[llvm-dev] Build status expectations for experimental targets

[Matthias Braun via llvm-dev]

> On Feb 3, 2017, at 12:45 PM, Dylan McKay via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> The builder isn’t marked as experimental so I think the expectation is that people keep it green and contact the bot owner if they need help figuring out why their change makes it red. That said, it sounds a bit odd to have a non-experimental builder for an experimental backend.
> 
> I see. I had followed the generic How to add a builder <http://llvm.org/docs/HowToAddABuilder.html> docs, which doesn’t mention the concept of an experimental buildbot. I’ll send a patch to mention it.
> 
> If you want to do the same, then you’ll need to add an InformativeMailNotifier to http://llvm.org/svn/llvm-project/zorg/trunk/buildbot/osuosl/master/config/status.py <http://llvm.org/svn/llvm-project/zorg/trunk/buildbot/osuosl/master/config/status.py>.
> 
> Nice! Exactly what I was looking for.
> 
> If we would believe the AVR backend is stable enough, such that users can rely on it and such that other developers are unlikely to trigger bugs in the AVR backend, the AVR backend should most likely be promoted to a stable backend.
> 
> In general, I’ve found that almost all of the time that the AVR build breaks, it’s been something pretty small which also caused a bunch of other targets to fail also, which I suppose is a good sign. On the topic, I plan on following up on promoting the backend to stable once the current effort of enabling AVR in Rust is complete and we’ve ironed out any bugs found in usage.
> 
> As a result of this, I would also expect buildbots of the AVR backend to not send any emails to the general public, but to instead send emails to the buildbot owner and maintainer of the AVR backend.
> 
> Agree with this
> 
> +1. The silent staging buildbot is what you want I believe
> http://lists.llvm.org/pipermail/lldb-commits/Week-of-Mon-20151012/024214.html <http://lists.llvm.org/pipermail/lldb-commits/Week-of-Mon-20151012/024214.html>
> That sounds good. My plan is to make the buildbot a staging bot, and then be the sole receiver of emails from it.
> 
> If I was in this position, I’d also configure the bot to build only the AVR backend. That’s help make sure that an email does get send when a test fails in the X86 backend.
> 
> I would love to do this, but there’s a bug in the backend which causes a few of the Generic CodeGen tests to fail. To work around this, I leave X86 as the default target for now. I’m definitely planning on updating this once I’ve fixed the bug.
> 
> 

This usually happens when LLVM_DEFAULT_TARGET_TRIPLE is not explicitely set and you end up with your host machine as default while not building the x86 target. If you set LLVM_DEFAULT_TARGET_TRIPLE to some AVR ones the failure should go away (otherwise complain and file bugs).

- Matthias

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