Using swig_add_library in cmake

CMakeLists.txt

cmake_minimum_required(VERSION 3.21)
project(codebase_wrapper LANGUAGES CXX)

find_package(SWIG REQUIRED)
include(${SWIG_USE_FILE})

include_directories(${CMAKE_SOURCE_DIR})
set(SOURCES codebase_wrapper.i codebase.c)

set_property(SOURCE codebase_wrapper.i PROPERTY CPLUSPLUS ON)

swig_add_library(${PROJECT_NAME}
 TYPE SHARED
 LANGUAGE csharp
 OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/Generated"
 OUTFILE_DIR "${CMAKE_CURRENT_BINARY_DIR}/Wrapper"
 SOURCES ${SOURCES}
)

codebase.c

#include "codebase.h"
#include <stdlib.h>
#include <string.h>

__declspec(dllexport) void helloWorld()
{
}

codebase.h

// codebase.h
#ifndef CODEBASE_H
#define CODEBASE_H

__declspec(dllexport) typedef struct {
    int id;
} DataStruct;

__declspec(dllexport) void helloWorld();

#endif // CODEBASE_H

codebase_wrapper.i

%module codebase_wrapper
%{
#include "codebase.h"
%}

%include <windows.i>

%include "codebase.h"

Asked in: https://discourse.cmake.org/t/adding-cxx-sources-to-swig-add-library/13838