CMake Git 서브모듈 사용

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1. git submodule 추가

git submodule add https://github.com/nlohmann/json external/json

1. 최상위 CMakeLists.txt

cmake_minimum_required(VERSION 3.22)

project(CppProjectTemplate VERSION 1.0.0 LANGUAGES C CXX)

set(CMAKE_CXX_STANDARD          17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS        OFF)

set(LIBRARY_NAME Library)
set(EXECUTABLE_NAME Executable)

set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/")
include(AddGitSubmodule)

add_git_submodule(external/json)

add_subdirectory(configured)
add_subdirectory(external)
add_subdirectory(src)
add_subdirectory(app)

1. cmake/AddGitSubmodule.cmake

function(add_git_submodule relative_dir)
    find_package(Git REQUIRED)

    set(FULL_DIR ${CMAKE_SOURCE_DIR}/${relative_dir})

    if (NOT EXISTS ${FULL_DIR}/CMakeLists.txt)
        execute_process(COMMAND ${GIT_EXECUTABLE}
            submodule update --init --recursive -- ${relative_dir}
            WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})
    endif()

    if (EXISTS ${FULL_DIR}/CMakeLists.txt)
        message("Submodule is CMake Project: ${FULL_DIR}/CMakeLists.txt")
        add_subdirectory(${FULL_DIR})
    else()
        message("Submodule is NO CMake Project: ${FULL_DIR}")
    endif()
endfunction(add_git_submodule)

1. 이후 cmake .. & cmake –build .