title: What causes linker warning "MSIL .netmodule or module compiled with /GL found; restarting link with /LTCG"?
body: <p>Some projects in my solution produce this linker warning:</p>
  
  <pre><code>MSIL .netmodule or module compiled with /GL found; restarting link with /LTCG; add /LTCG to the link command line to improve linker performance
  </code></pre>
  
  <p>I'm using Visual Studio 2013 Update 3. I haven't yet been able to identify anything particular to those projects that could cause this.</p>
  
  <p>What is it about those projects that produces this?</p>
  
  <hr>
  
  <p>I've looked at this: <a href="http://msdn.microsoft.com/en-us/library/k669k83h.aspx">http://msdn.microsoft.com/en-us/library/k669k83h.aspx</a>
  but I'm not aware we are using any CLR, managed code, /LN or /NOASSEMBLY.</p>