<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/155215>155215</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            lld doesn't support TLSDESC (-mtls-dialect=gnu2) for arm
        </td>
    </tr>

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

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

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

<pre>
    lld does not support TLSDESC (-mtls-dialect=gnu2) for arm. We are currently looking to make `-mtls-dialect=gnu2` the default for x86 in GCC. ARM may follow depending on how that goes.

```c
extern __thread int tlsdesc;
int get(void) { return tlsdesc; }
```

```
$ gcc a.c -shared -fuse-ld=lld -mtls-dialect=gnu2 -fPIC
ld.lld: error: /tmp/ccvULiJP.o:(function get: .text+0xc): unknown relocation (91) against symbol tlsdesc
ld.lld: error: internal linker error: cannot read addend for relocation R_ARM_TLS_CALL
ld.lld: error: /tmp/ccvULiJP.o:(function get: .text+0x24): unknown relocation (90) against symbol tlsdesc
ld.lld: error: internal linker error: cannot read addend for relocation R_ARM_TLS_GOTDESC
collect2: error: ld returned 1 exit status
```
</pre>
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