Re: [Xen-devel] ARM64 hardware in osstest (WAS: [PATCH 0/2] ocaml: Start on fixing brokenness when no ocamlopt)

[Julien Grall <julien.grall@xxxxxxx>]

Hi Ian,

On 30/03/17 15:40, Ian Jackson wrote:
> Hi.  Christian Lindig of Citrix has been looking into our ARM64 ocaml
> build problem.  See attached mail from him.
>
> (NB: xen-devel added to CC list.)
>
> Christian writes:
> > My short-term strategy would be to exclude the ocaml xenstored on
> > architectures that don’t support the native code OCaml
> > compiler. This does not exclude ARM64 in general because the OCaml
> > native code compiler is available for ARM64 - maybe just not on the
> > release that is being used for tests - I haven’t looked into this.
> Thanks for the investigation.
>
> Indeed, we are running our tests on Debian jessie, which has only the
> bytecode compiler for ocaml on arm64.  In the general case, until we
> get a better solution, given that some versions of some operating
> systems have only the bytecode compiler, I think would we need to
> exclude the ocaml xenstored on _operating systems_ that don't have the
> native code ocaml compiler.
This sounds a good solution for Xen 4.9.

> This ought to be done automatically by our configure script.
> Currently the configure script detects that there is "some ocaml
> support" and then tries to use the native compiler.
>
> Christian, can you advise what the correct test should be to check
> whether the native code compiler is available ?  I can then try to
> make a patch to our autoconfery, and maybe you would be able to review
> it.  Or if you prefer to make that patch I'd be happy to review it of
> course.
>
> > In the long run I would suggest to simplify the build process of the
> > OCaml part by using OCamlbuild and (possibly) Oasis which leads to a
> > much simpler specification of the build targets and would cleanly
> > support compiling for bytecode and native binaries, if this is
> > possible at all.
> That sounds nice.
>
> But I think we have probably passed the point in this Xen release
> where we want to make such a change to the build system.  I'll let
> Julien (Xen Project release manager) decide on that for sure, but I
> think this probably ought to be a post-4.9 task.
I agree here. The code freeze is at the end of the week and I would 
avoid to change the build system too much.
Cheers,

--
Julien Grall

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