[boost] libcpp.hpp always defines BOOST_NO_CXX11_HDR_ATOMIC

Subject: [boost] libcpp.hpp always defines BOOST_NO_CXX11_HDR_ATOMIC
From: Peter Dimov (lists_at_[hidden])
Date: 2014-02-28 11:05:15

The libc++ config header, libcpp.hpp, always defines 
BOOST_NO_CXX11_HDR_ATOMIC, but the libc++ that - I presume - ships with 
"Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)" appears to 
have a functional <atomic>.