Re: [Caml-list] A way to avoid "WARNING: myocamlbuild.cmi occurs in several directories"?

[Stephen Magill <stephen.magill@gmail.com>]

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I have a similar development setup and have made effective use of ocp-build
to enable a tight development loop while still supporting opam deployment.
 Suppose you have libraries A and B and a program P that uses these, each
in their own directory (or repository).  You set these up with a
per-project .ocp file that describes the library / program sources and a
per-project Makefile.  For each project X, the Makefile (or OPAM build
rules) executes:
  ocp-build init
  ocp-build configure
  ocp-build X

This configures ocp-build to only search in that directory when doing its
build.  When doing development, you skip the per-project makefiles and
instead arrange things as:
  projects/A
  projects/B
  projects/P

And you execute the "ocp-build init; ocp-build configure" portion in the
*projects* directory.  This sets "projects" as the ocp-build root directory
and causes ocp-build to find all the per-project .ocp files.  The
dependencies between the program and libraries will be properly resolved
and even if you have A or B installed with findlib, the local versions of
the libraries will take precedence when building / linking P.  Just compile
P with "ocp-build P" (executed somewhere in the projects/ directory tree).
 You do have to be careful to ensure that during development you never
accidentally create a "projects/X/_obuild" directory (e.g. you never
accidentally invoke "make" in any of the project directories).  ocp-build
will stop at the first _obuild directory it finds, so having _obuild
directories other than projects/_obuild will prevent the full traversal of
the projects/* subdirectories.

--Stephen


On Thu, Dec 12, 2013 at 7:12 PM, Daniel Bünzli
<daniel.buenzli@erratique.ch>wrote:

>
>
> Le vendredi, 13 décembre 2013 à 00:57, Anthony Tavener a écrit :
>
> > I regularly develop libraries in parallel with application code.
>
> Since you seem to be using ocamlbuild, at a certain point I was using (and
> still use sometimes) a workflow that I described here:
>
>
> http://brion.inria.fr/gallium/index.php/Working_on_dependent_projects_with_ocamlbuild
>
> If you work with version control you could also make local git package for
> the libs. That way you can update your all your libraries after new commits
> with a single `opam update && opam upgrade`.
>
> Best,
>
> Daniel
>
>
>
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