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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Compilation of exported class gives errors when class is not copyable and/or copy-assignable"
href="http://llvm.org/bugs/show_bug.cgi?id=22591">22591</a>
</td>
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<th>Summary</th>
<td>Compilation of exported class gives errors when class is not copyable and/or copy-assignable
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows XP
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eldlistmailingz@tropicsoft.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Compiling the latest clang built from trunk on Windows targeting mingw/gcc with
options '-c -x c++ -O0 -g -fno-inline -Wall -g':
#include <boost/scoped_ptr.hpp>
class __attribute__((dllexport))
AClass { boost::scoped_ptr<int> sp_pointer; };
int main() { return 0; }
gives:
'test_clang_bug.cpp:3:1: error: field of type 'boost::scoped_ptr<int>' has
private copy constructor
AClass { boost::scoped_ptr<int> sp_pointer; };
^
..\..\..\boost/smart_ptr/scoped_ptr.hpp:47:5: note: declared private here
scoped_ptr(scoped_ptr const &);
^
test_clang_bug.cpp:3:1: note: implicit copy constructor for 'AClass' first
required here
AClass { boost::scoped_ptr<int> sp_pointer; };
^
test_clang_bug.cpp:3:1: error: 'operator=' is a private member of
'boost::scoped_ptr<int>'
AClass { boost::scoped_ptr<int> sp_pointer; };
^
..\..\..\boost/smart_ptr/scoped_ptr.hpp:48:18: note: declared private here
scoped_ptr & operator=(scoped_ptr const &);
^
test_clang_bug.cpp:3:1: note: implicit copy assignment operator for 'AClass'
first required here
AClass { boost::scoped_ptr<int> sp_pointer; };
^
2 errors generated.'
The class boost::scoped_ptr<T> is non-copyable and non-assignable.
Compiling the exact same code with mingw/mingw64/gcc and compiling the same
code with VC++12 using '__declspec(dllexport)' as the export keyword gives no
errors.
This issue has been discussed on the clang developer's list and I have been
asked to file a bug report for this issue.
The problem with a more complicated class occurs in Boost libraries where a
class with a non-copyable, non-assignable member and without any user-defined
copy constructor or copy-assignment operator is being exported and clang on
Windows targeting mingw/gcc is the compiler. I would also suspect that clang-cl
has the same problem although I have not tested it.</pre>
</div>
</p>
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