Remove RN_FABRIC_ENABLED flag (facebook#41561)

Summary:
Pull Request resolved: facebook#41561

The RN_FABRIC_ENABLED has been deprecated and superseded by the RCT_NEW_ARCH_ENABLED for a while now.

This change removes it, from the codebase as now we always have the Fabric pod available to the codebase.

## Changelog
[Internal] - Remove RN_FABRIC_ENABLED flag

Reviewed By: dmytrorykun

Differential Revision: D51468332

fbshipit-source-id: 6b2fc554e6bf5ac748b9e45d7c14f9ba9b57820c

Author: cipolleschi

packages/react-native/Libraries/AppDelegate/React-RCTAppDelegate.podspec

@@ -24,9 +24,8 @@ use_hermes =  ENV['USE_HERMES'] == nil || ENV['USE_HERMES'] == '1'
 
 new_arch_enabled_flag = (is_new_arch_enabled ? " -DRCT_NEW_ARCH_ENABLED" : "")
 is_fabric_enabled = is_new_arch_enabled || ENV["RCT_FABRIC_ENABLED"]
-fabric_flag = (is_fabric_enabled ? " -DRN_FABRIC_ENABLED" : "")
 hermes_flag = (use_hermes ? " -DUSE_HERMES" : "")
-other_cflags = "$(inherited)" + folly_flags + new_arch_enabled_flag + fabric_flag + hermes_flag
+other_cflags = "$(inherited)" + folly_flags + new_arch_enabled_flag + hermes_flag
 
 header_search_paths = [
   "$(PODS_TARGET_SRCROOT)/../../ReactCommon",

packages/react-native/React/React-RCTFabric.podspec

@@ -58,7 +58,7 @@ Pod::Spec.new do |s|
   s.framework              = ["JavaScriptCore", "MobileCoreServices"]
   s.pod_target_xcconfig    = {
     "HEADER_SEARCH_PATHS" => header_search_paths,
-    "OTHER_CFLAGS" => "$(inherited) -DRN_FABRIC_ENABLED" + " " + folly_flags,
+    "OTHER_CFLAGS" => "$(inherited) " + folly_flags,
     "CLANG_CXX_LANGUAGE_STANDARD" => "c++20"
   }.merge!(ENV['USE_FRAMEWORKS'] != nil ? {
     "PUBLIC_HEADERS_FOLDER_PATH" => "#{module_name}.framework/Headers/#{header_dir}"

packages/react-native/ReactCommon/jsc/CMakeLists.txt

@@ -30,10 +30,6 @@ target_link_libraries(jscruntime
         jsi
         glog)
 
-# TODO: Remove this flag when ready.
-# Android has this enabled by default, but the flag is still needed for iOS.
-target_compile_options(jscruntime PRIVATE -DRN_FABRIC_ENABLED)
-
 if(NOT ${CMAKE_BUILD_TYPE} MATCHES Debug)
         target_compile_options(jscruntime PRIVATE -DNDEBUG)
 endif()

packages/react-native/ReactCommon/jsc/JSCRuntime.cpp

@@ -240,10 +240,7 @@ class JSCRuntime : public jsi::Runtime {
   static JSStringRef stringRef(const jsi::String& str);
   static JSStringRef stringRef(const jsi::PropNameID& sym);
   static JSObjectRef objectRef(const jsi::Object& obj);
-
-#ifdef RN_FABRIC_ENABLED
   static JSObjectRef objectRef(const jsi::WeakObject& obj);
-#endif
 
   // Factory methods for creating String/Object
   jsi::Symbol createSymbol(JSValueRef symbolRef) const;
@@ -1065,23 +1062,15 @@ jsi::Array JSCRuntime::getPropertyNames(const jsi::Object& obj) {
 }
 
 jsi::WeakObject JSCRuntime::createWeakObject(const jsi::Object& obj) {
-#ifdef RN_FABRIC_ENABLED
   // TODO: revisit this implementation
   JSObjectRef objRef = objectRef(obj);
   return make<jsi::WeakObject>(makeObjectValue(objRef));
-#else
-  throw std::logic_error("Not implemented");
-#endif
 }
 
 jsi::Value JSCRuntime::lockWeakObject(const jsi::WeakObject& obj) {
-#ifdef RN_FABRIC_ENABLED
   // TODO: revisit this implementation
   JSObjectRef objRef = objectRef(obj);
   return jsi::Value(createObject(objRef));
-#else
-  throw std::logic_error("Not implemented");
-#endif
 }
 
 jsi::Array JSCRuntime::createArray(size_t length) {
@@ -1527,12 +1516,10 @@ JSObjectRef JSCRuntime::objectRef(const jsi::Object& obj) {
   return static_cast<const JSCObjectValue*>(getPointerValue(obj))->obj_;
 }
 
-#ifdef RN_FABRIC_ENABLED
 JSObjectRef JSCRuntime::objectRef(const jsi::WeakObject& obj) {
   // TODO: revisit this implementation
   return static_cast<const JSCObjectValue*>(getPointerValue(obj))->obj_;
 }
-#endif
 
 void JSCRuntime::checkException(JSValueRef exc) {
   if (JSC_UNLIKELY(exc)) {

packages/react-native/ReactCommon/jsc/React-jsc.podspec

@@ -32,6 +32,6 @@ Pod::Spec.new do |s|
   s.dependency "React-jsi", version
 
   s.subspec "Fabric" do |ss|
-    ss.pod_target_xcconfig  = { "OTHER_CFLAGS" => "$(inherited) -DRN_FABRIC_ENABLED" }
+    ss.pod_target_xcconfig  = { "OTHER_CFLAGS" => "$(inherited)" }
   end
 end

packages/react-native/scripts/cocoapods/__tests__/utils-test.rb

@@ -790,68 +790,6 @@ def test_updateSearchPaths_whenNotUseFrameworks_addsSearchPaths
         end
     end
 
