Export of internal Abseil changes

--
f13697e3d33803f9667d124072da4f6dd8bfbf85 by Andy Soffer <asoffer@google.com>:

Addressing https://github.com/abseil/abseil-cpp/issues/314, fixing
CMakeLists.txt to reference ABSL_TEST_COPTS rather than ABSL_DEFAULT_COPTS.

ABSL_TEST_COPTS should be preferred for all tests so that they are configured consistently (moreover, CMake should agree with Bazel).

PiperOrigin-RevId: 274932312

--
c31c24a1fa6bb98136adf51ef37c0818ac366690 by Derek Mauro <dmauro@google.com>:

Silence MSAN in the stack consumption test utility

PiperOrigin-RevId: 274912950

--
2412913c05a246cd527cd4c31452f126e9129f3a by CJ Johnson <johnsoncj@google.com>:

Internal change

PiperOrigin-RevId: 274847103

--
75e984a93b5760873501b96ac3229ccfd955daf8 by Abseil Team <absl-team@google.com>:

Reformat BUILD file to current standards.

PiperOrigin-RevId: 274815392

--
a2780e085f1df1e4ca2c814a58c893d1b78a1d9c by Samuel Benzaquen <sbenza@google.com>:

Fix invalid result regarding leading zeros in the exponent.

PiperOrigin-RevId: 274808017

--
dd402e1cb5c4ebacb576372ae24bf289d729d323 by Samuel Benzaquen <sbenza@google.com>:

Make string_view's relational operators constexpr when possible.

PiperOrigin-RevId: 274807873

--
b4ef32565653a5da1cb8bb8d0351586d23519658 by Abseil Team <absl-team@google.com>:

Internal rework.

PiperOrigin-RevId: 274787159

--
70d81971c5914e6785b8e8a9d4f6eb2655dd62c0 by Gennadiy Rozental <rogeeff@google.com>:

Internal rework.

PiperOrigin-RevId: 274715557

--
14f5b0440e353b899cafaaa15b53e77f98f401af by Gennadiy Rozental <rogeeff@google.com>:

Make deprecated statements about ParseFLag/UnparseFlag consistent in a file.

PiperOrigin-RevId: 274668123

--
2e85adbdbb92612e4d750bc34fbca3333128b42d by Abseil Team <absl-team@google.com>:

Allow absl::c_equal to be used with arrays.

This is achieved by allowing container size computation for arrays.

PiperOrigin-RevId: 274426830

--
219719f107226d328773e6cec99fb473f5d3119c by Gennadiy Rozental <rogeeff@google.com>:

Release correct extension interfaces to support usage of absl::Time and absl::Duration as ABSL_FLAG

PiperOrigin-RevId: 274273788

--
47a77f93fda23b69b4a6bdbd506fe643c69a5579 by Gennadiy Rozental <rogeeff@google.com>:

Rework of flags persistence/FlagSaver internals.

PiperOrigin-RevId: 274225213

--
7807be3fe757c19e3b0c487298387683d4c9f5b3 by Abseil Team <absl-team@google.com>:

Switch reference to sdkddkver.h to lowercase, matching conventions used in the Windows SDK and other uses. This helps to avoid confusion on case-sensitive filesystems.

PiperOrigin-RevId: 274061877

--
561304090087a19f1d10f0475f564fe132ebf06e by Andy Getzendanner <durandal@google.com>:

Fix ABSL_WAITER_MODE detection for mingw

Import of https://github.com/abseil/abseil-cpp/pull/342

PiperOrigin-RevId: 274030071

--
9b3caac2cf202b9d440dfa1b4ffd538ac4bf715b by Derek Mauro <dmauro@google.com>:

Support using Abseil with the musl libc implementation.

