[llvm-dev] Phabricator -> GitHub PRs?

David Blaikie via llvm-dev llvm-dev at lists.llvm.org
Tue Jan 21 10:48:17 PST 2020


On Tue, Jan 21, 2020 at 1:45 AM Christian K├╝hnel via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi folks,
>
> Another thought on the topic is tooling support and tool integration:
> There is a hughe ecosystem around Github and very little around
> Phabricator.
>
> It took me 2 days to set up build jobs for the 10.x release branch [1].
> There are nice build integrations for Github and it was smooth sailing.
> Setting up a build job for pull requests would just be a few clicks now.
>
> In contrast I've been spending weeks on setting up a proper integration of
> pre-merge tests [2] with Phabricator. And I'm far from having a proper
> solution and I know some corner cases we will never be able to solve
> properly with Phabricator. The root cause is: On Phabricator you review
> patches that might or might not be related to a git revision and the
> process for merging/landing might introduce even more changes. This is a
> fundamental problem with the data model and nothing that can be fixed
> easily.
>
> In Github pull requests there is always a git commit that you can just
> feed to the build server. And you can be sure of what really gets merged.
> You review, build and test exactly the change that gets merged afterwards.
>

How would that be true? Given that upstream keep changing during the period
of review? The commit is going to have to be rebased to head and that may
involve making changes.


> So from the build server perspective, Github is clearly the better
> solution.
>
> [1] https://buildkite.com/llvm-project/llvm-release-builds
> [2]
> https://github.com/google/llvm-premerge-checks/blob/master/docs/user_doc.md
> Best,
> Christian
>
>
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