| Masahiro Yamada | ed16f5a | 2014-07-30 14:08:13 +0900 | [diff] [blame] | 1 | #ifndef __LINUX_KCONFIG_H |
| 2 | #define __LINUX_KCONFIG_H |
| 3 | |
| 4 | #include <generated/autoconf.h> |
| 5 | |
| 6 | /* |
| 7 | * Helper macros to use CONFIG_ options in C/CPP expressions. Note that |
| 8 | * these only work with boolean and tristate options. |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * Getting something that works in C and CPP for an arg that may or may |
| 13 | * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" |
| 14 | * we match on the placeholder define, insert the "0," for arg1 and generate |
| 15 | * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). |
| 16 | * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when |
| 17 | * the last step cherry picks the 2nd arg, we get a zero. |
| 18 | */ |
| 19 | #define __ARG_PLACEHOLDER_1 0, |
| 20 | #define config_enabled(cfg) _config_enabled(cfg) |
| 21 | #define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value) |
| 22 | #define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0) |
| 23 | #define ___config_enabled(__ignored, val, ...) val |
| 24 | |
| 25 | /* |
| 26 | * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', |
| 27 | * 0 otherwise. |
| 28 | * |
| 29 | */ |
| 30 | #define IS_ENABLED(option) \ |
| 31 | (config_enabled(option) || config_enabled(option##_MODULE)) |
| 32 | |
| 33 | /* |
| 34 | * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0 |
| 35 | * otherwise. For boolean options, this is equivalent to |
| 36 | * IS_ENABLED(CONFIG_FOO). |
| 37 | */ |
| 38 | #define IS_BUILTIN(option) config_enabled(option) |
| 39 | |
| 40 | /* |
| 41 | * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 |
| 42 | * otherwise. |
| 43 | */ |
| 44 | #define IS_MODULE(option) config_enabled(option##_MODULE) |
| 45 | |
| 46 | #endif /* __LINUX_KCONFIG_H */ |