feat: Add support for ESP8266 platform

Added support for ESP8266 Arduino platform.

Refactored Arduino defines to use the GTEST_OS_* model.

googlemock/src/gmock_main.cc

@@ -32,7 +32,7 @@
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
-#ifdef ARDUINO
+#if defined GTEST_OS_ESP8266 || defined GTEST_OS_ESP32
 void setup() {
   // Since Google Mock depends on Google Test, InitGoogleMock() is
   // also responsible for initializing Google Test.  Therefore there's

googletest/include/gtest/internal/gtest-port-arch.h

@@ -102,6 +102,10 @@
 # define GTEST_OS_QNX 1
 #elif defined(__HAIKU__)
 #define GTEST_OS_HAIKU 1
+#elif defined ESP8266
+# define GTEST_OS_ESP8266 1
+#elif defined  ESP32
+# define GTEST_OS_ESP32 1
 #endif  // __CYGWIN__
 
 #endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PORT_ARCH_H_

googletest/src/gtest-filepath.cc

@@ -93,7 +93,7 @@ static bool IsPathSeparator(char c) {
 // Returns the current working directory, or "" if unsuccessful.
 FilePath FilePath::GetCurrentDir() {
 #if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_PHONE || \
-    GTEST_OS_WINDOWS_RT || ARDUINO || defined(ESP_PLATFORM)
+    GTEST_OS_WINDOWS_RT || GTEST_OS_ESP8266 || GTEST_OS_ESP32
   // These platforms do not have a current directory, so we just return
   // something reasonable.
   return FilePath(kCurrentDirectoryString);

googletest/src/gtest.cc

@@ -4508,6 +4508,7 @@ class ScopedPrematureExitFile {
   }
 
   ~ScopedPrematureExitFile() {
+    #if !defined GTEST_OS_ESP8266
     if (!premature_exit_filepath_.empty()) {
       int retval = remove(premature_exit_filepath_.c_str());
       if (retval) {
@@ -4516,6 +4517,7 @@ class ScopedPrematureExitFile {
                           << retval;
       }
     }
+    #endif
   }
 
  private:

googletest/src/gtest_main.cc

@@ -30,7 +30,7 @@
 #include <cstdio>
 #include "gtest/gtest.h"
 
-#ifdef ARDUINO
+#if defined GTEST_OS_ESP8266 || defined GTEST_OS_ESP32
 void setup() {
   testing::InitGoogleTest();
 }