Fix compilation on MinGW with native threads

googletest/test/gtest-port_test.cc

@@ -1295,9 +1295,16 @@ TEST(WindowsTypesTest, HANDLEIsVoidStar) {
   StaticAssertTypeEq<HANDLE, void*>();
 }
 
+#if GTEST_OS_WINDOWS_MINGW
+TEST(WindowsTypesTest, _CRITICAL_SECTIONIs_CRITICAL_SECTION) {
+  StaticAssertTypeEq<CRITICAL_SECTION, _CRITICAL_SECTION>();
+}
+#else
 TEST(WindowsTypesTest, CRITICAL_SECTIONIs_RTL_CRITICAL_SECTION) {
   StaticAssertTypeEq<CRITICAL_SECTION, _RTL_CRITICAL_SECTION>();
 }
+#endif
+
 #endif  // GTEST_OS_WINDOWS
 
 }  // namespace internal

googletest/test/gtest_unittest.cc

@@ -442,7 +442,7 @@ class FormatEpochTimeInMillisAsIso8601Test : public Test {
     // tzset() distinguishes between the TZ variable being present and empty
     // and not being present, so we have to consider the case of time_zone
     // being NULL.
-#if _MSC_VER
+#if _MSC_VER || GTEST_OS_WINDOWS_MINGW
     // ...Unless it's MSVC, whose standard library's _putenv doesn't
     // distinguish between an empty and a missing variable.
     const std::string env_var =