From: Neil Jerram <neil@ossau.uklinux.net>
To: Marco Maggi <marco.maggi-ipsu@poste.it>
Cc: bug-guile@gnu.org
Subject: Re: guile-2.0.0 fails to build without threads
Date: Sat, 21 May 2011 15:29:01 +0100 [thread overview]
Message-ID: <87vcx4yvo2.fsf@neil-laptop.ossau.uklinux.net> (raw)
In-Reply-To: <87ipt4f9fu.fsf@rapitore.luna> (Marco Maggi's message of "Sat, 21 May 2011 15:51:49 +0200")
Marco Maggi <marco.maggi-ipsu@poste.it> writes:
> Someone left ACTION-IF-FALSE empty
This is fine, isn't it?
> and also left the test
> without "checking" message in this chunk of "configure.ac":
Agree that that is unhelpful.
> maybe the problem is that GCC 4.6.0 with -O3 optimises the
> program in such a way that the test is invalidated.
Could it be that it is not strictly allowed to compare two pointers that
don't point into the same object, and that GCC now enforces this?
From http://en.wikipedia.org/wiki/Pointer_%28computing%29, under "C and
C++": "Pointer arithmetic, that is, the ability to modify a pointer's
target address with arithmetic operations (as well as magnitude
comparisons), is restricted by the language standard to remain within
the bounds of a single array object (or just after it), though many
non-segmented architectures will allow for more lenient arithmetic."
Neil
next prev parent reply other threads:[~2011-05-21 14:29 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-07 14:47 guile-2.0.0 fails to build without threads Marijn
2011-04-11 16:19 ` Andy Wingo
2011-04-12 7:26 ` Marijn
2011-04-13 10:05 ` Andy Wingo
2011-04-13 13:44 ` Marijn
2011-04-13 14:09 ` Andy Wingo
2011-04-13 14:27 ` Marijn
2011-04-13 15:22 ` Andy Wingo
2011-04-14 13:25 ` Marijn
2011-04-28 11:17 ` Andy Wingo
2011-04-28 13:08 ` Ludovic Courtès
2011-04-28 13:15 ` Andy Wingo
2011-04-28 15:09 ` Ludovic Courtès
2011-05-03 14:58 ` Marijn
2011-05-04 12:19 ` Ludovic Courtès
2011-05-05 8:04 ` Marijn
2011-05-05 12:08 ` Ludovic Courtès
2011-05-05 13:59 ` Marijn
2011-05-05 14:25 ` Ludovic Courtès
2011-05-06 8:16 ` Marijn
2011-05-06 9:52 ` Ludovic Courtès
2011-05-06 12:49 ` Marijn
2011-05-10 7:43 ` Marijn
2011-05-03 14:55 ` Marijn
2011-04-12 6:49 ` Marco Maggi
2011-04-13 9:04 ` Marco Maggi
2011-04-13 11:42 ` Marco Maggi
2011-04-13 12:26 ` Andy Wingo
2011-04-13 13:56 ` Marco Maggi
2011-04-28 11:21 ` Andy Wingo
2011-05-02 6:20 ` Marco Maggi
2011-05-20 9:37 ` Andy Wingo
2011-05-20 18:41 ` Marco Maggi
2011-05-21 2:23 ` Mark H Weaver
2011-05-21 8:45 ` Andy Wingo
2011-05-21 13:51 ` Marco Maggi
2011-05-21 14:29 ` Neil Jerram [this message]
2011-06-17 10:25 ` Andy Wingo
2011-06-20 8:06 ` Andy Wingo
2011-06-22 21:39 ` Neil Jerram
2011-04-13 9:55 ` Andy Wingo
2011-04-13 14:19 ` Marco Maggi
2011-04-13 21:57 ` Ludovic Courtès
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