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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang hangs with -O"
href="http://llvm.org/bugs/show_bug.cgi?id=20370">20370</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang hangs with -O
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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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>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chocolate_police@outlook.com
</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=12795" name="attach_12795" title="Clang will hang while this file with -O2">attachment 12795</a> <a href="attachment.cgi?id=12795&action=edit" title="Clang will hang while this file with -O2">[details]</a></span>
Clang will hang while this file with -O2
Compiling the attached .cpp file causes clang to hang when using -O2 and above
(at least 8 minutes on my machine). It could be related to <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang hangs with -O1 on switches"
href="show_bug.cgi?id=18898">bug 18898</a> since the
file contains switch statements, but this file is very small in comparison with
only 42 cases (vs. tens of thousands). I tried to reduce the code as much as I
could, but if I remove any more, the file compiles fine in no time at all.
<span class="quote">> clang --version</span >
clang version 3.4.2 (tags/RELEASE_34/dot2-final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Command to cause the hang:
clang -Wall -c -O2 optimizerhang.cpp</pre>
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