check_symbol_exists(malloc_zone_statistics malloc/malloc.h
HAVE_MALLOC_ZONE_STATISTICS)
check_symbol_exists(pthread_mutex_lock pthread.h HAVE_PTHREAD_MUTEX_LOCK)
+check_symbol_exists(pthread_rwlock_init pthread.h HAVE_PTHREAD_RWLOCK_INIT)
+check_symbol_exists(pthread_getspecific pthread.h HAVE_PTHREAD_GETSPECIFIC)
check_symbol_exists(strtoll stdlib.h HAVE_STRTOLL)
check_symbol_exists(__GLIBC__ stdio.h LLVM_USING_GLIBC)