diff options
Diffstat (limited to 'libc/include/sys/cdefs.h')
| -rw-r--r-- | libc/include/sys/cdefs.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h index c333823..79d8bca 100644 --- a/libc/include/sys/cdefs.h +++ b/libc/include/sys/cdefs.h @@ -355,9 +355,23 @@ #define __RCSID(_s) /* nothing */ #define __SCCSID(_s) /* nothing */ +/* + * _BSD_SOURCE and _GNU_SOURCE are expected to be defined by callers before + * any standard header file is included. In those header files we test + * against __USE_BSD and __USE_GNU. glibc does this in <features.h> but we + * do it in <sys/cdefs.h> instead because that's where our existing + * _POSIX_C_SOURCE tests were, and we're already confident that <sys/cdefs.h> + * is included everywhere it should be. + */ +#if defined(_BSD_SOURCE) +# define __USE_BSD 1 +#endif + +#if defined(_GNU_SOURCE) +# define __USE_GNU 1 +#endif + /*- - * The following definitions are an extension of the behavior originally - * implemented in <sys/_posix.h>, but with a different level of granularity. * POSIX.1 requires that the macros we test be defined before any standard * header file is included. * |