[PATCH] D21201: [libcxxabi] Don't check gcc_s when building with libunwind

[Saleem Abdulrasool via llvm-commits]

compnerd requested changes to this revision.
compnerd added a comment.
This revision now requires changes to proceed.

Unfortunately, `__gcc_personality_v0` is not provided by libc as it should, but rather the compiler builtins.  Using the LLVM unwinder does not guarantee that we are using clang_rt.builtins rather than libgcc.  Changing this to check if we are using -rtlib=compiler-rt seems much more reasonable.

But, otherwise, this is a great idea.


Repository:
  rL LLVM

http://reviews.llvm.org/D21201