diff --git a/.travis.yml b/.travis.yml
index 4e7413a4..4ec239fa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,10 +29,6 @@ matrix:
       group: deprecated-2017Q4
       compiler: gcc
       env: BUILD_TYPE=Debug VERBOSE=1 CXX_FLAGS=-std=c++11
-    - os: linux
-      group: deprecated-2017Q4
-      compiler: clang
-      env: BUILD_TYPE=Debug VERBOSE=1
     - os: linux
       group: deprecated-2017Q4
       compiler: clang
@@ -40,16 +36,9 @@ matrix:
     - os: linux
       compiler: clang
       env: BUILD_TYPE=Release VERBOSE=1 CXX_FLAGS=-std=c++11 NO_EXCEPTION=ON NO_RTTI=ON COMPILER_IS_GNUCXX=ON
-    - os: osx
-      compiler: gcc
-      env: BUILD_TYPE=Debug VERBOSE=1
     - os: osx
       compiler: gcc
       env: BUILD_TYPE=Release VERBOSE=1 CXX_FLAGS=-std=c++11
-    - os: osx
-      compiler: clang
-      env: BUILD_TYPE=Debug VERBOSE=1
-      if: type != pull_request
     - os: osx
       env: BUILD_TYPE=Release VERBOSE=1 CXX_FLAGS=-std=c++11
       if: type != pull_request
diff --git a/googlemock/include/gmock/gmock-matchers.h b/googlemock/include/gmock/gmock-matchers.h
index a7bcfc83..fa26bf9b 100644
--- a/googlemock/include/gmock/gmock-matchers.h
+++ b/googlemock/include/gmock/gmock-matchers.h
@@ -1307,9 +1307,6 @@ class StrEqualityMatcher {
 #if GTEST_HAS_ABSL
   bool MatchAndExplain(const absl::string_view& s,
                        MatchResultListener* listener) const {
-    if (s.data() == NULL) {
-      return !expect_eq_;
-    }
     // This should fail to compile if absl::string_view is used with wide
     // strings.
     const StringType& str = string(s);
@@ -1380,9 +1377,6 @@ class HasSubstrMatcher {
 #if GTEST_HAS_ABSL
   bool MatchAndExplain(const absl::string_view& s,
                        MatchResultListener* listener) const {
-    if (s.data() == NULL) {
-      return false;
-    }
     // This should fail to compile if absl::string_view is used with wide
     // strings.
     const StringType& str = string(s);
@@ -1440,9 +1434,6 @@ class StartsWithMatcher {
 #if GTEST_HAS_ABSL
   bool MatchAndExplain(const absl::string_view& s,
                        MatchResultListener* listener) const {
-    if (s.data() == NULL) {
-      return false;
-    }
     // This should fail to compile if absl::string_view is used with wide
     // strings.
     const StringType& str = string(s);
@@ -1499,9 +1490,6 @@ class EndsWithMatcher {
 #if GTEST_HAS_ABSL
   bool MatchAndExplain(const absl::string_view& s,
                        MatchResultListener* listener) const {
-    if (s.data() == NULL) {
-      return false;
-    }
     // This should fail to compile if absl::string_view is used with wide
     // strings.
     const StringType& str = string(s);
@@ -1558,7 +1546,7 @@ class MatchesRegexMatcher {
 #if GTEST_HAS_ABSL
   bool MatchAndExplain(const absl::string_view& s,
                        MatchResultListener* listener) const {
-    return s.data() && MatchAndExplain(string(s), listener);
+    return MatchAndExplain(string(s), listener);
   }
 #endif  // GTEST_HAS_ABSL
 
diff --git a/googlemock/test/gmock-matchers_test.cc b/googlemock/test/gmock-matchers_test.cc
index 4697f0bf..79eb552e 100644
--- a/googlemock/test/gmock-matchers_test.cc
+++ b/googlemock/test/gmock-matchers_test.cc
@@ -1335,6 +1335,11 @@ TEST(StrEqTest, MatchesEqualString) {
   EXPECT_TRUE(m3.Matches(absl::string_view("Hello")));
   EXPECT_FALSE(m3.Matches(absl::string_view("hello")));
   EXPECT_FALSE(m3.Matches(absl::string_view()));
+
+  Matcher<const absl::string_view&> m_empty = StrEq("");
+  EXPECT_TRUE(m_empty.Matches(absl::string_view("")));
+  EXPECT_TRUE(m_empty.Matches(absl::string_view()));
+  EXPECT_FALSE(m_empty.Matches(absl::string_view("hello")));
 #endif  // GTEST_HAS_ABSL
 }
 