Only test changes were required:
  * Workaround for a bug in sigaltstack() on musl
  * printf-style pointer formatting (%p) is implementation defined,
    so verify StrFromat produces something compatible
  * Fix detection of feenableexcept()

PiperOrigin-RevId: 274011666

--
73e8a938fc139e1cc8670d4513a445bacc855539 by Abseil Team <absl-team@google.com>:

nvcc workaround: explicitly specify the definition of node_handle::Base

PiperOrigin-RevId: 274011392

--
ab9cc6d042aca7d48e16c504ab10eab39433f4b2 by Andy Soffer <asoffer@google.com>:

Internal change

PiperOrigin-RevId: 273996318

--
e567c4979ca99c7e71821ec1523b8f5edd2c76ac by Abseil Team <absl-team@google.com>:

Introduce a type alias to work around an nvcc bug.

On the previous code, nvcc gets confused thinking that T has to be a parameter
pack, as IsDecomposable accepts one.

PiperOrigin-RevId: 273980472

--
105b6e6339b77a32f4432de05f44cd3f9c436751 by Eric Fiselier <ericwf@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 273955589

--
8feb87ff1d7e721fe094855e67c19539d5e582b7 by Abseil Team <absl-team@google.com>:

Avoid dual-exporting scheduling_mode.h

PiperOrigin-RevId: 273825112

--
fbc37854776d295dae98fb9d06a541f296daab95 by Andy Getzendanner <durandal@google.com>:

Fix ABSL_HAVE_ALARM check on mingw

Import of https://github.com/abseil/abseil-cpp/pull/341

PiperOrigin-RevId: 273817839

--
6aedcd63a735b9133e143b043744ba0a25407f6f by Andy Soffer <asoffer@google.com>:

Remove bit_gen_view.h now that all callers have been migrated to bit_gen_ref.h
Tested:
TGP - https://test.corp.google.com/ui#id=OCL:273762409:BASE:273743370:1570639020744:3001bcb5

PiperOrigin-RevId: 273810331

--
6573de24a66ba715c579f7f32b5c48a1d743c7f8 by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 273589963

--
91c8c28b6dca26d98b39e8e06a8ed17c701ff793 by Abseil Team <absl-team@google.com>:

Update macro name for `ABSL_GUARDED_BY()` in the example section.

PiperOrigin-RevId: 273286983

--
0ff7d1a93d70f8ecd693f8dbb98b7a4a016ca2a4 by Abseil Team <absl-team@google.com>:

Fix potential integer overflow in the absl time library.

In absl::FromTM, the tm.tm_year is added by 1900 regarding that tm.tm_year represents the years since 1900. This change checks integer overflow before doing the arithmetic operation.

PiperOrigin-RevId: 273092952

--
b41c2a1310086807be09a833099ae6d4009f037c by Gennadiy Rozental <rogeeff@google.com>:

Correctly Unlock the global mutex in case of concurrent flag initialization.

Fixes #386

PiperOrigin-RevId: 272979749

--
c53103e71b2a6063af3c6d4ff68aa2d8f9ae9e06 by Abseil Team <absl-team@google.com>:

Try to become idle only when there is no wakeup.

Immediately after waking up (when futex wait returns), the current thread tries
to become idle doing bunch of memory loads and a branch.  Problem is that there
is a good chance that we woke up due to a wakeup, especially for actively used
threads.  For such wakeups, calling MaybeBecomeIdle() would be a waste of
cycles.

Instead, call MaybeBecomeIdle() only when we are sure there is no wakeup.  For
idle threads the net effect should be the same.  For active, threads this will
be more efficient.

Moreover, since MaybeBecomeIdle() is called before waiting on the futex, the
current thread will try to become idle before sleeping.  This should result
in more accurate idleness and more efficient release of thread resources.

