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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - _Generic -Wdivision-by-zero bogus warning"
href="https://llvm.org/bugs/show_bug.cgi?id=25390">25390</a>
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<th>Summary</th>
<td>_Generic -Wdivision-by-zero bogus warning
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.5
</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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>eggert@cs.ucla.edu
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15208" name="attach_15208" title="program illustrating bogus warning">attachment 15208</a> <a href="attachment.cgi?id=15208&action=edit" title="program illustrating bogus warning">[details]</a></span>
program illustrating bogus warning
With the attached program, clang complains
u.c:5:47: warning: division by zero is undefined [-Wdivision-by-zero]
int j = _Generic (i, int: 0, default: 0 ? 1 / 0 : 1);
^ ~
The warning is bogus because the expression is not evaluated, for two reasons:
first, it's inside a _Generic alternative not taken; second, it's inside an
if-branch that's not taken.</pre>
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