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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: Layout of class hierarchy with overridden methods and virtual inheritance is wrong"
href="http://llvm.org/bugs/show_bug.cgi?id=19399">19399</a>
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<th>Summary</th>
<td>MS ABI: Layout of class hierarchy with overridden methods and virtual inheritance 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>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>
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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 *, ...);
struct A {
virtual void fun() {}
};
struct B: public A {};
struct C: public virtual A {
virtual void fun() {}
C() {}
};
struct D: public virtual C, public virtual B {};
int main() {
printf("sizeof(D): %Iu\n", sizeof(D));
}
32-bit:
clang gives D size 24, msvc gives it size 20
64-bit:
clang gives D size 48, msvc gives it size 40</pre>
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