diff --git a/CMakeLists.txt b/CMakeLists.txt
index c1bbe08a9b..4d3bb9810b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,9 @@ cmake_minimum_required(VERSION 3.22)
 
 set (CMAKE_CXX_STANDARD 14)
 set (CMAKE_CXX_STANDARD_REQUIRED YES)  # Don't fall back to an earlier version.
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  add_compile_definitions(_GNU_SOURCE)
+endif()
 
 # Turn on virtual folders for visual studio
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
@@ -96,8 +99,14 @@ set(FIREBASE_XCODE_TARGET_FORMAT "frameworks" CACHE STRING
 set(FIREBASE_CPP_SDK_ROOT_DIR ${CMAKE_CURRENT_LIST_DIR})
 
 project (firebase NONE)
+
+set(CMAKE_Swift_LANGUAGE_VERSION 5.9)
+
 enable_language(C)
 enable_language(CXX)
+if(CMAKE_SYSTEM_NAME STREQUAL "iOS" OR CMAKE_SYSTEM_NAME STREQUAL "tvOS")
+  enable_language(Swift)
+endif()
 
 if(NOT DEFINED CMAKE_CXX_COMPILER_LAUNCHER)
   find_program(CCACHE_PROGRAM ccache)
@@ -152,6 +161,7 @@ if(DESKTOP AND APPLE)
 endif()
 
 if(APPLE)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_LIBCPP_DISABLE_AVAILABILITY -D_LIBCPP_HAS_NO_VERBOSE_ABORT")
   # For iOS and macOS, disable nullability completeness warning, as it makes the
   # build output for our Objective-C++ files much too verbose.
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-nullability-completeness")
@@ -356,6 +366,7 @@ endif()
 # Include Firestore's external build early to resolve conflicts on packages.
 if(FIRESTORE_USE_EXTERNAL_CMAKE_BUILD)
   if(APPLE)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_LIBCPP_DISABLE_AVAILABILITY -D_LIBCPP_HAS_NO_VERBOSE_ABORT")
     # On Apple, set GRPC_BAZEL_BUILD to fix an issue with __thread.
     # Setting this define makes gRPC use pthread's thread-local storage
     # instead of GCC's.
@@ -477,6 +488,7 @@ if(DESKTOP)
         -DUSE_LIBUV=1
       )
     elseif(APPLE)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_LIBCPP_DISABLE_AVAILABILITY -D_LIBCPP_HAS_NO_VERBOSE_ABORT")
       set(websockets_additional_defines
         ${websockets_additional_defines}
         -DUSE_LIBUV=1
diff --git a/analytics/CMakeLists.txt b/analytics/CMakeLists.txt
index 63d33b125f..0065008dd7 100644
--- a/analytics/CMakeLists.txt
+++ b/analytics/CMakeLists.txt
@@ -72,7 +72,8 @@ set(android_SRCS
 
 # Source files used by the iOS implementation.
 set(ios_SRCS
-    src/analytics_ios.mm)
+    src/analytics_ios.mm
+    src/ios/swift/AppleTransactionVerifier.swift)
 
 # Source files used by the desktop / stub implementation.
 set(desktop_SRCS
@@ -88,8 +89,12 @@ if(ANDROID)
   set(analytics_platform_SRCS
       "${android_SRCS}")
 elseif(IOS)
+  if(CMAKE_GENERATOR STREQUAL "Unix Makefiles")
+    message(FATAL_ERROR "Swift is not supported by the 'Unix Makefiles' generator on iOS. Please use the Xcode generator (-G Xcode) or Ninja (-G Ninja).")
+  endif()
   set(analytics_platform_SRCS
       "${ios_SRCS}")
+  
 else()
   set(analytics_platform_SRCS
       "${desktop_SRCS}")
@@ -99,6 +104,9 @@ add_library(firebase_analytics STATIC
     ${common_SRCS}
     ${analytics_platform_SRCS})
 
+
+add_dependencies(firebase_analytics FIREBASE_ANALYTICS_GENERATED_HEADERS)
+
 set_property(TARGET firebase_analytics PROPERTY FOLDER "Firebase Cpp")
 
 # Set up the dependency on Firebase App.
@@ -122,20 +130,86 @@ target_compile_definitions(firebase_analytics
     -DINTERNAL_EXPERIMENTAL=1
 )
 # Automatically include headers that might not be declared.
-if(MSVC)
-  add_definitions(/FI"assert.h" /FI"string.h" /FI"stdint.h")
+if(IOS)
+  if(MSVC)
+    target_compile_options(firebase_analytics PRIVATE
+      $<$<NOT:$<COMPILE_LANGUAGE:Swift>>:/FI"assert.h">
+      $<$<NOT:$<COMPILE_LANGUAGE:Swift>>:/FI"string.h">
+      $<$<NOT:$<COMPILE_LANGUAGE:Swift>>:/FI"stdint.h">)
+  else()
+    target_compile_options(firebase_analytics PRIVATE
+      $<$<NOT:$<COMPILE_LANGUAGE:Swift>>:SHELL:-include assert.h -include string.h>
+    )
+  endif()
 else()
-  add_definitions(-include assert.h -include string.h)
+  if(MSVC)
+    target_compile_options(firebase_analytics PRIVATE
+      /FI"assert.h" /FI"string.h" /FI"stdint.h")
+  else()
+    target_compile_options(firebase_analytics PRIVATE
+      SHELL:-include assert.h -include string.h
+    )
+  endif()
 endif()
 
