tree a020ac68153c5d3652b05fbab5e8124c28f66641
parent 40213fe60eb4f05294192911b58ddab0b27a2efd
author Reid Kleckner <reid@kleckner.net> 1412366627 +0000
committer Reid Kleckner <reid@kleckner.net> 1412366627 +0000

Use __atomic_exchange_n instead of Clang's __sync_swap

Also remove an extra extern "C" from a global variable redeclaration.
This allows building libcxxabi with GCC on my system.

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D5604

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@219012 91177308-0d34-0410-b5e6-96231b3b80d8