linux-kernel - Re: m68k: main.c:(.init.text+0x730): undefined reference to `strlen'

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Message-ID: <20080514160341.GH6902@cvg>
Date:	Wed, 14 May 2008 20:03:41 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Andreas Schwab <schwab@...e.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: m68k: main.c:(.init.text+0x730): undefined reference to
	`strlen'

[Adrian Bunk - Wed, May 14, 2008 at 06:56:11PM +0300]
| On Wed, May 14, 2008 at 07:48:01PM +0400, Cyrill Gorcunov wrote:
| > [Adrian Bunk - Wed, May 14, 2008 at 06:30:59PM +0300]
| > | On Wed, May 14, 2008 at 04:28:24PM +0200, Andreas Schwab wrote:
| > | > Adrian Bunk <bunk@...nel.org> writes:
| > | > 
| > | > > Or replace all the strlen stuff in include/asm-m68k/string.h with a 
| > | > 
| > | > I don't think the strlen macros has any influence in this case (it
| > | > already uses __builtin_strlen anyway).
| > | 
| > | The problem is that it sets __HAVE_ARCH_STRLEN, and therefore the 
| > | out-of-line function in lib/string.c is not built.
| > | 
| > | That breaks when gcc replaces a call to a different function with a call 
| > | to strlen().
| > | 
| > | > I'd rather guess that gcc is
| > | > expanding strncat internally to something involving strlen with
| > | > non-constant argument,
| > | 
| > | We agree on this one.
| > | 
| > | > although I cannot see how that can happen from a
| > | > quick look.
| > | 
| > | It isn't the first time we have these problems in the kernel...
| > | 
| > | > Andreas.
| > | 
| > | cu
| > | Adrian
| > 
| > Adrian, I've just sent the updated patch, and accidentally forget
| > to CC you - please take a look on http://lkml.org/lkml/2008/5/14/267
| 
| It removes the strncat() calls and should therefore remove the current 
| compile error.
| 
| But the underlying problem that actually causes the compile error is not 
| fixed and might occur again in other places (but that's nothing you 
| have to worry about).
| 
| > 		- Cyrill -
| 
| cu
| Adrian
| 
| -- 
| 
|        "Is there not promise of rain?" Ling Tan asked suddenly out
|         of the darkness. There had been need of rain for many days.
|        "Only a promise," Lao Er said.
|                                        Pearl S. Buck - Dragon Seed
| 

Yes, this problem is still here but I was really frowned 'cause
it's my patch introduced potential memory overflow :(

		- Cyrill -
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