diff --git a/CMake/AbseilHelpers.cmake b/CMake/AbseilHelpers.cmake
index 8b2925c..e63db3a 100644
--- a/CMake/AbseilHelpers.cmake
+++ b/CMake/AbseilHelpers.cmake
@@ -137,6 +137,45 @@
     set(_build_type "static")
   endif()
 
+  # Generate a pkg-config file for every library:
+  if(${_build_type} STREQUAL "static" OR ${_build_type} STREQUAL "shared")
+    if(NOT ABSL_CC_LIB_TESTONLY)
+      if(absl_VERSION)
+        set(PC_VERSION "${absl_VERSION}")
+      else()
+        set(PC_VERSION "head")
+      endif()
+      foreach(dep ${ABSL_CC_LIB_DEPS})
+        if(${dep} MATCHES "^absl::(.*)")
+          set(PC_DEPS "${PC_DEPS} absl_${CMAKE_MATCH_1} = ${PC_VERSION}")
+        endif()
+      endforeach()
+      foreach(cflag ${ABSL_CC_LIB_COPTS})
+        if(${cflag} MATCHES "^(-Wno|/wd)")
+          # These flags are needed to suppress warnings that might fire in our headers.
+          set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
+        elseif(${cflag} MATCHES "^(-W|/w[1234eo])")
+          # Don't impose our warnings on others.
+        else()
+          set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
+        endif()
+      endforeach()
+      FILE(GENERATE OUTPUT "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig/absl_${_NAME}.pc" CONTENT "\
+prefix=${CMAKE_INSTALL_PREFIX}\n\
+exec_prefix=\${prefix}\n\
+libdir=\${prefix}/lib\n\
+includedir=\${prefix}/include\n\
+\n\
+Name: absl_${_NAME}\n\
+Description: Abseil ${_NAME} library\n\
+URL: https://abseil.io/\n\
+Version: ${PC_VERSION}\n\
+Requires.private:${PC_DEPS}\n\
+Libs: -L\${libdir} $<JOIN:${ABSL_CC_LIB_LINKOPTS}, > $<$<NOT:$<BOOL:${ABSL_CC_LIB_IS_INTERFACE}>>:-labsl_${_NAME}>\n\
+Cflags: -I\${includedir}${PC_CFLAGS}\n")
+    endif()
+  endif()
+
   if(NOT ABSL_CC_LIB_IS_INTERFACE)
     if(${_build_type} STREQUAL "dll_dep")
       # This target depends on the DLL. When adding dependencies to this target,
diff --git a/CMake/Googletest/CMakeLists.txt.in b/CMake/Googletest/CMakeLists.txt.in
index 994dac0..5769e3a 100644
--- a/CMake/Googletest/CMakeLists.txt.in
+++ b/CMake/Googletest/CMakeLists.txt.in
@@ -3,24 +3,12 @@
 project(googletest-external NONE)
 
 include(ExternalProject)
-if(${ABSL_USE_GOOGLETEST_HEAD})
-  ExternalProject_Add(googletest
-    GIT_REPOSITORY    https://github.com/google/googletest.git
-    GIT_TAG           master
-    SOURCE_DIR        "${absl_gtest_src_dir}"
-    BINARY_DIR        "${absl_gtest_build_dir}"
-    CONFIGURE_COMMAND ""
-    BUILD_COMMAND     ""
-    INSTALL_COMMAND   ""
-    TEST_COMMAND      ""
-  )
-else()
-  ExternalProject_Add(googletest
-    SOURCE_DIR        "${absl_gtest_src_dir}"
-    BINARY_DIR        "${absl_gtest_build_dir}"
-    CONFIGURE_COMMAND ""
-    BUILD_COMMAND     ""
-    INSTALL_COMMAND   ""
-    TEST_COMMAND      ""
-  )
-endif()
\ No newline at end of file
+ExternalProject_Add(googletest
+  URL               "${absl_gtest_download_url}"  # May be empty
+  SOURCE_DIR        "${absl_gtest_src_dir}"
+  BINARY_DIR        "${absl_gtest_build_dir}"
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND     ""
+  INSTALL_COMMAND   ""
+  TEST_COMMAND      ""
+)
diff --git a/CMake/install_test_project/test.sh b/CMake/install_test_project/test.sh
index 99989b0..ddc7726 100755
--- a/CMake/install_test_project/test.sh
+++ b/CMake/install_test_project/test.sh
@@ -118,6 +118,24 @@
   exit 1
 fi
 
+pushd "${HOME}"
+cat > hello-abseil.cc << EOF
+#include <cstdlib>
+
+#include "absl/strings/str_format.h"
+
+int main(int argc, char **argv) {
+  absl::PrintF("Hello Abseil!\n");
+  return EXIT_SUCCESS;
+}
+EOF
+export PKG_CONFIG_PATH="${install_dir}/${libdir}/pkgconfig"
+pc_args=($(pkg-config --cflags --libs --static absl_str_format))
+g++ -static -o hello-abseil hello-abseil.cc "${pc_args[@]}"
+hello="$(./hello-abseil)"
+[[ "${hello}" == "Hello Abseil!" ]]
+popd
+
 uninstall_absl
 popd
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bc195e0..c1ae8d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -95,12 +95,13 @@
 option(ABSL_USE_EXTERNAL_GOOGLETEST
   "If ON, Abseil will assume that the targets for GoogleTest are already provided by the including project. This makes sense when Abseil is used with add_subproject." OFF)
 
-
 option(ABSL_USE_GOOGLETEST_HEAD
-  "If ON, abseil will download HEAD from googletest at config time." OFF)
+  "If ON, abseil will download HEAD from GoogleTest at config time." OFF)
+
+set(ABSL_GOOGLETEST_DOWNLOAD_URL "" CACHE STRING "If set, download GoogleTest from this URL")
 
 set(ABSL_LOCAL_GOOGLETEST_DIR "/usr/src/googletest" CACHE PATH
-  "If ABSL_USE_GOOGLETEST_HEAD is OFF, specifies the directory of a local googletest checkout."
+  "If ABSL_USE_GOOGLETEST_HEAD is OFF and ABSL_GOOGLETEST_URL is not set, specifies the directory of a local GoogleTest checkout."
   )
 
 option(ABSL_RUN_TESTS "If ON, Abseil tests will be run." OFF)
@@ -113,7 +114,15 @@
   ## check targets
   if (NOT ABSL_USE_EXTERNAL_GOOGLETEST)
     set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build)
-    if(${ABSL_USE_GOOGLETEST_HEAD})
+    if(ABSL_USE_GOOGLETEST_HEAD AND ABSL_GOOGLETEST_DOWNLOAD_URL)
+      message(FATAL_ERROR "Do not set both ABSL_USE_GOOGLETEST_HEAD and ABSL_GOOGLETEST_DOWNLOAD_URL")
+    endif()
+    if(ABSL_USE_GOOGLETEST_HEAD)
+      set(absl_gtest_download_url "https://github.com/google/googletest/archive/master.zip")
+    elseif(ABSL_GOOGLETEST_DOWNLOAD_URL)
+      set(absl_gtest_download_url ${ABSL_GOOGLETEST_DOWNLOAD_URL})
+    endif()
+    if(absl_gtest_download_url)
       set(absl_gtest_src_dir ${CMAKE_BINARY_DIR}/googletest-src)
     else()
       set(absl_gtest_src_dir ${ABSL_LOCAL_GOOGLETEST_DIR})
diff --git a/README.chromium b/README.chromium
index 24681db..351b9ad 100644
--- a/README.chromium
+++ b/README.chromium
@@ -4,7 +4,7 @@
 License: Apache 2.0
 License File: LICENSE
 Version: 0
-Revision: 4b915e70929ca2d6152240facc83d3d38c5d5f28
+Revision: 962b067540f511070b7afa4cda465233b42b560a
 Security Critical: yes
 
 Description:
diff --git a/WORKSPACE b/WORKSPACE
index 0b53356..ed90d2b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -20,6 +20,7 @@
 # GoogleTest/GoogleMock framework. Used by most unit-tests.
 http_archive(
     name = "com_google_googletest",
+    # Keep this URL in sync with ABSL_GOOGLETEST_COMMIT in ci/cmake_common.sh.
     urls = ["https://github.com/google/googletest/archive/8567b09290fe402cf01923e2131c5635b8ed851b.zip"],  # 2020-06-12T22:24:28Z
     strip_prefix = "googletest-8567b09290fe402cf01923e2131c5635b8ed851b",
     sha256 = "9a8a166eb6a56c7b3d7b19dc2c946fe4778fd6f21c7a12368ad3b836d8f1be48",
diff --git a/absl/base/internal/thread_identity.h b/absl/base/internal/thread_identity.h
index ceb109b..c61d1fe 100644
--- a/absl/base/internal/thread_identity.h
+++ b/absl/base/internal/thread_identity.h
@@ -32,6 +32,7 @@
 
 #include "absl/base/config.h"
 #include "absl/base/internal/per_thread_tls.h"
+#include "absl/base/optimization.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
@@ -69,30 +70,28 @@
                          // is using this PerThreadSynch as a terminator.  Its
                          // skip field must not be filled in because the loop
                          // might then skip over the terminator.
-
-  // The wait parameters of the current wait.  waitp is null if the
-  // thread is not waiting. Transitions from null to non-null must
-  // occur before the enqueue commit point (state = kQueued in
-  // Enqueue() and CondVarEnqueue()). Transitions from non-null to
-  // null must occur after the wait is finished (state = kAvailable in
-  // Mutex::Block() and CondVar::WaitCommon()). This field may be
-  // changed only by the thread that describes this PerThreadSynch.  A
-  // special case is Fer(), which calls Enqueue() on another thread,
-  // but with an identical SynchWaitParams pointer, thus leaving the
-  // pointer unchanged.
-  SynchWaitParams *waitp;
-
-  bool suppress_fatal_errors;  // If true, try to proceed even in the face of
-                               // broken invariants.  This is used within fatal
-                               // signal handlers to improve the chances of
-                               // debug logging information being output
-                               // successfully.
-
-  intptr_t readers;     // Number of readers in mutex.
-  int priority;         // Priority of thread (updated every so often).
-
-  // When priority will next be read (cycles).
-  int64_t next_priority_read_cycles;
+  bool wake;             // This thread is to be woken from a Mutex.
+  // If "x" is on a waiter list for a mutex, "x->cond_waiter" is true iff the
+  // waiter is waiting on the mutex as part of a CV Wait or Mutex Await.
+  //
+  // The value of "x->cond_waiter" is meaningless if "x" is not on a
+  // Mutex waiter list.
+  bool cond_waiter;
+  bool maybe_unlocking;  // Valid at head of Mutex waiter queue;
+                         // true if UnlockSlow could be searching
+                         // for a waiter to wake.  Used for an optimization
+                         // in Enqueue().  true is always a valid value.
+                         // Can be reset to false when the unlocker or any
+                         // writer releases the lock, or a reader fully
+                         // releases the lock.  It may not be set to false
+                         // by a reader that decrements the count to
+                         // non-zero. protected by mutex spinlock
+  bool suppress_fatal_errors;  // If true, try to proceed even in the face
+                               // of broken invariants.  This is used within
+                               // fatal signal handlers to improve the
+                               // chances of debug logging information being
+                               // output successfully.
+  int priority;                // Priority of thread (updated every so often).
 