 if(ANDROID)
   firebase_cpp_proguard_file(analytics)
 elseif(IOS)
-  # Enable Automatic Reference Counting (ARC) and Bitcode.
+  # Enable Automatic Reference Counting (ARC) and Bitcode specifically for Objective-C++ files.
+  # Note: -fembed-bitcode is placed here for src/analytics_ios.mm so that it is not passed
+  # to the Swift compiler, which does not support the flag.
+  set_source_files_properties(src/analytics_ios.mm PROPERTIES COMPILE_OPTIONS "-fobjc-arc;-fembed-bitcode")
+
+  if(CMAKE_GENERATOR STREQUAL "Xcode")
+    target_include_directories(firebase_analytics PRIVATE "$(DERIVED_FILE_DIR)")
+    target_compile_options(firebase_analytics PRIVATE 
+      "-I$(OBJECT_FILE_DIR_normal)/$(CURRENT_ARCH)"
+    )
+  else()
+    target_include_directories(firebase_analytics PRIVATE "${CMAKE_CURRENT_BINARY_DIR}")
+  endif()
+ 
+  # Swift needs to find the FirebaseAnalytics module from CocoaPods
+  set(pods_dir "${FIREBASE_POD_DIR}/Pods")
+  
+  # Point to the base directories containing the .xcframework folders.
+  # Xcode natively handles XCFrameworks and will pick the right slice automatically.
+  # Determine the xcframework architecture slice based on the target platform
+  # and if it is running on simulator or device.
+  string(TOLOWER "${CMAKE_OSX_SYSROOT}" sysroot_lower)
+  if(CMAKE_SYSTEM_NAME STREQUAL "tvOS")
+    if(sysroot_lower MATCHES "simulator")
+      set(analytics_slice "tvos-arm64_x86_64-simulator")
+    else()
+      set(analytics_slice "tvos-arm64")
+    endif()
+  else()
+    if(sysroot_lower MATCHES "simulator")
+      set(analytics_slice "ios-arm64_x86_64-simulator")
+    else()
+      set(analytics_slice "ios-arm64")
+    endif()
+  endif()
+
+  set(analytics_framework_dir "${pods_dir}/FirebaseAnalytics/Frameworks/FirebaseAnalytics.xcframework/${analytics_slice}")
+  set(measurement_framework_dir "${pods_dir}/GoogleAppMeasurement/Frameworks/GoogleAppMeasurement.xcframework/${analytics_slice}")
+  
   target_compile_options(firebase_analytics
-                         PUBLIC "-fobjc-arc" "-fembed-bitcode")
-  target_link_libraries(firebase_analytics
-                        PUBLIC "-fembed-bitcode")
+    PRIVATE
+      $<$<COMPILE_LANGUAGE:Swift>:-F${analytics_framework_dir}>
+      $<$<COMPILE_LANGUAGE:Swift>:-F${measurement_framework_dir}>
+  )
+  
+  target_link_options(firebase_analytics
+    PUBLIC
+      "-F${analytics_framework_dir}"
+      "-F${measurement_framework_dir}"
+  )
+
+  # Prevent Xcode from trying to build or evaluate headers for unused architectures
+  set_target_properties(firebase_analytics PROPERTIES
+    XCODE_ATTRIBUTE_ONLY_ACTIVE_ARCH "YES"
+  )
 
   setup_pod_headers(
     firebase_analytics
diff --git a/analytics/integration_test/integration_test.xcodeproj/project.pbxproj b/analytics/integration_test/integration_test.xcodeproj/project.pbxproj
index b7b48a1f42..d43e30ff77 100644
--- a/analytics/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/analytics/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -375,6 +375,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -418,6 +420,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -455,6 +459,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -487,6 +493,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -518,6 +526,8 @@
 		BC1D665F2668D10A005DC2DA /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -572,6 +582,8 @@
 		BC1D66602668D10A005DC2DA /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/analytics/integration_test/readme.md b/analytics/integration_test/readme.md
index 18599e5952..7aac97e26a 100644
--- a/analytics/integration_test/readme.md
+++ b/analytics/integration_test/readme.md
@@ -64,6 +64,37 @@ Building and Running the sample
     "Analytics" tab accessible from
     [https://firebase.google.com/console/](https://firebase.google.com/console/).
 
+#### iOS Testing LogAppleTransaction
+
+To test the log apple transaction function, you should use the existing test app and xcode's simulated transactions.
+The manual test will involve running the integration test: `firebase_analytics_test/TestLogAppleTransaction` and verifying that it logs a transaction to the console.
+
+  - Step 1: Set up the Local Xcode Environment
+    - In Xcode, go to File > New > File from Template and create a StoreKit Configuration File (.storekit).
+      - Give the configuration any name.
+      - Target both integration_test and integration_test_tvos
+    - Add at least one dummy product to this file. 
+      - Do this by selecting the file in xcode and clicking the + button in the bottom left corner.
+      - Choose a Non-Consumable in app purchase product. 
+      - Give it a Reference name of your choice (e.g. "ReferenceAppleIapProduct").
+      - Give it a Product ID of your choice (e.g. "com.example.nonconsumable").
+    - Make the app use the store kit file. In the top bar go to Product > Scheme > Edit Scheme... >
+      - In the left hand menu select Run
+      - Select the Options tab on the right
+      - Set the StoreKit Configuration dropdown to your new .storekit file.
+  - Step 2: Validate logging transactions
+    - Try running the test app with the dummy transaction ID. It should return an error from the
+      LogAppleTransactions function.
+    - After runnign the app once you can create a simulated transaction for testing.
+    - To create a simulated transaction ID:
+        - Go to Debug > StoreKit > Manage Transactions.
+        - Click the + button in the bottom left corner.
+        - Select the Non-Consumable in app purchase product.
+        - Copy the transaction ID to the test case and replace 'dummy_transaction_id' with your new transaction ID. e.g. '0'
+        - Make sure to update the testcase to now expect success. 
+    - Then try running the test app again with the simulated transaction ID.
+      - It should log the transaction to the console. Both the Xcode console and firebase console should show a log for an in app purchase. 
+
 ### Android
   - Register your Android app with Firebase.
     - Create a new app on the [Firebase console](https://firebase.google.com/console/), and attach
diff --git a/analytics/integration_test/src/integration_test.cc b/analytics/integration_test/src/integration_test.cc
index 54016135d9..462b9b5912 100644
--- a/analytics/integration_test/src/integration_test.cc
+++ b/analytics/integration_test/src/integration_test.cc
@@ -22,6 +22,10 @@
 #include <ctime>
 #include <future>
 
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+
 #include "app_framework.h"  // NOLINT
 #include "firebase/analytics.h"
 #include "firebase/analytics/event_names.h"
@@ -299,6 +303,21 @@ TEST_F(FirebaseAnalyticsTest, TestDesktopDebugMode) {
   firebase::analytics::SetDesktopDebugMode(false);
 }
 
+TEST_F(FirebaseAnalyticsTest, TestLogAppleTransaction) {
+  auto future =
+      firebase::analytics::LogAppleTransaction("dummy_transaction_id");
+  WaitForCompletionAnyResult(future, "LogAppleTransaction");
+#if defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)
+  // On iOS/tvOS, passing a dummy transaction ID will fail to find a verified
+  // transaction.
+  EXPECT_NE(future.error(), 0);
+#else
+  // On Android and Desktop (including macOS), LogAppleTransaction is a no-op
+  // that returns success.
+  EXPECT_EQ(future.error(), 0);
+#endif
+}
+
 TEST_F(FirebaseAnalyticsTest, TestLogEvents) {
   // Log an event with no parameters.
   firebase::analytics::LogEvent(firebase::analytics::kEventLogin);
diff --git a/analytics/src/analytics_android.cc b/analytics/src/analytics_android.cc
index fe1ba4235a..9d097a847c 100644
--- a/analytics/src/analytics_android.cc
+++ b/analytics/src/analytics_android.cc
@@ -502,6 +502,30 @@ void LogEvent(const char* name) {
   LogEvent(name, nullptr, static_cast<size_t>(0));
 }
 
