test/Interpreter/Inputs/availability_host_os.h

 __attribute__((availability(macosx,introduced=10.9)))
static inline int mavericks() { return 9; }
 __attribute__((availability(macosx,introduced=10.10)))
static inline int yosemite() { return 10; }
 __attribute__((availability(macosx,introduced=10.99)))
static inline int todosSantos() { return 99; }