root/tools/include/tools/config.h

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INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _TOOLS_CONFIG_H
   3 #define _TOOLS_CONFIG_H
   4 
   5 /* Subset of include/linux/kconfig.h */
   6 
   7 #define __ARG_PLACEHOLDER_1 0,
   8 #define __take_second_arg(__ignored, val, ...) val
   9 
  10 /*
  11  * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
  12  * these only work with boolean and tristate options.
  13  */
  14 
  15 /*
  16  * Getting something that works in C and CPP for an arg that may or may
  17  * not be defined is tricky.  Here, if we have "#define CONFIG_BOOGER 1"
  18  * we match on the placeholder define, insert the "0," for arg1 and generate
  19  * the triplet (0, 1, 0).  Then the last step cherry picks the 2nd arg (a one).
  20  * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
  21  * the last step cherry picks the 2nd arg, we get a zero.
  22  */
  23 #define __is_defined(x)                 ___is_defined(x)
  24 #define ___is_defined(val)              ____is_defined(__ARG_PLACEHOLDER_##val)
  25 #define ____is_defined(arg1_or_junk)    __take_second_arg(arg1_or_junk 1, 0)
  26 
  27 /*
  28  * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
  29  * otherwise. For boolean options, this is equivalent to
  30  * IS_ENABLED(CONFIG_FOO).
  31  */
  32 #define IS_BUILTIN(option) __is_defined(option)
  33 
  34 #endif /* _TOOLS_CONFIG_H */
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