   // State values:
   //   kAvailable: This PerThreadSynch is available.
@@ -111,30 +110,30 @@
   };
   std::atomic<State> state;
 
-  bool maybe_unlocking;  // Valid at head of Mutex waiter queue;
-                         // true if UnlockSlow could be searching
-                         // for a waiter to wake.  Used for an optimization
-                         // in Enqueue().  true is always a valid value.
-                         // Can be reset to false when the unlocker or any
-                         // writer releases the lock, or a reader fully releases
-                         // the lock.  It may not be set to false by a reader
-                         // that decrements the count to non-zero.
-                         // protected by mutex spinlock
+  // The wait parameters of the current wait.  waitp is null if the
+  // thread is not waiting. Transitions from null to non-null must
+  // occur before the enqueue commit point (state = kQueued in
+  // Enqueue() and CondVarEnqueue()). Transitions from non-null to
+  // null must occur after the wait is finished (state = kAvailable in
+  // Mutex::Block() and CondVar::WaitCommon()). This field may be
+  // changed only by the thread that describes this PerThreadSynch.  A
+  // special case is Fer(), which calls Enqueue() on another thread,
+  // but with an identical SynchWaitParams pointer, thus leaving the
+  // pointer unchanged.
+  SynchWaitParams* waitp;
 
-  bool wake;  // This thread is to be woken from a Mutex.
+  intptr_t readers;     // Number of readers in mutex.
 
-  // If "x" is on a waiter list for a mutex, "x->cond_waiter" is true iff the
-  // waiter is waiting on the mutex as part of a CV Wait or Mutex Await.
-  //
-  // The value of "x->cond_waiter" is meaningless if "x" is not on a
-  // Mutex waiter list.
-  bool cond_waiter;
+  // When priority will next be read (cycles).
+  int64_t next_priority_read_cycles;
 
   // Locks held; used during deadlock detection.
   // Allocated in Synch_GetAllLocks() and freed in ReclaimThreadIdentity().
   SynchLocksHeld *all_locks;
 };
 
+// The instances of this class are allocated in NewThreadIdentity() with an
+// alignment of PerThreadSynch::kAlignment.
 struct ThreadIdentity {
   // Must be the first member.  The Mutex implementation requires that
   // the PerThreadSynch object associated with each thread is
diff --git a/absl/container/btree_test.cc b/absl/container/btree_test.cc
index b6c11ea..9b1b643 100644
--- a/absl/container/btree_test.cc
+++ b/absl/container/btree_test.cc
@@ -1183,6 +1183,103 @@
   EXPECT_EQ(1, tmap.size());
 }
 
+}  // namespace
+
+class BtreeNodePeer {
+ public:
+  // Yields the size of a leaf node with a specific number of values.
+  template <typename ValueType>
+  constexpr static size_t GetTargetNodeSize(size_t target_values_per_node) {
+    return btree_node<
+        set_params<ValueType, std::less<ValueType>, std::allocator<ValueType>,
+                   /*TargetNodeSize=*/256,  // This parameter isn't used here.
+                   /*Multi=*/false>>::SizeWithNValues(target_values_per_node);
+  }
+
+  // Yields the number of values in a (non-root) leaf node for this btree.
+  template <typename Btree>
+  constexpr static size_t GetNumValuesPerNode() {
+    return btree_node<typename Btree::params_type>::kNodeValues;
+  }
+
+  template <typename Btree>
+  constexpr static size_t GetMaxFieldType() {
+    return std::numeric_limits<
+        typename btree_node<typename Btree::params_type>::field_type>::max();
+  }
+
+  template <typename Btree>
+  constexpr static bool UsesLinearNodeSearch() {
+    return btree_node<typename Btree::params_type>::use_linear_search::value;
+  }
+};
+
+namespace {
+
+class BtreeMapTest : public ::testing::Test {
+ public:
+  struct Key {};
+  struct Cmp {
+    template <typename T>
+    bool operator()(T, T) const {
+      return false;
+    }
+  };
+
+  struct KeyLin {
+    using absl_btree_prefer_linear_node_search = std::true_type;
+  };
+  struct CmpLin : Cmp {
+    using absl_btree_prefer_linear_node_search = std::true_type;
+  };
+
+  struct KeyBin {
+    using absl_btree_prefer_linear_node_search = std::false_type;
+  };
+  struct CmpBin : Cmp {
+    using absl_btree_prefer_linear_node_search = std::false_type;
+  };
+
+  template <typename K, typename C>
+  static bool IsLinear() {
+    return BtreeNodePeer::UsesLinearNodeSearch<absl::btree_map<K, int, C>>();
+  }
+};
+
+TEST_F(BtreeMapTest, TestLinearSearchPreferredForKeyLinearViaAlias) {
+  // Test requesting linear search by directly exporting an alias.
+  EXPECT_FALSE((IsLinear<Key, Cmp>()));
+  EXPECT_TRUE((IsLinear<KeyLin, Cmp>()));
+  EXPECT_TRUE((IsLinear<Key, CmpLin>()));
+  EXPECT_TRUE((IsLinear<KeyLin, CmpLin>()));
+}
+
+TEST_F(BtreeMapTest, LinearChoiceTree) {
+  // Cmp has precedence, and is forcing binary
+  EXPECT_FALSE((IsLinear<Key, CmpBin>()));
+  EXPECT_FALSE((IsLinear<KeyLin, CmpBin>()));
+  EXPECT_FALSE((IsLinear<KeyBin, CmpBin>()));
+  EXPECT_FALSE((IsLinear<int, CmpBin>()));
+  EXPECT_FALSE((IsLinear<std::string, CmpBin>()));
+  // Cmp has precedence, and is forcing linear
+  EXPECT_TRUE((IsLinear<Key, CmpLin>()));
+  EXPECT_TRUE((IsLinear<KeyLin, CmpLin>()));
+  EXPECT_TRUE((IsLinear<KeyBin, CmpLin>()));
+  EXPECT_TRUE((IsLinear<int, CmpLin>()));
+  EXPECT_TRUE((IsLinear<std::string, CmpLin>()));
+  // Cmp has no preference, Key determines linear vs binary.
+  EXPECT_FALSE((IsLinear<Key, Cmp>()));
+  EXPECT_TRUE((IsLinear<KeyLin, Cmp>()));
+  EXPECT_FALSE((IsLinear<KeyBin, Cmp>()));
+  // arithmetic key w/ std::less or std::greater: linear
+  EXPECT_TRUE((IsLinear<int, std::less<int>>()));
+  EXPECT_TRUE((IsLinear<double, std::greater<double>>()));
+  // arithmetic key w/ custom compare: binary
+  EXPECT_FALSE((IsLinear<int, Cmp>()));
+  // non-arithmetic key: binary
+  EXPECT_FALSE((IsLinear<std::string, std::less<std::string>>()));
+}
+
 TEST(Btree, BtreeMapCanHoldMoveOnlyTypes) {
   absl::btree_map<std::string, std::unique_ptr<std::string>> m;
 
@@ -1328,34 +1425,6 @@
   EXPECT_EQ(tracker.swaps(), 0);
 }
 
-}  // namespace
-
-class BtreeNodePeer {
- public:
-  // Yields the size of a leaf node with a specific number of values.
-  template <typename ValueType>
-  constexpr static size_t GetTargetNodeSize(size_t target_values_per_node) {
-    return btree_node<
-        set_params<ValueType, std::less<ValueType>, std::allocator<ValueType>,
-                   /*TargetNodeSize=*/256,  // This parameter isn't used here.
-                   /*Multi=*/false>>::SizeWithNValues(target_values_per_node);
-  }
-
-  // Yields the number of values in a (non-root) leaf node for this set.
-  template <typename Set>
-  constexpr static size_t GetNumValuesPerNode() {
-    return btree_node<typename Set::params_type>::kNodeValues;
-  }
-
-  template <typename Set>
-  constexpr static size_t GetMaxFieldType() {
-    return std::numeric_limits<
-        typename btree_node<typename Set::params_type>::field_type>::max();
-  }
-};
-
-namespace {
-
 // A btree set with a specific number of values per node.
 template <typename Key, int TargetValuesPerNode, typename Cmp = std::less<Key>>
 class SizedBtreeSet
@@ -2611,6 +2680,12 @@
   int i2;
 };
 
+bool operator==(const MultiKey a, const MultiKey b) {
+  return a.i1 == b.i1 && a.i2 == b.i2;
+}
+
+// A heterogeneous comparator that has different equivalence classes for
+// different lookup types.
 struct MultiKeyComp {
   using is_transparent = void;
   bool operator()(const MultiKey a, const MultiKey b) const {
@@ -2621,8 +2696,6 @@
   bool operator()(const MultiKey a, const int b) const { return a.i1 < b; }
 };
 
-// Test that when there's a heterogeneous comparator that behaves differently
-// for some heterogeneous operators, we get equal_range() right.
 TEST(Btree, MultiKeyEqualRange) {
   absl::btree_set<MultiKey, MultiKeyComp> set;
 
