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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - covariant"
href="https://bugs.llvm.org/show_bug.cgi?id=51325">51325</a>
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<th>Summary</th>
<td>covariant
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>12.0
</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>enhancement
</td>
</tr>
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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>pirkelbauer2@llnl.gov
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The attached code should be rejected (Microsoft, Intel) or print "C" (gcc,
sun/Oracle, IBM), whereas the code generated by clang++ (tested with version 6
and 12) prints "B", indicating that the pointer points at the wrong subobject.
This issue is similar but not the same as #23411, which uses virtual
inheritance.
#include <cstdio>
struct A
{
virtual ~A() {}
virtual A* clone() = 0;
};
struct B : A
{
B* clone() = 0;
virtual void prnB() { printf("B"); }
};
struct C : A
{
C* clone() = 0;
virtual void prnC() { printf("C"); }
};
struct D : B, C
{
D* clone() { return new D; /* rejected by Intel/MSVC; warning by IBM */ }
};
int main() {
D d;
C& c = d;
C* cloned = c.clone();
cloned->prnC(); // should print "C"
delete cloned;
return 0;
}</pre>
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