linux-kernel - Re: include/linux/dynamic_debug.h:111:2: error: implicit declaration of function ‘strstr’

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Date:	Tue, 29 May 2012 19:11:14 -0600
From:	Jim Cromie <jim.cromie@...il.com>
To:	shawn <shawnlandden@...il.com>
Cc:	Jason Baron <jbaron@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: include/linux/dynamic_debug.h:111:2: error: implicit declaration of function ‘strstr’

hi Shawn,

On Tue, May 29, 2012 at 5:31 PM, shawn <shawnlandden@...il.com> wrote:
>  SHIPPED arch/arm/boot/compressed/lib1funcs.S
> In file included from include/linux/kernel.h:23:0,
>                 from
> arch/arm/boot/compressed/../../../../lib/xz/xz_private.h:15,
>                 from
> arch/arm/boot/compressed/../../../../lib/decompress_unxz.c:145,
>                 from arch/arm/boot/compressed/decompress.c:50:
> include/linux/dynamic_debug.h: In function
> ‘ddebug_dyndbg_module_param_cb’:
> include/linux/dynamic_debug.h:111:2: error: implicit declaration of
> function ‘strstr’ [-Werror=implicit-function-declaration]
>

> git blame shows b48420c1d3019ce8d84fb8e58f4ca86b8e3655b8 as introducing
> this call
>
> --
> -Shawn Landden
>

that symbol should have been provided by line 100

     98 #else
     99
    100 #include <linux/string.h>
    101 #include <linux/errno.h>
...
    108 static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
    109                                                 const char *modname)
    110 {
    111         if (strstr(param, "dyndbg")) {


which has:

     74 #ifndef __HAVE_ARCH_STRSTR
     75 extern char * strstr(const char *, const char *);
     76 #endif



does your arch have __HAVE_ARCH_STRSTR ?
if so, is strstr exported under different conditions ??

Can you send me
arch/arm/boot/compressed/decompress.i  ?
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