title: Building LLVM with CMake and Visual Stuidio fails to install,
body: <p>I am currently facing an issue when building llvm + compiler-rt under windows. I am using the latest vs 2017 community and cmake to generate the solution. Everything goes smoothly.</p>
  
  <p>I then follow the instructions and everything builds. The problem I have is at install time; I get the following error:</p>
  
  <pre><code>file INSTALL cannot find
  77&gt;  "F:/WORK_IN_PROGRESS/compile/build/$(Configuration)/lib/clang/6.0.0/lib/windows/clang_rt.builtins-x86_64.lib".
  </code></pre>
  
  <p>Everything else installs fine, other libs, headers are all there, and yes I am running visual studio in admin mode just to make sure there are no issue in copying file arounds etc. Here is the full error:</p>
  
  <p>I have double checked and the same path works, the file exists I have tried to go in the correpsonding cmake install and change the slashes to backward-slashes still no luck. I can copy the lib there manually but I am not sure what else I will have to copy and where that s why I am trying to solve it properly. I am off of trunk, but looks like I a problem that has been gone for a while:</p>
  
  <pre><code>77&gt;CMake Error at projects/compiler-rt/lib/builtins/cmake_install.cmake:34 (file):
  77&gt;  file INSTALL cannot find
  77&gt;  "F:/WORK_IN_PROGRESS/compile/build/$(Configuration)/lib/clang/6.0.0/lib/windows/clang_rt.builtins-x86_64.lib".
  77&gt;Call Stack (most recent call first):
  77&gt;  projects/compiler-rt/lib/cmake_install.cmake:33 (include)
  77&gt;  projects/compiler-rt/cmake_install.cmake:33 (include)
  77&gt;  projects/cmake_install.cmake:32 (include)
  77&gt;  cmake_install.cmake:64 (include)
  77&gt;
  </code></pre>
  
  <p>Also, as a side note, it looks like the install process is trying to access a weird old redistributable of vs 2017 and I cannot install it, even after scavenging the installer it fails because there is a new one.
  Any help on the matter would be greatly appreciated</p>
  
  <p>Cheers</p>