Introduces a new porting flag (GTEST_HAS_FILE_SYSTEM) to indicate whether a platform supports filesystem operations.

PiperOrigin-RevId: 494751986
Change-Id: I07f73bdf478a73934b8f1a69c1ab4abda1b231ae

5 files changed, 115 insertions, 40 deletions

diff --git a/googletest/include/gtest/internal/gtest-filepath.h b/googletest/include/gtest/internal/gtest-filepath.h
index dd7a3a4..ceba8f2 100644
--- a/googletest/include/gtest/internal/gtest-filepath.h
+++ b/googletest/include/gtest/internal/gtest-filepath.h
@@ -42,11 +42,14 @@
 #ifndef GOOGLETEST_INCLUDE_GTEST_INTERNAL_GTEST_FILEPATH_H_
 #define GOOGLETEST_INCLUDE_GTEST_INTERNAL_GTEST_FILEPATH_H_
 
+#include "gtest/internal/gtest-port.h"
 #include "gtest/internal/gtest-string.h"
 
 GTEST_DISABLE_MSC_WARNINGS_PUSH_(4251 \
 /* class A needs to have dll-interface to be used by clients of class B */)
 
+#if GTEST_HAS_FILE_SYSTEM
+
 namespace testing {
 namespace internal {
 
@@ -217,4 +220,6 @@ class GTEST_API_ FilePath {
 
 GTEST_DISABLE_MSC_WARNINGS_POP_()  //  4251
 
+#endif  // GTEST_HAS_FILE_SYSTEM
+
 #endif  // GOOGLETEST_INCLUDE_GTEST_INTERNAL_GTEST_FILEPATH_H_
diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h
index c3b131f..01bfd1f 100644
--- a/googletest/include/gtest/internal/gtest-port.h
+++ b/googletest/include/gtest/internal/gtest-port.h
@@ -83,6 +83,8 @@
 //   GTEST_HAS_STD_WSTRING    - Define it to 1/0 to indicate that
 //                              std::wstring does/doesn't work (Google Test can
 //                              be used where std::wstring is unavailable).
+//   GTEST_HAS_FILE_SYSTEM    - Define it to 1/0 to indicate whether or not a
+//                              file system is/isn't available.
 //   GTEST_HAS_SEH            - Define it to 1/0 to indicate whether the
 //                              compiler supports Microsoft's "Structured
 //                              Exception Handling".
@@ -463,6 +465,11 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 
 #endif  // GTEST_HAS_STD_WSTRING
 
+#ifndef GTEST_HAS_FILE_SYSTEM
+// Most platforms support a file system.
+#define GTEST_HAS_FILE_SYSTEM 1
+#endif  // GTEST_HAS_FILE_SYSTEM
+
 // Determines whether RTTI is available.
 #ifndef GTEST_HAS_RTTI
 // The user didn't tell us whether RTTI is enabled, so we need to
@@ -580,10 +587,11 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 // output correctness and to implement death tests.
 #ifndef GTEST_HAS_STREAM_REDIRECTION
 // By default, we assume that stream redirection is supported on all
-// platforms except known mobile / embedded ones.
+// platforms except known mobile / embedded ones. Also, if the port doesn't have
+// a file system, stream redirection is not supported.
 #if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_PHONE ||          \
     GTEST_OS_WINDOWS_RT || GTEST_OS_ESP8266 || GTEST_OS_XTENSA || \
-    GTEST_OS_QURT
+    GTEST_OS_QURT || !GTEST_HAS_FILE_SYSTEM
 #define GTEST_HAS_STREAM_REDIRECTION 0
 #else
 #define GTEST_HAS_STREAM_REDIRECTION 1
@@ -599,7 +607,10 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
      GTEST_OS_FREEBSD || GTEST_OS_NETBSD || GTEST_OS_FUCHSIA ||           \
      GTEST_OS_DRAGONFLY || GTEST_OS_GNU_KFREEBSD || GTEST_OS_HAIKU ||     \
      GTEST_OS_GNU_HURD)
+// Death tests require a file system to work properly.
+#if GTEST_HAS_FILE_SYSTEM
 #define GTEST_HAS_DEATH_TEST 1
+#endif  // GTEST_HAS_FILE_SYSTEM
 #endif
 
