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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang should warn when using pointer to dead scoped variable within the same function"
href="http://llvm.org/bugs/show_bug.cgi?id=20952">20952</a>
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<th>Summary</th>
<td>Clang should warn when using pointer to dead scoped variable within the same function
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jacob.benoit.1@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13044" name="attach_13044" title="testcase">attachment 13044</a> <a href="attachment.cgi?id=13044&action=edit" title="testcase">[details]</a></span>
testcase
Consider this testcase:
int foo(int i)
{
int *p = 0;
if (i)
{
int k = i;
p = &k;
} /* end of nested scope, k dies, p becomes a dangling pointer */
return p ? *p : 0; /* the compiler should warn that p points to dead k */
}
Neither Clang 3.4 nor GCC 4.8 currently generate a warning. Yet, since all is
local to this function, it seems like something that a compiler could easily
warn against, and that would have saved me some time today!</pre>
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