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 */ 35