[PATCH] Protection against stack-based memory corruption errors using SafeStack: compiler-rt runtime support library

[Peter Collingbourne]

- Use internal_{mmap,munmap,mprotect} functions in sanitizer_common
- Remove Darwin platform-specific TLS code
- Tweak comment
- Remove Makefile stuff
- Add test descriptions
- Rename flag to -fsanitize=safe-stack


http://reviews.llvm.org/D6096

Files:
  CMakeLists.txt
  cmake/config-ix.cmake
  lib/CMakeLists.txt
  lib/safestack/CMakeLists.txt
  lib/safestack/safestack.cc
  test/CMakeLists.txt
  test/safestack/CMakeLists.txt
  test/safestack/check-buffer-copy.c
  test/safestack/check-init.c
  test/safestack/check-overflow.c
  test/safestack/check-pthread-cleanup.c
  test/safestack/check-pthread.c
  test/safestack/lit.cfg
  test/safestack/lit.site.cfg.in

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