[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

--- Comment #15 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Wed Jan  8 20:45:18 UTC 2020
New revision: 356514
URL: https://svnweb.freebsd.org/changeset/base/356514

Log:
  src.opts.mk: enable LLVM_UNWIND by default for all archs

  Only sparc64 did not enable LLVM_LIBUNWIND. After r356513 LLVM_LIBUNWIND
  should at least build on sparc64. The old DWARF unwinder will be removed
  along with GCC 4.2.1 in the near future, so switch sparc64 to use LLVM's
  unwinder in advance of the removal.  Someone with access to the obsolete
  sparc64 hardware supported by FreeBSD will have to test, and investigate
  any failures. I will gladly help, but I don't have any suitable hardware
  myself.

  PR:           233405

Changes:
  head/share/mk/src.opts.mk

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