Re: broken memchr

[Simon Josefsson]

Eric Blake <address@hidden> writes:

> According to Simon Josefsson on 5/26/2009 10:24 AM:
>> My gnulib autobuilder is a x86_64 system (running Ubuntu 8.04 LTS), so
>> if the test starts to fail, it will show up here in a few hours:
>> 
>> http://autobuild.josefsson.org/gnulib/#000-gnulib-simple-gaggia
>
> The updated test-memchr is passing on your autobuilder; which version of
> glibc do you have on that machine?

Version 2.7.  It is an Ubuntu 8.04 LTS (virtual) machine.

> We know the broken memchr on x86_64 is in 2.10 but not current glibc
> (which will become 2.11), and based on the glibc release notes, I
> don't think the bug was present in 2.9 either:
>
> | Version 2.10
> ...
> | * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for
> x86-64.
> |   Implemented by Ulrich Drepper.
>
> I guess I'd like to see a failure report for test-memchr in the wild
> before worrying about replacing that function in gnulib, although I'm
> fairly confident that we should be able to find one.  The broken alpha
> version may have been around longer, and I'm not sure whether it is fixed
> yet, but alpha seems to be a less popular architecture.

I agree it would be best to wait for a real failure report.  I wonder if
glibc 2.10 has been widely deployed?

/Simon