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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - aarch64-windows: fatal error "SEH unwind data splitting not yet implemented""
   href="https://bugs.llvm.org/show_bug.cgi?id=40311">40311</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>aarch64-windows: fatal error "SEH unwind data splitting not yet implemented"
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>7.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>new bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dmajor@mozilla.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>efriedma@codeaurora.org, htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, rnk@google.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>With LLVM trunk plus the not-yet-landed SEH support in
<a href="https://reviews.llvm.org/D53540">https://reviews.llvm.org/D53540</a>, a clang-cl build of Firefox for
aarch64-windows hits this error:
<a href="https://github.com/llvm-mirror/llvm/commit/a9be23987d154b0bb53c156c47ae261161af87e8">https://github.com/llvm-mirror/llvm/commit/a9be23987d154b0bb53c156c47ae261161af87e8</a>

Are there any plans to implement the unwind data splitting or epilog code
sharing? This looks like the last remaining hurdle for Firefox to use clang-cl
with aarch64-windows builds, so we're pretty keen to follow along with the
progress.

I'm assuming that no reproducer is needed because this is a known limitation,
but let me know if I should include one.</pre>
        </div>
      </p>


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