title: how do you install a particular version of clang and llvm from tar?
body: <p>If I want to install a particular version of llvm+clang, for instance 3.8.1</p>
  
  <p>I see files like:</p>
  
  <p><a href="http://llvm.org/releases/3.8.1/llvm-3.8.1.src.tar.xz" rel="nofollow noreferrer">http://llvm.org/releases/3.8.1/llvm-3.8.1.src.tar.xz</a></p>
  
  <p><a href="http://llvm.org/releases/3.8.1/cfe-3.8.1.src.tar.xz" rel="nofollow noreferrer">http://llvm.org/releases/3.8.1/cfe-3.8.1.src.tar.xz</a></p>
  
  <p>listed here for download: <a href="http://llvm.org/releases/download.html" rel="nofollow noreferrer">http://llvm.org/releases/download.html</a></p>
  
  <p>but how do I untar/combine these so that I can build them?</p>
  
  <p>The tar structure seems a bit odd, like it has files like this:</p>
  
  <pre><code> cfe-3.8.1.src/lib/Sema/SemaAttr.cpp
  </code></pre>
  
  <p>(cfe-3.8.1.src is its root path? where should these files end up?)</p>
  
  <p>This questions notes how to do it using svn: <a href="https://stackoverflow.com/questions/26550987/svn-how-do-i-download-a-specific-release-of-llvm-clang">svn - How do I download a specific release of llvm,clang</a></p>
  
  <p>Whereas I am trying to figure out using  .tar style files here.</p>