title: MinGW-w64's gcc and Address Sanitizer
body: <p>Installing MinGW-w64 5.1 I find <code>-fsanitize=address</code> is available.  It compiles fine, and when it starts linking I get thousands of:</p>
  
  <pre><code>undefined reference to '__asan_report_load1'
  undefined reference to '__asan_report_load4'
  </code></pre>
  
  <p>I googled and found libasan referenced various places, but also comments that when you include <code>-fsanitize=address</code> it automatically includes that library for linking. I searched the MinGW-w64 5.1 install dirctory for "asan" and it was not found anywhere.</p>
  
  <p>What do I need to add on to use address sanitizing features in MinGW-w64?  Thank you.</p>