[Beignet] beignet doesnt compile with LLVM 3.6

[Zou, Nanhai]

> -----Original Message-----
> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> Zou, Nanhai
> Sent: Wednesday, February 11, 2015 2:28 PM
> To: Zhigang Gong; Steven Newbury
> Cc: junyan.he at linux.intel.com; Paulo Dias; Yang, Rong R;
> beignet at lists.freedesktop.org
> Subject: Re: [Beignet] beignet doesnt compile with LLVM 3.6
> 
> 
> 
> > -----Original Message-----
> > From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf
> > Of Zhigang Gong
> > Sent: Wednesday, February 11, 2015 12:37 PM
> > To: Steven Newbury
> > Cc: junyan.he at linux.intel.com; Paulo Dias; Yang, Rong R;
> > beignet at lists.freedesktop.org
> > Subject: Re: [Beignet] beignet doesnt compile with LLVM 3.6
> >
> > On Tue, Feb 10, 2015 at 02:47:56PM +0000, Steven Newbury wrote:
> > >
> > > On Thu, 2014-10-30 at 02:22 +0000, Yang, Rong R wrote:
> > > > Because LLVM change the head file frequently, Beignet only support
> > > > the released version LLVM, from 3.3 to 3.5. You can get this
> > > > information from Beignet wiki:
> > > > http://www.freedesktop.org/wiki/Software/Beignet/.
> > > >
> > >
> > >
> > >
> > > This is just a suggestion; but wouldn't it be better to have Beignet
> > > master track the upstream "stable" LLVM branch, ie. currently 3.6
> > > pre- release, and have release versions of Beignet target the
> > > currently released LLVM version with bugfix, and possibly stable feature
> updates?
> > >
> > > This way Beignet isn't always playing catch up when new LLVM
> > > versions appear and doesn't cause distributors issues with multiple
> > > LLVM version requirements between Mesa and Beignet.
> > >
> > > Downside, of course, is Beignet developers would have to change
> > > their development process to include building of the branched
> > > "stable" LLVM when working on master branch to ensure no breakage
> occurs.
> > >
> >
> > This is a good suggestion. But it may not be easy for us to fully follow.
> > As you may know, upgrading to a new LLVM version always causes some
> > issues and some of them are not easy to fix. Considering we have the
> > following to do
> > items:
> >
> > 1. Enable BDW
> > 2. Enable SKL
> > 3. Bug fixing
> > 4. Performance tuning
> > 6. support LLVM 3.6 pre-release branch fix all the issues.
> >
> > Currently, the 6th item will have lower priority than others. Once we
> > get the official LLVM 3.6 released, we will raise its priority and
> > make sure the master branch and the next beignet release support the latest
> official LLVM version.
> > This style will minimum the effort of catching up LLVM version change.
> > Considering LLVM 3.6 will be officially released at 21 February. As we
> > will have Chinese New Year vacation then, we will provide LLVM 3.6
> > support in the middle of March.
> >
> > But I think things will become better in the near future once we have
> > all platforms enabled and we have less bugs then :) or we can get more
> > support from the community.
> >
> > Then we can fully follow your suggestion to catch up the LLVM stable
> > branch not just the released version. Hope we can switch to that style
> > for next LLVM major release.
> >
> > Thanks,
> > Zhigang Gong.
> >
> Hi,
> 
> We need to spend quite some time for QA testing and performance evaluation
> for every upgrade with a new llvm version to make sure Beignet release has the
> quality and performance we expected.
> 
> To support 2 or 3 version of llvm at the same time will add a lot of additional
> testing effort for us.
> 
> So I prefer to track the llvm stable branch instead of llvm releases at this point.
> 
> Thanks
> Zou Nanhai
> 
Sorry,
	 I mean I prefer to track llvm release instead of stable branch.

Thanks
Zou Nanhai
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