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Date:	Fri, 8 Jun 2001 10:05:32 -0700
From:	"H . J . Lu" <hjl AT lucon DOT org>
To:	Zack Weinberg <zackw AT stanford DOT edu>
Cc:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>, dj AT redhat DOT com, gcc AT gcc DOT gnu DOT org,
	gdb AT sources DOT redhat DOT com, binutils AT sources DOT redhat DOT com,
	cygwin AT sources DOT redhat DOT com
Subject:	Re: Another RFC: regex in libiberty
Message-ID:	<20010608100532.B5728@lucon.org>
References:	<9003-Fri08Jun2001100651+0300-eliz AT is DOT elta DOT co DOT il> <20010608095932 DOT S979 AT stanford DOT edu>
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In-Reply-To:	<20010608095932.S979@stanford.edu>; from zackw@stanford.edu on Fri, Jun 08, 2001 at 09:59:32AM -0700

On Fri, Jun 08, 2001 at 09:59:32AM -0700, Zack Weinberg wrote:
> 
> The regex.c that came with GDB 4.18, which I think is the one that got
> spread around widely, had a bug in its implementation of the POSIX
> regcomp/regexec interface, which caused a major performance hit.  That
> bug has been fixed in GNU libc for a long time.  When I replaced
> fixincludes' copy of regex.c with a more recent version from glibc,
> fixincludes was sped up by a factor of nine.  That same bug affects
> Sed 3.02 - replace the regex.c it ships with with the one from glibc
> 2.2.x and I bet you'll see better performance.
> 

I have been telling people that you should use regex.c in glibc if
all possible if you are using gnu-regex. Every package which uses
gnu-regex should have a configuration option not to use the included
gnu-regex.


H.J.

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