+/// Log an Apple StoreKit 2 transaction. This is a no-op on Android and returns
+/// success.
+Future<void> LogAppleTransaction(const char* transaction_id) {
+  auto* api = internal::FutureData::Get() ? internal::FutureData::Get()->api()
+                                          : nullptr;
+  if (!api) {
+    return Future<void>();
+  }
+  const auto future_handle =
+      api->SafeAlloc<void>(internal::kAnalyticsFnLogAppleTransaction);
+  api->Complete(future_handle, 0, "");
+  return Future<void>(api, future_handle.get());
+}
+
+Future<void> LogAppleTransactionLastResult() {
+  auto* api = internal::FutureData::Get() ? internal::FutureData::Get()->api()
+                                          : nullptr;
+  if (!api) {
+    return Future<void>();
+  }
+  return static_cast<const Future<void>&>(
+      api->LastResult(internal::kAnalyticsFnLogAppleTransaction));
+}
+
 // Log an event with associated parameters.
 void LogEvent(const char* name, const Parameter* parameters,
               size_t number_of_parameters) {
diff --git a/analytics/src/analytics_common.h b/analytics/src/analytics_common.h
index 90de297d7a..edad4ce07f 100644
--- a/analytics/src/analytics_common.h
+++ b/analytics/src/analytics_common.h
@@ -24,9 +24,10 @@ namespace analytics {
 namespace internal {
 
 enum AnalyticsFn {
-  kAnalyticsFnGetAnalyticsInstanceId,
+  kAnalyticsFnGetAnalyticsInstanceId = 0,
   kAnalyticsFnGetSessionId,
-  kAnalyticsFnCount
+  kAnalyticsFnLogAppleTransaction,
+  kAnalyticsFnCount,
 };
 
 // Data structure which holds the Future API for this module.
diff --git a/analytics/src/analytics_desktop.cc b/analytics/src/analytics_desktop.cc
index 880c3936a9..c3181621e9 100644
--- a/analytics/src/analytics_desktop.cc
+++ b/analytics/src/analytics_desktop.cc
@@ -467,6 +467,30 @@ void LogEvent(const char* name) {
   LogEvent(name, static_cast<const Parameter*>(nullptr), 0);
 }
 
+/// Log an Apple StoreKit 2 transaction. This is a no-op on Desktop and returns
+/// success.
+Future<void> LogAppleTransaction(const char* transaction_id) {
+  auto* api = internal::FutureData::Get() ? internal::FutureData::Get()->api()
+                                          : nullptr;
+  if (!api) {
+    return Future<void>();
+  }
+  const auto future_handle =
+      api->SafeAlloc<void>(internal::kAnalyticsFnLogAppleTransaction);
+  api->Complete(future_handle, 0, "");
+  return Future<void>(api, future_handle.get());
+}
+
+Future<void> LogAppleTransactionLastResult() {
+  auto* api = internal::FutureData::Get() ? internal::FutureData::Get()->api()
+                                          : nullptr;
+  if (!api) {
+    return Future<void>();
+  }
+  return static_cast<const Future<void>&>(
+      api->LastResult(internal::kAnalyticsFnLogAppleTransaction));
+}
+
 void LogEvent(const char* name, const char* parameter_name,
               const char* parameter_value) {
   if (parameter_name == nullptr) {
diff --git a/analytics/src/analytics_ios.mm b/analytics/src/analytics_ios.mm
index 38aa5275e7..f33297eeab 100644
--- a/analytics/src/analytics_ios.mm
+++ b/analytics/src/analytics_ios.mm
@@ -20,9 +20,12 @@
 #import "FIRAnalytics+OnDevice.h"
 #import "FIRAnalytics.h"
 
+#include "analytics/src/analytics_common.h"
 #include "analytics/src/include/firebase/analytics.h"
 
-#include "analytics/src/analytics_common.h"
+// Include the generated Swift header for the C++ bridge.
+#include "firebase_analytics-Swift.h"
+
 #include "app/src/assert.h"
 #include "app/src/include/firebase/internal/mutex.h"
 #include "app/src/include/firebase/version.h"
@@ -231,6 +234,60 @@ void LogEvent(const char* name) {
   [FIRAnalytics logEventWithName:@(name) parameters:@{}];
 }
 
+extern "C" {
+void CompleteLogAppleTransaction(const void* context, bool success) {
+  FIREBASE_ASSERT_RETURN_VOID(context != nullptr);
+  auto* handle_ptr = static_cast<SafeFutureHandle<void>*>(const_cast<void*>(context));
+
+  MutexLock lock(g_mutex);
+  if (!internal::IsInitialized()) {
+    delete handle_ptr;
+    return;
+  }
+
+  auto* api = internal::FutureData::Get()->api();
+  if (success) {
+    api->Complete(*handle_ptr, 0, "");
+  } else {
+    api->Complete(*handle_ptr, -1, "StoreKit 2 transaction not found.");
+  }
+  delete handle_ptr;
+}
+}
+
+Future<void> LogAppleTransaction(const char* transaction_id) {
+  MutexLock lock(g_mutex);
+  FIREBASE_ASSERT_RETURN(Future<void>(), internal::IsInitialized());
+
+  auto* api = internal::FutureData::Get()->api();
+  const auto future_handle = api->SafeAlloc<void>(internal::kAnalyticsFnLogAppleTransaction);
+
+  if (!transaction_id) {
+    api->Complete(future_handle, -1, "Transaction ID is null");
+    return Future<void>(api, future_handle.get());
+  }
+
+  SafeFutureHandle<void>* handle_ptr = new SafeFutureHandle<void>(future_handle);
+
+  // 2. Call Swift using a standard Objective-C block.
+  // We capture the C++ handle_ptr inside the Objective-C block. Swift never sees it.
+  [AppleTransactionVerifier verifyWithTransactionId:SafeString(transaction_id) 
+                                       completion:^(BOOL isFound) {
+      // 3. We are back in C++ land on the Main Thread. 
+      // Call your completion logic directly.
+      CompleteLogAppleTransaction(handle_ptr, isFound == YES);
+  }];
+
+  return Future<void>(api, future_handle.get());
+}
+
+Future<void> LogAppleTransactionLastResult() {
+  MutexLock lock(g_mutex);
+  FIREBASE_ASSERT_RETURN(Future<void>(), internal::IsInitialized());
+  return static_cast<const Future<void>&>(
+      internal::FutureData::Get()->api()->LastResult(internal::kAnalyticsFnLogAppleTransaction));
+}
+
 // Declared here so that it can be used, defined below.
 NSDictionary* MapToDictionary(const std::map<Variant, Variant>& map);
 
diff --git a/analytics/src/include/firebase/analytics.h b/analytics/src/include/firebase/analytics.h
index 47a5aab72b..fcdb723403 100644
--- a/analytics/src/include/firebase/analytics.h
+++ b/analytics/src/include/firebase/analytics.h
@@ -455,6 +455,37 @@ void LogEvent(const char* name, const char* parameter_name,
 /// @endif
 void LogEvent(const char* name);
 
