linux-kernel - Re: Linux 2.6.27.27

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Message-ID: <m3k520buh6.fsf@google.com>
Date:	Wed, 22 Jul 2009 08:36:21 -0700
From:	Ian Lance Taylor <iant@...gle.com>
To:	Krzysztof Oledzki <olel@....pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Troy Moure <twmoure@...pr.net>, Greg KH <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	lwn@....net
Subject: Re: Linux 2.6.27.27

Krzysztof Oledzki <olel@....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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