mirror of
https://github.com/nlohmann/json.git
synced 2024-12-12 03:49:22 +08:00
33a2154f8d
CMake convention is to use a project namespace, i.e. Foo::, for imported targets. When multiple targets are imported from a project, this looks like Foo::Bar1 Foo::Bar2, etc. This adds the nlohmann_json:: namespace to the exported target names. This also allows the generated project config files to be used from the build directory instead of just the install directory.
124 lines
3.7 KiB
CMake
124 lines
3.7 KiB
CMake
cmake_minimum_required(VERSION 3.8)
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##
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## PROJECT
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## name and version
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##
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project(nlohmann_json VERSION 3.1.2 LANGUAGES CXX)
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##
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## INCLUDE
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##
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##
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include(ExternalProject)
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##
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## OPTIONS
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##
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option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON)
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option(JSON_MultipleHeaders "Use non-amalgamated version of the library." OFF)
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##
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## CONFIGURATION
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##
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set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
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set(NLOHMANN_JSON_CONFIG_INSTALL_DIR "lib/cmake/${PROJECT_NAME}"
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CACHE INTERNAL "")
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set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR "include")
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set(NLOHMANN_JSON_TARGETS_EXPORT_NAME "${PROJECT_NAME}Targets")
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set(NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE "cmake/config.cmake.in")
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set(NLOHMANN_JSON_CMAKE_CONFIG_DIR "${CMAKE_CURRENT_BINARY_DIR}")
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set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
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set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
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set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake")
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if (JSON_MultipleHeaders)
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set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
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message(STATUS "Using the multi-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
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else()
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set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/single_include/")
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message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
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endif()
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##
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## TARGET
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## create target and add include path
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##
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add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
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add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_TARGET_NAME})
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target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11)
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target_include_directories(
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${NLOHMANN_JSON_TARGET_NAME}
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INTERFACE
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$<BUILD_INTERFACE:${NLOHMANN_JSON_INCLUDE_BUILD_DIR}>
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$<INSTALL_INTERFACE:include>
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)
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## add debug view definition file for msvc (natvis)
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if (MSVC)
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set(NLOHMANN_ADD_NATVIS TRUE)
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set(NLOHMANN_NATVIS_FILE "nlohmann_json.natvis")
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target_sources(
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${NLOHMANN_JSON_TARGET_NAME}
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INTERFACE
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$<INSTALL_INTERFACE:${NLOHMANN_NATVIS_FILE}>
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$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${NLOHMANN_NATVIS_FILE}>
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)
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endif()
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##
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## TESTS
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## create and configure the unit test target
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##
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include(CTest) #adds option BUILD_TESTING (default ON)
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if(BUILD_TESTING AND JSON_BuildTests)
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enable_testing()
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add_subdirectory(test)
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endif()
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##
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## INSTALL
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## install header files, generate and install cmake config files for find_package()
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##
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include(CMakePackageConfigHelpers)
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write_basic_package_version_file(
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${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE} COMPATIBILITY SameMajorVersion
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)
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configure_package_config_file(
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${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE}
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${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE}
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INSTALL_DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
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)
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install(
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DIRECTORY ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}
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DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
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)
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install(
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FILES ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
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DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
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)
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if (NLOHMANN_ADD_NATVIS)
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install(
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FILES ${NLOHMANN_NATVIS_FILE}
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DESTINATION .
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)
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endif()
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export(
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TARGETS ${NLOHMANN_JSON_TARGET_NAME}
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NAMESPACE ${PROJECT_NAME}::
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FILE ${NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE}
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)
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install(
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TARGETS ${NLOHMANN_JSON_TARGET_NAME}
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EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
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INCLUDES DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
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)
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install(
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EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
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NAMESPACE ${PROJECT_NAME}::
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DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
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)
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