Another RFC: regex in libiberty

Eli Zaretskii
Fri Jun 8 10:31:00 GMT 2001

> Date: Fri, 8 Jun 2001 10:05:32 -0700
> From: "H . J . Lu" <>
> 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.

Sed does have such an option (I used it to build the binary with
Spencer's regex which is the standard regex included in the DJGPP

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