[llvm-dev] Best practices for rebasing nascent backend?

[Neil Nelson via llvm-dev]

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