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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - excessive compile time with -O2"
href="https://llvm.org/bugs/show_bug.cgi?id=28382">28382</a>
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<th>Summary</th>
<td>excessive compile time with -O2
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dcb314@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The attached code seems to take a long time with -O2
$ time ./results/bin/clang -c -O2 glew-b77619.c
real 15m51.212s
user 15m49.941s
sys 0m0.202s
$ time ./results/bin/clang -c glew-b77619.c
real 0m9.283s
user 0m8.964s
sys 0m0.043s
$ ./results/bin/clang -v
clang version 3.9.0 (trunk 274110)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/dcb/llvm/./results/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/6.1.1
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
[dcb@dhcppc1 llvm]$
Anything up to five minutes seems reasonable, but over 15 minutes seems
a bit much.</pre>
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