@@ -2640,6 +2713,114 @@
   }
 }
 
+TEST(Btree, MultiKeyErase) {
+  absl::btree_set<MultiKey, MultiKeyComp> set = {
+      {1, 1}, {2, 1}, {2, 2}, {3, 1}};
+  EXPECT_EQ(set.erase(2), 2);
+  EXPECT_THAT(set, ElementsAre(MultiKey{1, 1}, MultiKey{3, 1}));
+}
+
+TEST(Btree, MultiKeyCount) {
+  const absl::btree_set<MultiKey, MultiKeyComp> set = {
+      {1, 1}, {2, 1}, {2, 2}, {3, 1}};
+  EXPECT_EQ(set.count(2), 2);
+}
+
+TEST(Btree, AllocConstructor) {
+  using Alloc = CountingAllocator<int>;
+  using Set = absl::btree_set<int, std::less<int>, Alloc>;
+  int64_t bytes_used = 0;
+  Alloc alloc(&bytes_used);
+  Set set(alloc);
+
+  set.insert({1, 2, 3});
+
+  EXPECT_THAT(set, ElementsAre(1, 2, 3));
+  EXPECT_GT(bytes_used, set.size() * sizeof(int));
+}
+
+TEST(Btree, AllocInitializerListConstructor) {
+  using Alloc = CountingAllocator<int>;
+  using Set = absl::btree_set<int, std::less<int>, Alloc>;
+  int64_t bytes_used = 0;
+  Alloc alloc(&bytes_used);
+  Set set({1, 2, 3}, alloc);
+
+  EXPECT_THAT(set, ElementsAre(1, 2, 3));
+  EXPECT_GT(bytes_used, set.size() * sizeof(int));
+}
+
+TEST(Btree, AllocRangeConstructor) {
+  using Alloc = CountingAllocator<int>;
+  using Set = absl::btree_set<int, std::less<int>, Alloc>;
+  int64_t bytes_used = 0;
+  Alloc alloc(&bytes_used);
+  std::vector<int> v = {1, 2, 3};
+  Set set(v.begin(), v.end(), alloc);
+
+  EXPECT_THAT(set, ElementsAre(1, 2, 3));
+  EXPECT_GT(bytes_used, set.size() * sizeof(int));
+}
+
+TEST(Btree, AllocCopyConstructor) {
+  using Alloc = CountingAllocator<int>;
+  using Set = absl::btree_set<int, std::less<int>, Alloc>;
+  int64_t bytes_used1 = 0;
+  Alloc alloc1(&bytes_used1);
+  Set set1(alloc1);
+
+  set1.insert({1, 2, 3});
+
+  int64_t bytes_used2 = 0;
+  Alloc alloc2(&bytes_used2);
+  Set set2(set1, alloc2);
+
+  EXPECT_THAT(set1, ElementsAre(1, 2, 3));
+  EXPECT_THAT(set2, ElementsAre(1, 2, 3));
+  EXPECT_GT(bytes_used1, set1.size() * sizeof(int));
+  EXPECT_EQ(bytes_used1, bytes_used2);
+}
+
+TEST(Btree, AllocMoveConstructor_SameAlloc) {
+  using Alloc = CountingAllocator<int>;
+  using Set = absl::btree_set<int, std::less<int>, Alloc>;
+  int64_t bytes_used = 0;
+  Alloc alloc(&bytes_used);
+  Set set1(alloc);
+
+  set1.insert({1, 2, 3});
+
+  const int64_t original_bytes_used = bytes_used;
+  EXPECT_GT(original_bytes_used, set1.size() * sizeof(int));
+
+  Set set2(std::move(set1), alloc);
+
+  EXPECT_THAT(set2, ElementsAre(1, 2, 3));
+  EXPECT_EQ(bytes_used, original_bytes_used);
+}
+
+TEST(Btree, AllocMoveConstructor_DifferentAlloc) {
+  using Alloc = CountingAllocator<int>;
+  using Set = absl::btree_set<int, std::less<int>, Alloc>;
+  int64_t bytes_used1 = 0;
+  Alloc alloc1(&bytes_used1);
+  Set set1(alloc1);
+
+  set1.insert({1, 2, 3});
+
+  const int64_t original_bytes_used = bytes_used1;
+  EXPECT_GT(original_bytes_used, set1.size() * sizeof(int));
+
+  int64_t bytes_used2 = 0;
+  Alloc alloc2(&bytes_used2);
+  Set set2(std::move(set1), alloc2);
+
+  EXPECT_THAT(set2, ElementsAre(1, 2, 3));
+  // We didn't free these bytes allocated by `set1` yet.
+  EXPECT_EQ(bytes_used1, original_bytes_used);
+  EXPECT_EQ(bytes_used2, original_bytes_used);
+}
+
 }  // namespace
 }  // namespace container_internal
 ABSL_NAMESPACE_END
diff --git a/absl/container/internal/btree.h b/absl/container/internal/btree.h
index 55d6957..f2fc31d 100644
--- a/absl/container/internal/btree.h
+++ b/absl/container/internal/btree.h
@@ -182,6 +182,38 @@
   using type = StringBtreeDefaultGreater;
 };
 
+// Detects an 'absl_btree_prefer_linear_node_search' member. This is
+// a protocol used as an opt-in or opt-out of linear search.
+//
+//  For example, this would be useful for key types that wrap an integer
+//  and define their own cheap operator<(). For example:
+//
+//   class K {
+//    public:
+//     using absl_btree_prefer_linear_node_search = std::true_type;
+//     ...
+//    private:
+//     friend bool operator<(K a, K b) { return a.k_ < b.k_; }
+//     int k_;
+//   };
+//
+//   btree_map<K, V> m;  // Uses linear search
+//
+// If T has the preference tag, then it has a preference.
+// Btree will use the tag's truth value.
+template <typename T, typename = void>
+struct has_linear_node_search_preference : std::false_type {};
+template <typename T, typename = void>
+struct prefers_linear_node_search : std::false_type {};
+template <typename T>
+struct has_linear_node_search_preference<
+    T, absl::void_t<typename T::absl_btree_prefer_linear_node_search>>
+    : std::true_type {};
+template <typename T>
+struct prefers_linear_node_search<
+    T, absl::void_t<typename T::absl_btree_prefer_linear_node_search>>
+    : T::absl_btree_prefer_linear_node_search {};
+
 template <typename Key, typename Compare, typename Alloc, int TargetNodeSize,
           bool Multi, typename SlotPolicy>
 struct common_params {
@@ -391,6 +423,7 @@
 // useful information.
 template <typename V>
 struct SearchResult<V, false> {
+  SearchResult() {}
   explicit SearchResult(V value) : value(value) {}
   SearchResult(V value, MatchKind /*match*/) : value(value) {}
 
@@ -424,15 +457,22 @@
   using difference_type = typename Params::difference_type;
 
   // Btree decides whether to use linear node search as follows:
+  //   - If the comparator expresses a preference, use that.
+  //   - If the key expresses a preference, use that.
   //   - If the key is arithmetic and the comparator is std::less or
   //     std::greater, choose linear.
   //   - Otherwise, choose binary.
   // TODO(ezb): Might make sense to add condition(s) based on node-size.
   using use_linear_search = std::integral_constant<
       bool,
-                std::is_arithmetic<key_type>::value &&
-                    (std::is_same<std::less<key_type>, key_compare>::value ||
-                     std::is_same<std::greater<key_type>, key_compare>::value)>;
+      has_linear_node_search_preference<key_compare>::value
+          ? prefers_linear_node_search<key_compare>::value
+          : has_linear_node_search_preference<key_type>::value
+                ? prefers_linear_node_search<key_type>::value
+                : std::is_arithmetic<key_type>::value &&
+                      (std::is_same<std::less<key_type>, key_compare>::value ||
+                       std::is_same<std::greater<key_type>,
+                                    key_compare>::value)>;
 
   // This class is organized by gtl::Layout as if it had the following
   // structure:
@@ -803,12 +843,6 @@
   // Deletes a node and all of its children.
   static void clear_and_delete(btree_node *node, allocator_type *alloc);
 
- public:
-  // Exposed only for tests.
-  static bool testonly_uses_linear_node_search() {
-    return use_linear_search::value;
-  }
-
  private:
   template <typename... Args>
   void value_init(const field_type i, allocator_type *alloc, Args &&... args) {
@@ -1108,21 +1142,35 @@
   // before this method is called. This method is used in copy construction,
   // copy assignment, and move assignment.
   template <typename Btree>
-  void copy_or_move_values_in_order(Btree *other);
+  void copy_or_move_values_in_order(Btree &other);
 
   // Validates that various assumptions/requirements are true at compile time.
   constexpr static bool static_assert_validation();
 
  public:
-  btree(const key_compare &comp, const allocator_type &alloc);
+  btree(const key_compare &comp, const allocator_type &alloc)
+      : root_(comp, alloc, EmptyNode()), rightmost_(EmptyNode()), size_(0) {}
 
-  btree(const btree &other);
+  btree(const btree &other) : btree(other, other.allocator()) {}
+  btree(const btree &other, const allocator_type &alloc)
+      : btree(other.key_comp(), alloc) {
+    copy_or_move_values_in_order(other);
+  }
   btree(btree &&other) noexcept
       : root_(std::move(other.root_)),
         rightmost_(absl::exchange(other.rightmost_, EmptyNode())),
         size_(absl::exchange(other.size_, 0)) {
     other.mutable_root() = EmptyNode();
   }
+  btree(btree &&other, const allocator_type &alloc)
+      : btree(other.key_comp(), alloc) {
+    if (alloc == other.allocator()) {
+      swap(other);
+    } else {
+      // Move values from `other` one at a time when allocators are different.
+      copy_or_move_values_in_order(other);
+    }
+  }
 
   ~btree() {
     // Put static_asserts in destructor to avoid triggering them before the type
@@ -1153,11 +1201,11 @@
   // Finds the first element whose key is not less than key.
   template <typename K>
   iterator lower_bound(const K &key) {
-    return internal_end(internal_lower_bound(key));
+    return internal_end(internal_lower_bound(key).value);
   }
   template <typename K>
   const_iterator lower_bound(const K &key) const {
-    return internal_end(internal_lower_bound(key));
+    return internal_end(internal_lower_bound(key).value);
   }
 
   // Finds the first element whose key is greater than key.
@@ -1242,16 +1290,6 @@
   // to the element after the last erased element.
   std::pair<size_type, iterator> erase_range(iterator begin, iterator end);
 
-  // Erases the specified key from the btree. Returns 1 if an element was
-  // erased and 0 otherwise.
-  template <typename K>
-  size_type erase_unique(const K &key);
-
-  // Erases all of the entries matching the specified key from the
-  // btree. Returns the number of elements erased.
-  template <typename K>
-  size_type erase_multi(const K &key);
-
   // Finds the iterator corresponding to a key or returns end() if the key is
   // not present.
   template <typename K>
@@ -1263,23 +1301,6 @@
     return internal_end(internal_find(key));
   }
 
-  // Returns a count of the number of times the key appears in the btree.
-  template <typename K>
-  size_type count_unique(const K &key) const {
-    const iterator begin = internal_find(key);
-    if (begin.node == nullptr) {
-      // The key doesn't exist in the tree.
-      return 0;
-    }
-    return 1;
-  }
-  // Returns a count of the number of times the key appears in the btree.
-  template <typename K>
-  size_type count_multi(const K &key) const {
-    const auto range = equal_range(key);
-    return std::distance(range.first, range.second);
-  }
-
   // Clear the btree, deleting all of the values it contains.
   void clear();
 
@@ -1467,7 +1488,8 @@
 
   // Internal routine which implements lower_bound().
   template <typename K>
-  iterator internal_lower_bound(const K &key) const;
+  SearchResult<iterator, is_key_compare_to::value> internal_lower_bound(
+      const K &key) const;
 
   // Internal routine which implements upper_bound().
   template <typename K>
@@ -1496,13 +1518,6 @@
     return res;
   }
 
- public:
-  // Exposed only for tests.
-  static bool testonly_uses_linear_node_search() {
-    return node_type::testonly_uses_linear_node_search();
-  }
-
- private:
   // We use compressed tuple in order to save space because key_compare and
   // allocator_type are usually empty.
   absl::container_internal::CompressedTuple<key_compare, allocator_type,
@@ -1825,7 +1840,7 @@
 // btree methods
 template <typename P>
 template <typename Btree>
-void btree<P>::copy_or_move_values_in_order(Btree *other) {
+void btree<P>::copy_or_move_values_in_order(Btree &other) {
   static_assert(std::is_same<btree, Btree>::value ||
                     std::is_same<const btree, Btree>::value,
                 "Btree type must be same or const.");
@@ -1833,11 +1848,11 @@
 
