--- libcpp/macro.c.bak	2022-04-26 16:10:45.030907031 +1000
+++ libcpp/macro.c	2022-04-26 16:16:10.791129868 +1000
@@ -509,6 +509,10 @@
 		struct stat *st = _cpp_get_file_stat (file);
 		if (st)
 		  tb = localtime (&st->st_mtime);
+		if (st) {
+		    const time_t mtime = (const time_t) st->st_mtime;
+		    tb = localtime (&mtime);
+		}
 		if (tb)
 		  {
 		    char *str = asctime (tb);