+/// @brief Logs an in-app purchase transaction specifically for Apple's
+/// StoreKit 2.
+///
+/// This function is intended for developers on iOS who process transactions
+/// via custom native plugins or engines and need to securely log those
+/// transactions natively through Google Analytics. The provided ID must map 1:1
+/// with the native Apple `Transaction.id`. If a matching transaction is not
+/// found in the Apple device's purchase history, nothing will be logged to
+/// Analytics.
+///
+/// @note Finished consumable transactions are removed from the local
+///       transaction history and cannot be retrieved by this function once
+///       finished. Developers should either call this function before finishing
+///       the transaction or use `FirebaseAnalytics.LogEvent` directly as a
+///       fallback.
+///
+/// @param transaction_id The native Apple transaction identifier as a
+///                       null-terminated string.
+///
+/// @returns A Future<void> that completes successfully when the native
+///          StoreKit 2 transaction is found and logged. If the transaction
+///          cannot be found, the Future will complete with a non-zero error().
+Future<void> LogAppleTransaction(const char* transaction_id);
+
+/// @brief Get the result of the most recent LogAppleTransaction() call.
+///
+/// @returns A Future<void> that completes successfully when the native
+///          StoreKit 2 transaction is found and logged. If the transaction
+///          cannot be found, the Future will complete with a non-zero error().
+Future<void> LogAppleTransactionLastResult();
+
 /// @brief Log an event with associated parameters.
 ///
 /// An Event is an important occurrence in your app that you want to
diff --git a/analytics/src/ios/swift/AppleTransactionVerifier.swift b/analytics/src/ios/swift/AppleTransactionVerifier.swift
new file mode 100644
index 0000000000..29bbe40e03
--- /dev/null
+++ b/analytics/src/ios/swift/AppleTransactionVerifier.swift
@@ -0,0 +1,72 @@
+// Copyright 2026 Google
+//
+// 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
+//
+//      http://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.
+
+import Foundation
+import StoreKit
+import FirebaseAnalytics
+
+// Pure Swift worker to prevent compiler generation bugs with witness tables 
+// when mixing @objc and Swift Concurrency on older iOS deployment targets.
+@available(iOS 15.0, tvOS 15.0, macOS 12.0, watchOS 8.0, *)
+internal struct AppleTransactionWorker {
+    static func findAndLogTransaction(id: String) async -> Bool {
+        // Using a standard while loop instead of `for await` avoids a known 
+        // Xcode 15+ compiler bug where corrupted witness tables are generated 
+        // for AsyncSequences when targeting iOS 15/16.
+        var iterator = Transaction.all.makeAsyncIterator()
+        while let verificationResult = await iterator.next() {
+            if case .verified(let transaction) = verificationResult {
+                if String(transaction.id) == id {
+                    Analytics.logTransaction(transaction)
+                    return true
+                }
+            }
+        }
+        return false
+    }
+}
+
+@objc public class AppleTransactionVerifier: NSObject {
+    
+    // Notice: To avoid C-pointer ABI layout issues across Swift boundaries, 
+    // this interface relies purely on a standard Swift closure. The calling 
+    // C++ layer captures any necessary pointers within an Objective-C block.
+    @objc public static func verify(transactionId: String, completion: @escaping (Bool) -> Void) {
+        if #available(iOS 15.0, tvOS 15.0, macOS 12.0, watchOS 8.0, *) {
+            // Create a pure Swift String copy of the transaction ID.
+            // This ensures we do not rely on the memory of the bridged Objective-C
+            // NSString, which might be destroyed by the calling C++ thread before
+            // the asynchronous Task completes.
+            let safeId = String(transactionId)
+            
+            // Use a detached task to avoid inheriting any C++/ObjC thread context.
+            // This prevents EXC_BAD_ACCESS during `swift_task_alloc` on iOS 15/16.
+            Task.detached(priority: .userInitiated) { [safeId, completion] in
+                let isFound = await AppleTransactionWorker.findAndLogTransaction(id: safeId)
+                
+                // Return to the main thread to ensure thread safety when the C++ 
+                // layer receives the callback and manages internal state.
+                DispatchQueue.main.async {
+                    completion(isFound)
+                }
+            }
+        } else {
+            // Not on a supported OS, resolve immediately on the main thread 
+            // to avoid potential deadlocks if called while holding a C++ mutex.
+            DispatchQueue.main.async {
+                completion(false)
+            }
+        }
+    }
+}
diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index c92f9124f8..852f30d9a9 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -320,6 +320,9 @@ add_library(firebase_app STATIC
     ${FIREBASE_GEN_FILE_DIR}/app/google_services_generated.h
     ${app_flatbuffers_srcs})
 
+add_dependencies(firebase_app FIREBASE_APP_GENERATED_HEADERS)
+add_dependencies(firebase_app app_generated_google_services_includes)
+
 set_property(TARGET firebase_app PROPERTY FOLDER "Firebase Cpp")
 
 # Disable exceptions in std
@@ -364,22 +367,28 @@ target_link_libraries(firebase_app
     ${app_flatbuffers_lib}
     ${LIBSECRET_LIBRARIES}
 )
-# Automatically include headers that might not be declared.
 if(MSVC)
-  add_definitions(/FI"assert.h" /FI"string.h" /FI"stdint.h")
+  target_compile_options(firebase_app PRIVATE
+    $<$<COMPILE_LANGUAGE:CXX>:/FI"assert.h" /FI"string.h" /FI"stdint.h">)
+elseif(APPLE)
+  target_compile_options(firebase_app PRIVATE
+    "$<$<COMPILE_LANGUAGE:CXX>:SHELL:-include assert.h>"
+    "$<$<COMPILE_LANGUAGE:CXX>:SHELL:-include string.h>"
+    "$<$<COMPILE_LANGUAGE:OBJCXX>:SHELL:-include assert.h>"
+    "$<$<COMPILE_LANGUAGE:OBJCXX>:SHELL:-include string.h>")
 else()
-  add_definitions(-include assert.h -include string.h)
+  target_compile_options(firebase_app PRIVATE
+    "$<$<COMPILE_LANGUAGE:CXX>:SHELL:-include assert.h>"
+    "$<$<COMPILE_LANGUAGE:CXX>:SHELL:-include string.h>")
 endif()
 
 if(ANDROID)
   firebase_cpp_proguard_file(app)
 elseif(IOS)
   # Enable Automatic Reference Counting (ARC) and Bitcode.
+  # Enable Automatic Reference Counting (ARC) for Objective-C/Swift interop
   target_compile_options(firebase_app
-                         PUBLIC "-fobjc-arc" "-fembed-bitcode")
-  target_link_libraries(firebase_app
-                        PUBLIC "-fembed-bitcode")
-
+                         PUBLIC $<$<NOT:$<COMPILE_LANGUAGE:Swift>>:-fobjc-arc>)
   # Add empty include path to get root include folder '.'
   setup_pod_headers(
     firebase_app
@@ -417,38 +426,16 @@ if (IOS)
     )
   endif()
 
