| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _TOOLS_CONFIG_H |
| #define _TOOLS_CONFIG_H |
| |
| /* Subset of include/linux/kconfig.h */ |
| |
| #define __ARG_PLACEHOLDER_1 0, |
| #define __take_second_arg(__ignored, val, ...) val |
| |
| /* |
| * Helper macros to use CONFIG_ options in C/CPP expressions. Note that |
| * these only work with boolean and tristate options. |
| */ |
| |
| /* |
| * Getting something that works in C and CPP for an arg that may or may |
| * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" |
| * we match on the placeholder define, insert the "0," for arg1 and generate |
| * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). |
| * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when |
| * the last step cherry picks the 2nd arg, we get a zero. |
| */ |
| #define __is_defined(x) ___is_defined(x) |
| #define ___is_defined(val) ____is_defined(__ARG_PLACEHOLDER_##val) |
| #define ____is_defined(arg1_or_junk) __take_second_arg(arg1_or_junk 1, 0) |
| |
| /* |
| * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0 |
| * otherwise. For boolean options, this is equivalent to |
| * IS_ENABLED(CONFIG_FOO). |
| */ |
| #define IS_BUILTIN(option) __is_defined(option) |
| |
| #endif /* _TOOLS_CONFIG_H */ |