<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Implicit move destructor implicitly deleted when base class is trivially copyable"
href="http://llvm.org/bugs/show_bug.cgi?id=18005">18005</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Implicit move destructor implicitly deleted when base class is trivially copyable
</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>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bmerry@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>Created <span class=""><a href="attachment.cgi?id=11572" name="attach_11572" title="Sample case">attachment 11572</a> <a href="attachment.cgi?id=11572&action=edit" title="Sample case">[details]</a></span>
Sample case
I'm using the Clang 3.4 snapshot shipped with Ubuntu 13.10:
$ clang++ -v
Ubuntu clang version 3.4-1ubuntu1 (trunk) (based on LLVM 3.4)
Target: x86_64-pc-linux-gnu
Thread model: posix
The attached program generates an error (pasted at the end). It appears that
Clang is not implicitly defining a move constructor for B, but as far as I can
see it ought to. B has no user-declared special members, so 12.8.10 comes into
play; and while A does not have a move constructor, it is trivially copyable,
so the last bullet of 12.8.12 does not apply.
GCC successfully compiles this code, although GCC also has a bug in this area
(<a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59213">http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59213</a>) so perhaps not too much
should be read into that.
$ clang++ -std=c++11 -c move.cpp
move.cpp:26:12: error: call to implicitly-deleted copy constructor of 'B'
return B();
^~~
move.cpp:21:7: note: copy constructor of 'B' is implicitly deleted because
field 'p' has a deleted copy constructor
C p;
^
move.cpp:8:5: note: function has been explicitly marked deleted here
C(const C &) = delete;
^
1 error generated.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>