GNU bug report logs - #3441
23.0.94; *compilation* long lines painfully slow

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From: joakim <at> verona.se
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: "Marshall\, Simon" <Simon.Marshall <at> misys.com>,
        3441 <at> debbugs.gnu.org, Alex Ott <alexott <at> gmail.com>
Subject: bug#3441: 23.0.94; *compilation* long lines painfully slow
Date: Thu, 18 Jun 2009 09:44:40 +0200

Chong Yidong <cyd <at> stupidchicken.com> writes:

>> Create a Makefile with the contents:
>>
>> all:
>> 	@echo [insert 5000 chars]
>>
>> Run emacs -Q and do Tools > Compile... RET and I see Emacs create the
>> *compilation* window and insert chunks of the echo output.  23.0.94
>> takes 20+ seconds to complete it and is pretty much unusable during that
>> time.  22.3 takes 1 second.  Looking back at earlier pretests, this also
>> applies to 23.0.91.
>
> This is due to the following in compilation-error-regexp-alist-alist:
>
>   (maven
>    ;; Maven is a popular build tool for Java.  Maven is Free Software.
>    "\\(.*?\\):\\[\\([0-9]+\\),\\([0-9]+\\)\\]" 1 2 3)
>
> which was added here:
>
> 2007-07-25  Joakim Verona  <joakim <at> verona.se>  (tiny change)
>
> 	* progmodes/compile.el (compilation-error-regexp-alist-alist):
> 	Add support for the Maden build tool.
>
> This regexp is pathologically slow on long lines.  Since the performance
> impact is quite serious, and this bug has affected more than one user, I
> went ahead and commented out this line in compile.el.
>
> Joakim, could try to come up with a faster regexp?

Ok, I will give it a shot.

-- 
Joakim Verona

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