llvm dev - Feb 2018 - Mesa 18 does not build with llvm svn

Hi there,

to get a laptop with recent AMD Vega mobile GPU (aka Raven Ridge)
running with hardware acceleration I need to build the latest mesa with
the latest llvm.

I downloaded llvm 7 from svn.

Unfortunately, when trying to build mesa 18.0.rc3 with this llvm version
the make process fails with lot of "undefined reference to
LLVMxyzblahblah" messages.

Llvm 5.x is probably not sufficient for my purpose, I need llvm => 6.

Now I wonder, in the svn llvm version is 7. But on the download web site
the latest stable version is 5.x.

Is there no stable version 6?

Thanks!

Hi Malte,

LLVM 6 has not been released yet, but is scheduled for the end of
February/beginning of March.

There are pre-releases at http://prereleases.llvm.org/6.0.0/, but no
binaries yet. I plan to release Release Candidate 2 this week, and
then we'll get binaries too.

Thanks,
Hans

On Wed, Feb 7, 2018 at 8:20 AM, Malte Gell via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Hi there,
>
> to get a laptop with recent AMD Vega mobile GPU (aka Raven Ridge)
> running with hardware acceleration I need to build the latest mesa with
> the latest llvm.
>
> I downloaded llvm 7 from svn.
>
> Unfortunately, when trying to build mesa 18.0.rc3 with this llvm version
> the make process fails with lot of "undefined reference to
> LLVMxyzblahblah" messages.
>
> Llvm 5.x is probably not sufficient for my purpose, I need llvm => 6.
>
> Now I wonder, in the svn llvm version is 7. But on the download web site
> the latest stable version is 5.x.
>
> Is there no stable version 6?
>
> Thanks!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Hi Malte,

you may have already learned this elsewhere, but the general rule is 
that LLVM is not backwards compatible, and so Mesa will only build with 
release versions of LLVM that existed when that version of Mesa was 
released.

LLVM trunk will generally only work with Mesa master.

It is unfortunately a bit of a pain during development sometimes, and I 
do wish LLVM was better at keeping old interfaces around a little bit 
longer with deprecation warnings for such use cases, but oh well.

Cheers,
Nicolai


On 07.02.2018 08:20, Malte Gell via llvm-dev wrote:
> Hi there,
> 
> to get a laptop with recent AMD Vega mobile GPU (aka Raven Ridge)
> running with hardware acceleration I need to build the latest mesa with
> the latest llvm.
> 
> I downloaded llvm 7 from svn.
> 
> Unfortunately, when trying to build mesa 18.0.rc3 with this llvm version
> the make process fails with lot of "undefined reference to
> LLVMxyzblahblah" messages.
> 
> Llvm 5.x is probably not sufficient for my purpose, I need llvm => 6.
> 
> Now I wonder, in the svn llvm version is 7. But on the download web site
> the latest stable version is 5.x.
> 
> Is there no stable version 6?
> 
> Thanks!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> 

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