AK+Meta: Add SwiftAK module to add helpers to construct swift Strings

This allows constructing Foundation.Data and Swift.String without
unnecessary copies from AK.StringView and AK.String respectively.

AK/AK+Swift.swift

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+import AK
+import Foundation
+
+public extension Foundation.Data {
+    init(_ string: AK.StringView) {
+        let bytes = string.bytes()
+        self.init(bytesNoCopy: UnsafeMutableRawPointer(mutating: bytes.data()), count: bytes.size(), deallocator: .none)
+    }
+}
+
+public extension Swift.String {
+    init?(_ string: AK.String) {
+        self.init(data: Foundation.Data(string.__bytes_as_string_viewUnsafe()), encoding: .utf8)
+    }
+
+    init?(_ string: AK.StringView) {
+        self.init(data: Foundation.Data(string), encoding: .utf8)
+    }
+}

AK/CMakeLists.txt

@@ -68,4 +68,8 @@ if (ENABLE_SWIFT)
         "${CMAKE_CURRENT_BINARY_DIR}/Backtrace.h"
         "${CMAKE_CURRENT_BINARY_DIR}/Debug.h"
     )
+
+    target_compile_features(AK PUBLIC cxx_std_23)
+    set_target_properties(AK PROPERTIES Swift_MODULE_NAME SwiftAK)
+    target_sources(AK PRIVATE AK+Swift.swift)
 endif()

Meta/CMake/Swift/GenerateSwiftHeader.cmake

@@ -36,10 +36,12 @@ function(_swift_generate_cxx_header target header)
 
   if(APPLE)
     set(SDK_FLAGS "-sdk" "${CMAKE_OSX_SYSROOT}")
+    list(APPEND SDK_FLAGS "-target" "${CMAKE_Swift_COMPILER_TARGET}")
   elseif(WIN32)
     set(SDK_FLAGS "-sdk" "$ENV{SDKROOT}")
   elseif(DEFINED ${CMAKE_SYSROOT})
     set(SDK_FLAGS "-sdk" "${CMAKE_SYSROOT}")
+    list(APPEND SDK_FLAGS "-target" "${CMAKE_Swift_COMPILER_TARGET}")
   endif()
 
   cmake_path(APPEND CMAKE_CURRENT_BINARY_DIR include

Meta/CMake/lagom_install_options.cmake

@@ -15,6 +15,10 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${IN_BUILD_PREFIX}${CMAK
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${IN_BUILD_PREFIX}${CMAKE_INSTALL_LIBDIR}")
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${IN_BUILD_PREFIX}${CMAKE_INSTALL_LIBDIR}")
 
+# FIXME: Stop setting this when we have a good way to retrieve the directory that has the swift module
+#        file for use by the swift frontend's header generator
+set(CMAKE_Swift_MODULE_DIRECTORY  "${CMAKE_BINARY_DIR}/${IN_BUILD_PREFIX}swift")
+
 set(CMAKE_SKIP_BUILD_RPATH FALSE)
 set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
 # See slide 100 of the following ppt :^)