<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 --- - Potential vtordisp bug"
   href="http://llvm.org/bugs/show_bug.cgi?id=19407">19407</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Potential vtordisp bug
          </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>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>LLVM Codegen
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>david.majnemer@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>consider:
extern "C" int printf(const char *, ...);
struct A {};
struct B {};
struct C : A {
  virtual void fun() {}
};
struct D : virtual B, virtual C {
  virtual void fun() {}
  D() {}
};
int main() { printf("sizeof(D): %Iu\n", sizeof(D)); }

32-bit clang/MSVC

--- different.cpp_clang 2014-04-11 15:57:50.482628043 -0700
+++ different.cpp_vs    2014-04-11 15:57:50.462627835 -0700
@@ -1 +1 @@
-sizeof(D): 16
+sizeof(D): 12</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>