 // Determines whether to support type-driven tests.
@@ -1953,31 +1964,12 @@ inline std::string StripTrailingSpaces(std::string str) {
 
 namespace posix {
 
-// Functions with a different name on Windows.
-
+// File system porting.
+#if GTEST_HAS_FILE_SYSTEM
 #if GTEST_OS_WINDOWS
 
 typedef struct _stat StatStruct;
 
-#ifdef __BORLANDC__
-inline int DoIsATTY(int fd) { return isatty(fd); }
-inline int StrCaseCmp(const char* s1, const char* s2) {
-  return stricmp(s1, s2);
-}
-inline char* StrDup(const char* src) { return strdup(src); }
-#else  // !__BORLANDC__
-#if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_ZOS || GTEST_OS_IOS || \
-    GTEST_OS_WINDOWS_PHONE || GTEST_OS_WINDOWS_RT || defined(ESP_PLATFORM)
-inline int DoIsATTY(int /* fd */) { return 0; }
-#else
-inline int DoIsATTY(int fd) { return _isatty(fd); }
-#endif  // GTEST_OS_WINDOWS_MOBILE
-inline int StrCaseCmp(const char* s1, const char* s2) {
-  return _stricmp(s1, s2);
-}
-inline char* StrDup(const char* src) { return _strdup(src); }
-#endif  // __BORLANDC__
-
 #if GTEST_OS_WINDOWS_MOBILE
 inline int FileNo(FILE* file) { return reinterpret_cast<int>(_fileno(file)); }
 // Stat(), RmDir(), and IsDir() are not needed on Windows CE at this
@@ -1993,15 +1985,10 @@ inline bool IsDir(const StatStruct& st) { return (_S_IFDIR & st.st_mode) != 0; }
 typedef struct stat StatStruct;
 
 inline int FileNo(FILE* file) { return fileno(file); }
-inline int DoIsATTY(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); }
 
@@ -2010,12 +1997,7 @@ inline bool IsDir(const StatStruct& st) { return S_ISDIR(st.st_mode); }
 typedef struct stat StatStruct;
 
 inline int FileNo(FILE* file) { return fileno(file); }
-inline int DoIsATTY(int fd) { return isatty(fd); }
 inline int Stat(const char* path, StatStruct* buf) { return stat(path, buf); }
-inline int StrCaseCmp(const char* s1, const char* s2) {
-  return strcasecmp(s1, s2);
-}
-inline char* StrDup(const char* src) { return strdup(src); }
 #if GTEST_OS_QURT
 // QuRT doesn't support any directory functions, including rmdir
 inline int RmDir(const char*) { return 0; }
@@ -2025,6 +2007,48 @@ inline int RmDir(const char* dir) { return rmdir(dir); }
 inline bool IsDir(const StatStruct& st) { return S_ISDIR(st.st_mode); }
 
 #endif  // GTEST_OS_WINDOWS
+#endif  // GTEST_HAS_FILE_SYSTEM
+
+// Other functions with a different name on Windows.
+
+#if GTEST_OS_WINDOWS
+
+#ifdef __BORLANDC__
+inline int DoIsATTY(int fd) { return isatty(fd); }
+inline int StrCaseCmp(const char* s1, const char* s2) {
+  return stricmp(s1, s2);
+}
+inline char* StrDup(const char* src) { return strdup(src); }
+#else  // !__BORLANDC__
+#if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_ZOS || GTEST_OS_IOS || \
+    GTEST_OS_WINDOWS_PHONE || GTEST_OS_WINDOWS_RT || defined(ESP_PLATFORM)
+inline int DoIsATTY(int /* fd */) { return 0; }
+#else
+inline int DoIsATTY(int fd) { return _isatty(fd); }
+#endif  // GTEST_OS_WINDOWS_MOBILE
+inline int StrCaseCmp(const char* s1, const char* s2) {
+  return _stricmp(s1, s2);
+}
+inline char* StrDup(const char* src) { return _strdup(src); }
+#endif  // __BORLANDC__
+
+#elif GTEST_OS_ESP8266
+
+inline int DoIsATTY(int fd) { return isatty(fd); }
+inline int StrCaseCmp(const char* s1, const char* s2) {
+  return strcasecmp(s1, s2);
+}
+inline char* StrDup(const char* src) { return strdup(src); }
+
+#else
+
+inline int DoIsATTY(int fd) { return isatty(fd); }
+inline int StrCaseCmp(const char* s1, const char* s2) {
+  return strcasecmp(s1, s2);
+}
+inline char* StrDup(const char* src) { return strdup(src); }
+
+#endif  // GTEST_OS_WINDOWS
 
