<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 --- - Analyzer cannot determine std::string empty"
   href="http://llvm.org/bugs/show_bug.cgi?id=20798">20798</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Analyzer cannot determine std::string empty
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>trunk
          </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>Static Analyzer
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>Jani_Lahtinen@mcafee.com
          </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=12950" name="attach_12950" title="Test code">attachment 12950</a> <a href="attachment.cgi?id=12950&action=edit" title="Test code">[details]</a></span>
Test code

Possible a duplicate of <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Analyzer does not realise list is not empty"
   href="show_bug.cgi?id=19161">bug 19161</a>, but the static analyzer fails to infer
whether std::string is emtpy. For the attached code scan-build says:

tst.cc:45:7: warning: Assigned value is garbage or undefined
  xxx = x;
      ^ ~
1 warning generated.
scan-build: 1 bug found.


But when the program is run one can see that it is not the case.</pre>
        </div>
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