   // We can avoid key comparisons because we know the order of the
   // values is the same order we'll store them in.
-  auto iter = other->begin();
-  if (iter == other->end()) return;
+  auto iter = other.begin();
+  if (iter == other.end()) return;
   insert_multi(maybe_move_from_iterator(iter));
   ++iter;
-  for (; iter != other->end(); ++iter) {
+  for (; iter != other.end(); ++iter) {
     // If the btree is not empty, we can just insert the new value at the end
     // of the tree.
     internal_emplace(end(), maybe_move_from_iterator(iter));
@@ -1876,22 +1891,15 @@
 }
 
 template <typename P>
-btree<P>::btree(const key_compare &comp, const allocator_type &alloc)
-    : root_(comp, alloc, EmptyNode()), rightmost_(EmptyNode()), size_(0) {}
-
-template <typename P>
-btree<P>::btree(const btree &other)
-    : btree(other.key_comp(), other.allocator()) {
-  copy_or_move_values_in_order(&other);
-}
-
-template <typename P>
 template <typename K>
 auto btree<P>::equal_range(const K &key) -> std::pair<iterator, iterator> {
-  const iterator lower = lower_bound(key);
-  // TODO(ezb): we should be able to avoid this comparison when there's a
-  // three-way comparator.
-  if (lower == end() || compare_keys(key, lower.key())) return {lower, lower};
+  const SearchResult<iterator, is_key_compare_to::value> res =
+      internal_lower_bound(key);
+  const iterator lower = internal_end(res.value);
+  if (res.HasMatch() ? !res.IsEq()
+                     : lower == end() || compare_keys(key, lower.key())) {
+    return {lower, lower};
+  }
 
   const iterator next = std::next(lower);
   // When the comparator is heterogeneous, we can't assume that comparison with
@@ -1911,7 +1919,7 @@
   // Try once more to avoid the call to upper_bound() if there's only one
   // equivalent key. This should prevent all calls to upper_bound() in cases of
   // unique-containers with heterogeneous comparators in which all comparison
-  // operators are equivalent.
+  // operators have the same equivalence classes.
   if (next == end() || compare_keys(key, next.key())) return {lower, next};
 
   // In this case, we need to call upper_bound() to avoid worst case O(N)
@@ -2042,7 +2050,7 @@
       *mutable_allocator() = other.allocator();
     }
 
-    copy_or_move_values_in_order(&other);
+    copy_or_move_values_in_order(other);
   }
   return *this;
 }
@@ -2072,7 +2080,7 @@
         // comparator while moving the values so we can't swap the key
         // comparators.
         *mutable_key_comp() = other.key_comp();
-        copy_or_move_values_in_order(&other);
+        copy_or_move_values_in_order(other);
       }
     }
   }
@@ -2196,31 +2204,6 @@
 }
 
 template <typename P>
-template <typename K>
-auto btree<P>::erase_unique(const K &key) -> size_type {
-  const iterator iter = internal_find(key);
-  if (iter.node == nullptr) {
-    // The key doesn't exist in the tree, return nothing done.
-    return 0;
-  }
-  erase(iter);
-  return 1;
-}
-
-template <typename P>
-template <typename K>
-auto btree<P>::erase_multi(const K &key) -> size_type {
-  const iterator begin = internal_lower_bound(key);
-  if (begin.node == nullptr) {
-    // The key doesn't exist in the tree, return nothing done.
-    return 0;
-  }
-  // Delete all of the keys between begin and upper_bound(key).
-  const iterator end = internal_end(internal_upper_bound(key));
-  return erase_range(begin, end).first;
-}
-
-template <typename P>
 void btree<P>::clear() {
   if (!empty()) {
     node_type::clear_and_delete(root(), mutable_allocator());
@@ -2518,16 +2501,24 @@
 
 template <typename P>
 template <typename K>
-auto btree<P>::internal_lower_bound(const K &key) const -> iterator {
+auto btree<P>::internal_lower_bound(const K &key) const
+    -> SearchResult<iterator, is_key_compare_to::value> {
   iterator iter(const_cast<node_type *>(root()));
+  SearchResult<int, is_key_compare_to::value> res;
+  bool seen_eq = false;
   for (;;) {
-    iter.position = iter.node->lower_bound(key, key_comp()).value;
+    res = iter.node->lower_bound(key, key_comp());
+    iter.position = res.value;
+    // TODO(ezb): we should be able to terminate early on IsEq() if there can't
+    // be multiple equivalent keys in container for this lookup type.
     if (iter.node->leaf()) {
       break;
     }
+    seen_eq = seen_eq || res.IsEq();
     iter.node = iter.node->child(iter.position);
   }
-  return internal_last(iter);
+  if (res.IsEq()) return {iter, MatchKind::kEq};
+  return {internal_last(iter), seen_eq ? MatchKind::kEq : MatchKind::kNe};
 }
 
 template <typename P>
diff --git a/absl/container/internal/btree_container.h b/absl/container/internal/btree_container.h
index 279024d..887eda4 100644
--- a/absl/container/internal/btree_container.h
+++ b/absl/container/internal/btree_container.h
@@ -23,6 +23,7 @@
 #include "absl/base/internal/throw_delegate.h"
 #include "absl/container/internal/btree.h"  // IWYU pragma: export
 #include "absl/container/internal/common.h"
+#include "absl/memory/memory.h"
 #include "absl/meta/type_traits.h"
 
 namespace absl {
@@ -68,8 +69,21 @@
   explicit btree_container(const key_compare &comp,
                            const allocator_type &alloc = allocator_type())
       : tree_(comp, alloc) {}
-  btree_container(const btree_container &other) = default;
-  btree_container(btree_container &&other) noexcept = default;
+  explicit btree_container(const allocator_type &alloc)
+      : tree_(key_compare(), alloc) {}
+
+  btree_container(const btree_container &other)
+      : btree_container(other, absl::allocator_traits<allocator_type>::
+                                   select_on_container_copy_construction(
+                                       other.get_allocator())) {}
+  btree_container(const btree_container &other, const allocator_type &alloc)
+      : tree_(other.tree_, alloc) {}
+
+  btree_container(btree_container &&other) noexcept(
+      std::is_nothrow_move_constructible<Tree>::value) = default;
+  btree_container(btree_container &&other, const allocator_type &alloc)
+      : tree_(std::move(other.tree_), alloc) {}
+
   btree_container &operator=(const btree_container &other) = default;
   btree_container &operator=(btree_container &&other) noexcept(
       std::is_nothrow_move_assignable<Tree>::value) = default;
@@ -90,6 +104,11 @@
 
   // Lookup routines.
   template <typename K = key_type>
+  size_type count(const key_arg<K> &key) const {
+    auto equal_range = this->equal_range(key);
+    return std::distance(equal_range.first, equal_range.second);
+  }
+  template <typename K = key_type>
   iterator find(const key_arg<K> &key) {
     return tree_.find(key);
   }
@@ -138,6 +157,11 @@
   iterator erase(const_iterator first, const_iterator last) {
     return tree_.erase_range(iterator(first), iterator(last)).second;
   }
+  template <typename K = key_type>
+  size_type erase(const key_arg<K> &key) {
+    auto equal_range = this->equal_range(key);
+    return tree_.erase_range(equal_range.first, equal_range.second).first;
+  }
 
   // Extract routines.
   node_type extract(iterator position) {
@@ -234,7 +258,7 @@
   using super_type::super_type;
   btree_set_container() {}
 
-  // Range constructor.
+  // Range constructors.
   template <class InputIterator>
   btree_set_container(InputIterator b, InputIterator e,
                       const key_compare &comp = key_compare(),
@@ -242,18 +266,19 @@
       : super_type(comp, alloc) {
     insert(b, e);
   }
+  template <class InputIterator>
+  btree_set_container(InputIterator b, InputIterator e,
+                      const allocator_type &alloc)
+      : btree_set_container(b, e, key_compare(), alloc) {}
 
-  // Initializer list constructor.
+  // Initializer list constructors.
   btree_set_container(std::initializer_list<init_type> init,
                       const key_compare &comp = key_compare(),
                       const allocator_type &alloc = allocator_type())
       : btree_set_container(init.begin(), init.end(), comp, alloc) {}
-
-  // Lookup routines.
-  template <typename K = key_type>
-  size_type count(const key_arg<K> &key) const {
-    return this->tree_.count_unique(key);
-  }
+  btree_set_container(std::initializer_list<init_type> init,
+                      const allocator_type &alloc)
+      : btree_set_container(init.begin(), init.end(), alloc) {}
 
   // Insertion routines.
   std::pair<iterator, bool> insert(const value_type &v) {
@@ -312,16 +337,10 @@
     return res.first;
   }
 
-  // Deletion routines.
-  // TODO(ezb): we should support heterogeneous comparators that have different
-  // behavior for K!=key_type.
-  template <typename K = key_type>
-  size_type erase(const key_arg<K> &key) {
-    return this->tree_.erase_unique(key);
-  }
-  using super_type::erase;
-
   // Node extraction routines.
+  // TODO(ezb): when the comparator is heterogeneous and has different
+  // equivalence classes for different lookup types, we should extract the first
+  // equivalent value if there are multiple.
   template <typename K = key_type>
   node_type extract(const key_arg<K> &key) {
     auto it = this->find(key);
@@ -370,6 +389,7 @@
 class btree_map_container : public btree_set_container<Tree> {
   using super_type = btree_set_container<Tree>;
   using params_type = typename Tree::params_type;
+  friend class BtreeNodePeer;
 
  private:
   template <class K>
@@ -534,7 +554,7 @@
   using super_type::super_type;
   btree_multiset_container() {}
 
-  // Range constructor.
+  // Range constructors.
   template <class InputIterator>
   btree_multiset_container(InputIterator b, InputIterator e,
                            const key_compare &comp = key_compare(),
@@ -542,18 +562,19 @@
       : super_type(comp, alloc) {
     insert(b, e);
   }
+  template <class InputIterator>
+  btree_multiset_container(InputIterator b, InputIterator e,
+                           const allocator_type &alloc)
+      : btree_multiset_container(b, e, key_compare(), alloc) {}
 
-  // Initializer list constructor.
+  // Initializer list constructors.
   btree_multiset_container(std::initializer_list<init_type> init,
                            const key_compare &comp = key_compare(),
                            const allocator_type &alloc = allocator_type())
       : btree_multiset_container(init.begin(), init.end(), comp, alloc) {}
-
-  // Lookup routines.
-  template <typename K = key_type>
-  size_type count(const key_arg<K> &key) const {
-    return this->tree_.count_multi(key);
-  }
+  btree_multiset_container(std::initializer_list<init_type> init,
+                           const allocator_type &alloc)
+      : btree_multiset_container(init.begin(), init.end(), alloc) {}
 
