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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang -flto -Os/-Oz passes -Os/-Oz to lld (but lld doesn't know what to do with it)"
href="https://bugs.llvm.org/show_bug.cgi?id=42445">42445</a>
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<th>Summary</th>
<td>clang -flto -Os/-Oz passes -Os/-Oz to lld (but lld doesn't know what to do with it)
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>bero@lindev.ch
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>clang with -flto passes optimization levels to lld unmodified -- even if the
optimization level is one lld doesn't understand, such as -Os or -Oz.
This makes -flto with -Os/-Oz unusable.
$ clang -Os -fuse-ld=lld -flto test.c
ld.lld: error: -plugin-opt=Os: number expected, but got 's'
clang-9: error: linker command failed with exit code 1 (use -v to see
invocation)
$ clang -Oz -fuse-ld=lld -flto test.c
ld.lld: error: -plugin-opt=Oz: number expected, but got 'z'
clang-9: error: linker command failed with exit code 1 (use -v to see
invocation)</pre>
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