From: Alan Mackenzie <acm@muc.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 6750@debbugs.gnu.org
Subject: bug#6750: Byte compiler: spurious message "cl used at runtime"
Date: Thu, 29 Jul 2010 19:03:06 +0000 [thread overview]
Message-ID: <20100729190306.GA2459@muc.de> (raw)
In-Reply-To: <jwvpqy7fbzt.fsf-monnier+emacs@gnu.org>
Hi, Stefan,
On Thu, Jul 29, 2010 at 01:01:46AM +0200, Stefan Monnier wrote:
> > In this macro declaration:
> > (defmacro c-declare-lang-variables ()
> > `(progn
> > ,@(mapcan (lambda (init)
> > `(,(if (elt init 2)
> > `(defvar ,(car init) nil ,(elt init 2))
> > `(defvar ,(car init) nil))
> > (make-variable-buffer-local ',(car init))))
> > (cdr c-lang-variable-inits))))
> > , (from cc-engine.el), the byte-compiler gives this warning:
> > "Function `mapcan' from cl package called at runtime".
> > It is clear that the mapcan, being within a ,@ construct, does its work
> > at macro-expansion time, i.e. compile time.
> > Thus the warning message is wrong. This is a bug.
> This macro will be in the .elc. This means it can be called "at run
> time" (e.g. if you do M-: (c-declare-lang-variables ...) RET).
That brought a smile to my face. It's pure sophistry. :-) With no more
creativity than you've just shown, ANY use of mapcan could be "shown" to
be "use at runtime". So why not shorten the warning message to
"Function `mapcan' from cl package was used"
? ;-)
Or, perhaps you could indulge me a little, and show an example of mapcan
(or some other cl function) which isn't "use at runtime". You know as
well as I do, that there's no rigid separation of Lisp into compilation
and running phases.
I put it to you that that error message is not, in general, helpful. I
think it should be restricted to uses of mapcan at runtime (in a defun)
or when it's in the form generated by a macro.
I'm trying to get rid of warnings messages in CC Mode.
> Stefan
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2010-07-29 19:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-28 18:15 bug#6750: Byte compiler: spurious message "cl used at runtime" Alan Mackenzie
2010-07-28 23:01 ` Stefan Monnier
2010-07-29 19:03 ` Alan Mackenzie [this message]
2010-07-29 19:51 ` Juanma Barranquero
2010-07-30 9:18 ` Stefan Monnier
2011-07-14 13:28 ` Lars Magne Ingebrigtsen
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