   // Insertion routines.
   iterator insert(const value_type &v) { return this->tree_.insert_multi(v); }
@@ -599,14 +620,9 @@
     return res;
   }
 
-  // Deletion routines.
-  template <typename K = key_type>
-  size_type erase(const key_arg<K> &key) {
-    return this->tree_.erase_multi(key);
-  }
-  using super_type::erase;
-
   // Node extraction routines.
+  // TODO(ezb): we are supposed to extract the first equivalent key if there are
+  // multiple, but this isn't guaranteed to extract the first one.
   template <typename K = key_type>
   node_type extract(const key_arg<K> &key) {
     auto it = this->find(key);
diff --git a/absl/copts/GENERATED_AbseilCopts.cmake b/absl/copts/GENERATED_AbseilCopts.cmake
index 97bd283..beb3799 100644
--- a/absl/copts/GENERATED_AbseilCopts.cmake
+++ b/absl/copts/GENERATED_AbseilCopts.cmake
@@ -16,7 +16,6 @@
     "-Wno-extra-semi-stmt"
     "-Wno-packed"
     "-Wno-padded"
-    "-Wno-sign-compare"
     "-Wno-float-conversion"
     "-Wno-float-equal"
     "-Wno-format-nonliteral"
@@ -88,7 +87,6 @@
     "-Wvla"
     "-Wwrite-strings"
     "-Wno-missing-field-initializers"
-    "-Wno-sign-compare"
     "-DNOMINMAX"
 )
 
@@ -117,7 +115,6 @@
     "-Wno-extra-semi-stmt"
     "-Wno-packed"
     "-Wno-padded"
-    "-Wno-sign-compare"
     "-Wno-float-conversion"
     "-Wno-float-equal"
     "-Wno-format-nonliteral"
diff --git a/absl/copts/GENERATED_copts.bzl b/absl/copts/GENERATED_copts.bzl
index bcdd61e..ff729d7 100644
--- a/absl/copts/GENERATED_copts.bzl
+++ b/absl/copts/GENERATED_copts.bzl
@@ -17,7 +17,6 @@
     "-Wno-extra-semi-stmt",
     "-Wno-packed",
     "-Wno-padded",
-    "-Wno-sign-compare",
     "-Wno-float-conversion",
     "-Wno-float-equal",
     "-Wno-format-nonliteral",
@@ -89,7 +88,6 @@
     "-Wvla",
     "-Wwrite-strings",
     "-Wno-missing-field-initializers",
-    "-Wno-sign-compare",
     "-DNOMINMAX",
 ]
 
@@ -118,7 +116,6 @@
     "-Wno-extra-semi-stmt",
     "-Wno-packed",
     "-Wno-padded",
-    "-Wno-sign-compare",
     "-Wno-float-conversion",
     "-Wno-float-equal",
     "-Wno-format-nonliteral",
diff --git a/absl/copts/copts.py b/absl/copts/copts.py
index a3437c1..55b5fb1 100644
--- a/absl/copts/copts.py
+++ b/absl/copts/copts.py
@@ -41,10 +41,6 @@
     "-Wno-packed",
     "-Wno-padded",
     ###
-    # Google style does not use unsigned integers, though STL containers
-    # have unsigned types.
-    "-Wno-sign-compare",
-    ###
     "-Wno-float-conversion",
     "-Wno-float-equal",
     "-Wno-format-nonliteral",
@@ -138,9 +134,6 @@
         # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36750
         # Remove when gcc-4.x is no longer supported.
         "-Wno-missing-field-initializers",
-        # Google style does not use unsigned integers, though STL containers
-        # have unsigned types.
-        "-Wno-sign-compare",
         # Don't define min and max macros (Build on Windows using gcc)
         "-DNOMINMAX",
     ],
diff --git a/absl/debugging/symbolize_elf.inc b/absl/debugging/symbolize_elf.inc
index 7c36fd1..f4d5727 100644
--- a/absl/debugging/symbolize_elf.inc
+++ b/absl/debugging/symbolize_elf.inc
@@ -1281,7 +1281,7 @@
     const int phnum = obj->elf_header.e_phnum;
     const int phentsize = obj->elf_header.e_phentsize;
     size_t phoff = obj->elf_header.e_phoff;
-    int num_executable_load_segments = 0;
+    size_t num_executable_load_segments = 0;
     for (int j = 0; j < phnum; j++) {
       ElfW(Phdr) phdr;
       if (!ReadFromOffsetExact(obj->fd, &phdr, sizeof(phdr), phoff)) {
@@ -1342,7 +1342,7 @@
         // Note: some binaries have multiple "rx" LOAD segments. We must
         // find the right one.
         ElfW(Phdr) *phdr = nullptr;
-        for (int j = 0; j < obj->phdr.size(); j++) {
+        for (size_t j = 0; j < obj->phdr.size(); j++) {
           ElfW(Phdr) &p = obj->phdr[j];
           if (p.p_type != PT_LOAD) {
             // We only expect PT_LOADs. This must be PT_NULL that we didn't
diff --git a/absl/flags/reflection.h b/absl/flags/reflection.h
index 4ce0ab6..e6baf5d 100644
--- a/absl/flags/reflection.h
+++ b/absl/flags/reflection.h
@@ -64,7 +64,7 @@
 //   void MyFunc() {
 //    absl::FlagSaver fs;
 //    ...
-//    absl::SetFlag(FLAGS_myFlag, otherValue);
+//    absl::SetFlag(&FLAGS_myFlag, otherValue);
 //    ...
 //  } // scope of FlagSaver left, flags return to previous state
 //
diff --git a/absl/status/statusor.h b/absl/status/statusor.h
index 0bbf6ef..469d486 100644
--- a/absl/status/statusor.h
+++ b/absl/status/statusor.h
@@ -542,7 +542,7 @@
 
   // StatusOr<T>::value_or()
   //
-  // Returns the current value of `this->ok() == true`. Otherwise constructs a
+  // Returns the current value if `this->ok() == true`. Otherwise constructs a
   // value using the provided `default_value`.
   //
   // Unlike `value`, this function returns by value, copying the current value
diff --git a/absl/strings/internal/charconv_bigint_test.cc b/absl/strings/internal/charconv_bigint_test.cc
index 363bcb0..a8b9945 100644
--- a/absl/strings/internal/charconv_bigint_test.cc
+++ b/absl/strings/internal/charconv_bigint_test.cc
@@ -69,6 +69,61 @@
     // And we should have fully rotated all bits off by now:
     EXPECT_EQ(a, BigUnsigned<84>(0u));
   }
+  {
+    // Bit shifting large and small numbers by large and small offsets.
+    // Intended to exercise bounds-checking corner on ShiftLeft() (directly
+    // and under asan).
+
+    // 2**(32*84)-1
+    const BigUnsigned<84> all_bits_one(
+        "1474444211396924248063325089479706787923460402125687709454567433186613"
+        "6228083464060749874845919674257665016359189106695900028098437021384227"
+        "3285029708032466536084583113729486015826557532750465299832071590813090"
+        "2011853039837649252477307070509704043541368002938784757296893793903797"
+        "8180292336310543540677175225040919704702800559606097685920595947397024"
+        "8303316808753252115729411497720357971050627997031988036134171378490368"
+        "6008000778741115399296162550786288457245180872759047016734959330367829"
+        "5235612397427686310674725251378116268607113017720538636924549612987647"
+        "5767411074510311386444547332882472126067840027882117834454260409440463"
+        "9345147252664893456053258463203120637089916304618696601333953616715125"
+        "2115882482473279040772264257431663818610405673876655957323083702713344"
+        "4201105427930770976052393421467136557055");
+    const BigUnsigned<84> zero(0u);
+    const BigUnsigned<84> one(1u);
+    // in bounds shifts
+    for (int i = 1; i < 84*32; ++i) {
+      // shifting all_bits_one to the left should result in a smaller number,
+      // since the high bits rotate off and the low bits are replaced with
+      // zeroes.
+      BigUnsigned<84> big_shifted = all_bits_one;
+      big_shifted.ShiftLeft(i);
+      EXPECT_GT(all_bits_one, big_shifted);
+      // Shifting 1 to the left should instead result in a larger number.
+      BigUnsigned<84> small_shifted = one;
+      small_shifted.ShiftLeft(i);
+      EXPECT_LT(one, small_shifted);
+    }
+    // Shifting by zero or a negative number has no effect
+    for (int no_op_shift : {0, -1, -84 * 32, std::numeric_limits<int>::min()}) {
+      BigUnsigned<84> big_shifted = all_bits_one;
+      big_shifted.ShiftLeft(no_op_shift);
+      EXPECT_EQ(all_bits_one, big_shifted);
+      BigUnsigned<84> small_shifted = one;
+      big_shifted.ShiftLeft(no_op_shift);
+      EXPECT_EQ(one, small_shifted);
+    }
+    // Shifting by an amount greater than the number of bits should result in
+    // zero.
+    for (int out_of_bounds_shift :
+         {84 * 32, 84 * 32 + 1, std::numeric_limits<int>::max()}) {
+      BigUnsigned<84> big_shifted = all_bits_one;
+      big_shifted.ShiftLeft(out_of_bounds_shift);
+      EXPECT_EQ(zero, big_shifted);
+      BigUnsigned<84> small_shifted = one;
+      small_shifted.ShiftLeft(out_of_bounds_shift);
+      EXPECT_EQ(zero, small_shifted);
+    }
+  }
 }
 
 TEST(BigUnsigned, MultiplyByUint32) {
diff --git a/absl/strings/internal/charconv_parse.cc b/absl/strings/internal/charconv_parse.cc
index a368845..8b11868 100644
--- a/absl/strings/internal/charconv_parse.cc
+++ b/absl/strings/internal/charconv_parse.cc
@@ -246,8 +246,8 @@
 // ConsumeDigits does not protect against overflow on *out; max_digits must
 // be chosen with respect to type T to avoid the possibility of overflow.
 template <int base, typename T>
-std::size_t ConsumeDigits(const char* begin, const char* end, int max_digits,
-                          T* out, bool* dropped_nonzero_digit) {
+int ConsumeDigits(const char* begin, const char* end, int max_digits, T* out,
+                  bool* dropped_nonzero_digit) {
   if (base == 10) {
     assert(max_digits <= std::numeric_limits<T>::digits10);
   } else if (base == 16) {
@@ -282,7 +282,7 @@
     *dropped_nonzero_digit = true;
   }
   *out = accumulator;
-  return begin - original_begin;
+  return static_cast<int>(begin - original_begin);
 }
 
