Re: Use (eval-when-compile 'treesit) to save us from writing declare-function forms

[Eli Zaretskii <eliz@gnu.org>]

> From: Yuan Fu <casouri@gmail.com>
> Date: Fri, 6 Dec 2024 17:12:38 -0800
> Cc: emacs-devel@gnu.org
> 
> 
> 
> > On Dec 4, 2024, at 11:07 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > 
> >> From: Yuan Fu <casouri@gmail.com>
> >> Date: Wed, 4 Dec 2024 22:25:33 -0800
> >> Cc: emacs-devel@gnu.org
> >> 
> >>>> If we use eval-when-compile, we don’t need to write declare-function forms in c-ts-mode.el anymore, because treesit.el has declare-function forms for all treesit.c functions.
> >>> 
> >>> That's what I don't understand: how will eval-when-compile which loads
> >>> treesit.el be different from (require 'treesit) we already have in
> >>> c-ts-mode?  Don't they both load treesit.el?
> >> 
> >> I maybe wrong here, but I thought if you don’t use eval-when-compile, simply byte-compiling c-ts-mode.el wouldn’t load treesit.el?
> > 
> > Yes, it would.  You can clearly see this in a debugger if you put a
> > breakpoint in Fload and then byte-compile c-ts-mode.el.
> 
> Does that mean declare-function forms only affect the file it’s in? Because if treesit.el has declare-function forms for all the treesit.c functions, and c-ts-mode.el requires treesit.el, why do we need to have declare-function forms in c-ts-mode.el?

Seems like that.  Stefan, am I missing something here?