From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Alan Mackenzie <acm@muc.de>
Cc: 6750@debbugs.gnu.org
Subject: bug#6750: Byte compiler: spurious message "cl used at runtime"
Date: Thu, 29 Jul 2010 01:01:46 +0200 [thread overview]
Message-ID: <jwvpqy7fbzt.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <20100728181553.GC2999@muc.de> (Alan Mackenzie's message of "Wed, 28 Jul 2010 18:15:53 +0000")
> 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).
Stefan
next prev parent reply other threads:[~2010-07-28 23:01 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 [this message]
2010-07-29 19:03 ` Alan Mackenzie
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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