 // Returns true if `v` is one of the chars allowed inside parentheses following
@@ -372,7 +372,7 @@
 
   int exponent_adjustment = 0;
   bool mantissa_is_inexact = false;
-  std::size_t pre_decimal_digits = ConsumeDigits<base>(
+  int pre_decimal_digits = ConsumeDigits<base>(
       begin, end, MantissaDigitsMax<base>(), &mantissa, &mantissa_is_inexact);
   begin += pre_decimal_digits;
   int digits_left;
@@ -398,14 +398,14 @@
       while (begin < end && *begin == '0') {
         ++begin;
       }
-      std::size_t zeros_skipped = begin - begin_zeros;
+      int zeros_skipped = static_cast<int>(begin - begin_zeros);
       if (zeros_skipped >= DigitLimit<base>()) {
         // refuse to parse pathological inputs
         return result;
       }
       exponent_adjustment -= static_cast<int>(zeros_skipped);
     }
-    int64_t post_decimal_digits = ConsumeDigits<base>(
+    int post_decimal_digits = ConsumeDigits<base>(
         begin, end, digits_left, &mantissa, &mantissa_is_inexact);
     begin += post_decimal_digits;
 
diff --git a/absl/strings/internal/str_format/bind.cc b/absl/strings/internal/str_format/bind.cc
index 194e21a..4e68b90 100644
--- a/absl/strings/internal/str_format/bind.cc
+++ b/absl/strings/internal/str_format/bind.cc
@@ -235,7 +235,7 @@
     errno = sink.error();
     return -1;
   }
-  if (sink.count() > std::numeric_limits<int>::max()) {
+  if (sink.count() > static_cast<size_t>(std::numeric_limits<int>::max())) {
     errno = EFBIG;
     return -1;
   }
diff --git a/absl/strings/internal/str_format/float_conversion.cc b/absl/strings/internal/str_format/float_conversion.cc
index d3c5f0a..0ded0a6 100644
--- a/absl/strings/internal/str_format/float_conversion.cc
+++ b/absl/strings/internal/str_format/float_conversion.cc
@@ -134,7 +134,7 @@
     assert(exp > 0);
     assert(exp <= std::numeric_limits<long double>::max_exponent);
     static_assert(
-        StackArray::kMaxCapacity >=
+        static_cast<int>(StackArray::kMaxCapacity) >=
             ChunksNeeded(std::numeric_limits<long double>::max_exponent),
         "");
 
diff --git a/absl/synchronization/internal/graphcycles.cc b/absl/synchronization/internal/graphcycles.cc
index 19f9aab..27fec21 100644
--- a/absl/synchronization/internal/graphcycles.cc
+++ b/absl/synchronization/internal/graphcycles.cc
@@ -37,6 +37,7 @@
 
 #include <algorithm>
 #include <array>
+#include <limits>
 #include "absl/base/internal/hide_ptr.h"
 #include "absl/base/internal/raw_logging.h"
 #include "absl/base/internal/spinlock.h"
diff --git a/absl/time/internal/cctz/include/cctz/civil_time_detail.h b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
index d1b4222..8aadde5 100644
--- a/absl/time/internal/cctz/include/cctz/civil_time_detail.h
+++ b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
@@ -416,16 +416,10 @@
 
   // Assigning arithmetic.
   CONSTEXPR_M civil_time& operator+=(diff_t n) noexcept {
-    f_ = step(T{}, f_, n);
-    return *this;
+    return *this = *this + n;
   }
   CONSTEXPR_M civil_time& operator-=(diff_t n) noexcept {
-    if (n != (std::numeric_limits<diff_t>::min)()) {
-      f_ = step(T{}, f_, -n);
-    } else {
-      f_ = step(T{}, step(T{}, f_, -(n + 1)), 1);
-    }
-    return *this;
+    return *this = *this - n;
   }
   CONSTEXPR_M civil_time& operator++() noexcept { return *this += 1; }
   CONSTEXPR_M civil_time operator++(int) noexcept {
@@ -442,13 +436,15 @@
 
   // Binary arithmetic operators.
   friend CONSTEXPR_F civil_time operator+(civil_time a, diff_t n) noexcept {
-    return a += n;
+    return civil_time(step(T{}, a.f_, n));
   }
   friend CONSTEXPR_F civil_time operator+(diff_t n, civil_time a) noexcept {
-    return a += n;
+    return a + n;
   }
   friend CONSTEXPR_F civil_time operator-(civil_time a, diff_t n) noexcept {
-    return a -= n;
+    return n != (std::numeric_limits<diff_t>::min)()
+               ? civil_time(step(T{}, a.f_, -n))
+               : civil_time(step(T{}, step(T{}, a.f_, -(n + 1)), 1));
   }
   friend CONSTEXPR_F diff_t operator-(civil_time lhs, civil_time rhs) noexcept {
     return difference(T{}, lhs.f_, rhs.f_);
diff --git a/absl/time/internal/cctz/testdata/version b/absl/time/internal/cctz/testdata/version
index 7f680ee..b4410dc 100644
--- a/absl/time/internal/cctz/testdata/version
+++ b/absl/time/internal/cctz/testdata/version
@@ -1 +1 @@
-2020a
+2020d
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Abidjan b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Abidjan
index 28b32ab..8906e88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Abidjan
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Abidjan
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Accra b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Accra
index 697b993..9ca907b 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Accra
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Accra
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Addis_Ababa b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Addis_Ababa
index 9a2918f..d3c0bb3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Addis_Ababa
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Addis_Ababa
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Algiers b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Algiers
index ae04342..56a4dd2 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Algiers
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Algiers
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmara b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmara
index 9a2918f..d3c0bb3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmara
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmara
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmera b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmera
index 9a2918f..d3c0bb3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmera
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmera
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bamako b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bamako
index 28b32ab..8906e88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bamako
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bamako
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bangui b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bangui
index 0c80137..2f2ce2f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bangui
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bangui
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Banjul b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Banjul
index 28b32ab..8906e88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Banjul
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Banjul
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bissau b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bissau
index 82ea5aa..0da1d1e 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bissau
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bissau
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Blantyre b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Blantyre
index 52753c0..651e5cf 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Blantyre
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Blantyre
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Brazzaville b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Brazzaville
index 0c80137..2f2ce2f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Brazzaville
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Brazzaville
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bujumbura b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bujumbura
index 52753c0..651e5cf 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bujumbura
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bujumbura
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Cairo b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Cairo
index d3f8196..ea38c97 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Cairo
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Cairo
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Casablanca b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Casablanca
index d39016b..0263c90 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Casablanca
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Casablanca
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Ceuta b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Ceuta
index 850c8f0..a461dce 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Ceuta
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Ceuta
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Conakry b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Conakry
index 28b32ab..8906e88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Conakry
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Conakry
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dakar b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dakar
index 28b32ab..8906e88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dakar
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dakar
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dar_es_Salaam b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dar_es_Salaam
index 9a2918f..d3c0bb3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dar_es_Salaam
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dar_es_Salaam
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Djibouti b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Djibouti
index 9a2918f..d3c0bb3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Djibouti
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Djibouti
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Douala b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Douala
index 0c80137..2f2ce2f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Douala
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Douala
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/El_Aaiun b/absl/time/internal/cctz/testdata/zoneinfo/Africa/El_Aaiun
index 066fbed..772e23c 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/El_Aaiun
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/El_Aaiun
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Freetown b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Freetown
index 28b32ab..8906e88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Freetown
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Freetown
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Gaborone b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Gaborone
index 52753c0..651e5cf 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Gaborone
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Gaborone
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Harare b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Harare
index 52753c0..651e5cf 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Harare
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Harare
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Johannesburg b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Johannesburg
index b1c425d..bada063 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Johannesburg
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Johannesburg
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Juba b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Juba
index 625b1ac..36b0522 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Juba
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Juba
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kampala b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kampala
index 9a2918f..d3c0bb3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kampala
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kampala
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Khartoum b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Khartoum
index 8ee8cb9..3f8e44b 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Khartoum
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Khartoum
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kigali b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kigali
index 52753c0..651e5cf 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kigali
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kigali
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kinshasa b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kinshasa
index 0c80137..2f2ce2f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kinshasa
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kinshasa
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lagos b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lagos
index 0c80137..2f2ce2f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lagos
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lagos
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Libreville b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Libreville
index 0c80137..2f2ce2f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Libreville
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Libreville
Binary files differ
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lome b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lome
index 28b32ab..8906e88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lome
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Lome
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Luanda b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Luanda
index 0c80137..2f2ce2f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Africa/Luanda
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Africa/Luanda
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Galapagos b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Galapagos
index 31f0921..a9403ec 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Galapagos
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Galapagos
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Gambier b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Gambier
index e1fc3da..ddfc34f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Gambier
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Gambier
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Guadalcanal b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Guadalcanal
index 7e9d10a..720c679 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Guadalcanal
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Guam b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Guam
index 66490d2..bf9a2d9 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Honolulu b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Honolulu
index c7cd060..40e3d49 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Johnston b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Johnston
index c7cd060..40e3d49 100644
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index 7cae0cb..2f676d3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Kiritimati
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index a584aae..f5d5824 100644
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index 1a7975f..9416d52 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Kwajalein
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index 9ef8374..9228ee0 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Majuro
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index 74d6792..6ea24b7 100644
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index cb56709..001289c 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Midway
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Nauru b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Nauru
index acec042..ae13aac 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Nauru
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index 684b010..7b35793 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Niue
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Norfolk b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Norfolk
index 53c1aad..79e2a94 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Norfolk
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Noumea b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Noumea
index 931a1a3..824f814 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Noumea
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pago_Pago b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pago_Pago
index cb56709..001289c 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pago_Pago
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Palau b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Palau
index 146b351..bc8eb7a 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Palau
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index ef91b06..8a4ba4d 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pitcairn
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pitcairn
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pohnpei b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pohnpei
index c298ddd..b92b254 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pohnpei
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Pohnpei
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Ponape b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Ponape
index c298ddd..b92b254 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Ponape
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index 920ad27..5d8fc3a 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Port_Moresby
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index da6b0fa..143a188 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Rarotonga
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Saipan b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Saipan
index 66490d2..bf9a2d9 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Saipan
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index cb56709..001289c 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tahiti b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tahiti
index 442b8eb..50a064f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tahiti
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tahiti
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tarawa b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tarawa
index 3db6c75..6bc2168 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tarawa
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tarawa
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tongatapu b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tongatapu
index 5553c60..54aeb0f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tongatapu
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tongatapu
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Truk b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Truk
index 07c84b7..ea3fb5c 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Truk
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Truk
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wake b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wake
index c9e3106..71cca88 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wake
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wallis b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wallis
index b35344b..4bce893 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wallis
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Yap b/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Yap
index 07c84b7..ea3fb5c 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Yap
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Poland b/absl/time/internal/cctz/testdata/zoneinfo/Poland
index e33cf67..efe1a40 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Poland
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Portugal b/absl/time/internal/cctz/testdata/zoneinfo/Portugal
index 355817b..6484166 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Portugal
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/ROC b/absl/time/internal/cctz/testdata/zoneinfo/ROC
index 24c4344..35d89d0 100644
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index 96199e7..1755147 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Singapore b/absl/time/internal/cctz/testdata/zoneinfo/Singapore
index 2364b21..350d77e 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Turkey b/absl/time/internal/cctz/testdata/zoneinfo/Turkey
index 508446b..c891866 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/UCT b/absl/time/internal/cctz/testdata/zoneinfo/UCT
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--- a/absl/time/internal/cctz/testdata/zoneinfo/UCT
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Alaska b/absl/time/internal/cctz/testdata/zoneinfo/US/Alaska
index 9bbb2fd..cdf0572 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/US/Alaska
+++ b/absl/time/internal/cctz/testdata/zoneinfo/US/Alaska
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Aleutian b/absl/time/internal/cctz/testdata/zoneinfo/US/Aleutian
index 4323649..b1497bd 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/US/Aleutian
+++ b/absl/time/internal/cctz/testdata/zoneinfo/US/Aleutian
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Arizona b/absl/time/internal/cctz/testdata/zoneinfo/US/Arizona
index ac6bb0c..c2bd2f9 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Central b/absl/time/internal/cctz/testdata/zoneinfo/US/Central
index a5b1617..b016880 100644
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+++ b/absl/time/internal/cctz/testdata/zoneinfo/US/East-Indiana
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index 2f75480..2b6c2ee 100644
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Hawaii b/absl/time/internal/cctz/testdata/zoneinfo/US/Hawaii
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--- a/absl/time/internal/cctz/testdata/zoneinfo/US/Indiana-Starke
+++ b/absl/time/internal/cctz/testdata/zoneinfo/US/Indiana-Starke
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Michigan b/absl/time/internal/cctz/testdata/zoneinfo/US/Michigan
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Mountain b/absl/time/internal/cctz/testdata/zoneinfo/US/Mountain
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/US/Samoa b/absl/time/internal/cctz/testdata/zoneinfo/US/Samoa
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Universal b/absl/time/internal/cctz/testdata/zoneinfo/Universal
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+++ b/absl/time/internal/cctz/testdata/zoneinfo/Universal
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/W-SU b/absl/time/internal/cctz/testdata/zoneinfo/W-SU
index ddb3f4e..5e6b6de 100644
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+++ b/absl/time/internal/cctz/testdata/zoneinfo/W-SU
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/WET b/absl/time/internal/cctz/testdata/zoneinfo/WET
index c27390b..423c6c2 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/WET
+++ b/absl/time/internal/cctz/testdata/zoneinfo/WET
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diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Zulu b/absl/time/internal/cctz/testdata/zoneinfo/Zulu
index 91558be..00841a6 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Zulu
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Zulu
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diff --git a/ci/cmake_common.sh b/ci/cmake_common.sh
new file mode 100644
index 0000000..aec8a11
--- /dev/null
+++ b/ci/cmake_common.sh
@@ -0,0 +1,25 @@
+# Copyright 2020 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# The commit of GoogleTest to be used in the CMake tests in this directory.
+# Keep this in sync with the commit in the WORKSPACE file.
+readonly ABSL_GOOGLETEST_COMMIT="8567b09290fe402cf01923e2131c5635b8ed851b"
+
+# Avoid depending on GitHub by looking for a cached copy of the commit first.
+if [[ -r "${KOKORO_GFILE_DIR:-}/distdir/${ABSL_GOOGLETEST_COMMIT}.zip" ]]; then
+  DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+  ABSL_GOOGLETEST_DOWNLOAD_URL="file:///distdir/${ABSL_GOOGLETEST_COMMIT}.zip"
+else
+  ABSL_GOOGLETEST_DOWNLOAD_URL="https://github.com/google/googletest/archive/${ABSL_GOOGLETEST_COMMIT}.zip"
+fi
diff --git a/ci/cmake_install_test.sh b/ci/cmake_install_test.sh
index 78eb41d..5bf540c 100755
--- a/ci/cmake_install_test.sh
+++ b/ci/cmake_install_test.sh
@@ -20,6 +20,8 @@
   ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
 fi
 
