[PATCH] D24984: [libunwind] Add support for a single-threaded libunwind build

[Asiri Rathnayake via cfe-commits]

rmaprath created this revision.
rmaprath added reviewers: jroelofs, compnerd, logan.
rmaprath added a subscriber: cfe-commits.
Herald added subscribers: mgorny, beanz.

The EHABI unwinder is thread-agnostic, SJLJ unwinder and the DWARF unwinder have a couple of `pthread` dependencies.

This patch makes it possible to build the whole of `libunwind` for a single-threaded environment.

https://reviews.llvm.org/D24984

Files:
  CMakeLists.txt
  src/CMakeLists.txt
  src/UnwindCursor.hpp
  src/Unwind_AppleExtras.cpp
  src/config.h

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