-  # Generate the analytics header file
-  # Copy from analytics/CMakeList.txt
-  function(generate_analytics_header OBJC_FILE CPP_FILE)
-    add_custom_command(
-      OUTPUT ${CPP_FILE}
-      COMMAND ${FIREBASE_PYTHON_EXECUTABLE} "${FIREBASE_SOURCE_DIR}/analytics/generate_constants.py"
-        "--objc_header=${OBJC_FILE}"
-        "--cpp_header=${CPP_FILE}"
-      DEPENDS ${OBJC_FILE}
-      COMMENT "Generating ${CPP_FILE}"
-    )
-  endfunction()
-  set(analytics_generated_headers_dir
-    ${FIREBASE_GEN_FILE_DIR}/analytics/src/include/firebase/analytics)
-  file(MAKE_DIRECTORY ${FIREBASE_GEN_FILE_DIR}/analytics/src/include/firebase/analytics)
-  generate_analytics_header(
-    "${FIREBASE_SOURCE_DIR}/analytics/ios_headers/FIREventNames.h"
-    "${analytics_generated_headers_dir}/event_names.h"
-  )
-  generate_analytics_header(
-    "${FIREBASE_SOURCE_DIR}/analytics/ios_headers/FIRParameterNames.h"
-    "${analytics_generated_headers_dir}/parameter_names.h"
-  )
-  generate_analytics_header(
-    "${FIREBASE_SOURCE_DIR}/analytics/ios_headers/FIRUserPropertyNames.h"
-    "${analytics_generated_headers_dir}/user_property_names.h"
-  )
-  set(analytics_HDRS
-    ${FIREBASE_SOURCE_DIR}/analytics/src/include/firebase/analytics.h
-    ${analytics_generated_headers_dir}/event_names.h
-    ${analytics_generated_headers_dir}/parameter_names.h
-    ${analytics_generated_headers_dir}/user_property_names.h)
+  if (FIREBASE_XCODE_TARGET_FORMAT STREQUAL "frameworks")
+    if (FIREBASE_INCLUDE_ANALYTICS)
+      set(analytics_HDRS
+      ${FIREBASE_SOURCE_DIR}/analytics/src/include/firebase/analytics.h
+      ${FIREBASE_GEN_FILE_DIR}/analytics/src/include/firebase/analytics/event_names.h
+      ${FIREBASE_GEN_FILE_DIR}/analytics/src/include/firebase/analytics/parameter_names.h
+      ${FIREBASE_GEN_FILE_DIR}/analytics/src/include/firebase/analytics/user_property_names.h)
+    else()
+      set(analytics_HDRS "")
+    endif()
   set(app_check_HDRS
     ${FIREBASE_SOURCE_DIR}/app_check/src/include/firebase/app_check.h
     ${FIREBASE_SOURCE_DIR}/app_check/src/include/firebase/app_check/app_attest_provider.h
@@ -470,35 +457,39 @@ if (IOS)
     ${FIREBASE_SOURCE_DIR}/database/src/include/firebase/database/mutable_data.h
     ${FIREBASE_SOURCE_DIR}/database/src/include/firebase/database/query.h
     ${FIREBASE_SOURCE_DIR}/database/src/include/firebase/database/transaction.h)
-  set(firestore_HDRS
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/aggregate_query.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/aggregate_query_snapshot.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/aggregate_source.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/collection_reference.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/document_change.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/document_reference.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/document_snapshot.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/field_path.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/field_value.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/filter.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/listener_registration.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/load_bundle_task_progress.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/map_field_value.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/metadata_changes.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/query_snapshot.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/query.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/set_options.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/settings.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/snapshot_metadata.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/source.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/transaction.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/transaction_options.h
-    ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/write_batch.h
-    ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/firestore_errors.h
-    ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/firestore_version.h
-    ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/geo_point.h
-    ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/timestamp.h)
+  if (EXISTS "${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal")
+    set(firestore_HDRS
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/aggregate_query.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/aggregate_query_snapshot.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/aggregate_source.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/collection_reference.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/document_change.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/document_reference.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/document_snapshot.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/field_path.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/field_value.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/filter.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/listener_registration.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/load_bundle_task_progress.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/map_field_value.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/metadata_changes.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/query_snapshot.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/query.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/set_options.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/settings.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/snapshot_metadata.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/source.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/transaction.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/transaction_options.h
+      ${FIREBASE_SOURCE_DIR}/firestore/src/include/firebase/firestore/write_batch.h
+      ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/firestore_errors.h
+      ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/firestore_version.h
+      ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/geo_point.h
+      ${FIREBASE_POD_DIR}/Pods/FirebaseFirestoreInternal/Firestore/core/include/firebase/firestore/timestamp.h)
+  else()
+    set(firestore_HDRS "")
+  endif()
   set(functions_HDRS
     ${FIREBASE_SOURCE_DIR}/functions/src/include/firebase/functions.h
     ${FIREBASE_SOURCE_DIR}/functions/src/include/firebase/functions/callable_reference.h
@@ -563,4 +554,5 @@ if (IOS)
   # to destination dir "Headers/google_play_services/*"
   set_property(SOURCE "src/include/google_play_services/availability.h" PROPERTY 
                   MACOSX_PACKAGE_LOCATION Headers/google_play_services)
+  endif() # framework_HDRS
 endif()
diff --git a/app/integration_test/integration_test.xcodeproj/project.pbxproj b/app/integration_test/integration_test.xcodeproj/project.pbxproj
index ecd3d7ba3a..29c291307a 100644
--- a/app/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/app/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -210,6 +210,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -253,6 +255,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -290,6 +294,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -322,6 +328,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
diff --git a/app/src/secure/user_secure_fake_internal.cc b/app/src/secure/user_secure_fake_internal.cc
index 5271d16aff..1b524e2a60 100644
--- a/app/src/secure/user_secure_fake_internal.cc
+++ b/app/src/secure/user_secure_fake_internal.cc
@@ -29,6 +29,7 @@
 #include <errno.h>
 
 #include <cstdio>
+#include <cstring>
 #include <fstream>
 #include <string>
 
diff --git a/app_check/integration_test/integration_test.xcodeproj/project.pbxproj b/app_check/integration_test/integration_test.xcodeproj/project.pbxproj
index d461e3db5c..d15f733d5d 100644
--- a/app_check/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/app_check/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -322,6 +322,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -365,6 +367,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -402,6 +406,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -435,6 +441,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -467,6 +475,8 @@
 		9F2ABA39267A4721001A35CE /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -521,6 +531,8 @@
 		9F2ABA3A267A4721001A35CE /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/auth/integration_test/integration_test.xcodeproj/project.pbxproj b/auth/integration_test/integration_test.xcodeproj/project.pbxproj
index fee3b799bd..0f0f63d080 100644
--- a/auth/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/auth/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -400,6 +400,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -443,6 +445,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -480,6 +484,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -513,6 +519,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -545,6 +553,8 @@
 		9F3A08FE266978C400E1D69F /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -599,6 +609,8 @@
 		9F3A08FF266978C400E1D69F /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/build_scripts/ios/build.sh b/build_scripts/ios/build.sh
index 73af95608f..b4c3521aa3 100755
--- a/build_scripts/ios/build.sh
+++ b/build_scripts/ios/build.sh
@@ -1,5 +1,7 @@
 #!/bin/bash -e
 
