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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 --- - Incorrect "Assigned value is always the same as the existing value""
href="http://llvm.org/bugs/show_bug.cgi?id=15307">15307</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Incorrect "Assigned value is always the same as the existing value"
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</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>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mwelinder@gmail.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>It appears that the static analyzer doesn't understand C structure
copies. The warning below would be correct without the "*a = *b;"
statement.
typedef struct {
int x;
int y;
} bar;
void
foo (bar *a, bar *b)
{
int x;
x = a->x;
*a = *b;
a->x = x;
}
welinder@anemone ~ $ scan-build -v make aaa.o
scan-build: 'clang' executable not found in '/usr/share/clang/scan-build/bin'.
scan-build: Using 'clang' from path: /usr/bin/clang
scan-build: Emitting reports for this run to '/tmp/scan-build-2013-02-19-5'.
/usr/share/clang/scan-build/ccc-analyzer -c -o aaa.o aaa.c
aaa.c:13:8: warning: Assigned value is always the same as the existing value
a->x = x;
~~~~ ^ ~
1 warning generated.
scan-build: 1 bugs found.
welinder@anemone ~ $ clang --version
Ubuntu clang version 3.0-6ubuntu3 (tags/RELEASE_30/final) (based on LLVM 3.0)
Target: x86_64-pc-linux-gnu
Thread model: posix</pre>
</div>
</p>
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