dependency flycheck is not handled right

[jian-lin]

It looks like an optional dependency. If so, it should not be used with (require 'flycheck). Otherwise, installing it from MELPA triggers errors. Steps to reproduce:

1. emacs -Q
2. eval this

(progn
  (require 'package)
  (add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
  (package-install 'ocaml-eglot))

3. see the error in *Compile-Log* buffer

Compiling file /tmp/tmp.rRpW5PPdT2/.emacs.d/elpa/ocaml-eglot-20250309.2027/ocaml-eglot.el at Mon Mar 10 12:24:48 2025
ocaml-eglot.el:37:11: Error: Cannot open load file: No such file or directory, flycheck

One way to avoid that error is to change (require 'flycheck) to (require 'flycheck nil t).

[bbatsov]

Yeah, I can commented about this when I saw #29. Given there's an explicit config option for using it, I don't think (require 'flycheck nil t) alone is enough, as someone could select the option would without having installed it, so probably some check and things will just blow up - I personally prefer feature of function checks over conditional requires that might fail at the top-level.

[xvw]

Looking to: #33
@bbatsov You seem to think that's not enough. Is there any way you could improve? For example, exposing the flycheck option only if it's installed?
Can we merge for the time being, fixing the installation from MELPA, and find a better approach?
Thank you all for your feedback and help, it's very valuable!

[bbatsov]

Yeah, you can merge #33 - it will solve the immediate problem.

[xvw]

Thank you! I'll leave it open to come up with something more “standard”. Thank you very much for your help!