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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LTO doesn't allow optimization by size"
href="https://bugs.llvm.org/show_bug.cgi?id=38305">38305</a>
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<th>Summary</th>
<td>LTO doesn't allow optimization by size
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
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<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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>lto
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mh+llvm@glandium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ clang -fuse-ld=gold -o t main.c -Os -flto=thin
/usr/bin/ld.gold: fatal error: Optimization level must be between 0 and 3
clang: error: linker command failed with exit code 1 (use -v to see invocation)
(Same with -Oz)
The error message is emitted by the llvm plugin, not gold (it's in
tools/lto/lto.cpp).
Interestingly, it fails at another level when using lld:
$ clang -fuse-ld=lld -o t main.c -Os -flto=thin
/usr/lib/llvm-6.0/bin/ld.lld: error: --plugin-opt: number expected, but got 's'
clang: error: linker command failed with exit code 1 (use -v to see invocation)</pre>
</div>
</p>
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