Fix Xcode 15 RC issues (facebook#39474)

Summary:
Pull Request resolved: facebook#39474

When it comes to Xcode 15 RC, we are aware of two issues:
1. `unary_function` and `binary_function` not available in Cxx17
2. [Weak linking](https://developer.apple.com/documentation/xcode-release-notes/xcode-15-release-notes#Linking) is not supported anymore.

This change should fix both of the issues, adding the flags to allow for `unary_function`and `binary_function` to be called and adding the `-Wl -ld_classic` flag to `OTHER_LDFLAGS` in case Xcode 15 is detected.

## Changelog:
[Internal] - add the `_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION` and the `-Wl -ld_classic` flags to projects when needed

Reviewed By: dmytrorykun

Differential Revision: D49319256

fbshipit-source-id: cd93f0ad5c798cb9239e3454d0e9c38164ccc3e4

packages/react-native/scripts/cocoapods/__tests__/test_utils/XcodebuildMock.rb

@@ -0,0 +1,26 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+class XcodebuildMock < Xcodebuild
+    @@version = ""
+    @@version_invocation_count = 0
+
+    def self.set_version=(v)
+      @@version = v
+    end
+
+    def self.version
+        @@version_invocation_count += 1
+        @@version
+    end
+
+    def self.version_invocation_count
+        @@version_invocation_count
+    end
+
+    def self.reset()
+        @@version_invocation_count = 0
+    end
+end

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

@@ -15,6 +15,7 @@
 require_relative "./test_utils/PathnameMock.rb"
 require_relative "./test_utils/TargetDefinitionMock.rb"
 require_relative "./test_utils/XcodeprojMock.rb"
+require_relative "./test_utils/XcodebuildMock.rb"
 
 class UtilsTests < Test::Unit::TestCase
     def setup
@@ -30,6 +31,7 @@ def teardown
         SysctlChecker.reset()
         Environment.reset()
         Xcodeproj::Plist.reset()
+        XcodebuildMock.reset()
         ENV['RCT_NEW_ARCH_ENABLED'] = '0'
         ENV['USE_HERMES'] = '1'
         ENV['USE_FRAMEWORKS'] = nil
@@ -526,9 +528,56 @@ def test_applyMacCatalystPatches_correctlyAppliesNecessaryPatches
     # ================================= #
     # Test - Apply Xcode 15 Patch       #
     # ================================= #
+    def test_applyXcode15Patch_whenXcodebuild14_correctlyAppliesNecessaryPatch
+        # Arrange
+        XcodebuildMock.set_version = "Xcode 14.3"
+        first_target = prepare_target("FirstTarget")
+        second_target = prepare_target("SecondTarget")
+        third_target = TargetMock.new("ThirdTarget", [
+            BuildConfigurationMock.new("Debug", {
+              "GCC_PREPROCESSOR_DEFINITIONS" => '$(inherited) "SomeFlag=1" '
+            }),
+            BuildConfigurationMock.new("Release", {
+              "GCC_PREPROCESSOR_DEFINITIONS" => '$(inherited) "SomeFlag=1" '
+            }),
+        ], nil)
 
-    def test_applyXcode15Patch_correctlyAppliesNecessaryPatch
+        user_project_mock = UserProjectMock.new("/a/path", [
+                prepare_config("Debug"),
+                prepare_config("Release"),
+            ],
+            :native_targets => [
+                first_target,
+                second_target
+            ]
+        )
+        pods_projects_mock = PodsProjectMock.new([], {"hermes-engine" => {}}, :native_targets => [
+            third_target
+        ])
+        installer = InstallerMock.new(pods_projects_mock, [
+            AggregatedProjectMock.new(user_project_mock)
+        ])
+
+        # Act
+        user_project_mock.build_configurations.each do |config|
+            assert_nil(config.build_settings["OTHER_LDFLAGS"])
+        end
+
+        ReactNativePodsUtils.apply_xcode_15_patch(installer, :xcodebuild_manager => XcodebuildMock)
+
+        # Assert
+        user_project_mock.build_configurations.each do |config|
+            assert_equal("$(inherited) _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION", config.build_settings["GCC_PREPROCESSOR_DEFINITIONS"])
+            assert_equal("$(inherited) ", config.build_settings["OTHER_LDFLAGS"])
+        end
+
+        # User project and Pods project
+        assert_equal(2, XcodebuildMock.version_invocation_count)
+    end
+
+    def test_applyXcode15Patch_whenXcodebuild15_correctlyAppliesNecessaryPatch
         # Arrange
+        XcodebuildMock.set_version = "Xcode 15.0"
         first_target = prepare_target("FirstTarget")
         second_target = prepare_target("SecondTarget")
         third_target = TargetMock.new("ThirdTarget", [
@@ -557,24 +606,70 @@ def test_applyXcode15Patch_correctlyAppliesNecessaryPatch
         ])
 
