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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: Assertion when laying out array of zero sized objects"
href="http://llvm.org/bugs/show_bug.cgi?id=18458">18458</a>
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<th>Summary</th>
<td>MS ABI: Assertion when laying out array of zero sized objects
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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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>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Consider:
struct A {};
struct SmallVector {
A InlineElts[3];
};
SmallVector D;
Gives the assertion:
Assertion failed: NextFieldOffset <= RecordSize && "Size mismatch!", file
..\tools\clang\lib\CodeGen\CGRecordLayoutBuilder.cpp, line 899
Clang thinks that the A array occupies no space, but MSVC thinks each element
is one byte, giving a sizeof of 3.
*** Dumping AST Record Layout
0 | struct SmallVector
0 | struct A [3] InlineElts
| [sizeof=1, align=1
| nvsize=1, nvalign=1]</pre>
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