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

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Date:	Sat, 24 May 2008 22:13:50 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Adrian Bunk <bunk@...nel.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

Adrian Bunk wrote:
> 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.)
>   

You and your scientific method.

Yeah, this is one of those cases where you need cpp to rescan its input 
after pasting, and I don't think it will ever do that.

    J
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