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Date: Sun, 25 May 2008 00:03:04 +0300
From: Adrian Bunk <bunk@kernel.org>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Sam Ravnborg <sam@ravnborg.org>,
       linux-kbuild <linux-kbuild@vger.kernel.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Roman Zippel <zippel@linux-m68k.org>, Tom Spink <tspink@gmail.com>
Subject: Re: [RFC PATCH] kconfig: introduce KCONFIG_* symbols for .c files
Message-ID: <20080524210304.GD2308@cs181133002.pp.htv.fi>
References: <20080524192540.GA28067@uranus.ravnborg.org> <48387F0B.3020506@goop.org> <48388187.2070503@goop.org>
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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