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Not aware that main is broken in many of the test suites. It will be helpful to provide the bugs you find. Or if you can provide a command sequence I can do that here on Ubuntu.

Perhaps if you give specific detail about the issues you are facing it will allow the other contributors to make suggestions.

Neil Nelson

On 3/12/21 4:50 PM, John Byrd via llvm-dev wrote:

Dear llvm,

A few of us are working on a novel LLVM backend in a separate repository, and our new branch uses a lot of the fancy new MLIR stuff. We'd like the group's opinions as to best practices for keeping in sync with llvm's main branch.

Some of us opine that we should be periodically rebasing our backend on the tip of main. This has the advantage that we benefit from new main features, but it has the disadvantage that main seems to usually be broken in many of the test suites. So it's hard to find a stable commit in main, which passes all the tests on all the buildbots, that we can rebase onto.

And some of us opine that we should be merging our work with main. This has the advantage that we never rewrite history, but it also means that it will be painful to squash or rebase our commits, if we ever decide to submit our work upstream.

We've considered doing our work based on one of the release branches, but until recently the development docs recommended against this.

Wisdom would be appreciated; thank you.

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John Byrd
Gigantic Software
2321 E 4th Street
Suite C #429
Santa Ana, CA 92705-3862
http://www.giganticsoftware.com
T: (949) 892-3526 F: (206) 309-0850
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