 inline int IsATTY(int fd) {
   // DoIsATTY might change errno (for example ENOTTY in case you redirect stdout
@@ -2044,7 +2068,7 @@ GTEST_DISABLE_MSC_DEPRECATED_PUSH_()
 // ChDir(), FReopen(), FDOpen(), Read(), Write(), Close(), and
 // StrError() aren't needed on Windows CE at this time and thus not
 // defined there.
-
+#if GTEST_HAS_FILE_SYSTEM
 #if !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_WINDOWS_PHONE &&           \
     !GTEST_OS_WINDOWS_RT && !GTEST_OS_ESP8266 && !GTEST_OS_XTENSA && \
     !GTEST_OS_QURT
@@ -2066,7 +2090,7 @@ inline FILE* FReopen(const char* path, const char* mode, FILE* stream) {
   return freopen(path, mode, stream);
 }
 inline FILE* FDOpen(int fd, const char* mode) { return fdopen(fd, mode); }
-#endif
+#endif  // !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_QURT
 inline int FClose(FILE* fp) { return fclose(fp); }
 #if !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_QURT
 inline int Read(int fd, void* buf, unsigned int count) {
@@ -2076,8 +2100,13 @@ inline int Write(int fd, const void* buf, unsigned int count) {
   return static_cast<int>(write(fd, buf, count));
 }
 inline int Close(int fd) { return close(fd); }
+#endif  // !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_QURT
+#endif  // GTEST_HAS_FILE_SYSTEM
+
+#if !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_QURT
 inline const char* StrError(int errnum) { return strerror(errnum); }
-#endif
+#endif  // !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_QURT
+
 inline const char* GetEnv(const char* name) {
 #if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_PHONE ||          \
     GTEST_OS_WINDOWS_RT || GTEST_OS_ESP8266 || GTEST_OS_XTENSA || \
diff --git a/googletest/src/gtest-filepath.cc b/googletest/src/gtest-filepath.cc
index bec5870..9d79ea4 100644
--- a/googletest/src/gtest-filepath.cc
+++ b/googletest/src/gtest-filepath.cc
@@ -57,6 +57,8 @@
 #define GTEST_PATH_MAX_ _POSIX_PATH_MAX
 #endif  // GTEST_OS_WINDOWS
 
+#if GTEST_HAS_FILE_SYSTEM
+
 namespace testing {
 namespace internal {
 
@@ -404,3 +406,5 @@ void FilePath::Normalize() {
 
 }  // namespace internal
 }  // namespace testing
+
+#endif  // GTEST_HAS_FILE_SYSTEM
diff --git a/googletest/src/gtest-internal-inl.h b/googletest/src/gtest-internal-inl.h
index 517cc13..ddef4bb 100644
--- a/googletest/src/gtest-internal-inl.h
+++ b/googletest/src/gtest-internal-inl.h
@@ -396,9 +396,11 @@ class GTEST_API_ UnitTestOptions {
   static bool MatchesFilter(const std::string& name, const char* filter);
 };
 
