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List:       busybox
Subject:    Nice kconfig hack
From:       Lauri Kasanen <curaga () operamail ! com>
Date:       2012-04-26 13:03:07
Message-ID: 1335445387.29871.140661067648073.2BE764B4 () webmail ! messagingengine ! com
[Download RAW message or body]

Hi

Linus asked for a better way to handle the kconfig values:
https://plus.google.com/102150693225130002912/posts/9gntjh57dXt

The solution is rather neat, maybe it could save generating a few
thousand included lines in busybox too:

#define is_set(macro) is_set_(macro)
#define macrotest_1 ,
#define is_set_(value) is_set__(macrotest_##value)
#define is_set__(comma) is_set___(comma 1, 0)
#define is_set___(_, v, ...) v

- Lauri

-- 
http://www.fastmail.fm - The professional email service


["test2.c" (test2.c)]

#define is_set(macro) is_set_(macro)
#define macrotest_1 ,
#define is_set_(value) is_set__(macrotest_##value)
#define is_set__(comma) is_set___(comma 1, 0)
#define is_set___(_, v, ...) v

#include <stdio.h>

#define jaa 1

int main() {

	if (is_set(jaa))
		puts("jaa set");

	if (is_set(ejaa))
		puts("ejaa set");

#if is_set(hei)
	puts("hei pp set");
#endif

	return 0;
}


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