diff options
Diffstat (limited to 'lib/cdefs.h')
| -rw-r--r-- | lib/cdefs.h | 40 |
1 files changed, 24 insertions, 16 deletions
diff --git a/lib/cdefs.h b/lib/cdefs.h index 09a3d19b23b..412f036ce35 100644 --- a/lib/cdefs.h +++ b/lib/cdefs.h @@ -140,32 +140,37 @@ #endif +/* Gnulib avoids these definitions, as they don't work on non-glibc platforms. + In particular, __bos and __bos0 are defined differently in the Android libc. + */ +#ifndef __GNULIB_CDEFS + /* Fortify support. */ -#define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) -#define __bos0(ptr) __builtin_object_size (ptr, 0) +# define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) +# define __bos0(ptr) __builtin_object_size (ptr, 0) /* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */ -#if __USE_FORTIFY_LEVEL == 3 && (__glibc_clang_prereq (9, 0) \ - || __GNUC_PREREQ (12, 0)) -# define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0) -# define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1) -#else -# define __glibc_objsize0(__o) __bos0 (__o) -# define __glibc_objsize(__o) __bos (__o) -#endif +# if __USE_FORTIFY_LEVEL == 3 && (__glibc_clang_prereq (9, 0) \ + || __GNUC_PREREQ (12, 0)) +# define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0) +# define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1) +# else +# define __glibc_objsize0(__o) __bos0 (__o) +# define __glibc_objsize(__o) __bos (__o) +# endif /* Compile time conditions to choose between the regular, _chk and _chk_warn variants. These conditions should get evaluated to constant and optimized away. */ -#define __glibc_safe_len_cond(__l, __s, __osz) ((__l) <= (__osz) / (__s)) -#define __glibc_unsigned_or_positive(__l) \ +# define __glibc_safe_len_cond(__l, __s, __osz) ((__l) <= (__osz) / (__s)) +# define __glibc_unsigned_or_positive(__l) \ ((__typeof (__l)) 0 < (__typeof (__l)) -1 \ || (__builtin_constant_p (__l) && (__l) > 0)) /* Length is known to be safe at compile time if the __L * __S <= __OBJSZ condition can be folded to a constant and if it is true, or unknown (-1) */ -#define __glibc_safe_or_unknown_len(__l, __s, __osz) \ +# define __glibc_safe_or_unknown_len(__l, __s, __osz) \ ((__osz) == (__SIZE_TYPE__) -1 \ || (__glibc_unsigned_or_positive (__l) \ && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \ @@ -175,7 +180,7 @@ /* Conversely, we know at compile time that the length is unsafe if the __L * __S <= __OBJSZ condition can be folded to a constant and if it is false. */ -#define __glibc_unsafe_len(__l, __s, __osz) \ +# define __glibc_unsafe_len(__l, __s, __osz) \ (__glibc_unsigned_or_positive (__l) \ && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \ __s, __osz)) \ @@ -184,7 +189,7 @@ /* Fortify function f. __f_alias, __f_chk and __f_chk_warn must be declared. */ -#define __glibc_fortify(f, __l, __s, __osz, ...) \ +# define __glibc_fortify(f, __l, __s, __osz, ...) \ (__glibc_safe_or_unknown_len (__l, __s, __osz) \ ? __ ## f ## _alias (__VA_ARGS__) \ : (__glibc_unsafe_len (__l, __s, __osz) \ @@ -194,13 +199,16 @@ /* Fortify function f, where object size argument passed to f is the number of elements and not total size. */ -#define __glibc_fortify_n(f, __l, __s, __osz, ...) \ +# define __glibc_fortify_n(f, __l, __s, __osz, ...) \ (__glibc_safe_or_unknown_len (__l, __s, __osz) \ ? __ ## f ## _alias (__VA_ARGS__) \ : (__glibc_unsafe_len (__l, __s, __osz) \ ? __ ## f ## _chk_warn (__VA_ARGS__, (__osz) / (__s)) \ : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s)))) \ +#endif + + #if __GNUC_PREREQ (4,3) # define __warnattr(msg) __attribute__((__warning__ (msg))) # define __errordecl(name, msg) \ |