Re: [Caml-list] Local switch using opam 2

[Kenichi Asai <asai@is.ocha.ac.jp>]

Dear Gabriel,

> Our short-term plan is to merge opam file in the OCaml compiler distribution so
> that "opam pin ." or "opam install ." or "opam switch create ." works as for
> any other opam packages. There is an in-progress proposal by Leo White in
> https://github.com/ocaml/ocaml/pull/2207 ; before that gets finished and
> integrated, please feel free to download the patch proposed and use it locally.

Thank you.  It worked.  For record, I write what I did:

- create a directory containing the OCaml distribution
- change it as I want
- at the top directory of the OCaml distribution,
  * place ocaml-variants.opam as found in the above pull request
  * opam switch create . --empty
  * opam install .

However, I found that this local switch is valid only in the above
directory and I cannot set it as my default OCaml compiler.

So, I looked around the .opam directory and found this low-level thing
that corresponds to what I did for opam 1.2:

cd ~/.opam/repo
rm state.cache  -- necessary to include the following new variant info
cd default/packages/ocaml-variants/
mkdir ocaml-variants.4.04.0+my-own-variant
cd ocaml-variants.4.04.0+my-own-variant

Then, I place the opam file in this directory that designates the
base OCaml compiler and the url of the patch I want to apply.  I could
find many examples of opam files under

~/.opam/repo/default-packages/ocaml-variants/*/

I then execute:

opam switch install 4.04.0+my-own-variant

and it worked as though it is one of the standard ocaml variants.

-- 
Kenichi Asai