@@ -1459,6 +1464,10 @@ TEST(HasSubstrTest, WorksForStringClasses) {
   const Matcher<const std::string&> m2 = HasSubstr("foo");
   EXPECT_TRUE(m2.Matches(std::string("I love food.")));
   EXPECT_FALSE(m2.Matches(std::string("tofo")));
+
+  const Matcher<std::string> m_empty = HasSubstr("");
+  EXPECT_TRUE(m_empty.Matches(std::string()));
+  EXPECT_TRUE(m_empty.Matches(std::string("not empty")));
 }
 
 // Tests that HasSubstr() works for matching C-string-typed values.
@@ -1472,6 +1481,11 @@ TEST(HasSubstrTest, WorksForCStrings) {
   EXPECT_TRUE(m2.Matches("I love food."));
   EXPECT_FALSE(m2.Matches("tofo"));
   EXPECT_FALSE(m2.Matches(NULL));
+
+  const Matcher<const char*> m_empty = HasSubstr("");
+  EXPECT_TRUE(m_empty.Matches("not empty"));
+  EXPECT_TRUE(m_empty.Matches(""));
+  EXPECT_FALSE(m_empty.Matches(NULL));
 }
 
 #if GTEST_HAS_ABSL
@@ -1489,7 +1503,8 @@ TEST(HasSubstrTest, WorksForStringViewClasses) {
 
   const Matcher<const absl::string_view&> m3 = HasSubstr("");
   EXPECT_TRUE(m3.Matches(absl::string_view("foo")));
-  EXPECT_FALSE(m3.Matches(absl::string_view()));
+  EXPECT_TRUE(m3.Matches(absl::string_view("")));
+  EXPECT_TRUE(m3.Matches(absl::string_view()));
 }
 #endif  // GTEST_HAS_ABSL
 
@@ -1713,6 +1728,13 @@ TEST(StartsWithTest, MatchesStringWithGivenPrefix) {
   EXPECT_TRUE(m2.Matches("High"));
   EXPECT_FALSE(m2.Matches("H"));
   EXPECT_FALSE(m2.Matches(" Hi"));
+
+#if GTEST_HAS_ABSL
+  const Matcher<absl::string_view> m_empty = StartsWith("");
+  EXPECT_TRUE(m_empty.Matches(absl::string_view()));
+  EXPECT_TRUE(m_empty.Matches(absl::string_view("")));
+  EXPECT_TRUE(m_empty.Matches(absl::string_view("not empty")));
+#endif  // GTEST_HAS_ABSL
 }
 
 TEST(StartsWithTest, CanDescribeSelf) {
@@ -1748,9 +1770,8 @@ TEST(EndsWithTest, MatchesStringWithGivenSuffix) {
   const Matcher<const absl::string_view&> m4 = EndsWith("");
   EXPECT_TRUE(m4.Matches("Hi"));
   EXPECT_TRUE(m4.Matches(""));
-  // Default-constructed absl::string_view should not match anything, in order
-  // to distinguish it from an empty string.
-  EXPECT_FALSE(m4.Matches(absl::string_view()));
+  EXPECT_TRUE(m4.Matches(absl::string_view()));
+  EXPECT_TRUE(m4.Matches(absl::string_view("")));
 #endif  // GTEST_HAS_ABSL
 }
 
@@ -1777,11 +1798,10 @@ TEST(MatchesRegexTest, MatchesStringMatchingGivenRegex) {
   EXPECT_TRUE(m3.Matches(absl::string_view("az")));
   EXPECT_TRUE(m3.Matches(absl::string_view("abcz")));
   EXPECT_FALSE(m3.Matches(absl::string_view("1az")));
-  // Default-constructed absl::string_view should not match anything, in order
-  // to distinguish it from an empty string.
   EXPECT_FALSE(m3.Matches(absl::string_view()));
   const Matcher<const absl::string_view&> m4 = MatchesRegex("");
-  EXPECT_FALSE(m4.Matches(absl::string_view()));
+  EXPECT_TRUE(m4.Matches(absl::string_view("")));
+  EXPECT_TRUE(m4.Matches(absl::string_view()));
 #endif  // GTEST_HAS_ABSL
 }
 
