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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang-CL error on inheritance from template supplied internal type"
href="https://llvm.org/bugs/show_bug.cgi?id=31903">31903</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang-CL error on inheritance from template supplied internal type
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>steveire@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>MS CL.exe differs in behavior from Clang-CL
$ type ..\templ_inst.cpp
namespace {
class Internal {};
}
class __declspec(dllexport) NotTempl : public Internal
{
};
template<typename T>
class __declspec(dllexport) Templ : public T
{
};
int main()
{
NotTempl nt;
Templ<Internal> ta;
return 0;
}
$ C:\dev\src\llvm\build\releaseprefix\msbuild-bin\CL.exe ..\templ_inst.cpp
..\templ_inst.cpp(11,29): error: 'Templ<(anonymous namespace)::Internal>' must
have external linkage when declared 'dllexport'
class __declspec(dllexport) Templ : public T
^
..\templ_inst.cpp(18,18): note: in instantiation of template class
'Templ<(anonymous namespace)::Internal>' requested here
Templ<Internal> ta;
^
1 error generated.
$ CL.exe ..\templ_inst.cpp
/out:templ_inst.exe
templ_inst.obj
Creating library templ_inst.lib and object templ_inst.exp</pre>
</div>
</p>
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