<html>
    <head>
      <base href="https://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 --- - volatile members cause PODs to be a non-literal type"
   href="https://llvm.org/bugs/show_bug.cgi?id=26043">26043</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>volatile members cause PODs to be a non-literal type
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>Macintosh
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>MacOS X
          </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++11
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>joseph.noir@live.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Here is a minimal example compiled with Apple LLVM version 7.0.2
(clang-700.1.81) on OS X 10.11.

extern "C" {
typedef struct foo {
  volatile int a;
} foo;
typedef struct bar {
  foo f;
} bar;
} // extern "C"


class baz {
public:
  constexpr baz() : bar_({0}) {}
  bar bar_;
};

int main() {
  // nop
}

>From my understanding of the standard this should be work I get the following
error:

main.cpp:14:13: error: constexpr constructor never produces a constant
expression [-Winvalid-constexpr]
  constexpr baz() : bar_({0}) {}
            ^
main.cpp:14:21: note: non-literal type 'bar' cannot be used in a constant
expression
  constexpr baz() : bar_({0}) {}
                    ^
1 error generated.</pre>
        </div>
      </p>
      <hr>
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      <ul>
          <li>You are on the CC list for the bug.</li>
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