Re: [boost] [thread] Can Boost.Thread use Boost.Atomic withoutfalling on a compatibility issue?

Subject: Re: [boost] [thread] Can Boost.Thread use Boost.Atomic withoutfalling on a compatibility issue?
From: Peter Dimov (lists_at_[hidden])
Date: 2013-01-14 13:11:23

Howard Hinnant wrote:
> There are a couple of places in libc++ that need to be retrofitted to use 
> <atomic>.  In the cases where that retrofit is in a header (i.e. 
> call_once), the retrofit will currently need to be protected by 
> __has_feature(cxx_atomic) as clang shuts this feature off in C++03 mode.

Not very on-topic, but... what does it mean that clang shuts the feature 
off? I see in <atomic> that you issue an #error when 
!__has_feature(cxx_atomic), but what would happen if this is removed? Don't 
the C11 intrinsics work regardless?