feat(newlib): Add macro ESP8266_TIME_SYSCALL_USE_FRC1 to enable clock_gettime function

components/esp8266/Kconfig

@@ -321,6 +321,24 @@ config ESP_ERR_TO_NAME_LOOKUP
         order to save memory but this comes at the price of sacrificing
         distinguishable (meaningful) output string representations.
 
+    choice ESP8266_TIME_SYSCALL
+        prompt "Timers used for gettimeofday function"
+        default ESP8266_TIME_SYSCALL_USE_FRC1
+        help
+            This setting defines which hardware timers are used to
+            implement 'gettimeofday' and 'time' functions in C library.
+
+            - If high-resolution timer is used, gettimeofday will
+              provide time at microsecond resolution.
+              Time will not be preserved when going into deep sleep mode.
+            - If no timers are used, gettimeofday and time functions
+              return -1 and set errno to ENOSYS.
+
+        config ESP8266_TIME_SYSCALL_USE_FRC1
+            bool "High-resolution timer"
+        config ESP8266_TIME_SYSCALL_USE_NONE
+            bool "None"
+    endchoice
 endmenu
 
 menu Wi-Fi

components/newlib/newlib/port/time.c

@@ -14,6 +14,7 @@
 
 #include <stdint.h>
 #include <reent.h>
+#include <time.h>
 #include <sys/times.h>
 #include <sys/time.h>
 #include <sys/errno.h>
@@ -26,6 +27,12 @@
 #include "task.h"
 #include "driver/soc.h"
 
+#include "sdkconfig.h"
+
+#ifdef CONFIG_ESP8266_TIME_SYSCALL_USE_FRC1
+#define WITH_FRC 1
+#endif
+
 static uint64_t s_boot_time;
 
 static inline void set_boot_time(uint64_t time_us)