[cfe-dev] New buildbot with -Werror

David Blaikie via cfe-dev cfe-dev at lists.llvm.org
Tue Mar 22 17:03:54 PDT 2016

Could we change the buildbot config to treat
warnings-as-errors-that-continue in the build step? (so we get the benefit
of further execution tests, while still sending fail-mail, etc for the

On Tue, Mar 22, 2016 at 5:00 PM, David Jones via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Greetings,
> I would like to propose adding a buildbot which builds with -Werror. The
> reason for a new buildbot in this configuration is twofold:
> 1. It helps users who track and release from ToT, because they (generally)
> seem to build with -Werror. Speaking from experience :-), new warnings tend
> to crop up in a large range of commits, and end up blocking one or more of
> these downstream users. These users also seem to span several
> organizations, which makes coordination difficult.
> 1a. The current buildbots do not build with -Werror so that they will run
> tests even if warnings are generated. It may or may not be reasonable to
> enable -Werror by default for buildbots at some point in the future, but I
> don't think it's quite reasonable to do so yet (judging based on the rate
> at which new warnings seem to get added, that would leave too many
> buildbots broken). Adding a buildbot in the -Werror configuration should
> help to inform any such future changes.
> 2. It helps users who develop without -Werror (either by conscious choice
> or by oversight). Commits which inadvertently add warnings often seem to
> get reverted; however, if a buildbot can deliver warnings quickly, the
> committer can submit a small fix right away.
> I have uploaded a diff to Phabricator, however I ask to please keep
> high-level comments on this thread:
> http://reviews.llvm.org/D18382
> This build would be owned and monitored by Google.
> If there are no strong objections in the next few days, I will go ahead
> with this plan.
> Thanks,
> dlj
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