<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 --- - Precompiler Error "##""
   href="http://llvm.org/bugs/show_bug.cgi?id=17625">17625</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Precompiler Error "##"
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>other
          </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>LLVM Codegen
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>Martin.llvm.Maurer@clibb.de
          </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>OS: Windows Vista

File test.c

#include <stdio.h>

#define TESTDEFINE1(a) printf("%s", a) 
#define TESTDEFINE2(a,b) printf("%s", a ## b) 

int main()
{
  TESTDEFINE1("Hello");
  TESTDEFINE2("Hello", "World");
}

Compile via:
clang -c test.c

Version:
clang version 3.4 (trunk)
Target: i686-pc-win32
Thread model: posix</pre>
        </div>
      </p>
      <hr>
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      <ul>
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