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 CONFIG(option) config_enabled(CONFIG_##option) 21 22 #endif 23