Re: [boost] libcpp.hpp always defines BOOST_NO_CXX11_HDR_ATOMIC

Subject: Re: [boost] libcpp.hpp always defines BOOST_NO_CXX11_HDR_ATOMIC
From: Tim Blechmann (tim_at_[hidden])
Date: 2014-02-28 12:51:29

On 28/02/14 18:11, John Maddock wrote:
>> 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>.
> 
> Do you have a patch that identifies when we don't need to set that macro?

should the macro declare that the header exists, or that the
implementation is complete?

e.g. gcc/libstdc++ did support atomic<Integral> before fully supporting
atomic<>. likewise, clang/libc++ is broken, if the wrapped type is a
trivially copyable class [1].

tim

[1] http://llvm.org/bugs/show_bug.cgi?id=18097