119 lines
3.7 KiB
CMake
119 lines
3.7 KiB
CMake
cmake_minimum_required(VERSION 3.0.0)
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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 3.0.1 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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##
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## CONFIGURATION
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##
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set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
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set(NLOHMANN_JSON_SOURCE_DIR "src")
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set(NLOHMANN_JSON_CONFIG_INSTALL_DIR "lib/cmake/${PROJECT_NAME}")
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set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR "include")
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set(NLOHMANN_JSON_HEADER_INSTALL_DIR "${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}/nlohmann")
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set(NLOHMANN_JSON_TARGETS_EXPORT_NAME "${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 "${CMAKE_CURRENT_BINARY_DIR}/cmake_config")
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set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${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}/${PROJECT_NAME}Config.cmake")
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##
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## TARGET
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## create target and add include path
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##
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add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
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target_include_directories(
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${NLOHMANN_JSON_TARGET_NAME}
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INTERFACE
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$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src>
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$<INSTALL_INTERFACE:include>
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)
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## add debug view defintion file for msvc (natvis) [cmake <= 3.2.2 does not support export of source files]
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if (MSVC AND CMAKE_VERSION VERSION_GREATER "3.2.2")
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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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include_directories(${NLOHMANN_JSON_SOURCE_DIR})
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add_subdirectory(test)
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endif()
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ExternalProject_Add(amalgamate
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GIT_REPOSITORY "https://github.com/theodelrieu/Amalgamate"
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CMAKE_ARGS "-DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}"
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)
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# There is no way to tell amalgamate to force-write the output file even if it already exists...
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add_custom_target(single_header ALL rm -f "${CMAKE_SOURCE_DIR}/single_header/json.hpp"
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COMMENT "Amalgamating json.hpp..."
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WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/${NLOHMANN_JSON_SOURCE_DIR}
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DEPENDS amalgamate
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COMMAND "${CMAKE_BINARY_DIR}/bin/amalgamate" -w '*.hpp' -i . json.hpp "${CMAKE_SOURCE_DIR}/single_header/json.hpp"
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)
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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_SOURCE_DIR}
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DESTINATION ${NLOHMANN_JSON_HEADER_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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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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DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
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)
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