On Sat, Oct 21, 2023 at 11:12 AM Andres Freund <and...@anarazel.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.mu...@gmail.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: https://www.postgresql.org/message-id/CAEepm%3D39F_B3Ou8S3OrUw%2BhJEUP3p%3DwCu0ug-TTW67qKN53g3w%40mail.gmail.com 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: https://www.postgresql.org/message-id/flat/CAF1DzPXjpPxnsgySz2Zjm8d2dx7%3DJ070C%2BMQBFh%2B9NBNcBKCAg%40mail.gmail.com