         # Act
-        ReactNativePodsUtils.apply_xcode_15_patch(installer)
+        user_project_mock.build_configurations.each do |config|
+            assert_nil(config.build_settings["OTHER_LDFLAGS"])
+        end
+
+        ReactNativePodsUtils.apply_xcode_15_patch(installer, :xcodebuild_manager => XcodebuildMock)
 
         # Assert
-        first_target.build_configurations.each do |config|
-            assert_equal(config.build_settings["GCC_PREPROCESSOR_DEFINITIONS"].strip,
-                '$(inherited) "_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION"'
-            )
+        user_project_mock.build_configurations.each do |config|
+            assert_equal("$(inherited) _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION", config.build_settings["GCC_PREPROCESSOR_DEFINITIONS"])
+            assert_equal("$(inherited) -Wl -ld_classic ", config.build_settings["OTHER_LDFLAGS"])
         end
-        second_target.build_configurations.each do |config|
-            assert_equal(config.build_settings["GCC_PREPROCESSOR_DEFINITIONS"].strip,
-                '$(inherited) "_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION"'
-            )
+
+        # User project and Pods project
+        assert_equal(2, XcodebuildMock.version_invocation_count)
+    end
+
+    def test_applyXcode15Patch_whenXcodebuild14ButProjectHasSettings_correctlyRemovesNecessaryPatch
+        # Arrange
+        XcodebuildMock.set_version = "Xcode 14.3"
+        first_target = prepare_target("FirstTarget")
+        second_target = prepare_target("SecondTarget")
+        third_target = TargetMock.new("ThirdTarget", [
+            BuildConfigurationMock.new("Debug", {
+              "GCC_PREPROCESSOR_DEFINITIONS" => '$(inherited) "SomeFlag=1" '
+            }),
+            BuildConfigurationMock.new("Release", {
+              "GCC_PREPROCESSOR_DEFINITIONS" => '$(inherited) "SomeFlag=1" '
+            }),
+        ], nil)
+
+        debug_config = prepare_config("Debug", {"OTHER_LDFLAGS" => "$(inherited) -Wl -ld_classic "})
+        release_config = prepare_config("Release", {"OTHER_LDFLAGS" => "$(inherited) -Wl -ld_classic "})
+
+        user_project_mock = UserProjectMock.new("/a/path", [
+                debug_config,
+                release_config,
+            ],
+            :native_targets => [
+                first_target,
+                second_target
+            ]
+        )
+        pods_projects_mock = PodsProjectMock.new([debug_config.clone, release_config.clone], {"hermes-engine" => {}}, :native_targets => [
+            third_target
+        ])
+        installer = InstallerMock.new(pods_projects_mock, [
+            AggregatedProjectMock.new(user_project_mock)
+        ])
+
+        # Act
+        user_project_mock.build_configurations.each do |config|
+            assert_equal("$(inherited) -Wl -ld_classic ", config.build_settings["OTHER_LDFLAGS"])
         end
-        third_target.build_configurations.each do |config|
-            assert_equal(config.build_settings["GCC_PREPROCESSOR_DEFINITIONS"].strip,
-                '$(inherited) "SomeFlag=1" "_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION"'
-            )
+
+        ReactNativePodsUtils.apply_xcode_15_patch(installer, :xcodebuild_manager => XcodebuildMock)
+
+        # Assert
+        user_project_mock.build_configurations.each do |config|
+            assert_equal("$(inherited) _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION", config.build_settings["GCC_PREPROCESSOR_DEFINITIONS"])
+            assert_equal("$(inherited) ", config.build_settings["OTHER_LDFLAGS"])
         end
+
+        # User project and Pods project
+        assert_equal(2, XcodebuildMock.version_invocation_count)
     end
 
