<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 --- - -Wvla-extension warning incorrectly generated"
   href="http://llvm.org/bugs/show_bug.cgi?id=19244">19244</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wvla-extension warning incorrectly generated
          </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>C++11
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>michael@ensslin.cc
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>In the following minimal example, f() incorrectly causes a warning, while g()
and h() correctly do not.
In g++, no warning is generated.

I assume that the warning is generated because LLVM doesn't notice that this->x
is constexpr. 

mic@mic-nb $ cat test.cpp
struct A {
    static constexpr int x = 5;

    void f() {
        int a[this->x]; //warning
    }

    void g() {
        int a[x];       //no warning
    }

    void h() {
        int a[A::x];    //no warning
    }
};
mic@mic-nb $ clang++ -std=c++11 -Wvla-extension -c test.cpp
test.cpp:5:8: warning: variable length arrays are a C99 feature
[-Wvla-extension]
                int a[this->x]; //warning
                     ^
1 warning generated.</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>