<html>
    <head>
      <base href="https://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 --- - -Wabsolute-value gives false positives"
   href="https://llvm.org/bugs/show_bug.cgi?id=23204">23204</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wabsolute-value gives false positives
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.6
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </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>Frontend
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>mayer.julian@googlemail.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>version is Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)


the new absolute value warning in xcode 4.3 seems bugged

it gives a warning on this code:

    printf("\n\n\n%li\n\n",
           labs([@"12345" length] - [@"1234567" length]));


which outputs "2". it says the labs() is not necessary.

however, when removing it the output is -2. so the warning clearly directs
users into making wrong code changes...</pre>
        </div>
      </p>
      <hr>
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      <ul>
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