<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/134504>134504</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang: -shared -fsanitize=undefined doesn't link with libubsan
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          stsp
      </td>
    </tr>
</table>

<pre>
    ```
$ gcc -shared -o libex.so example.c -fsanitize=undefined
$ ldd libex.so
        linux-vdso.so.1 (0x000079ecce133000)
        libubsan.so.1 => /lib/x86_64-linux-gnu/libubsan.so.1 (0x000079eccda00000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x000079eccd600000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x000079eccd200000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x000079ecce0df000)
        /lib64/ld-linux-x86-64.so.2 (0x000079ecce135000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x000079eccd913000)

$ clang -shared -fsanitize=undefined -o libex.so example.c
$ ldd libex.so
        linux-vdso.so.1 (0x000077ad748b4000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x000077ad74600000)
        /lib64/ld-linux-x86-64.so.2 (0x000077ad748b6000)
```

As the result, when used with
`-Wl,--no-undefined` this breaks
on clang, but works properly with
gcc.
</pre>
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