<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 --- - Assertion failure on dereferencing member pointer using virtual inheritance with an incomplete class type"
   href="http://llvm.org/bugs/show_bug.cgi?id=18583">18583</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Assertion failure on dereferencing member pointer using virtual inheritance with an incomplete class type
          </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>Windows NT
          </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>rnk@google.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>david.majnemer@gmail.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>$ cat t.cpp
struct __virtual_inheritance A;
int foo(A *a, int A::*mp) {
  return a->*mp;
}

$ clang-cl -c t.cpp
Assertion failed: DefinitionData && "queried property of class with no
definition", file ..\tools\clang\include\clang/AST/DeclCXX.h, line 562
clang-cl.exe: error: clang frontend command failed with exit code 3 (use -v to
see invocation)

Amusingly, this also kills MSVC:
$ cl -c t.cpp -nologo
t.cpp
t.cpp(4) : fatal error C1001: An internal error has occurred in the compiler.

We should require a complete class type in MS ABI mode when dereferencing a
member pointer.</pre>
        </div>
      </p>
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