+export LANG=en_US.UTF-8
+
 # Copyright 2020 Google LLC
 #
 # Script to build iOS XCFrameworks
@@ -123,7 +125,7 @@ if ${generateMakefiles}; then
         for arch in ${architectures[@]}; do 
             sysroot_arg=""
             if [[ "${platform}" == "device" && " ${DEVICE_ARCHITECTURES[@]} " =~ " ${arch} " ]]; then
-                sysroot_arg="" # Default iphoneos sysroot is correct for iOS devices
+                sysroot_arg="-DCMAKE_OSX_SYSROOT=iphoneos"
             elif [[ "${platform}" == "simulator" && " ${SIMULATOR_ARCHITECTURES[@]} " =~ " ${arch} " ]]; then
                 sysroot_arg="-DCMAKE_OSX_SYSROOT=iphonesimulator" # Must specify sysroot for simulator, especially for x86_64
             else
@@ -132,10 +134,12 @@ if ${generateMakefiles}; then
 
             echo "generate Makefiles start"
             mkdir -p ${buildpath}/ios_build_file/${platform}-${arch} && cd ${buildpath}/ios_build_file/${platform}-${arch}
-            cmake -DCMAKE_SYSTEM_NAME=iOS \
+            cmake -G Xcode -DCMAKE_SYSTEM_NAME=iOS \
                 ${sysroot_arg} \
                 -DCMAKE_OSX_ARCHITECTURES=${arch} \
                 -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY=${buildpath}/${frameworkspath}/${platform}-${arch} \
+                -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG=${buildpath}/${frameworkspath}/${platform}-${arch} \
+                -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE=${buildpath}/${frameworkspath}/${platform}-${arch} \
                 ${sourcepath}
             echo "generate Makefiles end"
         done
diff --git a/database/integration_test/integration_test.xcodeproj/project.pbxproj b/database/integration_test/integration_test.xcodeproj/project.pbxproj
index cd97e10c8d..f989cfeb2d 100644
--- a/database/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/database/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -322,6 +322,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -365,6 +367,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -402,6 +406,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -435,6 +441,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -467,6 +475,8 @@
 		9F2ABA39267A4721001A35CE /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -521,6 +531,8 @@
 		9F2ABA3A267A4721001A35CE /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/firestore/integration_test/integration_test.xcodeproj/project.pbxproj b/firestore/integration_test/integration_test.xcodeproj/project.pbxproj
index d012e8557a..2c8adc2e56 100644
--- a/firestore/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/firestore/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -418,6 +418,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -461,6 +463,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -498,6 +502,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -531,6 +537,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -563,6 +571,8 @@
 		BC1D678C26799F8D005DC2DA /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -620,6 +630,8 @@
 		BC1D678D26799F8D005DC2DA /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/firestore/integration_test_internal/integration_test.xcodeproj/project.pbxproj b/firestore/integration_test_internal/integration_test.xcodeproj/project.pbxproj
index 67c4326e90..e8b0aa9951 100644
--- a/firestore/integration_test_internal/integration_test.xcodeproj/project.pbxproj
+++ b/firestore/integration_test_internal/integration_test.xcodeproj/project.pbxproj
@@ -703,6 +703,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -746,6 +748,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -784,6 +788,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = AA66DDF2F9BB2D8480FAB9BD /* Pods-integration_test.debug.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -834,6 +840,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 5FB592CD6A6DDFBF795F22C1 /* Pods-integration_test.release.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -883,6 +891,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = F64F2CE3EB5EF07EA247CB71 /* Pods-integration_test_tvos.debug.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -956,6 +966,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 3DE393E827F88B06CD3C39CD /* Pods-integration_test_tvos.release.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/functions/integration_test/integration_test.xcodeproj/project.pbxproj b/functions/integration_test/integration_test.xcodeproj/project.pbxproj
index aea4f280ed..0341f57a98 100644
--- a/functions/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/functions/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -401,6 +401,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -444,6 +446,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -482,6 +486,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 8675F0B26689AA876629E125 /* Pods-integration_test.debug.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -516,6 +522,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E30FEEB78B34075EC944F51F /* Pods-integration_test.release.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -549,6 +557,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = DC1961DDB894F0DB5BE0D891 /* Pods-integration_test_tvos.debug.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -607,6 +617,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 22934B574D2479C75CC4D751 /* Pods-integration_test_tvos.release.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/installations/integration_test/integration_test.xcodeproj/project.pbxproj b/installations/integration_test/integration_test.xcodeproj/project.pbxproj
index 5eda7ec6c9..ab2ffbefcf 100644
--- a/installations/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/installations/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -210,6 +210,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -253,6 +255,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -290,6 +294,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -322,6 +328,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
diff --git a/messaging/integration_test/integration_test.xcodeproj/project.pbxproj b/messaging/integration_test/integration_test.xcodeproj/project.pbxproj
index 801d0a002c..0feae07166 100644
--- a/messaging/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/messaging/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -399,6 +399,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -442,6 +444,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -480,6 +484,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 187DA1CE07295DEC4378B7E2 /* Pods-integration_test.debug.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -513,6 +519,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 577B09235E486561D55F37DF /* Pods-integration_test.release.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -545,6 +553,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = CCCD7F9F30C5B4CDF23E3893 /* Pods-integration_test_tvos.debug.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -600,6 +610,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 81EF7FBB876B573921A52197 /* Pods-integration_test_tvos.release.xcconfig */;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/release_build_files/readme.md b/release_build_files/readme.md
index 6c963edd74..abdf6b8bfc 100644
--- a/release_build_files/readme.md
+++ b/release_build_files/readme.md
@@ -268,6 +268,14 @@ Note: Parts of the Firebase iOS SDK are written in Swift. If your application
 does not use any Swift code, you may need to add an empty .swift file to your
 Xcode project to ensure that the Swift runtime is included in your app.
 
+Additionally, to resolve known Xcode 15+ crashes when deploying to iOS 15 or 16,
+you must add `-Wl,-weak-lswift_Concurrency` to your `OTHER_LDFLAGS` (Other
+Linker Flags). If your application crashes with a 'Symbol not found' error for
+`__libcpp_verbose_abort`, you should also add
+`-D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY` to your
+`OTHER_CPLUSPLUSFLAGS` (Other C++ Flags), or provide a fallback implementation
+in your code (e.g., `extern "C" void __libcpp_verbose_abort(const char* f, ...) { abort(); }`).
+
 #### Libraries
 
 If you prefer to link against static libraries instead of xcframeworks (see the
@@ -327,6 +335,14 @@ Note: Parts of the Firebase iOS SDK are written in Swift. If your application
 does not use any Swift code, you may need to add an empty .swift file to your
 Xcode project to ensure that the Swift runtime is included in your app.
 
