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<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>
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<th>Summary</th>
<td>-Wunused-private-field false positive with __builtin_offsetof
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>myriachan@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<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>
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