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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: Layout wrong for indirectly inherited packed base"
href="http://llvm.org/bugs/show_bug.cgi?id=20315">20315</a>
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<th>Summary</th>
<td>MS ABI: Layout wrong for indirectly inherited packed base
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>consider:
extern "C" int printf(const char *, ...);
static char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct A {};
struct B : A {};
struct C {};
#pragma pack(push, 1)
struct D : B, virtual A, virtual C {
int field;
D() {
printf("field: %d\n", (int)&field - (int)buffer);
}
};
#pragma pack(pop)
struct E : D {};
struct F : A, E {};
template <typename Class> static void init_mem() {
new (buffer) Class;
}
int main() {
init_mem<F>();
}
we give:
field: 5
they give:
field: 8</pre>
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