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    <head>
      <base href="https://llvm.org/bugs/" />
    </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 --- - requested re-export symbol std::set_unexpected(void (*)()) is not from a dylib, but from .../exception.cpp.o"
   href="https://llvm.org/bugs/show_bug.cgi?id=25666">25666</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>requested re-export symbol std::set_unexpected(void (*)()) is not from a dylib, but from .../exception.cpp.o
          </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>jeremyhu@apple.com
          </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>Created <span class=""><a href="attachment.cgi?id=15360" name="attach_15360" title="build log (compressed)">attachment 15360</a> <a href="attachment.cgi?id=15360&action=edit" title="build log (compressed)">[details]</a></span>
build log (compressed)

Building recent master (r253905) on Lion and Mountain Lion through MacPorts
using my in-progress changes from autoconf to cmake, I am running into the
following error when linking libc++:

ld: requested re-export symbol std::set_unexpected(void (*)()) is not from a
dylib, but from CMakeFiles/cxx.dir/__/src/exception.cpp.o

We don't actually intend to *ship* this libc++.dylib.  It's just being built
because of #25665.

This does not happen on El Capitan.
I have not yet tested on Mavericks or Yosemite.</pre>
        </div>
      </p>
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