PiperOrigin-RevId: 272940381
GitOrigin-RevId: f13697e3d33803f9667d124072da4f6dd8bfbf85
Change-Id: I36de05aec12595183725652dd362dfa58fb095d0

8 files changed, 148 insertions, 76 deletions

diff --git a/absl/strings/BUILD.bazel b/absl/strings/BUILD.bazel
index 729bdd761f0f..4863ead2992e 100644
--- a/absl/strings/BUILD.bazel
+++ b/absl/strings/BUILD.bazel
@@ -630,6 +630,7 @@ cc_test(
     visibility = ["//visibility:private"],
     deps = [
         ":str_format_internal",
+        "//absl/base:raw_logging_internal",
         "//absl/numeric:int128",
         "@com_google_googletest//:gtest_main",
     ],
diff --git a/absl/strings/CMakeLists.txt b/absl/strings/CMakeLists.txt
index ccff44419341..3f9079575011 100644
--- a/absl/strings/CMakeLists.txt
+++ b/absl/strings/CMakeLists.txt
@@ -461,6 +461,7 @@ absl_cc_test(
     ${ABSL_TEST_COPTS}
   DEPS
     absl::str_format_internal
+    absl::raw_logging_internal
     absl::int128
     gmock_main
 )
diff --git a/absl/strings/charconv_test.cc b/absl/strings/charconv_test.cc
index b58fad269d8b..9090e9c89c50 100644
--- a/absl/strings/charconv_test.cc
+++ b/absl/strings/charconv_test.cc
@@ -511,6 +511,13 @@ TEST(FromChars, Overflow) {
   EXPECT_EQ(f, std::numeric_limits<float>::max());
 }
 
+TEST(FromChars, RegressionTestsFromFuzzer) {
+  absl::string_view src = "0x21900000p00000000099";
+  float f;
+  auto result = absl::from_chars(src.data(), src.data() + src.size(), f);
+  EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+}
+
 TEST(FromChars, ReturnValuePtr) {
   // Check that `ptr` points one past the number scanned, even if that number
   // is not representable.
diff --git a/absl/strings/internal/charconv_parse.cc b/absl/strings/internal/charconv_parse.cc
index f3c7232403a1..fa9a8965fe6b 100644
--- a/absl/strings/internal/charconv_parse.cc
+++ b/absl/strings/internal/charconv_parse.cc
@@ -253,6 +253,12 @@ std::size_t ConsumeDigits(const char* begin, const char* end, int max_digits,
     assert(max_digits * 4 <= std::numeric_limits<T>::digits);
   }
   const char* const original_begin = begin;
+
+  // Skip leading zeros, but only if *out is zero.
+  // They don't cause an overflow so we don't have to count them for
+  // `max_digits`.
+  while (!*out && end != begin && *begin == '0') ++begin;
+
   T accumulator = *out;
   const char* significant_digits_end =
       (end - begin > max_digits) ? begin + max_digits : end;
diff --git a/absl/strings/internal/str_format/convert_test.cc b/absl/strings/internal/str_format/convert_test.cc
index 814ccf4c65e6..ab8d53914119 100644
--- a/absl/strings/internal/str_format/convert_test.cc
+++ b/absl/strings/internal/str_format/convert_test.cc
@@ -5,7 +5,9 @@
 #include <cmath>
 #include <string>
 
+#include "gmock/gmock.h"
 #include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
 #include "absl/strings/internal/str_format/bind.h"
 
 namespace absl {
@@ -157,12 +159,20 @@ TEST_F(FormatConvertTest, StringPrecision) {
   EXPECT_EQ("ABC", FormatPack(format2, {FormatArgImpl(p)}));
 }
 
