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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 */ |