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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - analyser reports real issue, but misses use of undefined variable on the way"
href="https://bugs.llvm.org/show_bug.cgi?id=32925">32925</a>
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<th>Summary</th>
<td>analyser reports real issue, but misses use of undefined variable on the way
</td>
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<th>Product</th>
<td>tools
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>analyze
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>yann.dirson@blade-group.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18410" name="attach_18410" title="buggy for/else">attachment 18410</a> <a href="attachment.cgi?id=18410&action=edit" title="buggy for/else">[details]</a></span>
buggy for/else
Behaviour observer in 3.8, 3.9, 4.0, and snapshot of 5.0 in Debian
$ scan-build clang++ -c ./src/foo.cpp
scan-build: Using '/usr/lib/llvm-3.8/bin/clang' for static analysis
./src/foo.cpp:28:20: warning: Dereference of undefined pointer value
printf("%d\n", p->d);
^~~~
1 warning generated.
scan-build: 1 bug found.
This is a buggy implementation of a pythobun-like "for / else" idiom.
In the path leading to this, which corresponds to m==0, the (i == m) test
compares m with uninitialized variable i. It would seem logical to report this
first (the fact is, it is the root of the bug).</pre>
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