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Re: bug in autoconf-2.64

From: Eric Blake
Subject: Re: bug in autoconf-2.64
Date: Sat, 26 Feb 2011 16:52:22 -0700
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On 02/23/2011 02:33 PM, Ralf Wildenhues wrote:
> * Ralf Wildenhues wrote on Wed, Feb 23, 2011 at 09:08:07PM CET:
>> I can confirm the issue, but my bisect ended at
>> 5e763da323f3927159b6c151f186569a9929ddbe instead.

Thankfully, 'git describe 5e763da' in m4.git states:


That is, no released version of m4 has this commit (only m4 built from
git).  Unfortunately, you resolved to gnulib commit c823199d, which is
not related to the bug uncovered this week.

>     memmem, strstr, strcasestr: fix bug with long periodic needle
>     * lib/str-two-way.h (two_way_long_needle): Avoid bug with long
>     periodic needle having false positive.
>     * m4/memmem.m4 (gl_FUNC_MEMMEM_SIMPLE): Detect bug in glibc 2.12
>     and cygwin 1.7.7.

That fixed a false negative bug in strstr (ranging from gnulib c358da1e,
2008-01-10, to c823199d, 2010-10-05).  But it didn't cover the false
positive bug (ranging from fffd5fa, 2010-06-21, to 034c875, 2011-02-25).

And that faulty commit was indeed present in 1.4.15.

I'll be releasing 1.4.16 as soon as possible now.  Thanks again for
helping me get to the bottom of this, and apologies for breaking things
there for a few months.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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