linux-kernel - Re: [RFC PATCH] kconfig: introduce KCONFIG

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Message-ID: <20080524210304.GD2308@cs181133002.pp.htv.fi>
Date:	Sun, 25 May 2008 00:03:04 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Tom Spink <tspink@...il.com>
Subject: Re: [RFC PATCH] kconfig: introduce KCONFIG_* symbols for .c files

On Sat, May 24, 2008 at 09:58:47PM +0100, Jeremy Fitzhardinge wrote:
> 
> Would
>
>    #define KCONFIG(x)   (CONFIG_##x - 0)
>
>    if (KCONFIG(PREEMPT)) {
>        ...
>    }
>
> work?

$ cat test.c
#define KCONFIG(x)   (CONFIG_##x - 0)

int main()
{
  if (KCONFIG(PREEMPT))
    ;

  return 0;
}
$ gcc -O2 -Wall test.c
test.c: In function ‘main’:
test.c:5: error: ‘CONFIG_PREEMPT’ undeclared (first use in this function)
test.c:5: error: (Each undeclared identifier is reported only once
test.c:5: error: for each function it appears in.)
$ gcc --version
gcc (Debian 4.3.0-5) 4.3.1 20080523 (prerelease)

>    J

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

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