Re: [boost] compiling boost using C++11 atomics

Subject: Re: [boost] compiling boost using C++11 atomics
From: André Draszik (git_at_[hidden])
Date: 2016-08-29 03:29:18

On Fr, 2016-08-26 at 21:45 +0300, Peter Dimov wrote:
> André Draszik wrote:
> > 
> > Hi,
> > 
> > Is there any particular reason that boost isn't being compiled with 
> > BOOST_AC_USE_STD_ATOMIC and BOOST_SP_USE_STD_ATOMIC (by default) when 
> > C++11 support in g++ is available (g++ >= 4.7)?
> 
> Support for <atomic> in earlier C++11 implementations wasn't reliable
> enough 
> compared to shared_ptr's platform-specific implementations.
> Things nowadays have probably already reversed though, with <atomic>
> being 
> more reliable.

Thanks Peter.

>  I could turn it on by default when BOOST_NO_CXX11_HDR_ATOMICÂ 
> isn't defined,

Something like the attached?

> which according to Boost.Config would enable it on g++ 4.9Â 
> and above. 

This would enable it on g++ >= 4.8 (not >= 4.9), though.

https://github.com/boostorg/config/blob/develop/include/boost/config/stdlib/
libstdcpp3.hpp#L223

Cheers,
Andre'