title: __float128 is not supported on this target
body: <p>I am trying to install sentry server on windows via <code>cygwin</code>. While installing it , it fails with the error:</p>
  
  <pre><code>/usr/lib/gcc/x86_64-pc-cygwin/5.4.0/include/c++/type_traits:311:39: error: __float128 is not supported on this target
  struct __is_floating_point_helper&lt;__float128&gt;
                                    ^
  </code></pre>
  
  <p>Now on investigating it, I found out that it is relates to the issue of <code>clang</code> supporting the <code>'__float128'</code> on only select target, i.e Before 3.9.0 clang did not support <code>__float128</code> and prior to 3.9.0 it was defining a type alias as a workaround.</p>
  
  <p>Starting with 3.9.0 clang implemented native <code>__float128 support</code> and the alias workaround was removed. The only targets supporting __float128 at this moment are <code>linux x86_64 and i686</code> </p>
  
  <p>Hence my question, Is there any solution to make this error go away ?</p>