From: Lynn Winebarger <owinebar@gmail.com>
To: Damien Cassou <damien@cassou.me>
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel <emacs-devel@gnu.org>
Subject: Re: Using the content of a dynamic variable in a macro
Date: Sat, 25 Feb 2023 07:32:00 -0500 [thread overview]
Message-ID: <CAM=F=bCkCB32fcj5ea8EXV8w9C2C8jOitt5MvdkDwPZbi+ddWA@mail.gmail.com> (raw)
In-Reply-To: <87lekm9j2v.fsf@cassou.me>
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On Sat, Feb 25, 2023, 5:19 AM Damien Cassou <damien@cassou.me> wrote:
> Eli Zaretskii <eliz@gnu.org> writes:
> >> Why isn't the compiler aware of the foo-var variable?
> >
> > Because lexical-binding is turned on?
>
> yes it is but I miss the deep understanding to fully understand.
>
Lexical binding isn't the issue - the variable is global in scope.
The issue is that when you explicitly run the byte-compiler in batch mode,
the "defvar" expression is only compiled, not evaluated, while the defmacro
is evaluated, and the application of the macro function is evaluated during
compilation.
Hence you need "eval-when-compile" per Tomas's response.
The reason it works in interactive mode is that the defvar is evaluated,
not compiled, and the macro function is evaluated in the run-time
environment.
Lynn
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next prev parent reply other threads:[~2023-02-25 12:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-25 8:34 Using the content of a dynamic variable in a macro Damien Cassou
2023-02-25 9:38 ` Eli Zaretskii
2023-02-25 9:43 ` Damien Cassou
2023-02-25 12:32 ` Lynn Winebarger [this message]
2023-02-27 3:24 ` Richard Stallman
2023-02-27 19:05 ` Basil Contovounesios
2023-02-28 2:44 ` Lynn Winebarger
2023-02-25 9:40 ` tomas
2023-02-27 19:03 ` Basil Contovounesios
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