Re: [Caml-list] parmap package broken in opam switch 4.03.0

[Roberto Di Cosmo <roberto@dicosmo.org>]

Hi Sebastien,
   thanks for reporting this; in principle, it would be better to just open an
issue on https://github.com/rdicosmo/parmap but this seems indeed to be an issue
with 4.03, that may hit other people, so I'm following up here.

The problem is related to setcore.mli, which is just the interface for some C
code, so there is no setcore.ml, hence no setcore.cmx either; compilation of
such cases ran along just fine via ocamlbuild up to 4.02

It seems that in 4.03 one needs to add the -opaque flag when compiling
such stubs, otherwise things go astray, and it seems ocamlbuild does not
detect automatically such situations, so one needs to explicitly pass
the -opaque option when compiling setcore.mli (and only it).

If people on the list can confirm this, we'll then need to adapt parmap's
autoconf / makefile with code that spots whether we are using 4.03+.

If some kind soul wants to lend a hand, it would be much
appreciated... otherwise I'll try to do it in a moment of spare time

all the best

--
Roberto



On Tue, Apr 26, 2016 at 04:35:41PM +0200, Sébastien Hinderer wrote:
> Hi,
> 
> It seems the Setcore module is not correctly included in the parmap
> library in opam's 4.03.0 switch:
> 
> ~$ ocamlobjinfo .opam/4.03.0/lib/parmap/parmap.cmxa | grep -i setcore
>         7d7337fa605045f3c5ec064376ede776        Setcore
>         --------------------------------        Setcore
> 
> (where the first line corresponds to the Interfaces imported by the
> Parmap module and the second line to the Implementations imported by that
> same module)
> 
> Practically, when one tries to compile a program using parmap, one gets
> an error while trying to link parmap.cmxa about the Setcore symbol which
> is not found.
> 
> Sébastien.
> 
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-- 
Roberto Di Cosmo
 
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