Export of internal Abseil changes

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ca5ce10fa5286f2bfb51890a37b547308b8d6d93 by Benjamin Barenblat <bbaren@google.com>:

Skip floating-point edge-case tests when using an x87

32-bit Intel CPUs use 80-bit floats for intermediate values, which can
change the results of floating point computations from what we normally
expect. Identify tests that are sensitive to the x87, and skip them when
we’re on 32-bit Intel.

PiperOrigin-RevId: 378722613

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e5798bb017854e7f3b6d8721fed7dd553642b83d by Abseil Team <absl-team@google.com>:

Build without -Wl,-no-undefined.

PiperOrigin-RevId: 378690619

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3587685a2c932405e401546ec383abcfbf8495c8 by Derek Mauro <dmauro@google.com>:

Update CCTZ BUILD file.

PiperOrigin-RevId: 378688996

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06c7841b2bf8851410b716823b7ff9b42d86085e by Derek Mauro <dmauro@google.com>:

Change the CMake install test to use installed version of GoogleTest

PiperOrigin-RevId: 378537383

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eaa8122a7062c56bed80e806344cca0c8325bf6f by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 378525523

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381f505cce894b8eec031a541855650c4aa46e64 by Abseil Team <absl-team@google.com>:

Mark btree_container::clear() with the ABSL_ATTRIBUTE_REINITIALIZES attribute.

This prevents false positives in the clang-tidy check bugprone-use-after-move;
it allows clear() to be called on a moved-from btree_container without any
warnings, and the btree_container will thereafter be regarded as initialized again.

PiperOrigin-RevId: 378472690
GitOrigin-RevId: ca5ce10fa5286f2bfb51890a37b547308b8d6d93
Change-Id: I4267246f418538c5baacb562d1a40213fb13f246

4 files changed, 38 insertions, 0 deletions

diff --git a/absl/random/beta_distribution_test.cc b/absl/random/beta_distribution_test.cc
index 44cdfdd0..d980c969 100644
--- a/absl/random/beta_distribution_test.cc
+++ b/absl/random/beta_distribution_test.cc
@@ -15,6 +15,7 @@
 #include "absl/random/beta_distribution.h"
 
 #include <algorithm>
+#include <cfloat>
 #include <cstddef>
 #include <cstdint>
 #include <iterator>
@@ -558,6 +559,14 @@ TEST(BetaDistributionTest, StabilityTest) {
 // dependencies of the distribution change, such as RandU64ToDouble, then this
 // is also likely to change.
 TEST(BetaDistributionTest, AlgorithmBounds) {
+#if (defined(__i386__) || defined(_M_IX86)) && FLT_EVAL_METHOD != 0
+  // We're using an x87-compatible FPU, and intermediate operations are
+  // performed with 80-bit floats. This produces slightly different results from
+  // what we expect below.
+  GTEST_SKIP()
+      << "Skipping the test because we detected x87 floating-point semantics";
+#endif
+
   {
     absl::random_internal::sequence_urbg urbg(
         {0x7fbe76c8b4395800ull, 0x8000000000000000ull});
diff --git a/absl/random/distributions_test.cc b/absl/random/distributions_test.cc
index 5866a072..d3a5dd75 100644
--- a/absl/random/distributions_test.cc
+++ b/absl/random/distributions_test.cc
@@ -14,6 +14,7 @@
 
 #include "absl/random/distributions.h"
 
+#include <cfloat>
 #include <cmath>
 #include <cstdint>
 #include <random>
@@ -224,6 +225,15 @@ TEST_F(RandomDistributionsTest, UniformNoBounds) {
 TEST_F(RandomDistributionsTest, UniformNonsenseRanges) {
   // The ranges used in this test are undefined behavior.
   // The results are arbitrary and subject to future changes.
+
+#if (defined(__i386__) || defined(_M_IX86)) && FLT_EVAL_METHOD != 0
+  // We're using an x87-compatible FPU, and intermediate operations can be
+  // performed with 80-bit floats. This produces slightly different results from
+  // what we expect below.
+  GTEST_SKIP()
+      << "Skipping the test because we detected x87 floating-point semantics";
+#endif
+
   absl::InsecureBitGen gen;
 
   // <uint>
diff --git a/absl/random/exponential_distribution_test.cc b/absl/random/exponential_distribution_test.cc
index af11d61c..81a5d17b 100644
--- a/absl/random/exponential_distribution_test.cc
+++ b/absl/random/exponential_distribution_test.cc
@@ -15,6 +15,7 @@
 #include "absl/random/exponential_distribution.h"
 
 #include <algorithm>
+#include <cfloat>
 #include <cmath>
 #include <cstddef>
 #include <cstdint>
@@ -384,6 +385,15 @@ TEST(ExponentialDistributionTest, StabilityTest) {
 TEST(ExponentialDistributionTest, AlgorithmBounds) {
   // Relies on absl::uniform_real_distribution, so some of these comments
   // reference that.
+
+#if (defined(__i386__) || defined(_M_IX86)) && FLT_EVAL_METHOD != 0
+  // We're using an x87-compatible FPU, and intermediate operations can be
+  // performed with 80-bit floats. This produces slightly different results from
+  // what we expect below.
+  GTEST_SKIP()
+      << "Skipping the test because we detected x87 floating-point semantics";
+#endif
+
   absl::exponential_distribution<double> dist;
 
   {
diff --git a/absl/random/uniform_real_distribution_test.cc b/absl/random/uniform_real_distribution_test.cc
index 18bcd3bc..035bd284 100644
--- a/absl/random/uniform_real_distribution_test.cc
+++ b/absl/random/uniform_real_distribution_test.cc
@@ -14,6 +14,7 @@
 
 #include "absl/random/uniform_real_distribution.h"
 
+#include <cfloat>
 #include <cmath>
 #include <cstdint>
 #include <iterator>
@@ -70,6 +71,14 @@ using RealTypes =
 TYPED_TEST_SUITE(UniformRealDistributionTest, RealTypes);
 
 TYPED_TEST(UniformRealDistributionTest, ParamSerializeTest) {
+#if (defined(__i386__) || defined(_M_IX86)) && FLT_EVAL_METHOD != 0
+  // We're using an x87-compatible FPU, and intermediate operations are
+  // performed with 80-bit floats. This produces slightly different results from
+  // what we expect below.
+  GTEST_SKIP()
+      << "Skipping the test because we detected x87 floating-point semantics";
+#endif
+
   using param_type =
       typename absl::uniform_real_distribution<TypeParam>::param_type;