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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Explicit template instantiations do not instantiate explicitly defaulted special members"
href="http://llvm.org/bugs/show_bug.cgi?id=22763">22763</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Explicit template instantiations do not instantiate explicitly defaulted special members
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dblaikie@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat foo.h
struct base {
virtual ~base() {};
};
template <typename T>
struct foo : base {
foo() {};
foo(const foo&)
#ifdef DEFAULT
= default;
#else
{}
#endif
};
__extension__ extern template struct foo<int>;
$ cat ext.cpp
#include "foo.h"
int main() {
foo<int> f;
foo<int> g = f;
}
$ cat ext2.cpp
#include "foo.h"
template struct foo<int>;
$ clang++-tot ext.cpp -std=c++11 ext2.cpp
$ clang++-tot ext.cpp -std=c++11 ext2.cpp -DDEFAULT
/tmp/ext-f809ea.o:ext.cpp:function main: error: undefined reference to
'foo<int>::foo(foo<int> const&)'
clang-3.5: error: linker command failed with exit code 1 (use -v to see
invocation)
$</pre>
</div>
</p>
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