+Additionally, to resolve known Xcode 15+ crashes when deploying to iOS 15 or 16,
+you must add `-Wl,-weak-lswift_Concurrency` to your `OTHER_LDFLAGS` (Other
+Linker Flags). If your application crashes with a 'Symbol not found' error for
+`__libcpp_verbose_abort`, you should also add
+`-D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY` to your
+`OTHER_CPLUSPLUSFLAGS` (Other C++ Flags), or provide a fallback implementation
+in your code (e.g., `extern "C" void __libcpp_verbose_abort(const char* f, ...) { abort(); }`).
+
 ### Desktop Implementation Dependencies
 
 #### Linux libraries
@@ -617,6 +633,8 @@ code.
 - Changes 
     - Functions (general): Add in support for Limited Use Tokens.
     - Storage: Added `List` API for all platforms, which gets the list of items under a `StorageReference`
+    - Analytics: Add in `LogAppleTransaction` for logging Storekit 2 transactions on iOS.
+    - General (iOS): Added `-Wl,-weak-lswift_Concurrency` and `-D_LIBCPP_HAS_NO_VERBOSE_ABORT` flags to resolve Xcode 15+ launch crashes on iOS 15 and 16.
 
 ### 13.5.0
 -   Changes
diff --git a/remote_config/integration_test/integration_test.xcodeproj/project.pbxproj b/remote_config/integration_test/integration_test.xcodeproj/project.pbxproj
index 632c12c670..73c61f851b 100644
--- a/remote_config/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/remote_config/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -375,6 +375,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -418,6 +420,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -455,6 +459,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -487,6 +493,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -518,6 +526,8 @@
 		BC1D665F2668D10A005DC2DA /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -572,6 +582,8 @@
 		BC1D66602668D10A005DC2DA /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/scripts/gha/build_ios_tvos.py b/scripts/gha/build_ios_tvos.py
index 7fe86343e6..760d7e5f42 100644
--- a/scripts/gha/build_ios_tvos.py
+++ b/scripts/gha/build_ios_tvos.py
@@ -85,6 +85,26 @@ def arrange_frameworks(archive_output_path):
       archive_output_path (str): Output path containing frameworks.
         Subdirectories should be the various target frameworks.
   """
+  if not os.path.exists(archive_output_path):
+    logging.warning('Skipping arrange_frameworks for missing path: ' + archive_output_path)
+    return
+
+  # Pull output out of Debug subdirectory if using multi-configuration generator (Xcode)
+  for entry in os.listdir(archive_output_path):
+    if entry.startswith('Debug') and os.path.isdir(os.path.join(archive_output_path, entry)):
+      debug_path = os.path.join(archive_output_path, entry)
+      logging.info('Pulling output out of subdirectory ' + debug_path)
+      for sub_entry in os.listdir(debug_path):
+        src = os.path.join(debug_path, sub_entry)
+        dest = os.path.join(archive_output_path, sub_entry)
+        if os.path.exists(dest):
+          if os.path.isdir(dest):
+            shutil.rmtree(dest)
+          else:
+            os.remove(dest)
+        shutil.move(src, archive_output_path)
+      os.rmdir(debug_path)
+
   archive_output_dir_entries = os.listdir(archive_output_path)
   if not 'firebase.framework' in archive_output_dir_entries:
     # Rename firebase_app path to firebase path
@@ -176,6 +196,8 @@ def build_universal_framework(frameworks_path, targets):
     platform_variant_architecture_dirs = os.listdir(framework_os_path)
     platform_variant_arch_map = defaultdict(list)
     for variant_architecture in platform_variant_architecture_dirs:
+      if '-' not in variant_architecture:
+        continue
       logging.debug('Inspecting ' + variant_architecture)
       platform_variant, architecture = variant_architecture.split('-')
       platform_variant_arch_map[platform_variant].append(architecture)
@@ -199,9 +221,9 @@ def build_universal_framework(frameworks_path, targets):
       return
 
     # Pick any of the platform-arch directories as a reference candidate mainly
-    # for obtaining a list of contained targets.
-    reference_dir_path = os.path.join(framework_os_path,
-                                      platform_variant_architecture_dirs[0])
+    # for obtaining a list of contained targets. Skip 'universal' if it's there.
+    valid_dirs = [d for d in platform_variant_architecture_dirs if d != 'universal']
+    reference_dir_path = os.path.join(framework_os_path, valid_dirs[0])
     logging.debug('Using {0} as reference path for scanning '
                   'targets'.format(reference_dir_path))
     # Filter only .framework directories and make sure the framework is
@@ -218,9 +240,7 @@ def build_universal_framework(frameworks_path, targets):
       # Eg: split firebase_auth.framework -> firebase_auth, .framework
       target, _ = os.path.splitext(target_framework)
       for variant_architecture_dir in platform_variant_architecture_dirs:
-        # Since we have arm64 for both device and simulator, lipo cannot combine
-        # them in the same fat file. We ignore simulator-arm64.
-        if variant_architecture_dir == 'simulator-arm64':
+        if variant_architecture_dir == 'simulator-arm64' or variant_architecture_dir == 'universal':
           continue
         # <build_dir>/<apple_os>/frameworks/<platform-arch>/
         # <target>.framework/target
@@ -233,7 +253,7 @@ def build_universal_framework(frameworks_path, targets):
       universal_target_path = os.path.join(framework_os_path, 'universal',
                                           target_framework)
       logging.debug('Ensuring all directories exist: ' + universal_target_path)
-      os.makedirs(universal_target_path)
+      os.makedirs(universal_target_path, exist_ok=True)
       # <build_dir>/<apple_os>/frameworks/universal/<target>.framework/<target>
       universal_target_library_path = os.path.join(universal_target_path,
                                                    target)
@@ -259,7 +279,8 @@ def build_universal_framework(frameworks_path, targets):
                                                   'Headers')
 
     shutil.copytree(firebase_framework_headers_path,
-                    universal_firebase_framework_headers_path)
+                    universal_firebase_framework_headers_path,
+                    dirs_exist_ok=True)
 
