| Michal Marek | 2a11c8e | 2011-07-20 17:38:57 +0200 | [diff] [blame] | 1 | #ifndef __LINUX_KCONFIG_H |
| 2 | #define __LINUX_KCONFIG_H |
| 3 | |
| 4 | #include <generated/autoconf.h> |
| 5 | |
| Masahiro Yamada | 5e8754f | 2016-06-14 14:58:57 +0900 | [diff] [blame] | 6 | #define __ARG_PLACEHOLDER_1 0, |
| 7 | #define __take_second_arg(__ignored, val, ...) val |
| 8 | |
| 9 | /* |
| 10 | * The use of "&&" / "||" is limited in certain expressions. |
| Masahiro Yamada | 4091fb9 | 2017-02-27 14:29:56 -0800 | [diff] [blame] | 11 | * The following enable to calculate "and" / "or" with macro expansion only. |
| Masahiro Yamada | 5e8754f | 2016-06-14 14:58:57 +0900 | [diff] [blame] | 12 | */ |
| 13 | #define __and(x, y) ___and(x, y) |
| 14 | #define ___and(x, y) ____and(__ARG_PLACEHOLDER_##x, y) |
| 15 | #define ____and(arg1_or_junk, y) __take_second_arg(arg1_or_junk y, 0) |
| 16 | |
| 17 | #define __or(x, y) ___or(x, y) |
| 18 | #define ___or(x, y) ____or(__ARG_PLACEHOLDER_##x, y) |
| 19 | #define ____or(arg1_or_junk, y) __take_second_arg(arg1_or_junk 1, y) |
| 20 | |
| Michal Marek | 2a11c8e | 2011-07-20 17:38:57 +0200 | [diff] [blame] | 21 | /* |
| Paul Gortmaker | 69349c2 | 2012-04-12 19:46:32 -0400 | [diff] [blame] | 22 | * Helper macros to use CONFIG_ options in C/CPP expressions. Note that |
| Michal Marek | 2a11c8e | 2011-07-20 17:38:57 +0200 | [diff] [blame] | 23 | * these only work with boolean and tristate options. |
| 24 | */ |
| 25 | |
| 26 | /* |
| Paul Gortmaker | 69349c2 | 2012-04-12 19:46:32 -0400 | [diff] [blame] | 27 | * Getting something that works in C and CPP for an arg that may or may |
| 28 | * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" |
| 29 | * we match on the placeholder define, insert the "0," for arg1 and generate |
| 30 | * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). |
| 31 | * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when |
| 32 | * the last step cherry picks the 2nd arg, we get a zero. |
| 33 | */ |
| Masahiro Yamada | 4f92084 | 2016-06-14 14:58:54 +0900 | [diff] [blame] | 34 | #define __is_defined(x) ___is_defined(x) |
| 35 | #define ___is_defined(val) ____is_defined(__ARG_PLACEHOLDER_##val) |
| 36 | #define ____is_defined(arg1_or_junk) __take_second_arg(arg1_or_junk 1, 0) |
| Paul Gortmaker | 69349c2 | 2012-04-12 19:46:32 -0400 | [diff] [blame] | 37 | |
| 38 | /* |
| Michal Marek | 2a11c8e | 2011-07-20 17:38:57 +0200 | [diff] [blame] | 39 | * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0 |
| 40 | * otherwise. For boolean options, this is equivalent to |
| 41 | * IS_ENABLED(CONFIG_FOO). |
| 42 | */ |
| Masahiro Yamada | c0a0aba | 2016-10-27 17:46:38 -0700 | [diff] [blame] | 43 | #define IS_BUILTIN(option) __is_defined(option) |
| Michal Marek | 2a11c8e | 2011-07-20 17:38:57 +0200 | [diff] [blame] | 44 | |
| 45 | /* |
| 46 | * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 |
| 47 | * otherwise. |
| 48 | */ |
| Masahiro Yamada | c0a0aba | 2016-10-27 17:46:38 -0700 | [diff] [blame] | 49 | #define IS_MODULE(option) __is_defined(option##_MODULE) |
| Michal Marek | 2a11c8e | 2011-07-20 17:38:57 +0200 | [diff] [blame] | 50 | |
| Arnd Bergmann | 9b17452 | 2015-02-18 14:12:42 -0300 | [diff] [blame] | 51 | /* |
| 52 | * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled |
| 53 | * code can call a function defined in code compiled based on CONFIG_FOO. |
| 54 | * This is similar to IS_ENABLED(), but returns false when invoked from |
| 55 | * built-in code when CONFIG_FOO is set to 'm'. |
| 56 | */ |
| Masahiro Yamada | 5e8754f | 2016-06-14 14:58:57 +0900 | [diff] [blame] | 57 | #define IS_REACHABLE(option) __or(IS_BUILTIN(option), \ |
| 58 | __and(IS_MODULE(option), __is_defined(MODULE))) |
| Arnd Bergmann | 9b17452 | 2015-02-18 14:12:42 -0300 | [diff] [blame] | 59 | |
| Mauro Carvalho Chehab | 64131a8 | 2015-04-21 06:33:03 -0300 | [diff] [blame] | 60 | /* |
| Michal Simek | 02d699f | 2015-04-16 12:48:38 -0700 | [diff] [blame] | 61 | * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', |
| 62 | * 0 otherwise. |
| 63 | */ |
| Masahiro Yamada | 5e8754f | 2016-06-14 14:58:57 +0900 | [diff] [blame] | 64 | #define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option)) |
| Michal Simek | 02d699f | 2015-04-16 12:48:38 -0700 | [diff] [blame] | 65 | |
| Michal Marek | 2a11c8e | 2011-07-20 17:38:57 +0200 | [diff] [blame] | 66 | #endif /* __LINUX_KCONFIG_H */ |