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      <base href="https://bugs.llvm.org/">
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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 INVALID - False positive on -Wunused-lambda-capture if capturing a reference to a global variable"
   href="https://bugs.llvm.org/show_bug.cgi?id=52099">bug 52099</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;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>INVALID
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - False positive on -Wunused-lambda-capture if capturing a reference to a global variable"
   href="https://bugs.llvm.org/show_bug.cgi?id=52099#c2">Comment # 2</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - False positive on -Wunused-lambda-capture if capturing a reference to a global variable"
   href="https://bugs.llvm.org/show_bug.cgi?id=52099">bug 52099</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>Clang is correct: this capture is not needed according to the rules of the C++
standard. See: <a href="https://godbolt.org/z/1h88Kf8dE">https://godbolt.org/z/1h88Kf8dE</a>

Because the reference is initialized by a constant expression, the use of the
reference is required by the C++ standard to (effectively) be rewritten to its
initializer, so the capture is unnecessary and will never actually be used.

In the case where the reference is initialized from a conditional expression,
the initializer is no longer a constant expression, so the rewrite doesn't
happen and a capture is required.</pre>
        </div>
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