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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 - LLD emits corrupt version for weak symbol when using version script"
href="https://bugs.llvm.org/show_bug.cgi?id=49915">49915</a>
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<th>Summary</th>
<td>LLD emits corrupt version for weak symbol when using version script
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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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>
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<th>Component</th>
<td>ELF
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>aaronpuchert@alice-dsl.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, smithp352@googlemail.com
</td>
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<p>
<div>
<pre>When linking against a lld-linked libLLVM.so with ld.bfd I got the following
error:
/usr/bin/ld: /usr/lib64/libLLVM.so: __morestack: invalid needed version 2
/usr/bin/ld: /usr/lib64/libLLVM.so: error adding symbols: bad value
clang-12.0: error: linker command failed with exit code 1 (use -v to see
invocation)
Indeed:
<span class="quote">> readelf --wide --dyn-syms /usr/lib64/libLLVM.so.12 | grep morestack</span >
332: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __morestack@@<corrupt>
This is coming from
llvm/lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp. I've managed to
build a small reproducer that should work with 12.0.0rc5:
<span class="quote">> cat morestack.cpp</span >
extern "C" __attribute__((__weak__)) void __morestack();
unsigned long f() {
return (unsigned long)&__morestack;
}
<span class="quote">> cat script.map</span >
LLVM_13 { global: *; };
<span class="quote">> clang -c -fPIC -g morestack.cpp
> clang -fuse-ld=lld -shared -o test.so -Wl,--version-script,script.map morestack.o
> readelf --wide --dyn-syms test.so | grep __morestack</span >
5: 0000000000000000 0 NOTYPE WEAK DEFAULT UND
__morestack@@<corrupt>
Without -fuse-ld=lld, i.e. with ld.bfd I get
2: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __morestack
Now lld itself seems to fine with the corrupt version, so maybe binutils are
just overly sensitive? I don't know.</pre>
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