linux-kernel - Re: mconf.c and bindtextdomain() -- warnings while cross-compiling on OS X

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Date:	Sun, 4 May 2008 09:33:13 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Timur Tabi <timur@...i.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: mconf.c and bindtextdomain() -- warnings while cross-compiling on OS X

On Sat, May 03, 2008 at 10:58:04PM -0500, Timur Tabi wrote:
> I'm cross-compiling the kernel on an OS X system, and when I run "make 
> menuconfig", I get this warning:
> 
>   HOSTCC  scripts/kconfig/mconf.o
> scripts/kconfig/mconf.c: In function ‘main’:
> scripts/kconfig/mconf.c:871: warning: statement with no effect
> scripts/kconfig/mconf.c:872: warning: statement with no effect
> 
> Here is the code in question:
> 
> int main(int ac, char **av)
> {
> 	int saved_x, saved_y;
> 	char *mode;
> 	int res;
> 
> 	setlocale(LC_ALL, "");
> 	bindtextdomain(PACKAGE, LOCALEDIR);  <--- line 871
> 	textdomain(PACKAGE);
> 
> I believe the warnings are from this code in lkc.h:
> 
> #ifndef KBUILD_NO_NLS
> # include <libintl.h>
> #else
> # define gettext(Msgid) ((const char *) (Msgid))
> # define textdomain(Domainname) ((const char *) (Domainname))
> # define bindtextdomain(Domainname, Dirname) ((const char *) (Dirname))
> #endif
> 
> Can someone explain to me why this macros are defined in this way? Every 
> place where textdomain() and bindtext() are used, they are used like this:
> 
> 	bindtextdomain(PACKAGE, LOCALEDIR);
> 	textdomain(PACKAGE);
> 
> In other words, the return value from these macros is never used, so the 
> warning is inevitable.
> 
> I think the code in lkc.h should be changed to:
> 
> # define textdomain(Domainname) do {} while(0)
> # define bindtextdomain(Domainname, Dirname) do {} while(0)
> 
> I can't say for certain whether this is a good idea, though, because I'm 
> not at all familiar with this code.

I have queued up following patch. It is obviously correct and builds without
warnings here. Can you give it a try on your box.

	Sam

diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 4bc68f2..1a728fc 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -11,9 +11,9 @@
 #ifndef KBUILD_NO_NLS
 # include <libintl.h>
 #else
-# define gettext(Msgid) ((const char *) (Msgid))
-# define textdomain(Domainname) ((const char *) (Domainname))
-# define bindtextdomain(Domainname, Dirname) ((const char *) (Dirname))
+static inline void const char *gettext(const char *txt) { return txt; }
+static inline void textdomain(const char *domainname) {}
+static inline void bindtextdomain(const char *name, const char *dir) {}
 #endif
 
 #ifdef __cplusplus
--
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