| #ifndef FIO_COMPILER_H |
| #define FIO_COMPILER_H |
| |
| #if __GNUC__ >= 4 |
| #include "compiler-gcc4.h" |
| #elif __GNUC__ == 3 |
| #include "compiler-gcc3.h" |
| #else |
| #error Compiler too old, need gcc at least gcc 3.x |
| #endif |
| |
| #ifndef __must_check |
| #define __must_check |
| #endif |
| |
| /* |
| * Mark unused variables passed to ops functions as unused, to silence gcc |
| */ |
| #define fio_unused __attribute__((__unused__)) |
| #define fio_init __attribute__((constructor)) |
| #define fio_exit __attribute__((destructor)) |
| |
| #define fio_unlikely(x) __builtin_expect(!!(x), 0) |
| |
| /* |
| * Check at compile time that something is of a particular type. |
| * Always evaluates to 1 so you may use it easily in comparisons. |
| */ |
| #define typecheck(type,x) \ |
| ({ type __dummy; \ |
| typeof(x) __dummy2; \ |
| (void)(&__dummy == &__dummy2); \ |
| 1; \ |
| }) |
| |
| #ifndef __compiletime_error |
| #define __compiletime_error(message) |
| #endif |
| #ifndef __compiletime_error_fallback |
| #define __compiletime_error_fallback(condition) do { } while (0) |
| #endif |
| |
| #define __compiletime_assert(condition, msg, prefix, suffix) \ |
| do { \ |
| int __cond = !(condition); \ |
| extern void prefix ## suffix(void) __compiletime_error(msg); \ |
| if (__cond) \ |
| prefix ## suffix(); \ |
| __compiletime_error_fallback(__cond); \ |
| } while (0) |
| |
| #define _compiletime_assert(condition, msg, prefix, suffix) \ |
| __compiletime_assert(condition, msg, prefix, suffix) |
| |
| #define compiletime_assert(condition, msg) \ |
| _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) |
| |
| #endif |