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      <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 --- - UBSan: check size/type mismatch of global variables across modules"
   href="http://llvm.org/bugs/show_bug.cgi?id=21498">21498</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>UBSan: check size/type mismatch of global variables across modules
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>All
          </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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>y.gribov@samsung.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>C99 states that declaring same global variable with incompatible types in
different units of translation is undefined behavior (6.7.5.2 item 6). So e.g.
having int a[10]; in tmp.c and int a[100]; in tmp2.c would be a UB. We should
be able to check this easily by registering all referenced globals in .c in
libubsan via callbacks at program start. Libubsan could than find size/type
mismatches and report warning.</pre>
        </div>
      </p>
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