title: What is *.o file?
body: <p>I'm compiling own project. And it halted by this error:</p>
  
  <blockquote>
    <p>LINK||fatal error LNK1181: cannot open
    input file
    'obj\win\release\src\lua\bindings.o'|</p>
  </blockquote>
  
  <p>Compiling using Code::Blocks with VS 2005/2008 compiler under win7.
  There are also lot of another empty directories where *.o files are missing.</p>
  
  <p>What do they do?</p>