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To: Krzysztof Oledzki <olel@ans.pl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Troy Moure <twmoure@szypr.net>, Greg KH <gregkh@suse.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>, stable@kernel.org,
       lwn@lwn.net
Subject: Re: Linux 2.6.27.27
References: <20090720040655.GA11940@kroah.com> <4A645A45.9060509@ans.pl>
	<20090720151008.GC10015@suse.de>
	<alpine.LFD.2.01.0907200848530.13838@localhost.localdomain>
	<alpine.LNX.1.10.0907202341580.29729@bizon.gios.gov.pl>
	<alpine.LFD.2.01.0907201504470.19335@localhost.localdomain>
	<alpine.LNX.1.10.0907210831210.29729@bizon.gios.gov.pl>
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	<alpine.LFD.2.01.0907210906400.19335@localhost.localdomain>
	<alpine.LFD.2.01.0907211133010.19335@localhost.localdomain>
	<alpine.LFD.2.00.0907212211040.4630@troy-laptop>
	<alpine.LFD.2.01.0907211726140.19335@localhost.localdomain>
	<alpine.LNX.1.10.0907221340540.26357@bizon.gios.gov.pl>
From: Ian Lance Taylor <iant@google.com>
Date: Wed, 22 Jul 2009 08:36:21 -0700
In-Reply-To: <alpine.LNX.1.10.0907221340540.26357@bizon.gios.gov.pl> (Krzysztof Oledzki's message of "Wed\, 22 Jul 2009 13\:49\:58 +0200 \(CEST\)")
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Krzysztof Oledzki <olel@ans.pl> writes:

> BTW: here is a simple testcase for this bug:
>
> --- fno-strict-overflow-fixed-bug.c ---
> #include <stdio.h>
>
> int main() {
>
>         unsigned char i;
>
>         for (i = 0; i < 128; i++)
>                 printf("loop %u\n", i);
>
>         return 0;
> }
> --- cut here ---

I can confirm that this is broken in gcc 4.2 using -fno-strict-overflow,
and works correctly in gcc 4.3 and later.  Sigh.

Ian
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