[llvm-bugs] [Bug 45658] New: Linker error when using LTO with Fuzzer on Windos

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45658

            Bug ID: 45658
           Summary: Linker error when using LTO with Fuzzer on Windos
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: markus.boeck02 at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

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             
                                                                               
>>>               C:\Users\Markus\AppData\Local\Temp\test-bae0e8.obj           
                                        clang-cl: error: linker command failed
with exit code 1 (use -v to see invocation)

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