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    <head>
      <base href="https://bugs.llvm.org/">
    </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 - constexpr initialization with reinterpret_cast"
   href="https://bugs.llvm.org/show_bug.cgi?id=35327">35327</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>constexpr initialization with reinterpret_cast
          </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 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>C++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ivan.donchevskii@qt.io
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>By standard it should not be possible but msvc (at least 2015 and 2017)
compiles fine with that. clang-cl fails trying to compile the same code.

Can be noticed in offsetof calls or similar declarations.

Example:

#define my_offsetof(s,m) ((int)&reinterpret_cast<char const
volatile&>((((s*)0)->m)))
struct Foo { int Bar;};
static constexpr int offset= my_offsetof(Foo, Bar);

This code compiles fine with cl but fails with clang-cl</pre>
        </div>
      </p>


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