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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - 0-sized vftable in the presence of virtual inheritance"
href="http://llvm.org/bugs/show_bug.cgi?id=19066">19066</a>
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<th>Summary</th>
<td>0-sized vftable in the presence of virtual inheritance
</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>
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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
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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>[from PR18967]
struct A { virtual void f() {} };
struct B : virtual A {};
struct C : virtual B, A {};
C c;
This test case is from PR17748.
We generate an empty vftable for the non-virtual A in C:
VFTable for 'A' in 'B' in 'C' (1 entries).
0 | void A::f()
VFTable for 'A' in 'C' (0 entries).
Which gives this IR:
@"\01??_7C@@6BA@@@" = linkonce_odr unnamed_addr constant [0 x i8*]
zeroinitializer
@"\01??_7C@@6BB@@@" = linkonce_odr unnamed_addr constant [1 x i8*] [i8* bitcast
(void (%struct.A*)* @"\01?f@A@@UAEXXZ" to i8*)]
Which crashes the COFF writer as reported in PR18993.</pre>
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