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compcert 2.6.0 Not compatible 👼

Context

# Packages matching: installed
# Name                   # Installed # Synopsis
base-bigarray            base
base-threads             base
base-unix                base
conf-findutils           1           Virtual package relying on findutils
conf-gmp                 4           Virtual package relying on a GMP lib system installation
coq                      8.15.1      Formal proof management system
dune                     3.0.3       Fast, portable, and opinionated build system
ocaml                    4.07.1      The OCaml compiler (virtual package)
ocaml-base-compiler      4.07.1      Official release 4.07.1
ocaml-config             1           OCaml Switch Configuration
ocaml-secondary-compiler 4.08.1-1    OCaml 4.08.1 Secondary Switch Compiler
ocamlfind                1.9.1       A library manager for OCaml
ocamlfind-secondary      1.9.1       Adds support for ocaml-secondary-compiler to ocamlfind
zarith                   1.12        Implements arithmetic and logical operations over arbitrary-precision integers
# opam file:
opam-version: "2.0"
maintainer: "dev@clarus.me"
homepage: "http://compcert.inria.fr/"
dev-repo: "git+https://github.com/AbsInt/CompCert.git"
bug-reports: "https://github.com/AbsInt/CompCert/issues"
license: "INRIA Non-Commercial License Agreement"
build: [
  ["./configure" "ia32-linux" "-bindir" "%{bin}%" "-libdir" "%{lib}%/compcert"]
  [make "-j%{jobs}%"]
]
install: [
  [make "install"]
]
remove: [
  ["rm" "%{bin}%/ccomp"]
  ["rm" "-R" "%{lib}%/compcert"]
  ["rm" "%{share}%/compcert.ini"]
]
depends: [
  "ocaml"
  "coq" {>= "8.4pl4" & < "8.5~"}
  "menhir" {>= "20151110" & < "20180530"}
]
synopsis: "The CompCert C compiler"
authors: "Xavier Leroy <xavier.leroy@inria.fr>"
flags: light-uninstall
url {
  src: "https://github.com/AbsInt/CompCert/archive/v2.6.tar.gz"
  checksum: "md5=e28b613fb2c1d4ae60f03b1ce4cf9be6"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-compcert.2.6.0 coq.8.15.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.15.1).
The following dependencies couldn't be met:
  - coq-compcert -> coq < 8.5~ -> ocaml < 4.03.0
      base of this switch (use `--unlock-base' to force)
No solution found, exiting

Dry install without Coq/switch base, to test if the problem was incompatibility with the current Coq/OCaml version:

Command: opam remove -y coq; opam install -y --show-action --unlock-base coq-compcert.2.6.0
Return code: 0

Install dependencies

Command: true
Return code: 0
Duration: 0 s

Install 🚀

Command: true
Return code: 0
Duration: 0 s

Installation size

No files were installed.

Uninstall 🧹

Command: true
Return code: 0
Missing removes: none
Wrong removes: none