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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - variable reassignment in switch not detected ?"
href="http://llvm.org/bugs/show_bug.cgi?id=20950">20950</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>variable reassignment in switch not detected ?
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dcb314@hotmail.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>Given the following source code
void f(int n)
{
int m;
switch (n)
{
case 1: m = 2;
case 2: m = 3;
case 3: m = 4;
case 4: m = 5;
}
}
Here is trunk clang++:
$ ~/llvm/results/bin/clang++ -c -g -O2 -Wall jun23b.cc
$
Here is trunk gcc warning about something else:
$ ~/gcc/results/bin/g++ -c -g -O2 -Wall jun23b.cc
jun23b.cc: In function ‘void f(int)’:
jun23b.cc:4:6: warning: variable ‘m’ set but not used
[-Wunused-but-set-variable]
int m;
^
$
And here is trunk cppcheck finding the problem
$ ~/cppcheck/trunk/cppcheck --enable=all jun23b.cc
Checking jun23b.cc...
[jun23b.cc:8] -> [jun23b.cc:9]: (warning) Variable 'm' is reassigned a value
before the old one has been used. 'break;' missing?
[jun23b.cc:9] -> [jun23b.cc:10]: (warning) Variable 'm' is reassigned a value
before the old one has been used. 'break;' missing?
[jun23b.cc:10] -> [jun23b.cc:11]: (warning) Variable 'm' is reassigned a value
before the old one has been used. 'break;' missing?
$</pre>
</div>
</p>
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