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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: Layout of derived class with empty base is wrong"
href="http://llvm.org/bugs/show_bug.cgi?id=19181">19181</a>
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<th>Summary</th>
<td>MS ABI: Layout of derived class with empty base is wrong
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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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>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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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 : public A {
int Fiel1;
B() {
printf("Fiel1 : %lu\n", ((char *)&Fiel1 - (char *)&buffer));
}
};
struct C {
int Fiel2;
};
struct D : public A, public C {
int Fiel3;
};
struct E : public D, public B {
int Fiel4;
};
int main() { new (buffer) E; }
MSVC gives us:
Fiel1 : 8
clang gives us:
Fiel1 : 12</pre>
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