[llvm-dev] What version comes after 3.9? (Was: [3.9 Release] Release plan and call for testers)

Michael Kuperstein via llvm-dev llvm-dev at lists.llvm.org
Tue Jun 21 11:40:48 PDT 2016

Regardless of the numbering scheme debate, this part sounds somewhat
problematic to me.

The way I understand the current IR backward compatibility guarantee is
that the major version change is a notification strategy, not a commitment
to hold the IR stable for any given amount of time. That is, it's "If we
need to change the IR, we'll bump the major version - but this may happen
on the next release". Not "The release schedule for major versions is 5
years, so if the current minor is 3.4, you have 3 more years of stable IR
to go".

This, I think, is a fairly good model. Promising IR stability N years into
the future is something we may easily come to regret.

On Tue, Jun 21, 2016 at 7:07 AM, Rafael EspĂ­ndola <llvm-dev at lists.llvm.org>

> * The bitcode compatibility promise is changed to use real time (at
> least 5 years?) instead of revision numbers.
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