From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
---|---|
To: | Andres Freund <andres(at)anarazel(dot)de> |
Cc: | Ronan Dunklau <ronan(dot)dunklau(at)aiven(dot)io>, Devrim Gündüz <devrim(at)gunduz(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com> |
Subject: | Re: LLVM 16 (opaque pointers) |
Date: | 2023-10-20 23:02:51 |
Message-ID: | CA+hUKGLZKP8yvnutdbofyAs4sjSaBNzQCN8vf-CM3S3da08XcQ@mail.gmail.com |
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On Sat, Oct 21, 2023 at 11:12 AM Andres Freund <andres(at)anarazel(dot)de> wrote:
> On 2023-10-21 10:48:47 +1300, Thomas Munro wrote:
> > On Thu, Oct 19, 2023 at 6:20 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> > I see that Mark has also just enabled --with-llvm on some POWER Linux
> > animals, and they have failed in various ways. The failures are
> > strangely lacking in detail. It seems we didn't have coverage before,
> > and I recall that there were definitely versions of LLVM that *didn't*
> > work for our usage in the past, which I'll need to dredge out of the
> > archives. I will try to get onto a cfarm POWER machine and see if I
> > can reproduce that, before and after these commits, and whose bug is
> > it etc.
>
> I'm quite sure that jiting did pass on ppc64 at some point.
Yeah, I remember debugging it on EDB's POWER machine. First off, we
know that LLVM < 7 doesn't work for us on POWER, because:
That was fixed:
https://github.com/llvm/llvm-project/commit/a95b0df5eddbe7fa1e9f8fe0b1ff62427e1c0318
So I think that means that we'd first have to go through those animals
and figure out which ones have older LLVM, and ignore those results --
they just can't use --with-llvm. Unfortunately there doesn't seem to
be any clue on the version from the paths used by OpenSUSE. Mark, do
you know?
> > I doubt I can get anywhere near an s390x though, and we definitely had
> > pre-existing problems on that arch.
>
> IMO an LLVM bug, rather than a postgres bug, but I guess it's all a matter of
> perspective.
> https://github.com/llvm/llvm-project/issues/53009#issuecomment-1042748553
Ah, good to know about that. But there are also reports of crashes in
released versions that manage to get passed that ABI-wobble business:
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