| 1 | #ifndef FIO_COMPILER_H |
| 2 | #define FIO_COMPILER_H |
| 3 | |
| 4 | #if __GNUC__ >= 4 |
| 5 | #include "compiler-gcc4.h" |
| 6 | #elif __GNUC__ == 3 |
| 7 | #include "compiler-gcc3.h" |
| 8 | #else |
| 9 | #error Compiler too old, need gcc at least gcc 3.x |
| 10 | #endif |
| 11 | |
| 12 | #ifndef __must_check |
| 13 | #define __must_check |
| 14 | #endif |
| 15 | |
| 16 | /* |
| 17 | * Mark unused variables passed to ops functions as unused, to silence gcc |
| 18 | */ |
| 19 | #define fio_unused __attribute__((__unused__)) |
| 20 | #define fio_init __attribute__((constructor)) |
| 21 | #define fio_exit __attribute__((destructor)) |
| 22 | |
| 23 | #define fio_unlikely(x) __builtin_expect(!!(x), 0) |
| 24 | |
| 25 | /* |
| 26 | * Check at compile time that something is of a particular type. |
| 27 | * Always evaluates to 1 so you may use it easily in comparisons. |
| 28 | */ |
| 29 | #define typecheck(type,x) \ |
| 30 | ({ type __dummy; \ |
| 31 | typeof(x) __dummy2; \ |
| 32 | (void)(&__dummy == &__dummy2); \ |
| 33 | 1; \ |
| 34 | }) |
| 35 | |
| 36 | #endif |