<html>
    <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 --- - A &#64;&#64; version cannot be undefined" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24023&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=VBUtibqMqaH15RXfOuEflN9JSOrGjFYcyfWLfB9eVj8&s=9XOPG7a1SF663PV-B-WGB_cjKLeJznT3_iWFUhIJ11c&e=">24023</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>A @@ version cannot be undefined
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </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>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>MC
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>hfinkel@anl.gov
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Given this file:

$ cat /tmp/s.c 
int
main ()
{
__asm__(".symver main_, main@@ABIVER_1.0");
  ;
  return 0;
}

gcc/binutils have no problem:

$ gcc -o /tmp/s.o /tmp/s.c

but Clang/LLVM has a problem:

clang -o /tmp/s.o /tmp/s.c
fatal error: error in backend: A @@ version cannot be undefined</pre>
        </div>
      </p>
      <hr>
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          <li>You are on the CC list for the bug.</li>
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