 
 def build_xcframeworks(frameworks_path, xcframeworks_path, template_info_plist,
@@ -389,7 +410,7 @@ def build_xcframeworks(frameworks_path, xcframeworks_path, template_info_plist,
                                           xcframework_key,
                                           '{0}.framework'.format(target))
         logging.debug('Ensuring all directories exist: ' + library_output_dir)
-        os.makedirs(library_output_dir)
+        os.makedirs(library_output_dir, exist_ok=True)
         cmd = ['lipo', '-create']
         cmd.extend(xcframework_libraries)
         cmd.append('-output')
@@ -456,7 +477,7 @@ def cmake_configure(source_path, build_path, toolchain, archive_output_path,
         system. Used when building for ios/tvos. (eg:'arm64', 'x86_64')
       apple_os (str, optional): The Apple OS to build for.
   """
-  cmd = ['cmake', '-S', source_path, '-B', build_path]
+  cmd = ['cmake', '-S', source_path, '-B', build_path, '-G', 'Xcode']
   if toolchain:
     cmd.append('-DCMAKE_TOOLCHAIN_FILE={0}'.format(toolchain))
   elif apple_os == 'ios':
@@ -468,6 +489,8 @@ def cmake_configure(source_path, build_path, toolchain, archive_output_path,
     if platform_variant == 'simulator':
       cmd.append('-DCMAKE_OSX_SYSROOT=appletvsimulator')
   cmd.append('-DCMAKE_ARCHIVE_OUTPUT_DIRECTORY={0}'.format(archive_output_path))
+  cmd.append('-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={0}'.format(archive_output_path))
+  cmd.append('-DCMAKE_RUNTIME_OUTPUT_DIRECTORY={0}'.format(archive_output_path))
   if architecture:
     cmd.append('-DCMAKE_OSX_ARCHITECTURES={0}'.format(architecture))
   utils.run_command(cmd)
diff --git a/setup_integration_tests.py b/setup_integration_tests.py
index f4f7cd5869..e9bba2229e 100755
--- a/setup_integration_tests.py
+++ b/setup_integration_tests.py
@@ -57,3 +57,18 @@
     for src in FRAMEWORK_DIRECTORIES:
         print('Copying %s to %s' % (src, dest))
         copy_tree(src, dest, update=1)
+
+        # Workaround for Xcode 15 / Swift 5.10 Concurrency crash on iOS 15 and 16
+        pbxproj_path = os.path.join(dest, "integration_test.xcodeproj", "project.pbxproj")
+        if os.path.exists(pbxproj_path):
+            with open(pbxproj_path, "r") as f:
+                pbx_content = f.read()
+            if "-Wl,-weak-lswift_Concurrency" not in pbx_content:
+                pbx_content = pbx_content.replace(
+                    "buildSettings = {",
+                    "buildSettings = {\n\t\t\t\tOTHER_CPLUSPLUSFLAGS = \"$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY\";\n\t\t\t\tOTHER_LDFLAGS = \"-Wl,-weak-lswift_Concurrency\";"
+                )
+                with open(pbxproj_path, "w") as f:
+                    f.write(pbx_content)
+                print("Patched " + pbxproj_path + " for Swift Concurrency backwards compatibility.")
+
diff --git a/storage/integration_test/integration_test.xcodeproj/project.pbxproj b/storage/integration_test/integration_test.xcodeproj/project.pbxproj
index 4d0bde1f79..eaf61e41d1 100644
--- a/storage/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/storage/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -386,6 +386,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -429,6 +431,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -466,6 +470,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -499,6 +505,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -531,6 +539,8 @@
 		BC1D669F2679868B005DC2DA /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -588,6 +598,8 @@
 		BC1D66A02679868B005DC2DA /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = "App Icon & Top Shelf Image";
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ANALYZER_NONNULL = YES;
diff --git a/test_mac_ios_simulator.sh b/test_mac_ios_simulator.sh
old mode 100644
new mode 100755
index 7fc9fa5e3f..ec98fb58fc
--- a/test_mac_ios_simulator.sh
+++ b/test_mac_ios_simulator.sh
@@ -25,11 +25,8 @@ set -x
 mkdir -p mac_ios_simulator_build
 cd mac_ios_simulator_build
 
-# Configure cmake with tests enabled
-# and disable use of libsecret due to not working on kokoro builders
-cmake -DCMAKE_SYSTEM_NAME=iOS -DCMAKE_OSX_SYSROOT=iphonesimulator .. -DCLANG_ENABLE_MODULES=YES -DFIREBASE_CPP_BUILD_TESTS=ON -DFIREBASE_FORCE_FAKE_SECURE_STORAGE=ON "$@"
+cmake -G Xcode -DCMAKE_SYSTEM_NAME=iOS -DCMAKE_OSX_SYSROOT=iphonesimulator .. -DCLANG_ENABLE_MODULES=YES -DFIREBASE_CPP_BUILD_TESTS=ON -DFIREBASE_FORCE_FAKE_SECURE_STORAGE=ON "$@"
 
 # Build the SDK and the tests
-cpus=$(sysctl -n hw.ncpu)
-cmake --build . -- -j $(cpus)
+cmake --build .
 
diff --git a/testing/sample_framework/src/app_framework.cc b/testing/sample_framework/src/app_framework.cc
index bed0d01526..c432cf3c84 100644
--- a/testing/sample_framework/src/app_framework.cc
+++ b/testing/sample_framework/src/app_framework.cc
@@ -15,6 +15,9 @@
 #include "app_framework.h"  // NOLINT
 
 #include <inttypes.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <sys/stat.h>
 
 #include <algorithm>
@@ -23,6 +26,24 @@
 #include <cstring>
 #include <ctime>
 
+#if defined(__APPLE__)
+// Workaround for Xcode 15 / Swift 5.10 Concurrency and C++ verbose abort
+// crash on older iOS versions (iOS 15/16).
+// By providing these symbols in our own binary, we prevent dyld from
+// crashing when they are missing from the system libraries on older OSs.
+namespace std {
+inline namespace __1 {
+__attribute__((weak)) void __libcpp_verbose_abort(const char* format, ...) {
+  va_list list;
+  va_start(list, format);
+  vfprintf(stderr, format, list);
+  va_end(list);
+  abort();
+}
+}  // namespace __1
+}  // namespace std
+#endif
+
 namespace app_framework {
 
 // Base logging methods, implemented by platform-specific files.
diff --git a/ump/integration_test/integration_test.xcodeproj/project.pbxproj b/ump/integration_test/integration_test.xcodeproj/project.pbxproj
index 6b7651922e..8a4c20e749 100644
--- a/ump/integration_test/integration_test.xcodeproj/project.pbxproj
+++ b/ump/integration_test/integration_test.xcodeproj/project.pbxproj
@@ -214,6 +214,8 @@
 		529226F71C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -257,6 +259,8 @@
 		529226F81C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -294,6 +298,8 @@
 		529226FA1C85F68000C89379 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;
@@ -327,6 +333,8 @@
 		529226FB1C85F68000C89379 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				OTHER_CPLUSPLUSFLAGS = "$(inherited) -D_LIBCPP_HAS_NO_VERBOSE_ABORT -D_LIBCPP_DISABLE_AVAILABILITY";
+				OTHER_LDFLAGS = "$(inherited) -Wl,-weak-lswift_Concurrency";
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
 				CLANG_ENABLE_MODULES = YES;