Fix _Unwind_Backtrace for libc++abi built with libgcc.
authorLogan Chien <tzuhsiang.chien@gmail.com>
Thu, 22 Jan 2015 13:28:39 +0000 (13:28 +0000)
committerLogan Chien <tzuhsiang.chien@gmail.com>
Thu, 22 Jan 2015 13:28:39 +0000 (13:28 +0000)
commita713fce5399276459d7c5881619b5349739a10c0
tree11fbfd98b39647240a1dc9c23a3d872683acb24c
parent4947eb6e56934a23a7c6daebddb0f240850cb3eb
Fix _Unwind_Backtrace for libc++abi built with libgcc.

Implement an undocumented _US_FORCE_UNWIND flag for force
unwinding.

llvm-svn: 226820
libcxxabi/include/unwind.h
libcxxabi/src/cxa_personality.cpp