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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 - incomplete type with gcc and libc++ when overloading std::swap"
href="https://bugs.llvm.org/show_bug.cgi?id=49659">49659</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>incomplete type with gcc and libc++ when overloading std::swap
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yichen.yan@inf.ethz.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24662" name="attach_24662" title="test.clang.merged.proc.cc">attachment 24662</a> <a href="attachment.cgi?id=24662&action=edit" title="test.clang.merged.proc.cc">[details]</a></span>
test.clang.merged.proc.cc
I'm following the instructions on <a href="https://libcxx.llvm.org/docs/UsingLibcxx.html">https://libcxx.llvm.org/docs/UsingLibcxx.html</a>
to use libc++ with gcc,
and have met this failure:
root@24a281e738f9:/test/clang# /usr/bin/c++ -nostdinc++
-I/libcxx-install-11/include/c++/v1 -o /dev/null -c test.clang.merged.proc.cc
test.clang.merged.proc.cc: In instantiation of 'Pointer<T>::Pointer(const
Pointer<T>&) [with T = d]':
/libcxx-install-11/include/c++/v1/type_traits:4075:9: required from 'typename
std::__1::enable_if<(std::__1::is_move_constructible<_Tp>::value &&
std::__1::is_move_assignable<_Tp>::value)>::type std::__1::swap(_Tp&, _Tp&)
[with _Tp = Pointer<d>; typename
std::__1::enable_if<(std::__1::is_move_constructible<_Tp>::value &&
std::__1::is_move_assignable<_Tp>::value)>::type = void]'
test.clang.merged.proc.cc:39:46: required from here
test.clang.merged.proc.cc:23:33: error: invalid use of incomplete type 'class
d'
Pointer(const Pointer &) { b->c; }
~~~^
test.clang.merged.proc.cc:30:7: note: forward declaration of 'class d'
class d;
^
Notably, this works with clang and {libstdc++,libc++}.</pre>
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