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<base href="https://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 --- - Hidden visibility vs extern template"
href="https://llvm.org/bugs/show_bug.cgi?id=25427">25427</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Hidden visibility vs extern template
</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>Linux
</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>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eugeni.stepanov@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Hidden visibility attribute on an out-of-class definition of a template class
method is ignored.
Compare the following.
Attribute on the in-class declaration works:
$ cat good.cc
template<class T>
class A {
void f(T t);
};
template<class T> __attribute__((visibility("hidden")))
void A<T>::f(T t) {}
template class A<int>;
$ clang++ ../llvm/good.cc -c && objdump -t good.o | grep ' F ' | c++filt
0000000000000000 w F .text._ZN1AIiE1fEi 000000000000000d .hidden
A<int>::f(int)
Attribute on the out-of-class definition ignored:
$ cat bad.cc
template<class T>
class A {
void f(T t);
};
template<class T>
__attribute__((visibility("hidden")))
void A<T>::f(T t) {}
template class A<int>;
$ ./bin/clang++ ../llvm/bad.cc -c && objdump -t bad.o | grep ' F ' | c++filt
0000000000000000 w F .text._ZN1AIiE1fEi 000000000000000d A<int>::f(int)</pre>
</div>
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