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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - Assertion failure on packed derived class" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24020&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=5hUCzXzSRcg-K8BBTEfuzvM1UtAuABoPG4jO2C-Ndlg&s=czU1YrCn2SIlP81w3d0GGEh2juCc41VJF7wUtHwjmRw&e=">24020</a>
</td>
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<th>Summary</th>
<td>Assertion failure on packed derived class
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</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>
</tr>
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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>sunil_srivastava@playstation.sony.com
</td>
</tr>
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<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>Following example gives Assertion failure
---------------------------------------
struct Base
{
char one;
short two;
};
struct BasePacked {
char one;
short two;
} __attribute__((packed));
struct DerivedPacked : public BasePacked { int three; };
int FuncForDerivedPacked(DerivedPacked d)
{
return d.three;
}
---------------------------------------------------
clang version 3.7.0 (trunk 241287)
Target: x86_64-unknown-linux-gnu
$clang++ -cc1 -emit-obj -triple x86_64-unknown-linux-gnu ul.cpp
clang-3.7: /llvm/tools/clang/lib/CodeGen/TargetInfo.cpp:1821: static
{anonymous}::X86_64ABIInfo::Class
{anonymous}::X86_64ABIInfo::merge({anonymous}::X86_64ABIInfo::Class,
{anonymous}::X86_64ABIInfo::Class): Assertion `(Accum != Memory && Accum !=
ComplexX87) && "Invalid accumulated classification during merge."' failed</pre>
</div>
</p>
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