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bug#6740: Spurious byte compiler warnings
From: |
Juanma Barranquero |
Subject: |
bug#6740: Spurious byte compiler warnings |
Date: |
Wed, 28 Jul 2010 00:57:04 +0200 |
On Tue, Jul 27, 2010 at 23:23, Alan Mackenzie <acm@muc.de> wrote:
> It's a bug that the error message is repeated, at the very least.
Yes, likely.
> And
> the message is most assuredly false because (featurep 'cc-fix) isn't
> always false - for example when it's run under XEmacs.
Not, in code byte-compiled for Emacs it is always false because
(featurep 'xemacs) is false. That means that optimized bytecode is not
portable to XEmacs. But I don't think it was before (for a long time).
> At the very least, emitting such arcane warnings is unhelpful. Are there
> any circumstances in which such a warning might help a hacker improve his
> code? Surely we aren't in the business of making it difficult to adapt
> code for XEmacs?
You make it appear as it if were an attempt to warn about using
XEmacs-specific code, but it is not, as Dan has pointed out. The
warning is generic, the result of
(and X (featurep 'xemacs) Y Z...) => (prog (and X) nil) => (prog X
nil) ; IIUC the comments in byte-opt.el...
from whence, "value returned from X is unused".
> I think it's clear, the only code containing (featurep 'xemacs) is
> portable code.
The code is portable. The .elc is not.
Juanma
- bug#6740: Spurious byte compiler warnings, Alan Mackenzie, 2010/07/27
- bug#6740: Spurious byte compiler warnings, Dan Nicolaescu, 2010/07/27
- bug#6740: Spurious byte compiler warnings, Alan Mackenzie, 2010/07/27
- bug#6740: Spurious byte compiler warnings,
Juanma Barranquero <=
- bug#6740: Spurious byte compiler warnings, Alan Mackenzie, 2010/07/28
- bug#6740: Spurious byte compiler warnings, Juanma Barranquero, 2010/07/28
- bug#6740: Spurious byte compiler warnings, Alan Mackenzie, 2010/07/28
- bug#6740: Spurious byte compiler warnings, Juanma Barranquero, 2010/07/28
- bug#6740: Spurious byte compiler warnings, Dan Nicolaescu, 2010/07/28
- bug#6740: Spurious byte compiler warnings, Alan Mackenzie, 2010/07/29
- bug#6740: Spurious byte compiler warnings, Juanma Barranquero, 2010/07/29
bug#6740: Spurious byte compiler warnings, Stefan Monnier, 2010/07/27