GC_CAN_SAVE_CALL_STACKS  484 gc/include/gc.h #if defined(GC_HAVE_BUILTIN_BACKTRACE) && !defined(GC_CAN_SAVE_CALL_STACKS)
GC_CAN_SAVE_CALL_STACKS  500 gc/include/gc.h      || defined(__FreeBSD__)) & !defined(GC_CAN_SAVE_CALL_STACKS)
GC_CAN_SAVE_CALL_STACKS 2152 gc/include/private/gcconfig.h 	     && defined(GC_CAN_SAVE_CALL_STACKS)