[Mesa-stable] [PATCH] scons: update for LLVM 4.0

[Chuck Atkins]

I think what Ben is pointing out is that this patch isn't changing the
supported llvm version for Mesa, it's simply making sure that the versions
supported by the scons build are correctly in sync with what the autoconf
build already supports.

On May 6, 2017 4:31 PM, "Jose Fonseca" <jfonseca at vmware.com> wrote:

> On 06/05/17 21:23, Ben Boeckel wrote:
>
>> On Sat, May 06, 2017 at 21:08:23 +0300, Andres Gomez wrote:
>>
>>> I'm not picking this for 17.0 since the changes that need LLVM 4.0 are
>>> only getting into 17.1 and beyond, and because, IMHO, it doesn't make
>>> sense to increase the version of a dependency in a stable release.
>>>
>>> I hope that's OK with you.
>>>
>>
>> This isn't increasing the version of a dependency, it is just supporting
>> a newer version of that dependency (which is already supported in the
>> autoconf build).
>>
>> --Ben
>>
>>
> Unfortunately things often get broken with newer LLVM versions. Especially
> because LLVM does not always keep backwards compatibility. Fixing the build
> is just scratching the surface.
>
> This is why we avoid backporting support for newer LLVM versions on old
> stable branches.  Even if we crossported every little change that's
> necessary, there's not enough testing going on those branches to be sure
> things didn't go awfully wrong.
>
> This policy shouldn't be a problem in practice: if people are determined
> to use a newer LLVM, then using a newer Mesa shouldn't be particularly
> onerous.
>
> Jose
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