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Re: bug in autoconf-2.64

From: Ralf Wildenhues
Subject: Re: bug in autoconf-2.64
Date: Wed, 23 Feb 2011 22:33:45 +0100
User-agent: Mutt/1.5.20 (2010-08-04)

* 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.

> I'm starting bisect over the gnulib update in above commit now,
> which ranges from c0ebdfe226c38c72db7c1944113fd19ff534e362 to
> b86f488e783121f54dbd44e17741fa3b29e9be9b.

That converged at this gnulib commit on Debian GNU/Linux with glibc
2.11.2 installed:

commit c823199df2cc03b6bd70d0a2fef5999af82792fe
Author: Eric Blake <address@hidden>
Date:   Tue Oct 5 16:39:32 2010 -0600

    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.
    (gl_FUNC_MEMMEM): Be more pessimistic when cross-compiling.
    * m4/strcasestr.m4 (gl_FUNC_STRCASESTR_SIMPLE)
    (gl_FUNC_STRCASESTR): Likewise.
    * m4/strstr.m4 (gl_FUNC_STRSTR_SIMPLE, gl_FUNC_STRSTR): Likewise.
    * tests/test-memmem.c (main): Expose the bug.
    * tests/test-strcasestr.c (main): Likewise.
    * tests/test-strstr.c (main): Likewise.
    * tests/test-c-strcasestr.c (main): Likewise.
    * doc/glibc-functions/memmem.texi (memmem): Document the bug.
    * doc/posix-functions/strstr.texi (strstr): Likewise.
    * doc/glibc-functions/strcasestr.texi (strcasestr): Likewise.
    Reported via http://sourceware.org/bugzilla/show_bug.cgi?id=12092

This still doesn't mean that this is the buggy commit: it can still be
something else in the code, as the commit changes whether
gl_cv_func_strstr_linear is, and gl_cv_func_strstr_works_always is not
set; but it's getting late for me now.


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