| Patrick Georgi | c0e16e7 | 2012-05-05 15:11:22 +0200 | [diff] [blame] | 1 | #ifndef __KCONFIG_H__ |
| 2 | #define __KCONFIG_H__ |
| 3 | |
| 4 | #include <config.h> |
| 5 | |
| 6 | /* |
| 7 | * Getting something that works in C and CPP for an arg that may or may |
| 8 | * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" |
| 9 | * we match on the placeholder define, insert the "0," for arg1 and generate |
| 10 | * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). |
| 11 | * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when |
| 12 | * the last step cherry picks the 2nd arg, we get a zero. |
| 13 | */ |
| 14 | #define __ARG_PLACEHOLDER_1 0, |
| 15 | #define config_enabled(cfg) _config_enabled(cfg) |
| 16 | #define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value) |
| 17 | #define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0, 0) |
| 18 | #define ___config_enabled(__ignored, val, ...) val |
| 19 | |
| 20 | #define IS_ENABLED(option) config_enabled(option) |
| 21 | #endif |