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    <head>
      <base href="http://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 --- - Instantiating operator<< for std::basic_ostream<char32_t> fails"
   href="http://llvm.org/bugs/show_bug.cgi?id=18010">18010</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Instantiating operator<< for std::basic_ostream<char32_t> fails
          </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>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>hhinnant@apple.com
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>stuart_olsen@txstate.edu
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>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=11575" name="attach_11575" title="Source code and errors for this bug">attachment 11575</a> <a href="attachment.cgi?id=11575&action=edit" title="Source code and errors for this bug">[details]</a></span>
Source code and errors for this bug

Under clang 3.4 (trunk 194413) and libc++ (trunk 194418), trying to use
operator<< to print a UTF-32 string literal to a std::basic_ostream<char32_t>
results in an implicit instantiation of an undefined template, and thus an
error.

Compiling reproduce.cc (attached) yields the attached error messages using
'clang++ -std=c++1y -stdlib=libc++ reproduce.cc'. This actually caused clang to
crash one while I was reducing the code to the problematic portions, but I have
not been able to reproduce this.</pre>
        </div>
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