src/include/kconfig.h

   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