title: LLVM won't build libLLVM-3.4.so
body: <p>I'm trying to build llvm 3.4.2 on CentOS 7 with GCC 4.8.5. I can successfully build all of the libs, except libLLVM-3.4.so doesn't want to build - everything else gets created except that one. What's worse is I've managed it previously in the past, but can't do it again now.</p>
  
  <p>I've tried both with CMake and autotools, with the same result. Is there an option I'm missing? Or some error in configuration possibly?</p>