<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/68971>68971</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [CSKY] missing `double-float` feature
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    I have written a toolchain for `csky` in `Rust` at https://github.com/rust-lang/libc/pull/3301 before.

However, when I run a simple Rust program with u128, like this
```
fn main() {
 let a = 0x12345678876543219876543223456789_u128;
 println!("{a}");
}
```
I got a segmentation fault. It seems that `-mdouble-float` is not enabled. So can anyone will help to add this feature? or guide me add it?

(I'm not sure if I'm right about the above Issue, if anyone have any idea, please fell free to tell me. Thanks!)
---
@benshi001 @zixuan-wu I noticed that you two provide many commits to `csky`, so I want to know if you can give me some advice? Thanks. 

Besides, contact to me If I could add your WeChat. My email is mingyang_ge@163.com . Thanks!
</pre>
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