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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: Insufficient VFTable entries generated by clang"
href="http://llvm.org/bugs/show_bug.cgi?id=20479">20479</a>
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<th>Summary</th>
<td>MS ABI: Insufficient VFTable entries generated by clang
</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>
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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
</td>
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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>
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<p>
<div>
<pre>consider:
struct A {
virtual A *f() { return this; };
};
struct B : virtual A {
virtual B *f() { return this; };
B() {}
};
struct C : virtual A, B {};
C c;
clang has:
const C::`vftable'[0]: [thunk]:public: virtual struct A * __thiscall
B::f`vtordisp{4294967292,0}' (void)
MSVC has:
const C::`vftable'[0]: [thunk]:public: virtual struct B * __thiscall
B::f`vtordisp{4294967292,0}' (void)
const C::`vftable'[4]: public: virtual struct B * __thiscall B::f(void)
This bug can effect builds involving RTTI in interesting ways, this seems
pretty serious.</pre>
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