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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Definition __ZTSPKDu in itanium-base.exp is used for -export_symbol but is really undefined"
   href="https://bugs.llvm.org/show_bug.cgi?id=43749">43749</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Definition __ZTSPKDu in itanium-base.exp is used for -export_symbol but is really undefined
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++abi
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>9.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>MacOS X
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>nat-llvmbugs@mulle-kybernetik.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>This happens when building on MacOS 10.13. I suppose some parts of the code
gets #ifdef-ed out, but the symbollist isn't, that is passed to the linker.
This list is in `lib/itanium-base.exp` and used as input for
`-exported_symbols_list`. 

Now Apple's linker decided in its wisdom, that missing actual symbols are an
error (and not a warning, what would be sane) and the build aborts.

All affected symbols are of the form _Z.*du. If I remove them before building
things work out OK.</pre>
        </div>
      </p>


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