     # ==================================== #
@@ -923,12 +1018,14 @@ def prepare_user_project_mock_with_plists
     ])
 end
 
-def prepare_config(config_name)
-    return BuildConfigurationMock.new(config_name, {"LIBRARY_SEARCH_PATHS" => [
+def prepare_config(config_name, extra_config = {})
+    config = {"LIBRARY_SEARCH_PATHS" => [
         "$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)",
         "\"$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)\"",
         "another/path",
-    ]})
+    ]}.merge(extra_config)
+
+    return BuildConfigurationMock.new(config_name, config)
 end
 
 def prepare_target(name, product_type = nil, dependencies = [])

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

@@ -11,6 +11,14 @@ def call_sysctl_arm64
     end
 end
 
+# Helper class that is used to easily send commands to Xcodebuild
+# And that can be subclassed for testing purposes.
+class Xcodebuild
+    def self.version
+        `xcodebuild -version`
+    end
+end
+
 # Helper object to wrap system properties like RUBY_PLATFORM
 # This makes it easier to mock the behaviour in tests
 class Environment

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

@@ -152,16 +152,31 @@ def self.apply_mac_catalyst_patches(installer)
         end
     end
 
-    def self.apply_xcode_15_patch(installer)
-        installer.target_installation_results.pod_target_installation_results
-            .each do |pod_name, target_installation_result|
-                target_installation_result.native_target.build_configurations.each do |config|
-                    # unary_function and binary_function are no longer provided in c++20 and newer standard modes as part of Xcode 15. They can be re-enabled with setting _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION
-                    # Ref: https://developer.apple.com/documentation/xcode-release-notes/xcode-15-release-notes#Deprecations
-                    config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= '$(inherited) '
-                    config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] << '"_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION" '
+    def self.apply_xcode_15_patch(installer, xcodebuild_manager: Xcodebuild)
+        projects = self.extract_projects(installer)
+
+        gcc_preprocessor_definition_key = 'GCC_PREPROCESSOR_DEFINITIONS'
+        other_ld_flags_key = 'OTHER_LDFLAGS'
+        libcpp_cxx17_fix = '_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION'
+        xcode15_compatibility_flags = '-Wl -ld_classic '
+
+        projects.each do |project|
+            project.build_configurations.each do |config|
+                # fix for unary_function and binary_function
+                self.safe_init(config, gcc_preprocessor_definition_key)
+                self.add_value_to_setting_if_missing(config, gcc_preprocessor_definition_key, libcpp_cxx17_fix)
+
+                # fix for weak linking
+                self.safe_init(config, other_ld_flags_key)
+                if self.is_using_xcode15_or_greter(:xcodebuild_manager => xcodebuild_manager)
+                    self.add_value_to_setting_if_missing(config, other_ld_flags_key, xcode15_compatibility_flags)
+                else
+                    self.remove_value_to_setting_if_present(config, other_ld_flags_key, xcode15_compatibility_flags)
+                end
             end
+            project.save()
         end
+
     end
 
     def self.apply_flags_for_fabric(installer, fabric_enabled: false)
@@ -323,6 +338,49 @@ def self.extract_projects(installer)
             .push(installer.pods_project)
     end
 
+    def self.safe_init(config, setting_name)
+        old_config = config.build_settings[setting_name]
+        if old_config == nil
+            config.build_settings[setting_name] ||= '$(inherited) '
+        end
+    end
+
+    def self.add_value_to_setting_if_missing(config, setting_name, value)
+        old_config = config.build_settings[setting_name]
+        if !old_config.include?(value)
+            config.build_settings[setting_name] << value
+        end
+    end
+
+    def self.remove_value_to_setting_if_present(config, setting_name, value)
+        old_config = config.build_settings[setting_name]
+        if old_config.include?(value)
+            # Old config can be either an Array or a String
+            if old_config.is_a?(Array)
+                old_config = old_config.join(" ")
+            end
+            new_config = old_config.gsub(value,  "")
+            config.build_settings[setting_name] = new_config
+        end
+    end
+
+    def self.is_using_xcode15_or_greter(xcodebuild_manager: Xcodebuild)
+        xcodebuild_version = xcodebuild_manager.version
+
+        # The output of xcodebuild -version is something like
+        # Xcode 15.0
+        # or
+        # Xcode 14.3.1
+        # We want to capture the version digits
+        regex = /(\d+)\.(\d+)(?:\.(\d+))?/
+        if match_data = xcodebuild_version.match(regex)
+            major = match_data[1].to_i
+            return major >= 15
+        end
+
+        return false
+    end
+
     def self.add_compiler_flag_to_project(installer, flag, configuration: nil)
         projects = self.extract_projects(installer)