* Re: [Emacs-diffs] trunk r113896: Declare external variables.
[not found] <E1VA0wJ-0001uE-N7@vcs.savannah.gnu.org>
@ 2013-08-15 20:25 ` Stefan Monnier
2013-08-16 7:34 ` Michael Albinus
2013-08-15 20:32 ` Stefan Monnier
1 sibling, 1 reply; 7+ messages in thread
From: Stefan Monnier @ 2013-08-15 20:25 UTC (permalink / raw)
To: Michael Albinus; +Cc: emacs-devel
> +(eval-when-compile
> + (defvar directory-sep-char)
> + (defvar dired-move-to-filename-regexp))
You don't want to "eval" those defvars, since evaluating such a defvar is
mostly a no-op. So don't put them inside eval-when-compile.
Stefan
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [Emacs-diffs] trunk r113896: Declare external variables.
2013-08-15 20:25 ` [Emacs-diffs] trunk r113896: Declare external variables Stefan Monnier
@ 2013-08-16 7:34 ` Michael Albinus
2013-08-16 16:28 ` Stefan Monnier
2013-08-16 22:38 ` Xue Fuqiao
0 siblings, 2 replies; 7+ messages in thread
From: Michael Albinus @ 2013-08-16 7:34 UTC (permalink / raw)
To: Stefan Monnier; +Cc: emacs-devel
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> +(eval-when-compile
>> + (defvar directory-sep-char)
>> + (defvar dired-move-to-filename-regexp))
>
> You don't want to "eval" those defvars, since evaluating such a defvar is
> mostly a no-op. So don't put them inside eval-when-compile.
But it doesn't hurt, does it?
I've written it this way for didactic purposes: it reminds me what it is
good for (byte-compiler!).
> Stefan
Best regards, Michael.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Emacs-diffs] trunk r113896: Declare external variables.
2013-08-16 7:34 ` Michael Albinus
@ 2013-08-16 16:28 ` Stefan Monnier
2013-08-17 10:21 ` Michael Albinus
2013-08-16 22:38 ` Xue Fuqiao
1 sibling, 1 reply; 7+ messages in thread
From: Stefan Monnier @ 2013-08-16 16:28 UTC (permalink / raw)
To: Michael Albinus; +Cc: emacs-devel
>>> +(eval-when-compile
>>> + (defvar directory-sep-char)
>>> + (defvar dired-move-to-filename-regexp))
>> You don't want to "eval" those defvars, since evaluating such a defvar is
>> mostly a no-op. So don't put them inside eval-when-compile.
> But it doesn't hurt, does it?
Yes it does. It actually hides those defvars from the compiler since it
passes the code to `eval' and only passes the result (aka nil) to the
compiler (at least, that's what "eval-when-compile" is supposed to
mean).
It's a bad habit. The byte-compiler has to do extra work to find those
defvars because of people who write code like that.
Please fix it, so as not to set a bad example,
Stefan
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [Emacs-diffs] trunk r113896: Declare external variables.
2013-08-16 7:34 ` Michael Albinus
2013-08-16 16:28 ` Stefan Monnier
@ 2013-08-16 22:38 ` Xue Fuqiao
1 sibling, 0 replies; 7+ messages in thread
From: Xue Fuqiao @ 2013-08-16 22:38 UTC (permalink / raw)
To: Michael Albinus; +Cc: Stefan Monnier, emacs-devel
On Fri, Aug 16, 2013 at 3:34 PM, Michael Albinus <michael.albinus@gmx.de> wrote:
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>
>>> +(eval-when-compile
>>> + (defvar directory-sep-char)
>>> + (defvar dired-move-to-filename-regexp))
>>
>> You don't want to "eval" those defvars, since evaluating such a defvar is
>> mostly a no-op. So don't put them inside eval-when-compile.
> I've written it this way for didactic purposes: it reminds me what it is
> good for (byte-compiler!).
Like Stefan said, it burdens the byte-compiler. You can add some
comments before it.
--
Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Emacs-diffs] trunk r113896: Declare external variables.
[not found] <E1VA0wJ-0001uE-N7@vcs.savannah.gnu.org>
2013-08-15 20:25 ` [Emacs-diffs] trunk r113896: Declare external variables Stefan Monnier
@ 2013-08-15 20:32 ` Stefan Monnier
2013-08-16 12:46 ` Michael Albinus
1 sibling, 1 reply; 7+ messages in thread
From: Stefan Monnier @ 2013-08-15 20:32 UTC (permalink / raw)
To: Michael Albinus; +Cc: emacs-devel
> + (defvar buffer-name)
This is bad: buffer-name should not be a dynamically-scoped variable.
Stefan
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [Emacs-diffs] trunk r113896: Declare external variables.
2013-08-15 20:32 ` Stefan Monnier
@ 2013-08-16 12:46 ` Michael Albinus
0 siblings, 0 replies; 7+ messages in thread
From: Michael Albinus @ 2013-08-16 12:46 UTC (permalink / raw)
To: Stefan Monnier; +Cc: emacs-devel
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> + (defvar buffer-name)
>
> This is bad: buffer-name should not be a dynamically-scoped variable.
I don't like it either. It's old code, maybe it came in for whatever
compatibility reason. Don't remember.
Anyway, I've fixed it. It's not the most important part of Tramp, it is
the code reporting Tramp bugs.
> Stefan
Best regards, Michael.
^ permalink raw reply [flat|nested] 7+ messages in thread
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[not found] <E1VA0wJ-0001uE-N7@vcs.savannah.gnu.org>
2013-08-15 20:25 ` [Emacs-diffs] trunk r113896: Declare external variables Stefan Monnier
2013-08-16 7:34 ` Michael Albinus
2013-08-16 16:28 ` Stefan Monnier
2013-08-17 10:21 ` Michael Albinus
2013-08-16 22:38 ` Xue Fuqiao
2013-08-15 20:32 ` Stefan Monnier
2013-08-16 12:46 ` Michael Albinus
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