feat: Add ESP8266 support

* Added support for ESP8266
* Removed previous Arduino defines in favor
  of GTEST_OS_* syntax
* Improved PlatformIO library file to be more
  stable when consumed in client applications.

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

@@ -449,7 +449,7 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 // no support for it at least as recent as Froyo (2.2).
 #define GTEST_HAS_STD_WSTRING                                         \
   (!(GTEST_OS_LINUX_ANDROID || GTEST_OS_CYGWIN || GTEST_OS_SOLARIS || \
-     GTEST_OS_HAIKU))
+     GTEST_OS_HAIKU || GTEST_OS_ESP32 || GTEST_OS_ESP8266))
 
 #endif  // GTEST_HAS_STD_WSTRING
 
@@ -573,7 +573,7 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 #ifndef GTEST_HAS_STREAM_REDIRECTION
 // By default, we assume that stream redirection is supported on all
 // platforms except known mobile ones.
-# if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_PHONE || GTEST_OS_WINDOWS_RT
+# if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_PHONE || GTEST_OS_WINDOWS_RT || GTEST_OS_ESP8266
 #  define GTEST_HAS_STREAM_REDIRECTION 0
 # else
 #  define GTEST_HAS_STREAM_REDIRECTION 1
@@ -1984,6 +1984,22 @@ inline bool IsDir(const StatStruct& st) {
 }
 # endif  // GTEST_OS_WINDOWS_MOBILE
 
+#elif GTEST_OS_ESP8266
+typedef struct stat StatStruct;
+
+inline int FileNo(FILE* file) { return fileno(file); }
+inline int IsATTY(int fd) { return isatty(fd); }
+inline int Stat(const char* path, StatStruct* buf) {
+  // stat function not implemented on ESP8266
+  return 0;
+  }
+inline int StrCaseCmp(const char* s1, const char* s2) {
+  return strcasecmp(s1, s2);
+}
+inline char* StrDup(const char* src) { return strdup(src); }
+inline int RmDir(const char* dir) { return rmdir(dir); }
+inline bool IsDir(const StatStruct& st) { return S_ISDIR(st.st_mode); }
+
 #else
 
 typedef struct stat StatStruct;
@@ -2036,7 +2052,7 @@ inline int Close(int fd) { return close(fd); }
 inline const char* StrError(int errnum) { return strerror(errnum); }
 #endif
 inline const char* GetEnv(const char* name) {
-#if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_PHONE || GTEST_OS_WINDOWS_RT
+#if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_PHONE || GTEST_OS_WINDOWS_RT || GTEST_OS_ESP8266
   // We are on Windows CE, which has no environment variables.
   static_cast<void>(name);  // To prevent 'unused argument' warning.
   return nullptr;

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);
@@ -236,7 +236,7 @@ bool FilePath::DirectoryExists() const {
     result = true;
   }
 #else
-  posix::StatStruct file_stat;
+  posix::StatStruct file_stat = {};
   result = posix::Stat(path.c_str(), &file_stat) == 0 &&
       posix::IsDir(file_stat);
 #endif  // GTEST_OS_WINDOWS_MOBILE
@@ -323,6 +323,9 @@ bool FilePath::CreateFolder() const {
   delete [] unicode;
 #elif GTEST_OS_WINDOWS
   int result = _mkdir(pathname_.c_str());
+#elif GTEST_OS_ESP8266
+  // do nothing
+  int result = 0;
 #else
   int result = mkdir(pathname_.c_str(), 0777);
 #endif  // GTEST_OS_WINDOWS_MOBILE

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

@@ -30,13 +30,20 @@
 #include <cstdio>
 #include "gtest/gtest.h"
 
-#ifdef ARDUINO
+#if GTEST_OS_ESP8266 || GTEST_OS_ESP32
+# if GTEST_OS_ESP8266
+extern "C" {
+# endif
 void setup() {
   testing::InitGoogleTest();
 }
 
 void loop() { RUN_ALL_TESTS(); }
 
+# if GTEST_OS_ESP8266
+}
+# endif
+
 #else
 
 GTEST_API_ int main(int argc, char **argv) {