[RN][IOS] Fix flags for new arch

Author: cipolleschi

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

@@ -128,7 +128,7 @@ def test_installModulesDependencies_whenNewArchEnabledAndNewArchAndNoSearchPaths
         NewArchitectureHelper.install_modules_dependencies(spec, true, '2021.07.22.00')
 
         # Assert
-        assert_equal(spec.compiler_flags, NewArchitectureHelper.folly_compiler_flags)
+        assert_equal(spec.compiler_flags, "$(inherited) #{NewArchitectureHelper.folly_compiler_flags} -DRCT_NEW_ARCH_ENABLED=1")
         assert_equal(spec.pod_target_xcconfig["HEADER_SEARCH_PATHS"], "\"$(PODS_ROOT)/boost\" \"$(PODS_ROOT)/DoubleConversion\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers/react/renderer/graphics/platform/ios\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-Fabric/React_Fabric.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers/react/nativemodule/core\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-RCTFabric/RCTFabric.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-utils/React_utils.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-debug/React_debug.framework/Headers\"")
         assert_equal(spec.pod_target_xcconfig["CLANG_CXX_LANGUAGE_STANDARD"], "c++17")
         assert_equal(spec.pod_target_xcconfig["OTHER_CPLUSPLUSFLAGS"], "$(inherited) -DRCT_NEW_ARCH_ENABLED=1 -DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1")
@@ -166,7 +166,7 @@ def test_installModulesDependencies_whenNewArchDisabledAndSearchPathsAndCompiler
         NewArchitectureHelper.install_modules_dependencies(spec, false, '2021.07.22.00')
 
         # Assert
-        assert_equal(spec.compiler_flags, "-Wno-nullability-completeness #{NewArchitectureHelper.folly_compiler_flags}")
+        assert_equal(spec.compiler_flags, "$(inherited) -Wno-nullability-completeness #{NewArchitectureHelper.folly_compiler_flags}")
         assert_equal(spec.pod_target_xcconfig["HEADER_SEARCH_PATHS"], "#{other_flags} \"$(PODS_ROOT)/boost\" \"$(PODS_ROOT)/DoubleConversion\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers/react/renderer/graphics/platform/ios\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-Fabric/React_Fabric.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers/react/nativemodule/core\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-RCTFabric/RCTFabric.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-utils/React_utils.framework/Headers\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-debug/React_debug.framework/Headers\"")
         assert_equal(spec.pod_target_xcconfig["CLANG_CXX_LANGUAGE_STANDARD"], "c++17")
         assert_equal(

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

@@ -87,6 +87,10 @@ def self.install_modules_dependencies(spec, new_arch_enabled, folly_version)
         current_config = hash["pod_target_xcconfig"] != nil ? hash["pod_target_xcconfig"] : {}
         current_headers = current_config["HEADER_SEARCH_PATHS"] != nil ? current_config["HEADER_SEARCH_PATHS"] : ""
 
+        flags_to_add = new_arch_enabled ?
+            "#{@@folly_compiler_flags} -DRCT_NEW_ARCH_ENABLED=1" :
+            "#{@@folly_compiler_flags}"
+
         header_search_paths = ["\"$(PODS_ROOT)/boost\""]
         if ENV['USE_FRAMEWORKS']
             header_search_paths << "\"$(PODS_ROOT)/DoubleConversion\""
@@ -100,7 +104,7 @@ def self.install_modules_dependencies(spec, new_arch_enabled, folly_version)
             header_search_paths << "\"${PODS_CONFIGURATION_BUILD_DIR}/React-debug/React_debug.framework/Headers\""
         end
         header_search_paths_string = header_search_paths.join(" ")
-        spec.compiler_flags = compiler_flags.empty? ? @@folly_compiler_flags : "#{compiler_flags} #{@@folly_compiler_flags}"
+        spec.compiler_flags = compiler_flags.empty? ? "$(inherited) #{flags_to_add}" : "$(inherited) #{compiler_flags} #{flags_to_add}"
         current_config["HEADER_SEARCH_PATHS"] = current_headers.empty? ?
             header_search_paths_string :
             "#{current_headers} #{header_search_paths_string}"