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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - False warning: unsequenced modification and access to"
href="http://llvm.org/bugs/show_bug.cgi?id=22197">22197</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>False warning: unsequenced modification and access to
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.5
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>FreeBSD
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>stefanf@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13667" name="attach_13667" title="Source code showing the false warning">attachment 13667</a> <a href="attachment.cgi?id=13667&action=edit" title="Source code showing the false warning">[details]</a></span>
Source code showing the false warning
When compiling the attached code with -Wunsequenced, clang issues a warning
that I believe is incorrect:
---
$ c++ -Wunsequenced -c test.cpp
test.cpp:5:12: warning: unsequenced modification and access to 'i'
[-Wunsequenced]
if ((i = f1(), true) && (j = f2(i))) {
^ ~
1 warning generated.
---
There should be sequence points between the operands of the comma-operator and
those of &&.
If you wonder about "true", the code is generated and the condition will not
always be constant true.
Interestingly, the same code does not issue a warning when compiled as C code.</pre>
</div>
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