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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [-cxx-abi microsoft] Should issue a compiler error for class hierarchies we can't lay out vftables for"
href="http://llvm.org/bugs/show_bug.cgi?id=16759">16759</a>
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<th>Summary</th>
<td>[-cxx-abi microsoft] Should issue a compiler error for class hierarchies we can't lay out vftables for
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>timurrrr@google.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Example:
------------------------
struct C0 { int x; };
struct C1 : C0 { virtual void f(); int y; };
// Converting C0* to C1* is non-trivial
struct A {
virtual C0 *foo(); // in vftable slot #0.
virtual C0 *bar(); // in vftable slot #1.
};
struct B : virtual A {
virtual C1 *foo(); // appended to the A subobject's vftable in slot #2.
};
struct C : virtual A {
virtual C1 *bar(); // appended to the A subobject's vftable in slot #2.
};
struct D : B, C {};
// It's ambiguous what's in the slot #2 of the A subobject's vftable.
------------------------
CL issues this compiler error:
"vftable.cpp(17) : error C2250: 'D' : ambiguous inheritance of 'C1
*A::foo(void)'",
Clang should do something similar. Currently, it just lays out the vftable,
putting foo() at the end, thus such code may misbehave at run time.</pre>
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