<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 --- - __has_trivial_constructor is true for lambdas"
   href="http://llvm.org/bugs/show_bug.cgi?id=21787">21787</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>__has_trivial_constructor is true for lambdas
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.5
          </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>Balzs.Kdr.ext@dwpbank.de
          </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=13442" name="attach_13442" title="source">attachment 13442</a> <a href="attachment.cgi?id=13442&action=edit" title="source">[details]</a></span>
source

Lambdas have deleted default constructor per 5.1.2.20, but
__has_trivial_constructor is true.

Output:
$ clang++ --version
clang version 3.5.0 (tags/RELEASE_350/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -std=c++11 clangbug.cpp 
clangbug.cpp:7:50: error: implicit instantiation of undefined template
'pb<true>'
        pb<__has_trivial_constructor(decltype(lambda))>
has_trivial_constructor;
                                                        ^
clangbug.cpp:2:8: note: template is declared here
struct pb;
       ^
1 error generated.


GCC output for reference (__has_trivial_constructor is false):
$ g++ --version
g++ (GCC) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ g++ -std=c++11 clangbug.cpp 
clangbug.cpp: In function ‘int main()’:
clangbug.cpp:7:50: error: aggregate ‘pb<false> has_trivial_constructor’ has
incomplete type and cannot be defined
  pb<__has_trivial_constructor(decltype(lambda))> has_trivial_constructor;</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>