<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 --- - -Wunused-private-field false positive with __builtin_offsetof"
   href="http://llvm.org/bugs/show_bug.cgi?id=20901">20901</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wunused-private-field false positive with __builtin_offsetof
          </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>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++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>myriachan@gmail.com
          </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>The following C++ spuriously generates the "-Wunused-private-field" warning:

#include <cstdio>

class Meow
{
    int x;
    friend int main();
};

int main()
{
    std::printf("%zu\n", __builtin_offsetof(Meow, x));
    return 0;
}

prog.cc:5:9: warning: private field 'x' is not used [-Wunused-private-field]
    int x;
        ^

clang version 3.6.0 (trunk 217508) Target: x86_64-unknown-linux-gnu Thread
model: posix</pre>
        </div>
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