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      <base href="https://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Legacy libc++abi configuration logic in libc++?"
   href="https://llvm.org/bugs/show_bug.cgi?id=31904">31904</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Legacy libc++abi configuration logic in libc++?
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>All
          </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>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>eric@efcs.ca
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The configuration in question is seen in exception.cpp:24 and new.cpp:20. In
these places it configures for a `cxxabi.h` which (1) doesn't define
`_LIBCPPABI_VERSION` and (2) defines a special namespace `__cxxabiapple`.

As mentioned I believe this configuration is dead. libc++abi's cxxabi.h has
been defining `_LIBCPPABI_VERSION` since 2012, and I can't find any evidence of
the `__cxxabiapple` namespace.

@Duncan do you know where this weird `cxxabi.h` header is coming from? Or if
Apple still uses it?</pre>
        </div>
      </p>
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