+#if GTEST_HAS_FILE_SYSTEM
 // Returns the current application's name, removing directory path if that
 // is present.  Used by UnitTestOptions::GetOutputFile.
 GTEST_API_ FilePath GetCurrentExecutableName();
+#endif  // GTEST_HAS_FILE_SYSTEM
 
 // The role interface for getting the OS stack trace as a string.
 class OsStackTraceGetterInterface {
@@ -840,9 +842,11 @@ class GTEST_API_ UnitTestImpl {
   // The UnitTest object that owns this implementation object.
   UnitTest* const parent_;
 
+#if GTEST_HAS_FILE_SYSTEM
   // The working directory when the first TEST() or TEST_F() was
   // executed.
   internal::FilePath original_working_dir_;
+#endif  // GTEST_HAS_FILE_SYSTEM
 
   // The default test part result reporters.
   DefaultGlobalTestPartResultReporter default_global_test_part_result_reporter_;
diff --git a/googletest/src/gtest.cc b/googletest/src/gtest.cc
index 51de00e..0803cf3 100644
--- a/googletest/src/gtest.cc
+++ b/googletest/src/gtest.cc
@@ -58,6 +58,7 @@
 #include "gtest/gtest-assertion-result.h"
 #include "gtest/gtest-spi.h"
 #include "gtest/internal/custom/gtest.h"
+#include "gtest/internal/gtest-port.h"
 
 #if GTEST_OS_LINUX
 
@@ -194,6 +195,7 @@ const char kStackTraceMarker[] = "\nStack trace:\n";
 // is specified on the command line.
 bool g_help_flag = false;
 
+#if GTEST_HAS_FILE_SYSTEM
 // Utility function to Open File for Writing
 static FILE* OpenFileForWriting(const std::string& output_file) {
   FILE* fileout = nullptr;
@@ -208,6 +210,7 @@ static FILE* OpenFileForWriting(const std::string& output_file) {
   }
   return fileout;
 }
+#endif  // GTEST_HAS_FILE_SYSTEM
 
 }  // namespace internal
 
@@ -620,6 +623,7 @@ static ::std::vector<std::string> g_argvs;
 #endif  // defined(GTEST_CUSTOM_GET_ARGVS_)
 }
 
+#if GTEST_HAS_FILE_SYSTEM
 // Returns the current application's name, removing directory path if that
 // is present.
 FilePath GetCurrentExecutableName() {
@@ -633,6 +637,7 @@ FilePath GetCurrentExecutableName() {
 
   return result.RemoveDirectoryName();
 }
+#endif  // GTEST_HAS_FILE_SYSTEM
 
 // Functions for processing the gtest_output flag.
 
@@ -647,6 +652,7 @@ std::string UnitTestOptions::GetOutputFormat() {
                            static_cast<size_t>(colon - gtest_output_flag));
 }
 
+#if GTEST_HAS_FILE_SYSTEM
 // Returns the name of the requested output file, or the default if none
 // was explicitly specified.
 std::string UnitTestOptions::GetAbsolutePathToOutputFile() {
@@ -677,6 +683,7 @@ std::string UnitTestOptions::GetAbsolutePathToOutputFile() {
       GetOutputFormat().c_str()));
   return result.string();
 }
+#endif  // GTEST_HAS_FILE_SYSTEM
 
 // Returns true if and only if the wildcard pattern matches the string. Each
 // pattern consists of regular characters, single-character wildcards (?), and
@@ -3262,7 +3269,12 @@ static void ColoredPrintf(GTestColor color, const char* fmt, ...) {
   va_start(args, fmt);
 
   static const bool in_color_mode =
+#if GTEST_HAS_FILE_SYSTEM
       ShouldUseColor(posix::IsATTY(posix::FileNo(stdout)) != 0);
+#else
+      false;
+#endif  // GTEST_HAS_FILE_SYSTEM
+
   const bool use_color = in_color_mode && (color != GTestColor::kDefault);
 
   if (!use_color) {
@@ -3867,6 +3879,7 @@ void TestEventRepeater::OnTestIterationEnd(const UnitTest& unit_test,
 
