[glibc] regex: copy back from Gnulib

[Paul Eggert]

On 9/24/21 7:26 AM, Carlos O'Donell wrote:

>> I posted it on libc-alpha a while ago; that's where Joseph picked it up.
>>
>> https://sourceware.org/pipermail/libc-alpha/2021-August/130571.html
> 
> This is an RFC under an unrelated subject thread.

I'm afraid I don't quite parse what you wrote. I was trying to say that 
I did post the patch for review on libc-alpha. I guess I did it the 
wrong way?


> I just spend more than a week fixing nrules==0 for fnmatch, regexp, and regcomp.
> 
> I would like to review how things are evolving there and I'd be happy to review.
> 
> I need to circle back and fix nrules==0 for both glibc and gnulib.
> 
> What I don't think we need to do is rush a merge from gnulib.

These things are rarely rushed. Fixes have sometimes languished in 
Gnulib for months or even years. I didn't mean to rush it this time 
either; I installed into Glibc only because I was asked (to fix a build 
problem) and was given the OK.

I don't know what you mean by "fix nrules==0" but would be happy to test 
any patch you write, using Gnulib's testing framework for this stuff 
(yes, we have our own :-).