<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/150274>150274</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [HLSL][RootSignature] Add support for `rootsig-define` compiler flag
        </td>
    </tr>

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

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

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

<pre>
    This issue tracks implementing the DXC `rootsig-define` compiler option.

The behaviour should follow the specification [here](https://github.com/llvm/wg-hlsl/blob/main/proposals/0029-root-signature-driver-options.md#option--rootsig-define).

AC:
- [ ] Implement the `rootsig-define` driver option in `clang-dxc`
- [ ] Implement `fdx-rootsignature-define` driver option in `clang` and `cc1`
- [ ] Update `ParseDeclCXX.cpp` to only parse the root signature denoted with `rootsig-define`
- [ ] Update `ParseDeclCXX.cpp` to only parse a root signature if it will be used
</pre>
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