[libc] Add _EXFUN judgement
#ifndef __RTT_LIBC_H__
#define __RTT_LIBC_H__
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
#include <sys/time.h>
+#ifndef _EXFUN
+#define _EXFUN(name, proto) name proto
+#endif
+
#define MILLISECOND_PER_SECOND 1000UL
#define MICROSECOND_PER_SECOND 1000000UL
#define NANOSECOND_PER_SECOND 1000000000UL
