Re: [boost] clang support for __sync_* intrinsics

Subject: Re: [boost] clang support for __sync_* intrinsics
From: Peter Dimov (lists_at_[hidden])
Date: 2014-02-28 12:35:58

Andrey Semashev wrote:
> On Fri, Feb 28, 2014 at 8:00 PM, Peter Dimov <lists_at_[hidden]> wrote:
> > Does anyone know what is the earlier version of Clang that supports the 
> > __sync_* intrinsics?
>
> I don't know what was the earliest one but you could use __has_builtin 
> macro to check for its presence.

Yes, I figured that out slightly after I sent the mail. Version checks are 
not the Clang way and are a symptom of an outdated mentality. :-)

> You can also use __GCC_HAVE_SYNC_COMPARE_AND_SWAP_N macros...

Interestingly, it turns out that I already do that. The problem prompting

https://svn.boost.org/trac/boost/ticket/9315

is probably that an earlier #ifdef path is taken instead.