-    # ============================= #
-    # Test - Apply Flags For Fabric #
-    # ============================= #
-    def test_applyFlagsForFabric_whenFabricEnabled_addsTheFlag
-        # Arrange
-        first_target = prepare_target("FirstTarget")
-        second_target = prepare_target("SecondTarget")
-        third_target = prepare_target("ThirdTarget", "com.apple.product-type.bundle")
-        user_project_mock = UserProjectMock.new("a/path", [
-                prepare_config("Debug"),
-                prepare_config("Release"),
-            ],
-            :native_targets => [
-                first_target,
-                second_target
-            ]
-        )
-        pods_projects_mock = PodsProjectMock.new([third_target], {"hermes-engine" => {}})
-        installer = InstallerMock.new(pods_projects_mock, [
-            AggregatedProjectMock.new(user_project_mock)
-        ])
-
-        # Act
-        ReactNativePodsUtils.apply_flags_for_fabric(installer, fabric_enabled: true)
-
-        # Assert
-        user_project_mock.build_configurations.each do |config|
-            received_cflags = config.build_settings["OTHER_CFLAGS"]
-            expected_cflags = "$(inherited) -DRN_FABRIC_ENABLED"
-            assert_equal(received_cflags, expected_cflags)
-        end
-
-    end
-
-    def test_applyFlagsForFabric_whenFabricDisabled_doNothing
-        # Arrange
-        first_target = prepare_target("FirstTarget")
-        second_target = prepare_target("SecondTarget")
-        third_target = prepare_target("ThirdTarget", "com.apple.product-type.bundle")
-        user_project_mock = UserProjectMock.new("/a/path", [
-                prepare_config("Debug"),
-                prepare_config("Release"),
-            ],
-            :native_targets => [
-                first_target,
-                second_target
-            ]
-        )
-        pods_projects_mock = PodsProjectMock.new([third_target], {"hermes-engine" => {}})
-        installer = InstallerMock.new(pods_projects_mock, [
-            AggregatedProjectMock.new(user_project_mock)
-        ])
-
-        # Act
-        ReactNativePodsUtils.apply_flags_for_fabric(installer, fabric_enabled: false)
-
-        # Assert
-        user_project_mock.build_configurations.each do |config|
-            assert_equal(config.build_settings["OTHER_CFLAGS"], "$(inherited)")
-        end
-    end
-
     # ============================== #
     # Test - Apply ATS configuration #
     # ============================== #

packages/react-native/scripts/cocoapods/utils.rb

@@ -147,15 +147,6 @@ def self.apply_xcode_15_patch(installer, xcodebuild_manager: Xcodebuild)
 
     end
 
-    def self.apply_flags_for_fabric(installer, fabric_enabled: false)
-        fabric_flag = "-DRN_FABRIC_ENABLED"
-        if fabric_enabled
-            self.add_compiler_flag_to_project(installer, fabric_flag)
-        else
-            self.remove_compiler_flag_from_project(installer, fabric_flag)
-        end
-    end
-
     private
 
     def self.add_build_settings_to_pod(installer, settings_name, settings_value, target_pod_name, configuration)

packages/react-native/scripts/react_native_pods.rb

@@ -281,7 +281,6 @@ def react_native_post_install(
   ReactNativePodsUtils.update_search_paths(installer)
   ReactNativePodsUtils.set_use_hermes_build_setting(installer, hermes_enabled)
   ReactNativePodsUtils.set_node_modules_user_settings(installer, react_native_path)
-  ReactNativePodsUtils.apply_flags_for_fabric(installer, fabric_enabled: fabric_enabled)
   ReactNativePodsUtils.apply_xcode_15_patch(installer)
   ReactNativePodsUtils.apply_ats_config(installer)
   ReactNativePodsUtils.updateOSDeploymentTarget(installer)

packages/rn-tester/RNTesterPods.xcodeproj/project.pbxproj

@@ -933,18 +933,14 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 13.4;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
-				OTHER_CFLAGS = (
-					"$(inherited)",
-					"-DRN_FABRIC_ENABLED",
-				);
+				OTHER_CFLAGS = "$(inherited)";
 				OTHER_CPLUSPLUSFLAGS = (
 					"$(OTHER_CFLAGS)",
 					"-DFOLLY_NO_CONFIG",
 					"-DFOLLY_MOBILE=1",
 					"-DFOLLY_USE_LIBCPP=1",
 					"-DFOLLY_CFG_NO_COROUTINES=1",
 					"-DFOLLY_HAVE_CLOCK_GETTIME=1",
-					"-DRN_FABRIC_ENABLED",
 				);
 				OTHER_LDFLAGS = (
 					"-ObjC",
@@ -1029,18 +1025,14 @@
 				);
 				IPHONEOS_DEPLOYMENT_TARGET = 13.4;
 				MTL_ENABLE_DEBUG_INFO = NO;
-				OTHER_CFLAGS = (
-					"$(inherited)",
-					"-DRN_FABRIC_ENABLED",
-				);
+				OTHER_CFLAGS = "$(inherited)";
 				OTHER_CPLUSPLUSFLAGS = (
 					"$(OTHER_CFLAGS)",
 					"-DFOLLY_NO_CONFIG",
 					"-DFOLLY_MOBILE=1",
 					"-DFOLLY_USE_LIBCPP=1",
 					"-DFOLLY_CFG_NO_COROUTINES=1",
 					"-DFOLLY_HAVE_CLOCK_GETTIME=1",
-					"-DRN_FABRIC_ENABLED",
 				);
 				OTHER_LDFLAGS = (
 					"-ObjC",