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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 - std::function isn't ABI compatible between C++03 and C++11"
   href="https://bugs.llvm.org/show_bug.cgi?id=39838">39838</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>std::function isn't ABI compatible between C++03 and C++11
          </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>Linux
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </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></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=21178" name="attach_21178" title="reproducer.sh.cpp">attachment 21178</a> <a href="attachment.cgi?id=21178&action=edit" title="reproducer.sh.cpp">[details]</a></span>
reproducer.sh.cpp

Our fallback implementation of std::function for C++03 isn't ABI compatible
with the C++11 implementation; specifically the
__base<Args>::operator()(Args...). In C++11 the virtual call operator accepts
it's parameters by rvalue reference (to avoid additional copies), but the C++03
version accepts its arguments by value.</pre>
        </div>
      </p>


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