[Bug 233405] sparc64: DWARF unwinder required for GCC 4.2.1 retirement

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233405

            Bug ID: 233405
           Summary: sparc64: DWARF unwinder required for GCC 4.2.1
                    retirement
           Product: Base System
           Version: CURRENT
          Hardware: sparc64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: emaste at freebsd.org
            Blocks: 228919, 233094

GCC 4.2.1's retirement is expected before FreeBSD 13.0. This will also remove
GCC's libgcc including the DWARF unwinder.

LLVM's libunwind provides the replacement for most architectures but does not
currently support sparc64.


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228919
[Bug 228919] GCC 4.2.1 removal
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233094
[Bug 233094] [meta] Base system tool chain modernization tracking
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