Merge 55da83185f39dd0b198e20a135eeee3b2865125e into a0f06a70e3da7afa88da9527c43951bca1f7cef2

Fixes: #2066
PiperOrigin-RevId: 955981465
Change-Id: I6b34dc2e634d4b727a50fb3e21e5d8e25c39a13b

googletest/include/gtest/gtest-printers.h

@@ -945,13 +945,13 @@ template <typename T>
 class [[nodiscard]] UniversalPrinter<std::optional<T>> {
  public:
   static void Print(const std::optional<T>& value, ::std::ostream* os) {
-    *os << '(';
     if (!value) {
-      *os << "nullopt";
+      UniversalPrint(std::nullopt, os);
     } else {
+      *os << '(';
       UniversalPrint(*value, os);
+      *os << ')';
     }
-    *os << ')';
   }
 };
 
@@ -961,27 +961,38 @@ class [[nodiscard]] UniversalPrinter<std::nullopt_t> {
   static void Print(std::nullopt_t, ::std::ostream* os) { *os << "(nullopt)"; }
 };
 
+struct UniversalPrinterVisitor {
+  template <typename T>
+  void operator()(const T& arg) const {
+    *os << "'" << GetTypeName<T>() << "(index = " << index << ")' with value ";
+    UniversalPrint(arg, os);
+  }
+  ::std::ostream* os;
+  std::size_t index;
+};
+
 // Printer for std::variant
 template <typename... T>
 class [[nodiscard]] UniversalPrinter<std::variant<T...>> {
  public:
   static void Print(const std::variant<T...>& value, ::std::ostream* os) {
-    *os << '(';
-    std::visit(Visitor{os, value.index()}, value);
-    *os << ')';
-  }
-
- private:
-  struct Visitor {
-    template <typename U>
-    void operator()(const U& u) const {
-      *os << "'" << GetTypeName<U>() << "(index = " << index
-          << ")' with value ";
-      UniversalPrint(u, os);
+    if (value.valueless_by_exception()) {
+      *os << "(valueless)";
+    } else {
+      *os << '(';
+      std::visit(UniversalPrinterVisitor{os, value.index()}, value);
+      *os << ')';
     }
-    ::std::ostream* os;
-    std::size_t index;
-  };
+  }
+};
+
+// Printer for std::monostate
+template <>
+class [[nodiscard]] UniversalPrinter<std::monostate> {
+ public:
+  static void Print(std::monostate, ::std::ostream* os) {
+    *os << "(monostate)";
+  }
 };
 
 // UniversalPrintArray(begin, len, os) prints an array of 'len'

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

@@ -84,6 +84,9 @@
 #define GTEST_OS_GNU_HURD 1
 #elif defined(__GLIBC__) && defined(__FreeBSD_kernel__)
 #define GTEST_OS_GNU_KFREEBSD 1
+#elif defined(__ZEPHYR__)
+// Define it before linux as it could be built as a linux application
+#define GTEST_OS_ZEPHYR 1
 #elif defined __linux__
 #define GTEST_OS_LINUX 1
 #if defined __ANDROID__

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

@@ -141,6 +141,7 @@
 //     GTEST_OS_WINDOWS_PHONE    - Windows Phone
 //     GTEST_OS_WINDOWS_RT       - Windows Store App/WinRT
 //   GTEST_OS_ZOS      - z/OS
+//   GTEST_OS_ZEPHYR   - Zephyr OS
 //
 // Among the platforms, Cygwin, Linux, Mac OS X, and Windows have the
 // most stable support.  Since core members of the Google Test project
@@ -516,6 +517,10 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 #endif
 #endif  // GTEST_HAS_STD_WSTRING
 
+#ifdef GTEST_OS_ZEPHYR
+#define GTEST_HAS_FILE_SYSTEM 0
+#endif
+
 #ifndef GTEST_HAS_FILE_SYSTEM
 // Most platforms support a file system.
 #define GTEST_HAS_FILE_SYSTEM 1
@@ -2063,6 +2068,18 @@ inline int RmDir(const char* dir) { return rmdir(dir); }
 inline bool IsDir(const StatStruct& st) { return S_ISDIR(st.st_mode); }
 #endif
 
+#elif defined(GTEST_OS_ZEPHYR)
+static inline int FileNo(FILE* file) {
+  if (file == stdin)
+    return 1;
+  else if (file == stdout)
+    return 2;
+  else if (file == stderr)
+    return 3;
+  return -EINVAL;
+}
+
+static inline int isatty(int fd) { return true; }
 #else
 
 typedef struct stat StatStruct;

googletest/src/gtest.cc

@@ -43,7 +43,9 @@
 #include <algorithm>
 #include <chrono>  // NOLINT
 #include <cmath>
+#ifndef GTEST_OS_ZEPHYR
 #include <csignal>  // NOLINT: raise(3) is used on some platforms
+#endif
 #include <cstdint>
 #include <cstdlib>
 #include <cstring>

googletest/src/gtest_main.cc

@@ -47,13 +47,23 @@ void loop() { RUN_ALL_TESTS(); }
 }
 #endif
 
-#elif defined(GTEST_OS_QURT)
-// QuRT: program entry point is main, but argc/argv are unusable.
+#elif defined(GTEST_OS_QURT) || defined(GTEST_OS_ZEPHYR)
+// Program entry point is main, but argc/argv are unusable.
+
+#if defined(GTEST_OS_ZEPHYR)
+#undef GTEST_API_
+#define GTEST_API_
+#endif
 
 GTEST_API_ int main() {
   printf("Running main() from %s\n", __FILE__);
   testing::InitGoogleTest();
-  return RUN_ALL_TESTS();
+
+  int ret = RUN_ALL_TESTS();
+#if defined(GTEST_OS_ZEPHYR)
+  _exit( ret );
+#endif
+  return ret;
 }
 #else
 // Normal platforms: program entry point is main, argc/argv are initialized.

googletest/test/googletest-printers-test.cc

@@ -2030,6 +2030,26 @@ TEST(PrintOneofTest, Basic) {
       PrintToString(Type(NonPrintable{})));
 }
 
+TEST(PrintVariantTest, Monostate) {
+  EXPECT_EQ("(monostate)", PrintToString(std::monostate()));
+
+#if GTEST_HAS_EXCEPTIONS
+  struct ThrowOnMove {
+    ThrowOnMove() = default;
+    ThrowOnMove(ThrowOnMove&& other) { *this = std::move(other); }
+    ThrowOnMove& operator=(ThrowOnMove&&) {
+      (void)std::vector<bool>().at(0);
+      return *this;
+    }
+  };
+  std::variant<std::monostate, ThrowOnMove> v = std::monostate();
+  EXPECT_EQ("('std::monostate(index = 0)' with value (monostate))",
+            PrintToString(v));
+  EXPECT_THROW(v = ThrowOnMove(), std::out_of_range);
+  EXPECT_EQ("(valueless)", PrintToString(v));
+#endif
+}
+
 #if GTEST_INTERNAL_HAS_COMPARE_LIB
 TEST(PrintOrderingTest, Basic) {
   EXPECT_EQ("(less)", PrintToString(std::strong_ordering::less));