@@ -1816,11 +1836,10 @@ TEST(ContainsRegexTest, MatchesStringContainingGivenRegex) {
   EXPECT_TRUE(m3.Matches(absl::string_view("azbz")));
   EXPECT_TRUE(m3.Matches(absl::string_view("az1")));
   EXPECT_FALSE(m3.Matches(absl::string_view("1a")));
-  // Default-constructed absl::string_view should not match anything, in order
-  // to distinguish it from an empty string.
   EXPECT_FALSE(m3.Matches(absl::string_view()));
   const Matcher<const absl::string_view&> m4 = ContainsRegex("");
-  EXPECT_FALSE(m4.Matches(absl::string_view()));
+  EXPECT_TRUE(m4.Matches(absl::string_view("")));
+  EXPECT_TRUE(m4.Matches(absl::string_view()));
 #endif  // GTEST_HAS_ABSL
 }
 
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index de194491..bd1117b3 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -63,9 +63,7 @@ TEST(CommandLineFlagsTest, CanBeAccessedInCodeOnceGTestHIsIncluded) {
 #include <map>
 #include <vector>
 #include <ostream>
-#if GTEST_LANG_CXX11
 #include <unordered_set>
-#endif  // GTEST_LANG_CXX11
 
 #include "gtest/gtest-spi.h"
 #include "src/gtest-internal-inl.h"
@@ -5165,8 +5163,7 @@ TEST(AssertionResultTest, CanStreamOstreamManipulators) {
   EXPECT_STREQ("Data\n\\0Will be visible", r.message());
 }
 
-// The next test uses explicit conversion operators -- a C++11 feature.
-#if GTEST_LANG_CXX11
+// The next test uses explicit conversion operators
 
 TEST(AssertionResultTest, ConstructibleFromContextuallyConvertibleToBool) {
   struct ExplicitlyConvertibleToBool {
@@ -5179,8 +5176,6 @@ TEST(AssertionResultTest, ConstructibleFromContextuallyConvertibleToBool) {
   EXPECT_TRUE(v2);
 }
 
-#endif  // GTEST_LANG_CXX11
-
 struct ConvertibleToAssertionResult {
   operator AssertionResult() const { return AssertionResult(true); }
 };
@@ -7564,7 +7559,6 @@ TEST(IsContainerTestTest, WorksForContainer) {
             sizeof(IsContainerTest<std::map<int, double> >(0)));
 }
 
-#if GTEST_LANG_CXX11
 struct ConstOnlyContainerWithPointerIterator {
   using const_iterator = int*;
   const_iterator begin() const;
@@ -7586,7 +7580,6 @@ TEST(IsContainerTestTest, ConstOnlyContainer) {
   EXPECT_EQ(sizeof(IsContainer),
             sizeof(IsContainerTest<ConstOnlyContainerWithClassIterator>(0)));
 }
-#endif  // GTEST_LANG_CXX11
 
 // Tests IsHashTable.
 struct AHashTable {
@@ -7599,10 +7592,8 @@ struct NotReallyAHashTable {
 TEST(IsHashTable, Basic) {
   EXPECT_TRUE(testing::internal::IsHashTable<AHashTable>::value);
   EXPECT_FALSE(testing::internal::IsHashTable<NotReallyAHashTable>::value);
-#if GTEST_LANG_CXX11
   EXPECT_FALSE(testing::internal::IsHashTable<std::vector<int>>::value);
   EXPECT_TRUE(testing::internal::IsHashTable<std::unordered_set<int>>::value);
-#endif  // GTEST_LANG_CXX11
 #if GTEST_HAS_HASH_SET_
   EXPECT_TRUE(testing::internal::IsHashTable<__gnu_cxx::hash_set<int>>::value);
 #endif  // GTEST_HAS_HASH_SET_