+// Pointer formatting is implementation defined. This checks that the argument
+// can be matched to `ptr`.
+MATCHER_P(MatchesPointerString, ptr, "") {
+  if (ptr == nullptr && arg == "(nil)") {
+    return true;
+  }
+  void* parsed = nullptr;
+  if (sscanf(arg.c_str(), "%p", &parsed) != 1) {
+    ABSL_RAW_LOG(FATAL, "Could not parse %s", arg.c_str());
+  }
+  return ptr == parsed;
+}
+
 TEST_F(FormatConvertTest, Pointer) {
-#ifdef _MSC_VER
-  // MSVC's printf implementation prints pointers differently. We can't easily
-  // compare our implementation to theirs.
-  return;
-#endif
   static int x = 0;
   const int *xp = &x;
   char c = 'h';
@@ -173,48 +183,62 @@ TEST_F(FormatConvertTest, Pointer) {
   using VoidF = void (*)();
   VoidF fp = [] {}, fnil = nullptr;
   volatile char vc;
-  volatile char* vcp = &vc;
-  volatile char* vcnil = nullptr;
-  const FormatArgImpl args[] = {
+  volatile char *vcp = &vc;
+  volatile char *vcnil = nullptr;
+  const FormatArgImpl args_array[] = {
       FormatArgImpl(xp),   FormatArgImpl(cp),  FormatArgImpl(inil),
       FormatArgImpl(cnil), FormatArgImpl(mcp), FormatArgImpl(fp),
       FormatArgImpl(fnil), FormatArgImpl(vcp), FormatArgImpl(vcnil),
   };
-  struct Expectation {
-    std::string out;
-    const char *fmt;
-  };
-  const Expectation kExpect[] = {
-      {StrPrint("%p", &x), "%p"},
-      {StrPrint("%20p", &x), "%20p"},
-      {StrPrint("%.1p", &x), "%.1p"},
-      {StrPrint("%.20p", &x), "%.20p"},
-      {StrPrint("%30.20p", &x), "%30.20p"},
-
-      {StrPrint("%-p", &x), "%-p"},
-      {StrPrint("%-20p", &x), "%-20p"},
-      {StrPrint("%-.1p", &x), "%-.1p"},
-      {StrPrint("%.20p", &x), "%.20p"},
-      {StrPrint("%-30.20p", &x), "%-30.20p"},
-
-      {StrPrint("%p", cp), "%2$p"},   // const char*
-      {"(nil)", "%3$p"},              // null const char *
-      {"(nil)", "%4$p"},              // null const int *
-      {StrPrint("%p", mcp), "%5$p"},  // nonconst char*
-
-      {StrPrint("%p", fp), "%6$p"},   // function pointer
-      {StrPrint("%p", vcp), "%8$p"},  // function pointer
-
-#ifndef __APPLE__
-      // Apple's printf differs here (0x0 vs. nil)
-      {StrPrint("%p", fnil), "%7$p"},   // null function pointer
-      {StrPrint("%p", vcnil), "%9$p"},  // null function pointer
-#endif
-  };
-  for (const Expectation &e : kExpect) {
-    UntypedFormatSpecImpl format(e.fmt);
-    EXPECT_EQ(e.out, FormatPack(format, absl::MakeSpan(args))) << e.fmt;
-  }
+  auto args = absl::MakeConstSpan(args_array);
+
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%20p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%.1p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%.20p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%30.20p"), args),
+              MatchesPointerString(&x));
+
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-20p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-.1p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%.20p"), args),
+              MatchesPointerString(&x));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-30.20p"), args),
+              MatchesPointerString(&x));
+
+  // const char*
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%2$p"), args),
+              MatchesPointerString(cp));
+  // null const int*
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%3$p"), args),
+              MatchesPointerString(nullptr));
+  // null const char*
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%4$p"), args),
+              MatchesPointerString(nullptr));
+  // nonconst char*
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%5$p"), args),
+              MatchesPointerString(mcp));
+
+  // function pointers
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%6$p"), args),
+              MatchesPointerString(reinterpret_cast<const void*>(fp)));
+  EXPECT_THAT(
+      FormatPack(UntypedFormatSpecImpl("%8$p"), args),
+      MatchesPointerString(reinterpret_cast<volatile const void *>(vcp)));
+
+  // null function pointers
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%7$p"), args),
+              MatchesPointerString(nullptr));
+  EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%9$p"), args),
+              MatchesPointerString(nullptr));
 }
 
 struct Cardinal {
diff --git a/absl/strings/numbers_test.cc b/absl/strings/numbers_test.cc
index 77d7e7835b8b..4edf8891be3a 100644
--- a/absl/strings/numbers_test.cc
+++ b/absl/strings/numbers_test.cc
@@ -713,11 +713,11 @@ TEST(stringtest, safe_strtou64_base_length_delimited) {
   }
 }
 
