diff options
Diffstat (limited to 'include/features.h')
| -rw-r--r-- | include/features.h | 40 |
1 files changed, 26 insertions, 14 deletions
diff --git a/include/features.h b/include/features.h index 221b25ffe2..9940304ccb 100644 --- a/include/features.h +++ b/include/features.h @@ -41,6 +41,8 @@ _GNU_SOURCE All of the above, plus GNU extensions. _REENTRANT Select additionally reentrant object. _THREAD_SAFE Same as _REENTRANT, often used by other systems. + _FORTIFY_SOURCE If set to numeric value > 0 additional security + measures are defined, according to level. The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__. If none of these are defined, the default is to have _SVID_SOURCE, @@ -69,6 +71,7 @@ __USE_MISC Define things common to BSD and System V Unix. __USE_GNU Define GNU extensions. __USE_REENTRANT Define reentrant/thread-safe *_r functions. + __USE_FORTIFY_LEVEL Additional security measures used, according to level. __FAVOR_BSD Favor 4.3BSD things in cases of conflict. The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are @@ -101,6 +104,7 @@ #undef __USE_MISC #undef __USE_GNU #undef __USE_REENTRANT +#undef __USE_FORTIFY_LEVEL #undef __FAVOR_BSD #undef __KERNEL_STRICT_NAMES @@ -113,6 +117,20 @@ /* Always use ISO C things. */ #define __USE_ANSI 1 +/* Convenience macros to test the versions of glibc and gcc. + Use them like this: + #if __GNUC_PREREQ (2,8) + ... code requiring gcc 2.8 or later ... + #endif + Note - they won't work for gcc1 or glibc1, since the _MINOR macros + were not defined then. */ +#if defined __GNUC__ && defined __GNUC_MINOR__ +# define __GNUC_PREREQ(maj, min) \ + ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) +#else +# define __GNUC_PREREQ(maj, min) 0 +#endif + /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ #if defined _BSD_SOURCE && \ @@ -244,6 +262,14 @@ # define __USE_REENTRANT 1 #endif +#if _FORTIFY_SOURCE > 0 && __GNUC_PREREQ (4, 1) && __OPTIMIZE__ > 0 +# if _FORTIFY_SOURCE == 1 +# define __USE_FORTIFY_LEVEL 1 +# elif _FORTIFY_SOURCE > 1 +# define __USE_FORTIFY_LEVEL 2 +# endif +#endif + /* We do support the IEC 559 math functionality, real and complex. */ #define __STDC_IEC_559__ 1 #define __STDC_IEC_559_COMPLEX__ 1 @@ -265,20 +291,6 @@ #define __GLIBC__ 2 #define __GLIBC_MINOR__ 3 -/* Convenience macros to test the versions of glibc and gcc. - Use them like this: - #if __GNUC_PREREQ (2,8) - ... code requiring gcc 2.8 or later ... - #endif - Note - they won't work for gcc1 or glibc1, since the _MINOR macros - were not defined then. */ -#if defined __GNUC__ && defined __GNUC_MINOR__ -# define __GNUC_PREREQ(maj, min) \ - ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) -#else -# define __GNUC_PREREQ(maj, min) 0 -#endif - #define __GLIBC_PREREQ(maj, min) \ ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) |