[llvm-bugs] [Bug 40311] New: aarch64-windows: fatal error "SEH unwind data splitting not yet implemented"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40311

            Bug ID: 40311
           Summary: aarch64-windows: fatal error "SEH unwind data
                    splitting not yet implemented"
           Product: new-bugs
           Version: 7.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dmajor at mozilla.com
                CC: efriedma at codeaurora.org, htmldeveloper at gmail.com,
                    llvm-bugs at lists.llvm.org, rnk at google.com

With LLVM trunk plus the not-yet-landed SEH support in
https://reviews.llvm.org/D53540, a clang-cl build of Firefox for
aarch64-windows hits this error:
https://github.com/llvm-mirror/llvm/commit/a9be23987d154b0bb53c156c47ae261161af87e8

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.

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