<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 --- - -Wdocumentation-unknown-command does not recognize \cond and \endcond" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24062&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=S-YCnXaBT-e-wfrN3n76YyTlvvzC8WTeD5AaMHXtQo8&s=QVDmuTClCLkL4vQrHqV52Q4XUD-8VdVjGLOGH0TdB4Q&e=">24062</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wdocumentation-unknown-command does not recognize \cond and \endcond
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </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>Keywords</th>
          <td>quality-of-implementation, wrong-debug
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>gonzalobg88@gmail.com
          </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>This was pointed out in a reply to 17437: 
<a class="bz_bug_link 
          bz_status_NEW " title="NEW --- - -Wdocumentation-unknown-command does not recognize the copydoc-tag" href="show_bug.cgi?id=17437#c2">https://llvm.org/bugs/show_bug.cgi?id=17437#c2</a>

I recently run into this while using Eric Niebler's meta and range-v3
libraries. 

The documentation for \cond and \endcond is here: 
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.stack.nl_-7Edimitri_doxygen_manual_commands.html-23cmdcond&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=S-YCnXaBT-e-wfrN3n76YyTlvvzC8WTeD5AaMHXtQo8&s=1ifo3pL1cse3nF2aUSnz3i97mNxToe-wfLqC9FHVsiE&e=">http://www.stack.nl/~dimitri/doxygen/manual/commands.html#cmdcond</a>

A start would be to recognize the commands. 

A full diagnostic would be to make sure that a \cond is always matched with an
\endcond.</pre>
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