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

[Yuan Fu]

> On Dec 7, 2024, at 5:47 AM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
> 
>>> 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?
> 
> Yes, `declare-function` *should* follow the same principles as `(defvar
> FOO)`, meaning that they are compiler directives not functions to
> execute.  They affect warnings only in the current lexical scope, and
> requiring a file full of `(defvar FOO)` and `declare-function` will have
> no effect at all.
> 
> [ Side note regarding this *should*: it currently doesn't work quite as
>  well as `defvar` because its effect is always file-wide, whereas it
>  should be limited to the current scope.  ]

Defining a macro that contains the declare-function forms, and calling it in 
eval-when-compile forms seem to work (see patch), WDYT? The name 
(treesit-declare-c-functions) could be better, any ideas?

Yuan

declare-function.patch
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