time.c: `time_t` may be unsigned on some platforms.
@@ -334,7 +334,7 @@ time_alloc_time(mrb_state *mrb, time_t sec, time_t usec, enum mrb_timezone timez
tm = (struct mrb_time *)mrb_malloc(mrb, sizeof(struct mrb_time));
tm->sec = sec;
tm->usec = usec;
- if (tm->usec < 0) {
+ if (MRB_TIME_T_UINT && tm->usec < 0) {
long sec2 = (long)NDIV(tm->usec,1000000); /* negative div */
tm->usec -= sec2 * 1000000;
tm->sec += sec2;
@@ -462,7 +462,7 @@ time_mktime(mrb_state *mrb, mrb_int ayear, mrb_int amonth, mrb_int aday,
struct tm nowtime = { 0 };
#if MRB_INT_MAX > INT_MAX
-#define OUTINT(x) (INT_MIN > (x) || (x) > INT_MAX)
+#define OUTINT(x) (((MRB_TIME_T_UINT ? 0 : INT_MIN) > (x)) || (x) > INT_MAX)
#else
#define OUTINT(x) 0
#endif
