Check if system time.h was overrided, if so make getTime() return 0

Author: sandeepmistry

src/WiFi.cpp

@@ -17,14 +17,22 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
-#if defined(ARDUINO_ARCH_AVR) && (__AVR_LIBC_MAJOR__ < 2)
+#ifdef ARDUINO_ARCH_AVR
+#include <avr/version.h>
+#if (__AVR_LIBC_MAJOR__ < 2)
 #define WIFI_101_NO_TIME_H
 #endif
+#endif
 
 #ifndef WIFI_101_NO_TIME_H
 #include <time.h>
 #endif
 
+#if !defined(_TIME_H_) && !defined(TIME_H)
+// another library overrided the time.h header
+#define WIFI_101_NO_TIME_H
+#endif
+
 #include "WiFi101.h"
 
 extern "C" {
@@ -919,6 +927,7 @@ int WiFiClass::ping(IPAddress host, uint8_t ttl)
 uint32_t WiFiClass::getTime()
 {
 #ifdef WIFI_101_NO_TIME_H
+	#warning "No system <time.h> header included, WiFi.getTime() will always return 0"
 	return 0;
 #else
 	tstrSystemTime systemTime;