Build error - targeted OS version does not support use of thread local variables : <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>
