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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: Alignment of field following vbptr or vfptr is ignored."
href="http://llvm.org/bugs/show_bug.cgi?id=18694">18694</a>
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<th>Summary</th>
<td>MS ABI: Alignment of field following vbptr or vfptr is ignored.
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>consider:
extern "C" int printf(const char *, ...);
#pragma pack(push, 1)
struct A {
virtual void fun() {}
__declspec(align(8)) int Field;
A() {
printf("F: %u\n", (char *)&Field - (char *)this);
}
};
#pragma pack(pop)
int main() {
A x;
printf("sizeof(A): %u\n", sizeof(A));
}
we get:
F: 4
sizeof(A): 8
msvc gets:
F: 8
sizeof(A): 16
NOTE: the problem also occurs if the vfptr is replaced with a vbptr.</pre>
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