diff options
Diffstat (limited to 'gcc/system.h')
| -rw-r--r-- | gcc/system.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/system.h b/gcc/system.h index 51d9c995c3c..3bb61ce8490 100644 --- a/gcc/system.h +++ b/gcc/system.h @@ -576,14 +576,20 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN; #if ENABLE_ASSERT_CHECKING #define gcc_assert(EXPR) \ ((void)(!(EXPR) ? fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0 : 0)) +#elif (__GNUC__ == 4) && (__GNUC_MINOR__) && 0 +#define gcc_assert(EXPR) do { if (EXPR) __builtin_unreachable (); } while (0) #else /* Include EXPR, so that unused variable warnings do not occur. */ #define gcc_assert(EXPR) ((void)(0 && (EXPR))) #endif +#if !ENABLE_ASSERT_CHECKING && (__GNUC__ == 4) && (__GNUC_MINOR__) && 0 +#define gcc_unreachable() __builtin_unreachable () +#else /* Use gcc_unreachable() to mark unreachable locations (like an unreachable default case of a switch. Do not use gcc_assert(0). */ #define gcc_unreachable() (fancy_abort (__FILE__, __LINE__, __FUNCTION__)) +#endif /* Provide a fake boolean type. We make no attempt to use the C99 _Bool, as it may not be available in the bootstrap compiler, |