the Microsoft Breaking Changes i can't find a solution. I've had more external symbol errors but most of the got solved by using the legacy library, this one stays. I have extern "C" defined in a lot of files, changing that gives only way more errors.</p>
  
  <p>Did you guys have a problem with that and how did you solve it? Any help is appreciated</p>