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    <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 --- - [Windows] __uuidof support"
   href="http://llvm.org/bugs/show_bug.cgi?id=18133">18133</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[Windows] __uuidof support
          </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>Windows XP
          </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>C++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>forderud@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=11664" name="attach_11664" title="Code to reproduce">attachment 11664</a> <a href="attachment.cgi?id=11664&action=edit" title="Code to reproduce">[details]</a></span>
Code to reproduce

It seems like there is no support for the "__uuidof" operator in clang.
This operator is heavily used in conjunction to COM on Windows.

Attempting to build a small Direct3D example code (attached) with "clang -v
test.cpp -o test.exe" yields the following error:
---
test.cpp:8:37: error: cannot yet mangle expression type CXXUuidofExpr
_COM_SMARTPTR_TYPEDEF(ID3D10Device, __uuidof(ID3D10Device));
                                    ^~~~~~~~~~~~~~~~~~~~~~
c:\Program Files (x86)\Microsoft Visual Studio
10.0\VC\INCLUDE\comdef.h:296:60:
note:
      expanded from macro '_COM_SMARTPTR_TYPEDEF'
    typedef _COM_SMARTPTR<_COM_SMARTPTR_LEVEL2<Interface, &IID> > \
                                                           ^
---</pre>
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