Adapt to https://github.com/coq/coq/pull/20027

[proux01]

Adapt to rocq-prover/rocq#20027 (part of the renaming from Coq to Rocq)

[ppedrot]

This is backwards compatible, please merge ASAP to ease the life of the Rocq 9.0. RM.

[xavierleroy]

Ça vient, ça vient :-)

[xavierleroy]

Feature wish for Rocq: a command-line option that prints the version number (and nothing else) and exit. Like in OCaml:

$ ocamlc -v
The OCaml compiler, version 4.14.2
Standard library directory: /foo/bar/lib/ocaml
$ ocamlc -version
4.14.2
$ ocamlc -where
/foo/bar/lib/ocaml

[ppedrot]

Thanks for the fast merge! Indeed, a way to access version data without ad-hoc parsing would be way more robust...

[ppedrot]

@xavierleroy good news and bad news: the good one is that there is indeed already a command to do that, it's coqc --print-version, which is present since Coq 8.6. The bad news is that this PR is already outdated because the message is bound to change again, see rocq-prover/rocq#20053. I'm writing the final patch right now, but it will need from our side a backport to the Coq 9.0 branch, so ideally it should go in asap (again but that's the last one hopefully).

[xavierleroy]

there is indeed already a command to do that, it's coqc --print-version, which is present since Coq 8.6

I could definitely use this in CompCert's configure script. The oldest supported Coq version is currently 8.13.

[ppedrot]

@xavierleroy it's already written in #544