title: Build error - targeted OS version does not support use of thread local variables
body: <p>What does the below error means? I've never seen this before.</p>
  
  <blockquote>
    <p>d: targeted OS version does not support use of thread local variables
    in __ZN12base_logging10LogMessage5FlushEv for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see
    invocation)</p>
  </blockquote>
  
  <p>I'm using cocoapod for google cast sdk and building in Xcode 10 beta and xcode 9.4.</p>