diff options
Diffstat (limited to 'gcc/system.h')
| -rw-r--r-- | gcc/system.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/system.h b/gcc/system.h index b96205b..46da381 100644 --- a/gcc/system.h +++ b/gcc/system.h @@ -766,4 +766,18 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN; #endif /* GCC >= 3.0 */ +/* This macro allows casting away const-ness to pass -Wcast-qual + warnings. DO NOT USE THIS UNLESS YOU REALLY HAVE TO! It should + only be used in certain specific cases. One valid case is where + the C standard definitions or prototypes force you to. E.g. if you + need to free a const object, or if you pass a const string to + execv, et al. Another valid use would be in an allocation function + that creates const objects that need to be initialized. Most other + cases should be viewed with extreme caution. */ +#ifdef __GNUC__ +#define CONST_CAST(X) ((__extension__(union {__typeof(X)_q; void *_v;})(X))._v) +#else +#define CONST_CAST(X) ((void*)(X)) +#endif + #endif /* ! GCC_SYSTEM_H */ |