Re: [RFC PATCH] kconfig: introduce KCONFIG_* symbols for .c files

[Adrian Bunk <bunk@kernel.org>]

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