 // End TestEventRepeater
 
+#if GTEST_HAS_FILE_SYSTEM
 // This class generates an XML output file.
 class XmlUnitTestResultPrinter : public EmptyTestEventListener {
  public:
@@ -4414,7 +4427,9 @@ void XmlUnitTestResultPrinter::OutputXmlTestProperties(
 }
 
 // End XmlUnitTestResultPrinter
+#endif  // GTEST_HAS_FILE_SYSTEM
 
+#if GTEST_HAS_FILE_SYSTEM
 // This class generates an JSON output file.
 class JsonUnitTestResultPrinter : public EmptyTestEventListener {
  public:
@@ -4855,6 +4870,7 @@ std::string JsonUnitTestResultPrinter::TestPropertiesAsJson(
 }
 
 // End JsonUnitTestResultPrinter
+#endif  // GTEST_HAS_FILE_SYSTEM
 
 #if GTEST_CAN_STREAM_RESULTS_
 
@@ -4993,6 +5009,7 @@ void OsStackTraceGetter::UponLeavingGTest() GTEST_LOCK_EXCLUDED_(mutex_) {
 #endif  // GTEST_HAS_ABSL
 }
 
+#if GTEST_HAS_DEATH_TEST
 // A helper class that creates the premature-exit file in its
 // constructor and deletes the file in its destructor.
 class ScopedPrematureExitFile {
@@ -5030,6 +5047,7 @@ class ScopedPrematureExitFile {
   ScopedPrematureExitFile(const ScopedPrematureExitFile&) = delete;
   ScopedPrematureExitFile& operator=(const ScopedPrematureExitFile&) = delete;
 };
+#endif  // GTEST_HAS_DEATH_TEST
 
 }  // namespace internal
 
@@ -5355,6 +5373,7 @@ void UnitTest::RecordProperty(const std::string& key,
 // We don't protect this under mutex_, as we only support calling it
 // from the main thread.
 int UnitTest::Run() {
+#if GTEST_HAS_DEATH_TEST
   const bool in_death_test_child_process =
       GTEST_FLAG_GET(internal_run_death_test).length() > 0;
 
@@ -5383,6 +5402,7 @@ int UnitTest::Run() {
       in_death_test_child_process
           ? nullptr
           : internal::posix::GetEnv("TEST_PREMATURE_EXIT_FILE"));
+#endif  // GTEST_HAS_DEATH_TEST
 
   // Captures the value of GTEST_FLAG(catch_exceptions).  This value will be
   // used for the duration of the program.
@@ -5438,11 +5458,13 @@ int UnitTest::Run() {
              : 1;
 }
 
+#if GTEST_HAS_FILE_SYSTEM
 // Returns the working directory when the first TEST() or TEST_F() was
 // executed.
 const char* UnitTest::original_working_dir() const {
   return impl_->original_working_dir_.c_str();
 }
+#endif  // GTEST_HAS_FILE_SYSTEM
 
 // Returns the TestSuite object for the test that's currently running,
 // or NULL if no test is running.
@@ -5575,6 +5597,7 @@ void UnitTestImpl::SuppressTestEventsIfInSubprocess() {
 // UnitTestOptions. Must not be called before InitGoogleTest.
 void UnitTestImpl::ConfigureXmlOutput() {
   const std::string& output_format = UnitTestOptions::GetOutputFormat();
+#if GTEST_HAS_FILE_SYSTEM
   if (output_format == "xml") {
     listeners()->SetDefaultXmlGenerator(new XmlUnitTestResultPrinter(
         UnitTestOptions::GetAbsolutePathToOutputFile().c_str()));
@@ -5585,6 +5608,10 @@ void UnitTestImpl::ConfigureXmlOutput() {
     GTEST_LOG_(WARNING) << "WARNING: unrecognized output format \""
                         << output_format << "\" ignored.";
   }
+#else
+  GTEST_LOG_(ERROR) << "ERROR: alternative output formats require "
+                    << "GTEST_HAS_FILE_SYSTEM to be enabled";
+#endif  // GTEST_HAS_FILE_SYSTEM
 }
 
