bug#42425: 26.3.50; Compilation warnings when compiling eldoc.el under Emacs 26.3

[Lars Ingebrigtsen]

Philipp Stephani <p.stephani2@gmail.com> writes:

> eldoc is now a separate package that claims to support Emacs 26.3.
> However, compiling eldoc.el results in a few warnings:
>
> emacs -Q -batch -l bytecomp -f batch-byte-compile eldoc.el
>
> In eldoc--eval-expression-setup:
> eldoc.el:236:9:Warning: assignment to free variable
>     ‘eldoc-documentation-strategy’
>
> In eldoc--supported-p:
> eldoc.el:615:19:Warning: reference to free variable
>     ‘eldoc-documentation-strategy’
>
> In eldoc--invoke-strategy:
> eldoc.el:732:28:Warning: reference to free variable
>     ‘eldoc-documentation-strategy’
>
> In end of data:
> eldoc.el:804:1:Warning: the following functions are not known to be defined:
>     elisp-eldoc-var-docstring, elisp-eldoc-funcall
>
> 1. Probably the definition of `eldoc-documentation-strategy' needs to be
>    moved before its first use.

Doing so seems easy enough, but I'm not sure how high our ambitions are
for doing warning-free ELPA packages on older Emacs versions?  (I've
added João to the CCs.)

> 2. Probably eldoc should protect against newer Elisp functions being not
>    yet available, as calling such functions will likely result in errors
>    at runtime.

Doesn't it do that?  What functions is it using that's not available?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no