[llvm-dev] ORC error: No callback manager available

[David Blaikie via llvm-dev]

+Lang Hames, Lord of ORCs

On Thu, Jun 25, 2020 at 4:49 AM Greg Nancarrow via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Hi LLVM Developers,
>
> I have a query about an LLVM error message that I'm encountering and I
> hope it's appropriate to post to this mailing list about it.
>
> Postgres can be built with LLVM-based JIT support.
> I find that when running on Linux (RHEL8) on IBM Z hardware, using
> LLVM8+, I'm seeing many instances of the following LLVM error message
> appearing in the Postgres server log:
>
>     ORC error: No callback manager available for s390x-ibm-linux
>
> (strangely, it otherwise doesn't seem to be causing any problems)
>
> Looking through the LLVM source code, it appears that for the
> "systemz" architecture, there is  currently no local CCMgr
> implementation available, and this then prevents indirection support
> and COD layer support. BUT - apparently it can still function (maybe
> less efficiently?) without these?
> Is somebody able to clarify exactly what that error message means and
> what the limitations are? Is it unwise to use LLVM on architectures on
> which this error is reported?
> I looked through the LLVM V10 source code and there still seems to be
> this issue for systemz.
>
> Secondly, LLVM sends this error message to standard error. As a caller
> of the LLVM library, it would be nice to be able to redirect such
> messages from the library - is it possible?
>
> Hope you can advise,
> Greg
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