-// feenableexcept() and fedisableexcept() are missing on macOS, MSVC,
-// and WebAssembly.
-#if defined(_MSC_VER) || defined(__APPLE__) || defined(__EMSCRIPTEN__)
-#define ABSL_MISSING_FEENABLEEXCEPT 1
-#define ABSL_MISSING_FEDISABLEEXCEPT 1
+// feenableexcept() and fedisableexcept() are extensions supported by some libc
+// implementations.
+#if defined(__GLIBC__) || defined(__BIONIC__)
+#define ABSL_HAVE_FEENABLEEXCEPT 1
+#define ABSL_HAVE_FEDISABLEEXCEPT 1
 #endif
 
 class SimpleDtoaTest : public testing::Test {
@@ -725,7 +725,7 @@ class SimpleDtoaTest : public testing::Test {
   void SetUp() override {
     // Store the current floating point env & clear away any pending exceptions.
     feholdexcept(&fp_env_);
-#ifndef ABSL_MISSING_FEENABLEEXCEPT
+#ifdef ABSL_HAVE_FEENABLEEXCEPT
     // Turn on floating point exceptions.
     feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
 #endif
@@ -735,7 +735,7 @@ class SimpleDtoaTest : public testing::Test {
     // Restore the floating point environment to the original state.
     // In theory fedisableexcept is unnecessary; fesetenv will also do it.
     // In practice, our toolchains have subtle bugs.
-#ifndef ABSL_MISSING_FEDISABLEEXCEPT
+#ifdef ABSL_HAVE_FEDISABLEEXCEPT
     fedisableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
 #endif
     fesetenv(&fp_env_);
diff --git a/absl/strings/string_view.h b/absl/strings/string_view.h
index 82344eb246b3..3438ccc12a7d 100644
--- a/absl/strings/string_view.h
+++ b/absl/strings/string_view.h
@@ -40,6 +40,13 @@ using std::string_view;
 
 #else  // ABSL_HAVE_STD_STRING_VIEW
 
+#if ABSL_HAVE_BUILTIN(__builtin_memcmp) || \
+    (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_INTERNAL_STRING_VIEW_MEMCMP __builtin_memcmp
+#else  // ABSL_HAVE_BUILTIN(__builtin_memcmp)
+#define ABSL_INTERNAL_STRING_VIEW_MEMCMP memcmp
+#endif  // ABSL_HAVE_BUILTIN(__builtin_memcmp)
+
 #include <cassert>
 #include <cstddef>
 #include <cstring>
@@ -381,16 +388,13 @@ class string_view {
   // view. Note that in the case of data equality, a further comparison is made
   // on the respective sizes of the two `string_view`s to determine which is
   // smaller, equal, or greater.
-  int compare(string_view x) const noexcept {
-    auto min_length = (std::min)(length_, x.length_);
-    if (min_length > 0) {
-      int r = memcmp(ptr_, x.ptr_, min_length);
-      if (r < 0) return -1;
-      if (r > 0) return 1;
-    }
-    if (length_ < x.length_) return -1;
-    if (length_ > x.length_) return 1;
-    return 0;
+  constexpr int compare(string_view x) const noexcept {
+    return CompareImpl(
+        length_, x.length_,
+        length_ == 0 || x.length_ == 0
+            ? 0
+            : ABSL_INTERNAL_STRING_VIEW_MEMCMP(
+                  ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_));
   }
 
   // Overload of `string_view::compare()` for comparing a substring of the
@@ -528,6 +532,14 @@ class string_view {
 #endif
   }
 
