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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LLVM 3.8/trunk LTO no longer supports -Os flag?"
href="https://llvm.org/bugs/show_bug.cgi?id=27376">27376</a>
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<th>Summary</th>
<td>LLVM 3.8/trunk LTO no longer supports -Os flag?
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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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>
</tr>
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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>steven@uplinklabs.net
</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>Does LTO no longer support -Os? This commit added a range check on the -O<n>
value, and rejects the -Os flag:
commit 416d8ecf80eafaefecc8e934930a2285a66a93d8
Author: Peter Collingbourne <<a href="mailto:peter@pcc.me.uk">peter@pcc.me.uk</a>>
Date: Thu Mar 19 22:01:00 2015 +0000
libLTO, llvm-lto, gold: Introduce flag for controlling optimization level.
This change also introduces a link-time optimization level of 1. This
optimization level runs only the globaldce pass as well as cleanup passes
for
passes that run at -O0, specifically simplifycfg which cleans up
lowerbitsets.
<a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150316/266951.html">http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150316/266951.html</a>
git-svn-id: <a href="https://llvm.org/svn/llvm-project/llvm/trunk@232769">https://llvm.org/svn/llvm-project/llvm/trunk@232769</a>
91177308-0d34-0410-b5e6-96231b3b80d8
It results in this error at link time:
/usr/bin/ld: error: Optimization level must be between 0 and 3</pre>
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