Re: native-comp-async-report-warnings-errors default value

[Dmitry Gutov]

On 25.12.2021 13:53, Andrea Corallo wrote:
> Dmitry Gutov <dgutov@yandex.ru> writes:
>
> > Hi Andrea,
> >
> > On 24.12.2021 12:53, Andrea Corallo wrote:
> > > this is not a trivial modification so I might easily miss some aspects
> > > of it but...
> > > Certanly bytecode ATM has no way to store declaration specifiers and
> > > these are used for native compilation.  I guess we should at least
> > > extend this first.
> >
> > Thanks for the answer, I really wanted at least a high-level
> > understanding of this point. I wouldn't presume to ask you to work on
> > this, but maybe some of the others here who also complained about the
> > warnings, would be interested in taking the initiative?
> >
> > Regarding declaration specifiers, I think the new (declare (modes
> > ...)) feature had the same problem.
> >
> > Not sure how it was solved (or whether it was solved at all).
>
> I guess the mode declaration has affect during byte compilation so it
> should be fine.  The issue is for other declarations that are taking
> effect afterwards in the native compilation pipeline.

It has an effect at runtime: Emacs needs to look up those properties 
after the byte code is evaluated. That's why .elc files have additional 
forms added which basically call 'function-put' (as set up in 
defun-declarations-alist).

But...

> As the bytecompiler pipeline was always assumed to be the only and last
> compilation step, bytecode is ATM not designed to retain these
> information.  I'm sure it's extensible somehow but we probably need some
> advise on what's the best way to approach this.

...I suppose you might want to access that information without 
evaluating said additional byte code forms either.

Or could it evaluate them anyway? If native compilation happens after 
the code is loaded, the symbols will have the necessary properties then.