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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No warning for unused computed values in comma expressions"
href="http://llvm.org/bugs/show_bug.cgi?id=18561">18561</a>
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<th>Summary</th>
<td>No warning for unused computed values in comma expressions
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chengniansun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang does not warn unused expression computed in a comma expression. Please
refer to the following steps:
$: cat unused-computed-value.c
int f(void) {return 0;}
int g(int a) {
return (f() && a), 1;
}
$: clang-trunk -Wunused-value -c unused-computed-value.c
$: clang-trunk --version
clang version 3.5 (trunk 199549)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$: gcc-trunk -Wunused-value -c unused-computed-value.c
unused-computed-value.c: In function ‘g’:
unused-computed-value.c:4:15: warning: value computed is not used
[-Wunused-value]
return (f() && a), 1;
^</pre>
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