http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54847
--- Comment #35 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-08 16:31:11 UTC --- (In reply to comment #33) > The problem isn't finding nanosleep, it's finding what version of POSIX or > X/Open or SUS is supported, so we know what the correct feature test macros is > for nanosleep. > > Is _XOPEN_REALTIME defined? If so, to what value? > What about _XOPEN_VERSION and _POSIX_C_VERSION? > > Maybe we can find some other combination of feature test macros that indicate > the POSIX Realtime extensions (POSIX.1b) are supported. On darwin12, unistd.h shows... #define _XOPEN_VERSION 600 /* [XSI] */ #if __DARWIN_C_LEVEL >= 199506L /* This really should be XSI */ ... #define _XOPEN_REALTIME (-1) /* no q'ed signals, mq_* */ #define _XOPEN_REALTIME_THREADS (-1) /* no posix_spawn, et. al. */ ... #endif /* XSI */ #if __DARWIN_C_LEVEL >= 199506L /* Really XSI */ ... #define _SC_XOPEN_REALTIME 111 /* Issue 6 */ #define _SC_XOPEN_REALTIME_THREADS 112 /* Issue 6 */ ... #define _SC_XOPEN_VERSION 116 .... #endif /* XSI */ /* _POSIX_VERSION and _POSIX2_VERSION from sys/unistd.h */ while sys/unistd.h doesn't have _POSIX_C_VERSION but it does have #define _POSIX_VERSION 200112L #define _POSIX2_VERSION 200112L
