From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 24449@debbugs.gnu.org
Subject: bug#24449: Emacs 25.1 RC2: Byte compiler reports error in wrong place.
Date: Fri, 16 Sep 2016 13:33:52 +0000 [thread overview]
Message-ID: <20160916133352.GC3630@acm.fritz.box> (raw)
In-Reply-To: <83wpic3rpb.fsf@gnu.org>
Hello, Eli.
On Fri, Sep 16, 2016 at 04:22:08PM +0300, Eli Zaretskii wrote:
> > Date: Fri, 16 Sep 2016 11:31:25 +0000
> > From: Alan Mackenzie <acm@muc.de>
> >
> > $ emacs -Q -batch -f batch-byte-compile cc-engine.el
> >
> > . This outputs the following warning:
> >
> > In c-forward-decl-or-cast-1:
> > cc-engine.el:8105:22:Warning: reference to free variable `eq'
> >
> > . The use of `eq' on L8105 is entirely correct. The error is at L8636,
> > where the following appears:
> >
> > (and eq context nil
> > (match-beginning 1))
> >
> > . Clearly parentheses around the `eq' form are missing.
> >
> > The compiler should have output its warning for L8636, not L8105.
> Did you look at how the byte compiler determines the line number it
> will include in the warning/error message?
I'm looking at it now, with a view to making it work.
> If you didn't, you should, because after you do, you will never again
> wonder why an incorrect line number is reported. In fact, now that I
> did look there, I'm surprised it reports a correct line number at all,
> let alone as often as it does. It's sheer luck.
This is not a Good Thing. Even its own comment describes itself as a
"gross hack". Surely we can do better?
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2016-09-16 13:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-16 11:31 bug#24449: Emacs 25.1 RC2: Byte compiler reports error in wrong place Alan Mackenzie
2016-09-16 13:22 ` Eli Zaretskii
2016-09-16 13:33 ` Alan Mackenzie [this message]
2016-09-16 15:09 ` Eli Zaretskii
2016-09-16 16:08 ` Alan Mackenzie
2016-09-16 18:34 ` Alan Mackenzie
2016-09-16 19:03 ` Eli Zaretskii
2016-09-17 8:29 ` Alan Mackenzie
2016-09-17 9:35 ` Eli Zaretskii
2016-09-17 10:06 ` Andreas Schwab
2016-09-17 12:58 ` Alan Mackenzie
2016-09-17 19:56 ` Michael Heerdegen
2016-09-17 20:46 ` Alan Mackenzie
2016-09-17 20:51 ` Michael Heerdegen
2016-09-17 20:59 ` Alan Mackenzie
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