<html>
    <head>
      <base href="http://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 --- - Please implement the option -u"
   href="http://llvm.org/bugs/show_bug.cgi?id=18250">18250</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Please implement the option -u
          </td>
        </tr>

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

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

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

        <tr>
          <th>Component</th>
          <td>Driver
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>sylvestre@debian.org
          </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>The option '-u' exists in gcc and is not implemented in clang.

Here is the information about it:
-u symbol
    Pretend the symbol symbol is undefined, to force linking of library modules
to define it. You can use -u multiple times with different symbols to force
loading of additional library modules. 

In the effort to rebuild Debian, it causes more than 600 build failure (mostly
haskell packages):
<a href="http://clang.debian.net/status.php?version=3.3&key=UNDEF_REF">http://clang.debian.net/status.php?version=3.3&key=UNDEF_REF</a></pre>
        </div>
      </p>
      <hr>
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      <ul>
          <li>You are on the CC list for the bug.</li>
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