Re: OCaml 5 rebuild and i686

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On Tue, Jul 04, 2023 at 09:16:52AM -0400, Stephen Smoogen wrote:
> 
> 
> On Tue, 4 Jul 2023 at 03:39, Richard W.M. Jones <rjones@xxxxxxxxxx> wrote:
> 
>     We're planning to rebuild all the OCaml packages + dependencies with
>     the new OCaml 5 compiler (https://ocaml.org/releases/5.0.0).  This has
>     a rewritten runtime system, and Jerry James has been doing amazing
>     work rebuilding everything in a COPR and fixing lots of issues
>     (https://copr.fedorainfracloud.org/coprs/jjames/OCaml5/).
> 
>     There are however three issues with i686.  Firstly there are some
>     issues with LTO, possibly solvable.  Secondly there no native code
>     backend for i686.  It has been dropped upstream and apparently they
>     have no plans to re-add it.
> 
>     (Native code backends for s390x, riscv64 and ppc64le are also dropped
>     in 5.0, but with plans to add those back in 5.1.  They're just taking
>     their time to port these ones across to the new architecture.)
> 
> 
> 
> I am not too worried about i686, but the above seems more concerning. What
> happens with the tooling for this on these platforms? I believe that currently
> the Fedora builders for Power use Fedora as the KVM server using various virt
> tools which I believe are Ocaml based. 

Hopefully nothing!  It'll run the bytecode version which is slower,
but should otherwise work.

We could do this for i686 too, but the issue is there's *never* going
to be a fast version again for i686.

Rich.

> 
> --
> Stephen Smoogen, Red Hat Automotive
> Let us be kind to one another, for most of us are fighting a hard battle. --
> Ian MacClaren

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-- 
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