initial commit

Sources/CMakeLists.txt

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+add_subdirectory(SwiftFrontend)
+add_subdirectory(CppBackend)

Sources/CppBackend/CMakeLists.txt

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+add_library(CppBackend STATIC backend.h backend.cpp)
+
+set_target_properties(CppBackend PROPERTIES Swift_MODULE_NAME "CppBackend")
+target_compile_options(CppBackend PUBLIC "$<$<COMPILE_LANGUAGE:Swift>:-cxx-interoperability-mode=default>")

Sources/CppBackend/backend.cpp

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+#include "backend.h"
+
+#include <iostream>
+
+void backend_init() {
+  std::cout << "Hello World" << std::endl;
+}

Sources/CppBackend/backend.h

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+#pragma once
+
+void backend_init();

Sources/CppBackend/module.modulemap

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+module CppBackend {
+  header "backend.h"
+}

Sources/SwiftFrontend/CMakeLists.txt

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+add_executable(SwiftFrontend main.swift)
+target_link_libraries(SwiftFrontend PRIVATE CppBackend)

Sources/SwiftFrontend/main.swift

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+import CppBackend
+
+backend_init()
+print("Hello World")