title: clang llvm very long compliation time on cygwin
body: <p>Hi i have been compiling llvm and clang on my cygwin env using CC=gcc-4 and CXX=g++-4 flags as gcc 3.4.x doesnt seems to compile llvm clang at all. But my question is about the age long compilation time. I have been compiling this from 8pm in the evening and right now its 1:35 am. Also the size of my build directory has gone above 8 gigabytes. And still i see </p>
  
  <pre><code>llvm[5]: Linking Debug+Asserts executable clang-format
  </code></pre>
  
  <p>Is this normal? Can i somehow make this faster?</p>