 #if GTEST_CAN_STREAM_RESULTS_
@@ -5747,10 +5774,12 @@ bool UnitTestImpl::RunAllTests() {
   // user didn't call InitGoogleTest.
   PostFlagParsingInit();
 
+#if GTEST_HAS_FILE_SYSTEM
   // Even if sharding is not on, test runners may want to use the
   // GTEST_SHARD_STATUS_FILE to query whether the test supports the sharding
   // protocol.
   internal::WriteToShardStatusFileIfNeeded();
+#endif  // GTEST_HAS_FILE_SYSTEM
 
   // True if and only if we are in a subprocess for running a thread-safe-style
   // death test.
@@ -5930,6 +5959,7 @@ bool UnitTestImpl::RunAllTests() {
   return !failed;
 }
 
+#if GTEST_HAS_FILE_SYSTEM
 // Reads the GTEST_SHARD_STATUS_FILE environment variable, and creates the file
 // if the variable is present. If a file already exists at this location, this
 // function will write over it. If the variable is present, but the file cannot
@@ -5949,6 +5979,7 @@ void WriteToShardStatusFileIfNeeded() {
     fclose(file);
   }
 }
+#endif  // GTEST_HAS_FILE_SYSTEM
 
 // Checks whether sharding is enabled by examining the relevant
 // environment variable values. If the variables are present,
@@ -6140,6 +6171,7 @@ void UnitTestImpl::ListTestsMatchingFilter() {
     }
   }
   fflush(stdout);
+  #if GTEST_HAS_FILE_SYSTEM
   const std::string& output_format = UnitTestOptions::GetOutputFormat();
   if (output_format == "xml" || output_format == "json") {
     FILE* fileout = OpenFileForWriting(
@@ -6157,6 +6189,7 @@ void UnitTestImpl::ListTestsMatchingFilter() {
     fprintf(fileout, "%s", StringStreamToString(&stream).c_str());
     fclose(fileout);
   }
+#endif  // GTEST_HAS_FILE_SYSTEM
 }
 
 // Sets the OS stack trace getter.
@@ -6545,7 +6578,7 @@ static bool ParseGoogleTestFlag(const char* const arg) {
   return false;
 }
 
-#if GTEST_USE_OWN_FLAGFILE_FLAG_
+#if GTEST_USE_OWN_FLAGFILE_FLAG_ && GTEST_HAS_FILE_SYSTEM
 static void LoadFlagsFromFile(const std::string& path) {
   FILE* flagfile = posix::FOpen(path.c_str(), "r");
   if (!flagfile) {
@@ -6561,7 +6594,7 @@ static void LoadFlagsFromFile(const std::string& path) {
     if (!ParseGoogleTestFlag(lines[i].c_str())) g_help_flag = true;
   }
 }
-#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_
+#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_ && GTEST_HAS_FILE_SYSTEM
 
 // Parses the command line for Google Test flags, without initializing
 // other parts of Google Test.  The type parameter CharType can be
@@ -6578,12 +6611,12 @@ void ParseGoogleTestFlagsOnlyImpl(int* argc, CharType** argv) {
     bool remove_flag = false;
     if (ParseGoogleTestFlag(arg)) {
       remove_flag = true;
-#if GTEST_USE_OWN_FLAGFILE_FLAG_
+#if GTEST_USE_OWN_FLAGFILE_FLAG_ && GTEST_HAS_FILE_SYSTEM
     } else if (ParseFlag(arg, "flagfile", &flagfile_value)) {
       GTEST_FLAG_SET(flagfile, flagfile_value);
       LoadFlagsFromFile(flagfile_value);
       remove_flag = true;
-#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_
+#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_ && GTEST_HAS_FILE_SYSTEM
     } else if (arg_string == "--help" || HasGoogleTestFlagPrefix(arg)) {
       // Both help flag and unrecognized Google Test flags (excluding
       // internal ones) trigger help display.