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

[Stefan Monnier]

>>> I thought eval-when-compile is more of a “include if compiling” macro, 
>>> should’ve checked 🙂
>>>
>>> We can also go with Dmitry’s idea, and just define all the functions in
>>> treesit.el if Emacs is not built with tree-sitter. We can detect that with
>>> treesit-available-p.
>> I haven't really thought about it, so I don't have a strong opinion.
>> AFAICT your proposal should work fine even if you remove the
>> `eval-when-compile` wrappers to which I objected.  🙂
>
> It seems to me that, having taken than route, we would recommend every
>
>   (require 'treesit)
>
> to be accompanied by
>
>   (treesit-declare-c-functions)
>
> ...or the familiar declare-function list, of course.
>
> And the same would also be true for transitive dependencies (so, both
>  c-ts-common and c-ts-mode, even though otherwise the latter could drop the
> (require 'treesit) form).

Yup.  The only cleanish way to avoid having to do that (short of
a major improvement to the byte-compiler's handling of tracking when
functions are defined) is to arrange it to all those function are always
defined (and presumably signal errors when treesit is not actually
available).


        Stefan