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    <body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - __cpp_threadsafe_static_init is not defined"
   href="https://bugs.llvm.org/show_bug.cgi?id=47012">bug 47012</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>FIXED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
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        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - __cpp_threadsafe_static_init is not defined"
   href="https://bugs.llvm.org/show_bug.cgi?id=47012#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - __cpp_threadsafe_static_init is not defined"
   href="https://bugs.llvm.org/show_bug.cgi?id=47012">bug 47012</a>
              from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
        <pre>Apple confusingly has their own version numbering system for "Apple clang"
that's unrelated to upstream Clang versions. Per

<a href="https://en.wikipedia.org/wiki/Xcode#Xcode_7.0_-_11.x_(since_Free_On-Device_Development">https://en.wikipedia.org/wiki/Xcode#Xcode_7.0_-_11.x_(since_Free_On-Device_Development</a>)

your "Apple LLVM version 9.0.0 (clang-900.0.39.2)" corresponds to Clang 4
(actually, somewhere between Clang 3.9 and Clang 4). Support for this feature
test macro was added in Clang 7
(<a href="https://github.com/llvm/llvm-project/commit/20eb9baa6d530bf421360b3d8afb87a09c0753e3">https://github.com/llvm/llvm-project/commit/20eb9baa6d530bf421360b3d8afb87a09c0753e3</a>).

Marking this FIXED on the basis that we added support for this years ago. It
looks like the Xcode 11 tools should have a Clang that's new enough to provide
this feature test macro.</pre>
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