GNU bug report logs - #39595
M-x compile still very line-length weak

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: bug#39595: closed (Re: #39595: M-x compile still very line-length
 weak)
Date: Mon, 17 Feb 2020 11:08:02 +0000

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Your bug report

#39595: M-x compile still very line-length weak

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 39595 <at> debbugs.gnu.org.

-- 
39595: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=39595
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Mattias Engdegård <mattiase <at> acm.org>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Cc: 39595-done <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>,
 Paul Pogonyshev <pogonyshev <at> gmail.com>
Subject: Re: #39595: M-x compile still very line-length weak
Date: Mon, 17 Feb 2020 12:07:37 +0100

16 feb. 2020 kl. 16.37 skrev 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>:

> I bet it does!
> (All I know is I just use Debian sid. So in two years...)

Very well, pushed to emacs-27.

For future work, there seem to be more opportunities for speeding up the remaining regexps. In particular:

* Try to anchor matches at bol when possible.
* Avoid infinite repetitions (of spaces, etc) when the exact amount is known.
* Reject impossible matches as early as possible.

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From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <at> gnu.org
Subject: M-x compile still very line-length weak
Date: Thu, 13 Feb 2020 13:51:57 +0800

Compare M-x compile on make aaa vs. make bbb
$ cat Makefile
aaa:; perl -we 'print " "  x 9999;' #finishes right away.
bbb:; perl -we 'print "\n" x 9999;' #takes several seconds, even on the latest hardware.

(Indeed, on even longer lines we even see both the words "exit" and "Compiling" at the same time in the modeline.)
emacs-version "26.3"

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