[Spice-devel] [spice-protocol] Use gcc builtin rather than asm for memory barriers

[Frediano Ziglio]

> 
> On Thu, Jan 07, 2016 at 09:35:34PM +0200, Uri Lublin wrote:
> > On 01/06/2016 12:26 PM, Christophe Fergeau wrote:
> > >This should make things more portable.
> > 
> > Hi Christophe,
> > 
> > This only works for building with (not too old) gcc.
> > 
> > It would be safer to check that in configure and
> > add a conditional here.
> 
> This works starting from 4.4 (sync_synchronize was available before but
> broken on x86 if I read
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36793 correctly).
> EL6 has gcc 4.4 as Frediano pointed out, so I think we'll be fine
> with this.
> 
> Christophe
>

According to https://gcc.gnu.org/releases.html gcc 4.4 was released on April 2009.
According to packages.ubuntu.com precise (12.04) supports gcc 4.4.
Unless we want to compile with a RH 5 looks like 4.4 should be available.
On the other side you never know on which environment people wants to compile stuff
but I vote to just assume gcc 4.4.

Frediano