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
 source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
 readonly DOCKER_CONTAINER=${LINUX_GCC_LATEST_CONTAINER}
 
diff --git a/ci/linux_docker_containers.sh b/ci/linux_docker_containers.sh
index 752b572..1c29d9a 100644
--- a/ci/linux_docker_containers.sh
+++ b/ci/linux_docker_containers.sh
@@ -15,7 +15,7 @@
 # The file contains Docker container identifiers currently used by test scripts.
 # Test scripts should source this file to get the identifiers.
 
-readonly LINUX_ALPINE_CONTAINER="gcr.io/google.com/absl-177019/alpine:20191016"
+readonly LINUX_ALPINE_CONTAINER="gcr.io/google.com/absl-177019/alpine:20201026"
 readonly LINUX_CLANG_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20201008"
 readonly LINUX_GCC_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20201008"
-readonly LINUX_GCC_49_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-4.9:20191018"
+readonly LINUX_GCC_FLOOR_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-floor:20201015"
diff --git a/ci/linux_gcc-4.9_libstdcxx_bazel.sh b/ci/linux_gcc-floor_libstdcxx_bazel.sh
similarity index 87%
rename from ci/linux_gcc-4.9_libstdcxx_bazel.sh
rename to ci/linux_gcc-floor_libstdcxx_bazel.sh
index 16f927b..224aef8 100755
--- a/ci/linux_gcc-4.9_libstdcxx_bazel.sh
+++ b/ci/linux_gcc-floor_libstdcxx_bazel.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Copyright 2019 The Abseil Authors.
+# Copyright 2020 The Abseil Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -37,12 +37,12 @@
 fi
 
 source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
-readonly DOCKER_CONTAINER=${LINUX_GCC_49_CONTAINER}
+readonly DOCKER_CONTAINER=${LINUX_GCC_FLOOR_CONTAINER}
 
 # USE_BAZEL_CACHE=1 only works on Kokoro.
 # Without access to the credentials this won't work.
 if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
-  DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_KEYSTORE_DIR},target=/keystore,readonly ${DOCKER_EXTRA_ARGS:-}"
+  DOCKER_EXTRA_ARGS="--volume=${KOKORO_KEYSTORE_DIR}:/keystore:ro ${DOCKER_EXTRA_ARGS:-}"
   # Bazel doesn't track changes to tools outside of the workspace
   # (e.g. /usr/bin/gcc), so by appending the docker container to the
   # remote_http_cache url, we make changes to the container part of
@@ -55,7 +55,7 @@
 # external dependencies first.
 # https://docs.bazel.build/versions/master/guide.html#distdir
 if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
-  DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+  DOCKER_EXTRA_ARGS="--volume=${KOKORO_GFILE_DIR}/distdir:/distdir:ro ${DOCKER_EXTRA_ARGS:-}"
   BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
 fi
 
@@ -64,11 +64,11 @@
     for exceptions_mode in ${EXCEPTIONS_MODE}; do
       echo "--------------------------------------------------------------------"
       time docker run \
-        --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
+        --volume="${ABSEIL_ROOT}:/abseil-cpp:ro" \
         --workdir=/abseil-cpp \
         --cap-add=SYS_PTRACE \
         --rm \
-        -e CC="/usr/bin/gcc-4.9" \
+        -e CC="/usr/local/bin/gcc" \
         -e BAZEL_CXXOPTS="-std=${std}" \
         ${DOCKER_EXTRA_ARGS:-} \
         ${DOCKER_CONTAINER} \
diff --git a/ci/linux_gcc-latest_libstdcxx_cmake.sh b/ci/linux_gcc-latest_libstdcxx_cmake.sh
index 1bf5fda..ed9cfa3 100755
--- a/ci/linux_gcc-latest_libstdcxx_cmake.sh
+++ b/ci/linux_gcc-latest_libstdcxx_cmake.sh
@@ -14,18 +14,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# TODO(absl-team): This script isn't fully hermetic because
-# -DABSL_USE_GOOGLETEST_HEAD=ON means that this script isn't pinned to a fixed
-# version of GoogleTest. This means that an upstream change to GoogleTest could
-# break this test. Fix this by allowing this script to pin to a known-good
-# version of GoogleTest.
-
 set -euox pipefail
 
 if [[ -z ${ABSEIL_ROOT:-} ]]; then
   ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
 fi
 
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
 if [[ -z ${ABSL_CMAKE_CXX_STANDARDS:-} ]]; then
   ABSL_CMAKE_CXX_STANDARDS="11 14 17 20"
 fi
@@ -46,17 +42,17 @@
     for build_shared in ${ABSL_CMAKE_BUILD_SHARED}; do
       time docker run \
         --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
-        --workdir=/abseil-cpp \
         --tmpfs=/buildfs:exec \
+        --workdir=/buildfs \
         --cap-add=SYS_PTRACE \
         --rm \
         -e CFLAGS="-Werror" \
         -e CXXFLAGS="-Werror" \
-        ${DOCKER_CONTAINER} \
+        ${DOCKER_EXTRA_ARGS:-} \
+        "${DOCKER_CONTAINER}" \
         /bin/bash -c "
-          cd /buildfs && \
           cmake /abseil-cpp \
-            -DABSL_USE_GOOGLETEST_HEAD=ON \
+            -DABSL_GOOGLETEST_DOWNLOAD_URL=${ABSL_GOOGLETEST_DOWNLOAD_URL} \
             -DABSL_RUN_TESTS=ON \
             -DBUILD_SHARED_LIBS=${build_shared} \
             -DCMAKE_BUILD_TYPE=${compilation_mode} \
diff --git a/ci/linux_gcc_alpine_cmake.sh b/ci/linux_gcc_alpine_cmake.sh
index c8f173d..31310ac 100755
--- a/ci/linux_gcc_alpine_cmake.sh
+++ b/ci/linux_gcc_alpine_cmake.sh
@@ -14,18 +14,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# TODO(absl-team): This script isn't fully hermetic because
-# -DABSL_USE_GOOGLETEST_HEAD=ON means that this script isn't pinned to a fixed
-# version of GoogleTest. This means that an upstream change to GoogleTest could
-# break this test. Fix this by allowing this script to pin to a known-good
-# version of GoogleTest.
-
 set -euox pipefail
 
 if [[ -z ${ABSEIL_ROOT:-} ]]; then
   ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
 fi
 
