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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 'Undefined reference's with explicit instantiation of template class with virtual members"
href="https://bugs.llvm.org/show_bug.cgi?id=38823">38823</a>
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<th>Summary</th>
<td>'Undefined reference's with explicit instantiation of template class with virtual members
</td>
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<th>Product</th>
<td>OpenMP
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>Clang Compiler Support
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>hahnjo@hahnjo.de
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20836" name="attach_20836" title="source code detailing the problem">attachment 20836</a> <a href="attachment.cgi?id=20836&action=edit" title="source code detailing the problem">[details]</a></span>
source code detailing the problem
Consider something like the following:
$ cat virtual.cpp
template <typename T>
struct Base {
virtual ~Base() {}
virtual void test() const {}
void offload() {
#pragma omp target
{}
}
};
#ifndef IMPLICIT
template class Base<int>;
#endif
int main(int argc, char *argv[]) {
#ifdef IMPLICIT
Base<int> b;
#endif
return 0;
}
$ clang++ -fopenmp -fopenmp-targets=nvptx64-nvidia-cuda virtual.cpp
[...]
Undefined reference to '_ZdlPv'
Undefined reference to '_ZTVN10__cxxabiv117__class_type_infoE'
[...]
$ c++filt _ZdlPv
operator delete(void*)
$ c++filt _ZTVN10__cxxabiv117__class_type_infoE
vtable for __cxxabiv1::__class_type_info
Additional notes:
1) When instantiating the template implicitly (-DIMPLICIT), the error goes
away.
2) The vtable for __class_type_info goes away when compiling with -fno-rtti.
3) Commenting out the virtual destructor removes the reference to "operator
delete". I think the destructor is emitted because it is listed in the classes
vtable?</pre>
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