Re: OCaml: incompatible ppx drivers (ppxlib and ocaml-migrate-parsetree)

[Julien Lepiller]

Looking at the opam repo, ppxlib 0.20.0 requires ocaml-parse-tree >= 2.1.0, 
which is the latest. You have version 1.8.0.

Le 30 décembre 2020 11:55:11 GMT-05:00, divoplade <d@divoplade.fr> a écrit :
>Dear guix,
>
>I am trying to build js-of-ocaml. I have created an updated version of
>ocaml-compiler-libs, ocaml-migrate-parsetree and ocaml-ppxlib, and
>tried to build the latest js_of_ocaml with that, but I get the
>following error when building the updated ppxlib:
>
>starting phase `build'
>File "_build/default/.ppx/0224ad3443a846e54f1637fccb074e7d/ppx.exe",
>line 1, characters 0-0:
>Error: Failed to create on-demand ppx rewriter for ppxlib.metaquot; too
>many
>incompatible ppx drivers were found: ppxlib and ocaml-migrate-
>parsetree.
>File "_build/default/.ppx/3134a5298fb2c80808cc94dd434856cb/ppx.exe",
>line 1, characters 0-0:
>Error: Failed to create on-demand ppx rewriter for ppxlib.traverse; too
>many
>incompatible ppx drivers were found: ppxlib and ocaml-migrate-
>parsetree.
>File "traverse/dune", line 7, characters 13-48:
>7 |  (preprocess (pps ppxlib_metaquot ppxlib.runner)))
>                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>Error: Too many incompatible ppx drivers were found: ppxlib and
>ocaml-migrate-parsetree.
>File "ast/ast_helper_lite.mli", line 18, characters 0-17:
>18 | open Ocaml_common
>     ^^^^^^^^^^^^^^^^^
>Error (warning 33): unused open Ocaml_common.
>command "dune" "build" "@install" failed with status 1
>builder for `/gnu/store/k7wfvxqbp07f8idjsbzi699v5y163j24-ocaml-ppxlib-
>0.20.0.drv' failed with exit code 1
>
>Why are these two packages "incompatible"? Do you understand what is
>happening?