linux-kernel - Re: [PATCH] libertas link error due to gcc `smartness'

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Message-Id: <1191848190.2703.17.camel@localhost.localdomain>
Date:	Mon, 08 Oct 2007 08:56:30 -0400
From:	Dan Williams <dcbw@...hat.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Marcelo Tosatti <marcelo@...ck.org>, Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libertas link error due to gcc `smartness'

On Mon, 2007-10-08 at 09:43 +0200, Geert Uytterhoeven wrote:
> Some versions of gcc replace strstr() calls with a single-character `needle'
> parameter by strchr() behind our back. This causes a link error if strchr() is
> defined as an inline function in <asm/string.h> (e.g. on m68k):
> 
> | drivers/built-in.o: In function `libertas_parse_chan':
> | linux/drivers/net/wireless/libertas/debugfs.c:209: undefined reference to `strchr'
> | drivers/built-in.o: In function `libertas_parse_ssid':
> | linux/drivers/net/wireless/libertas/debugfs.c:260: undefined reference to `strchr'
> 
> Avoid this by explicitly calling strchr() instead.
> 
> Also include <linux/string.h>, because this file calls lots of str*() routines.
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Acked-by: Dan Williams <dcbw@...hat.com>

> ---
> Due to the lack of hardware, I could not test the functionality of this change.
> I was just trying to compile a kernel with a much enabled as possible.
> 
>  drivers/net/wireless/libertas/debugfs.c |    5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> --- a/drivers/net/wireless/libertas/debugfs.c
> +++ b/drivers/net/wireless/libertas/debugfs.c
> @@ -3,6 +3,7 @@
>  #include <linux/debugfs.h>
>  #include <linux/delay.h>
>  #include <linux/mm.h>
> +#include <linux/string.h>
>  #include <net/iw_handler.h>
>  
>  #include "dev.h"
> @@ -205,7 +206,7 @@ static int libertas_parse_chan(char *buf
>  	if (!start)
>  		return -EINVAL;
>  	start += 5;
> -	end = strstr(start, " ");
> +	end = strchr(start, ' ');
>  	if (!end)
>  		end = buf + count;
>  	hold = kzalloc((end - start)+1, GFP_KERNEL);
> @@ -256,7 +257,7 @@ static void libertas_parse_ssid(char *bu
>  	if (!hold)
>  		return;
>  	hold += 5;
> -	end = strstr(hold, " ");
> +	end = strchr(hold, ' ');
>  	if (!end)
>  		end = buf + count - 1;
>  
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
> -
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