Re: upcoming API changes for LLVM 12

Hi,

On 2020-10-16 10:22:57 -0400, Tom Lane wrote:
> Yeah.  As long as we're not breaking the ability to build against older
> LLVM, I can't see a reason not to apply and back-patch these changes.
> We usually want all supported PG versions to build against newer tool
> chains, and this seems to fall into that category.

Cool! I just ran that branch against 3.9 (the currently oldest supported
version), and that still works.


A related question is whether it'd be time to prune the oldest supported
LLVM version. 3.9.0 was released 2016-08-31 (and 3.9.1, the only point
release, was 2016-12-13). There's currently no *pressing* reason to
reduce it, but it is the cause of few #ifdefs - but more importantly it
increases the test matrix.

I'm inclined to just have a deterministic policy that we apply around
release time going forward. E.g. don't support versions that are newer
than the newest available LLVM version in the second newest
long-term-supported distribution release of RHEL, Ubuntu, Debian?

Regards,

Andres