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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 - Linker error when using LTO with Fuzzer on Windos"
href="https://bugs.llvm.org/show_bug.cgi?id=45658">45658</a>
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<th>Summary</th>
<td>Linker error when using LTO with Fuzzer on Windos
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>markus.boeck02@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>When using libFuzzer on Windows using clang-cl and LTO (both full and thin) the
linking stage later fails with undefined reference to __sancov_lowest_stack.
Tested cpp file:
#include <iostream>
#include <cstring>
extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t* data, std::size_t
size)
{
std::string s(size,' ');
std::memcpy(s.data(),data,size);
std::cout << s;
return 0;
}
CMD:
Input: clang-cl /MT -fsanitize=fuzzer -fuse-ld=lld -flto test.cpp -std:c++17
lld-link: error: undefined symbol: __sancov_lowest_stack
>>> referenced by test.cpp
<span class="quote">>>> C:\Users\Markus\AppData\Local\Temp\test-bae0e8.obj </span >
clang-cl: error: linker command failed
with exit code 1 (use -v to see invocation)</pre>
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