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
 if [[ -z ${ABSL_CMAKE_CXX_STANDARDS:-} ]]; then
   ABSL_CMAKE_CXX_STANDARDS="11 14 17"
 fi
@@ -46,17 +42,17 @@
     for build_shared in ${ABSL_CMAKE_BUILD_SHARED}; do
       time docker run \
         --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
-        --workdir=/abseil-cpp \
         --tmpfs=/buildfs:exec \
+        --workdir=/buildfs \
         --cap-add=SYS_PTRACE \
         --rm \
         -e CFLAGS="-Werror" \
         -e CXXFLAGS="-Werror" \
+        ${DOCKER_EXTRA_ARGS:-} \
         "${DOCKER_CONTAINER}" \
         /bin/sh -c "
-          cd /buildfs && \
           cmake /abseil-cpp \
-            -DABSL_USE_GOOGLETEST_HEAD=ON \
+            -DABSL_GOOGLETEST_DOWNLOAD_URL=${ABSL_GOOGLETEST_DOWNLOAD_URL} \
             -DABSL_RUN_TESTS=ON \
             -DCMAKE_BUILD_TYPE=${compilation_mode} \
             -DCMAKE_CXX_STANDARD=${std} \
diff --git a/ci/macos_xcode_cmake.sh b/ci/macos_xcode_cmake.sh
index d90e273..0847b3e 100755
--- a/ci/macos_xcode_cmake.sh
+++ b/ci/macos_xcode_cmake.sh
@@ -14,9 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# This script is invoked on Kokoro to test Abseil on macOS.
-# It is not hermetic and may break when Kokoro is updated.
-
 set -euox pipefail
 
 if [[ -z ${ABSEIL_ROOT:-} ]]; then
@@ -24,6 +21,13 @@
 fi
 ABSEIL_ROOT=$(realpath ${ABSEIL_ROOT})
 
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
+# The MacOS build doesn't run in a docker container, so we have to override ABSL_GOOGLETEST_DOWNLOAD_URL.
+if [[ -r "${KOKORO_GFILE_DIR}/distdir/${ABSL_GOOGLETEST_COMMIT}.zip" ]]; then
+  ABSL_GOOGLETEST_DOWNLOAD_URL="file://${KOKORO_GFILE_DIR}/distdir/${ABSL_GOOGLETEST_COMMIT}.zip"
+fi
+
 if [[ -z ${ABSL_CMAKE_BUILD_TYPES:-} ]]; then
   ABSL_CMAKE_BUILD_TYPES="Debug"
 fi
@@ -44,7 +48,7 @@
       -DCMAKE_BUILD_TYPE=${compilation_mode} \
       -DCMAKE_CXX_STANDARD=11 \
       -DCMAKE_MODULE_LINKER_FLAGS="-Wl,--no-undefined" \
-      -DABSL_USE_GOOGLETEST_HEAD=ON \
+      -DABSL_GOOGLETEST_DOWNLOAD_URL="${ABSL_GOOGLETEST_DOWNLOAD_URL}" \
       -DABSL_RUN_TESTS=ON
     time cmake --build .
     time ctest -C ${compilation_mode} --output-on-failure
diff --git a/roll_abseil.py b/roll_abseil.py
index cc22b73..be45967 100755
--- a/roll_abseil.py
+++ b/roll_abseil.py
@@ -78,8 +78,6 @@
 
   os.remove(os.path.join(abseil_in_chromium_dir, 'absl', 'base', 'internal', 'thread_annotations.h'))
   os.remove(os.path.join(abseil_in_chromium_dir, 'absl', 'base', 'internal', 'dynamic_annotations.h'))
-  #Chromium complains when a script file doesn't have execute permission.
-  os.chmod(os.path.join(abseil_in_chromium_dir, 'conanfile.py'), 0o750)
 
 
 def _Commit(chromium_dir, hash_diff):
diff --git a/symbols_arm64_dbg.def b/symbols_arm64_dbg.def
index ed49db5..64be068 100644
--- a/symbols_arm64_dbg.def
+++ b/symbols_arm64_dbg.def
@@ -1339,13 +1339,10 @@
     ??XDuration@absl@@QEAAAEAV01@_J@Z
     ??Xint128@absl@@QEAAAEAV01@V01@@Z
     ??Xuint128@absl@@QEAAAEAV01@V01@@Z
-    ??Y?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
-    ??Y?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??YDuration@absl@@QEAAAEAV01@V01@@Z
     ??YTime@absl@@QEAAAEAV01@VDuration@1@@Z
     ??Yint128@absl@@QEAAAEAV01@V01@@Z
     ??Yuint128@absl@@QEAAAEAV01@V01@@Z
-    ??Z?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??Z?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??ZDuration@absl@@QEAAAEAV01@V01@@Z
     ??Zint128@absl@@QEAAAEAV01@V01@@Z
diff --git a/symbols_arm64_rel.def b/symbols_arm64_rel.def
index 8d20a7d..80971b1 100644
--- a/symbols_arm64_rel.def
+++ b/symbols_arm64_rel.def
@@ -154,6 +154,8 @@
     ??BCord@absl@@QEBA?AV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@XZ
     ??Bint128@absl@@QEBANXZ
     ??EChunkIterator@Cord@absl@@QEAAAEAV012@XZ
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
     ??Hdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
     ??Kabsl@@YA?AVint128@0@V10@0@Z
     ??Kabsl@@YA?AVuint128@0@V10@0@Z
@@ -163,8 +165,6 @@
     ??XDuration@absl@@QEAAAEAV01@N@Z
     ??XDuration@absl@@QEAAAEAV01@_J@Z
     ??YDuration@absl@@QEAAAEAV01@V01@@Z
-    ??Z?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
-    ??Z?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??ZDuration@absl@@QEAAAEAV01@V01@@Z
     ??_0Duration@absl@@QEAAAEAV01@N@Z
     ??_0Duration@absl@@QEAAAEAV01@_J@Z
diff --git a/symbols_x64_dbg.def b/symbols_x64_dbg.def
index ca0a994..a6ef4bb 100644
--- a/symbols_x64_dbg.def
+++ b/symbols_x64_dbg.def
@@ -1341,13 +1341,10 @@
     ??XDuration@absl@@QEAAAEAV01@_J@Z
     ??Xint128@absl@@QEAAAEAV01@V01@@Z
     ??Xuint128@absl@@QEAAAEAV01@V01@@Z
-    ??Y?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
-    ??Y?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??YDuration@absl@@QEAAAEAV01@V01@@Z
     ??YTime@absl@@QEAAAEAV01@VDuration@1@@Z
     ??Yint128@absl@@QEAAAEAV01@V01@@Z
     ??Yuint128@absl@@QEAAAEAV01@V01@@Z
-    ??Z?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??Z?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??ZDuration@absl@@QEAAAEAV01@V01@@Z
     ??Zint128@absl@@QEAAAEAV01@V01@@Z
diff --git a/symbols_x64_rel.def b/symbols_x64_rel.def
index bd856aa..2c13ce2 100644
--- a/symbols_x64_rel.def
+++ b/symbols_x64_rel.def
@@ -155,6 +155,9 @@
     ??BCord@absl@@QEBA?AV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@XZ
     ??Bint128@absl@@QEBANXZ
     ??EChunkIterator@Cord@absl@@QEAAAEAV012@XZ
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
+    ??Hdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
     ??Kabsl@@YA?AVint128@0@V10@0@Z
     ??Kabsl@@YA?AVuint128@0@V10@0@Z
     ??Labsl@@YA?AVint128@0@V10@0@Z
@@ -163,8 +166,6 @@
     ??XDuration@absl@@QEAAAEAV01@N@Z
     ??XDuration@absl@@QEAAAEAV01@_J@Z
     ??YDuration@absl@@QEAAAEAV01@V01@@Z
-    ??Z?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
-    ??Z?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??ZDuration@absl@@QEAAAEAV01@V01@@Z
     ??_0Duration@absl@@QEAAAEAV01@N@Z
     ??_0Duration@absl@@QEAAAEAV01@_J@Z
diff --git a/symbols_x64_rel_asan.def b/symbols_x64_rel_asan.def
index 91361d6..f9e7440 100644
--- a/symbols_x64_rel_asan.def
+++ b/symbols_x64_rel_asan.def
@@ -163,6 +163,9 @@
     ??BCord@absl@@QEBA?AV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@XZ
     ??Bint128@absl@@QEBANXZ
     ??EChunkIterator@Cord@absl@@QEAAAEAV012@XZ
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
+    ??Hdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
     ??Kabsl@@YA?AVint128@0@V10@0@Z
     ??Kabsl@@YA?AVuint128@0@V10@0@Z
     ??Labsl@@YA?AVint128@0@V10@0@Z
@@ -171,8 +174,6 @@
     ??XDuration@absl@@QEAAAEAV01@N@Z
     ??XDuration@absl@@QEAAAEAV01@_J@Z
     ??YDuration@absl@@QEAAAEAV01@V01@@Z
-    ??Z?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
-    ??Z?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QEAAAEAV01234@_J@Z
     ??ZDuration@absl@@QEAAAEAV01@V01@@Z
     ??_0Duration@absl@@QEAAAEAV01@N@Z
     ??_0Duration@absl@@QEAAAEAV01@_J@Z
diff --git a/symbols_x86_dbg.def b/symbols_x86_dbg.def
index c41d90c..204aa4a 100644
--- a/symbols_x86_dbg.def
+++ b/symbols_x86_dbg.def
@@ -1338,13 +1338,10 @@
     ??XDuration@absl@@QAEAAV01@_J@Z
     ??Xint128@absl@@QAEAAV01@V01@@Z
     ??Xuint128@absl@@QAEAAV01@V01@@Z
-    ??Y?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QAEAAV01234@_J@Z
-    ??Y?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QAEAAV01234@_J@Z
     ??YDuration@absl@@QAEAAV01@V01@@Z
     ??YTime@absl@@QAEAAV01@VDuration@1@@Z
     ??Yint128@absl@@QAEAAV01@V01@@Z
     ??Yuint128@absl@@QAEAAV01@V01@@Z
-    ??Z?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QAEAAV01234@_J@Z
     ??Z?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QAEAAV01234@_J@Z
     ??ZDuration@absl@@QAEAAV01@V01@@Z
     ??Zint128@absl@@QAEAAV01@V01@@Z
diff --git a/symbols_x86_rel.def b/symbols_x86_rel.def
index 1d00a74..c9a6488 100644
--- a/symbols_x86_rel.def
+++ b/symbols_x86_rel.def
@@ -153,8 +153,8 @@
     ??BCord@absl@@QBE?AV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@XZ
     ??Bint128@absl@@QBENXZ
     ??EChunkIterator@Cord@absl@@QAEAAV012@XZ
-    ??Hdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
-    ??Hdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
+    ??Gdetail@cctz@time_internal@absl@@YA?AV?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@0123@V40123@_J@Z
     ??Kabsl@@YA?AVint128@0@V10@0@Z
     ??Kabsl@@YA?AVuint128@0@V10@0@Z
     ??Labsl@@YA?AVint128@0@V10@0@Z
@@ -163,8 +163,6 @@
     ??XDuration@absl@@QAEAAV01@N@Z
     ??XDuration@absl@@QAEAAV01@_J@Z
     ??YDuration@absl@@QAEAAV01@V01@@Z
-    ??Z?$civil_time@Uday_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QAEAAV01234@_J@Z
-    ??Z?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@detail@cctz@time_internal@absl@@QAEAAV01234@_J@Z
     ??ZDuration@absl@@QAEAAV01@V01@@Z
     ??_0Duration@absl@@QAEAAV01@N@Z
     ??_0Duration@absl@@QAEAAV01@_J@Z