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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 - clang passes meaningless flags to lld when targeting MacOS"
href="https://bugs.llvm.org/show_bug.cgi?id=34792">34792</a>
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<th>Summary</th>
<td>clang passes meaningless flags to lld when targeting MacOS
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>5.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Unpack the official Clang 5 .tar.xz from <a href="http://releases.llvm.org/download.html">http://releases.llvm.org/download.html</a>
and try to use it with the bundled copy of LLD:
$ ~/clang+llvm-5.0.0-x86_64-apple-darwin/bin/clang++ numbers.cpp -fuse-ld=lld
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/bin/ld.lld: error: unknown
argument: -no_deduplicate
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/bin/ld.lld: error: unknown
argument: -dynamic
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/bin/ld.lld: error: unknown
argument: -arch
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/bin/ld.lld: error: unknown
emulation: acosx_version_min
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/bin/ld.lld: error: unable
to find library -lto_library
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/bin/ld.lld: error:
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/lib/libLTO.dylib: invalid
data encoding
clang-5.0: error: linker command failed with exit code 1 (use -v to see
invocation)
Oops.
>From clang -v, we see that Clang is passing Apple-linker-specific flags to
ld.lld:
"/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/bin/ld.lld" -demangle
-lto_library
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/lib/libLTO.dylib
-no_deduplicate -dynamic -arch x86_64 -macosx_version_min 10.12.0 -o a.out
/var/folders/00/14vvr000h01000cxqpysvccm004lgg/T/numbers-0d20ee.o -lc++
-lSystem
/Users/zygoloid/clang+llvm-5.0.0-x86_64-apple-darwin/lib/clang/5.0.0/lib/darwin/libclang_rt.osx.a
Either -fuse-ld=lld should not be supported or it should pass meaningful flags.</pre>
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