1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _TOOLS_CONFIG_H
3 #define _TOOLS_CONFIG_H
5 /* Subset of include/linux/kconfig.h */
7 #define __ARG_PLACEHOLDER_1 0,
8 #define __take_second_arg(__ignored, val, ...) val
11 * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
12 * these only work with boolean and tristate options.
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.
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)
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).
32 #define IS_BUILTIN(option) __is_defined(option)
34 #endif /* _TOOLS_CONFIG_H */