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      <base href="https://bugs.llvm.org/">
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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 - After r307364, some versioned symbols do not appear in .so files"
   href="https://bugs.llvm.org/show_bug.cgi?id=33820">33820</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>After r307364, some versioned symbols do not appear in .so files
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lld
          </td>
        </tr>

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

        <tr>
          <th>Hardware</th>
          <td>All
          </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>ELF
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>dimitry@andric.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=18806" name="attach_18806" title="Minimized test case for symbol versioning problem">attachment 18806</a> <a href="attachment.cgi?id=18806&action=edit" title="Minimized test case for symbol versioning problem">[details]</a></span>
Minimized test case for symbol versioning problem

As reported on <a href="https://reviews.llvm.org/rL307364">https://reviews.llvm.org/rL307364</a>, after this change I got
errors while linking the FreeBSD base system, similar to:

ld.lld: error: undefined symbol: openat
<span class="quote">>>> referenced by dma-mbox-create.c:175 (/home/dim/src/clang500-import/contrib/dma/dma-mbox-create.c:175)
>>>               dma-mbox-create.o:(main)</span >

It turns out openat is a versioned symbol, which appears twice in libc.so.7:

$ readelf -sW /lib/libc.so.7 | grep -w openat
  3087: 000000000004e2e0   203 FUNC    WEAK   DEFAULT   11 <a href="mailto:openat@FBSD_1.1">openat@FBSD_1.1</a>
  3088: 000000000004e2e0   203 FUNC    WEAK   DEFAULT   11 openat@@FBSD_1.2

When doing the link with lld, on aarch64, the openat@@FBSD_1.2 version
disappears, for some reason.

I've attached a minimized test case in a tarball.  There is a Makefile in the
extracted directory, which links with both ld.bfd and ld.ldd, and shows the
difference in output.</pre>
        </div>
      </p>


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