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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Bogus warning with -Wweak-template-vtables"
href="http://llvm.org/bugs/show_bug.cgi?id=18733">18733</a>
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<th>Summary</th>
<td>Bogus warning with -Wweak-template-vtables
</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>Linux
</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>rafael.espindola@gmail.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>Given
---------------------------
template<typename T>
class foo {
virtual ~foo() {}
};
extern template class foo<int>;
template class foo<int>;
----------------------------
clang warns:
-------------------------------
test.cpp:6:23: warning: explicit template instantiation 'foo<int>' will emit a
vtable in every translation unit [-Wweak-template-vtables]
extern template class foo<int>;
^
1 warning generated.
------------------------------
note that the warning points to the explicit template instantiation
declaration, but is triggered by the definition. This should probably be
checking if the definition is in a header. In a .cpp file there is only one
translation unit that sees it.</pre>
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