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From: Konstantin Kharlamov <Hi-Angel@yandex.ru>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 69290@debbugs.gnu.org
Subject: bug#69290: declare-function doesn't work when combined with --eval and -batch
Date: Tue, 20 Feb 2024 23:31:53 +0300	[thread overview]
Message-ID: <c77057ced619e6e711f9d4b3d707f3f230767e21.camel@yandex.ru> (raw)
In-Reply-To: <865xyiopkn.fsf@gnu.org>

On Tue, 2024-02-20 at 22:20 +0200, Eli Zaretskii wrote:
> > From: Konstantin Kharlamov <Hi-Angel@yandex.ru>
> > Cc: 69290@debbugs.gnu.org
> > Date: Tue, 20 Feb 2024 23:13:27 +0300
> > 
> > > Does --eval '(declare-function hello nil)' tell anything to the
> > > byte-compiler?
> > 
> > Well, I can guess by the way you're asking that the answer is "no",
> > but
> > I have no idea why so. It should.
> 
> How can it?  The declare-function form is evaluated by the startup
> code, and only after that the byte-compiler is invoked to compile
> test.el.  At least this is my analysis of what happens here.
> 
> > It is the same as if you pop up Emacs, evaluate a (defun hello())
> > and then call `byte-compile-file` over the `test.el`. There won't
> > be
> > a warning, despite that `(defun hello ())` was never byte-compiled
> > (AFAIK Emacs does note byte-compile evaluated code).
> 
> For the declare-function form to take effect, the byte-compiler needs
> to evaluate the form.  By contrast, defun is evaluated by the Lisp
> interpreter and the result is stored in the global state.

Oh, thank you for explanation, I see. It's doesn't seem to be obvious
to a bystander, because from the side it seems like in Emacs byte-
compiler and interpreter should work in a tandem, as in the example
with evaluating (defun hello()). In Emacs context the doc-string that
says `Tell the byte-compiler that function FN is defined` would read to
me as "modify global state, which later will be read by byte-compiler
to deem FN as defined". IOW, to me as a bystander the documentation
string does not explain the difference, which is why we just had this
somewhat long discussion before I understood why `declare-function`
works this way.

I guess the bug can be closed, sorry for the noise.





  reply	other threads:[~2024-02-20 20:31 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-20 18:59 bug#69290: declare-function doesn't work when combined with --eval and -batch Konstantin Kharlamov
2024-02-20 19:51 ` Eli Zaretskii
2024-02-20 19:56   ` Konstantin Kharlamov
2024-02-20 20:03     ` Eli Zaretskii
2024-02-20 20:13       ` Konstantin Kharlamov
2024-02-20 20:20         ` Eli Zaretskii
2024-02-20 20:31           ` Konstantin Kharlamov [this message]
2024-02-20 21:28             ` Konstantin Kharlamov
2024-02-21  3:30               ` Eli Zaretskii

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