+  static constexpr int CompareImpl(size_type length_a, size_type length_b,
+                                   int compare_result) {
+    return compare_result == 0 ? static_cast<int>(length_a > length_b) -
+                                     static_cast<int>(length_a < length_b)
+                               : static_cast<int>(compare_result > 0) -
+                                     static_cast<int>(compare_result < 0);
+  }
+
   const char* ptr_;
   size_type length_;
 };
@@ -535,33 +547,29 @@ class string_view {
 // This large function is defined inline so that in a fairly common case where
 // one of the arguments is a literal, the compiler can elide a lot of the
 // following comparisons.
-inline bool operator==(string_view x, string_view y) noexcept {
-  auto len = x.size();
-  if (len != y.size()) {
-    return false;
-  }
-
-  return x.data() == y.data() || len <= 0 ||
-         memcmp(x.data(), y.data(), len) == 0;
+constexpr bool operator==(string_view x, string_view y) noexcept {
+  return x.size() == y.size() &&
+         (x.empty() ||
+          ABSL_INTERNAL_STRING_VIEW_MEMCMP(x.data(), y.data(), x.size()) == 0);
 }
 
-inline bool operator!=(string_view x, string_view y) noexcept {
+constexpr bool operator!=(string_view x, string_view y) noexcept {
   return !(x == y);
 }
 
-inline bool operator<(string_view x, string_view y) noexcept {
-  auto min_size = (std::min)(x.size(), y.size());
-  const int r = min_size == 0 ? 0 : memcmp(x.data(), y.data(), min_size);
-  return (r < 0) || (r == 0 && x.size() < y.size());
+constexpr bool operator<(string_view x, string_view y) noexcept {
+  return x.compare(y) < 0;
 }
 
-inline bool operator>(string_view x, string_view y) noexcept { return y < x; }
+constexpr bool operator>(string_view x, string_view y) noexcept {
+  return y < x;
+}
 
-inline bool operator<=(string_view x, string_view y) noexcept {
+constexpr bool operator<=(string_view x, string_view y) noexcept {
   return !(y < x);
 }
 
-inline bool operator>=(string_view x, string_view y) noexcept {
+constexpr bool operator>=(string_view x, string_view y) noexcept {
   return !(x < y);
 }
 
@@ -570,6 +578,8 @@ std::ostream& operator<<(std::ostream& o, string_view piece);
 
 }  // namespace absl
 
+#undef ABSL_INTERNAL_STRING_VIEW_MEMCMP
+
 #endif  // ABSL_HAVE_STD_STRING_VIEW
 
 namespace absl {
diff --git a/absl/strings/string_view_test.cc b/absl/strings/string_view_test.cc
index eb8b170bbbde..86f2fbcd003a 100644
--- a/absl/strings/string_view_test.cc
+++ b/absl/strings/string_view_test.cc
@@ -974,6 +974,29 @@ TEST(StringViewTest, ConstexprCompiles) {
   EXPECT_EQ(cstr_strlen.length(), 3);
   constexpr absl::string_view cstr_strlen2 = "bar";
   EXPECT_EQ(cstr_strlen2, "bar");
+
+#if ABSL_HAVE_BUILTIN(__builtin_memcmp) || \
+    (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON 1
+#endif
+#ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON
+  constexpr absl::string_view foo = "foo";
+  constexpr absl::string_view bar = "bar";
+  constexpr bool foo_eq_bar = foo == bar;
+  constexpr bool foo_ne_bar = foo != bar;
+  constexpr bool foo_lt_bar = foo < bar;
+  constexpr bool foo_le_bar = foo <= bar;
+  constexpr bool foo_gt_bar = foo > bar;
+  constexpr bool foo_ge_bar = foo >= bar;
+  constexpr int foo_compare_bar = foo.compare(bar);
+  EXPECT_FALSE(foo_eq_bar);
+  EXPECT_TRUE(foo_ne_bar);
+  EXPECT_FALSE(foo_lt_bar);
+  EXPECT_FALSE(foo_le_bar);
+  EXPECT_TRUE(foo_gt_bar);
+  EXPECT_TRUE(foo_ge_bar);
+  EXPECT_GT(foo_compare_bar, 0);
+#endif
 #endif
 
 #if !defined(__clang__) || 3 < __clang_major__ || \