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    <head>
      <base href="http://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - error: fields must have a constant size: 'variable length array in structure' extension will never be supported"
   href="http://llvm.org/bugs/show_bug.cgi?id=21966">21966</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>error: fields must have a constant size: 'variable length array in structure' extension will never be supported
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.4
          </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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>sushil.agarwal@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>Ex 
#define SOME_MACRO (var1, other_param) \
    struct __attribute__((__packed__)) name_t {
         char array[var1];
         int i;
    }__tmp;
...

and caller is 
void foo(int var)
{
..
    SOME_MACRO(var, ..)

Causing 

 error: fields must have a constant size: 'variable length array in structure'
extension will never be supported</pre>
        </div>
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