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https://github.com/nlohmann/json.git
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fac07e22c5
Starting with CMake 3.27, deprecation warnings are issued when asking for policy settings for CMake 3.4 or earlier. The cmake_minimum_required() command accepts a version range, which allows NEW policy settings up to the upper end of that range to be used, but without raising the minimum CMake version above the bottom of that range. This means NEW policy settings will be used where available, without requiring them. This change updates the project's cmake_minimum_required() calls to use a version range to extend the upper policy version to 3.14 where it wasn't already at that version or higher. This prevents the deprecation warning from CMake 3.27, and gives breathing space before a future CMake release will start issuing similar deprecation warnings again.
210 lines
7 KiB
CMake
210 lines
7 KiB
CMake
cmake_minimum_required(VERSION 3.1...3.14)
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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 3.11.2 LANGUAGES CXX)
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##
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## MAIN_PROJECT CHECK
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## determine if nlohmann_json is built as a subproject (using add_subdirectory) or if it is the main project
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##
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set(MAIN_PROJECT OFF)
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if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
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set(MAIN_PROJECT ON)
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endif()
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##
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## INCLUDE
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##
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##
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set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
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include(ExternalProject)
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##
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## OPTIONS
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##
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if (POLICY CMP0077)
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# Allow CMake 3.13+ to override options when using FetchContent / add_subdirectory.
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cmake_policy(SET CMP0077 NEW)
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endif ()
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# VERSION_GREATER_EQUAL is not available in CMake 3.1
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if(${MAIN_PROJECT} AND (${CMAKE_VERSION} VERSION_EQUAL 3.13 OR ${CMAKE_VERSION} VERSION_GREATER 3.13))
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set(JSON_BuildTests_INIT ON)
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else()
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set(JSON_BuildTests_INIT OFF)
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endif()
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option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ${JSON_BuildTests_INIT})
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option(JSON_CI "Enable CI build targets." OFF)
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option(JSON_Diagnostics "Use extended diagnostic messages." OFF)
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option(JSON_GlobalUDLs "Place use-defined string literals in the global namespace." ON)
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option(JSON_ImplicitConversions "Enable implicit conversions." ON)
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option(JSON_DisableEnumSerialization "Disable default integer enum serialization." OFF)
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option(JSON_LegacyDiscardedValueComparison "Enable legacy discarded value comparison." OFF)
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option(JSON_Install "Install CMake targets during install step." ${MAIN_PROJECT})
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option(JSON_MultipleHeaders "Use non-amalgamated version of the library." ON)
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option(JSON_SystemInclude "Include as system headers (skip for clang-tidy)." OFF)
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if (JSON_CI)
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include(ci)
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endif ()
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##
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## CONFIGURATION
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##
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include(GNUInstallDirs)
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set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
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set(NLOHMANN_JSON_CONFIG_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/cmake/${PROJECT_NAME}" CACHE INTERNAL "")
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set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}")
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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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set(NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/pkgconfig")
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if (JSON_MultipleHeaders)
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set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${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 ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
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endif()
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if (NOT JSON_ImplicitConversions)
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message(STATUS "Implicit conversions are disabled")
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endif()
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if (JSON_DisableEnumSerialization)
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message(STATUS "Enum integer serialization is disabled")
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endif()
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if (JSON_LegacyDiscardedValueComparison)
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message(STATUS "Legacy discarded value comparison enabled")
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endif()
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if (JSON_Diagnostics)
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message(STATUS "Diagnostics enabled")
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endif()
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if (JSON_SystemInclude)
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set(NLOHMANN_JSON_SYSTEM_INCLUDE "SYSTEM")
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endif()
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##
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## TARGET
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## create target and add include path
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##
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add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
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add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_TARGET_NAME})
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if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
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target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_range_for)
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else()
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target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11)
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endif()
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target_compile_definitions(
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${NLOHMANN_JSON_TARGET_NAME}
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INTERFACE
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$<$<NOT:$<BOOL:${JSON_GlobalUDLs}>>:JSON_USE_GLOBAL_UDLS=0>
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$<$<NOT:$<BOOL:${JSON_ImplicitConversions}>>:JSON_USE_IMPLICIT_CONVERSIONS=0>
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$<$<BOOL:${JSON_DisableEnumSerialization}>:JSON_DISABLE_ENUM_SERIALIZATION=1>
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$<$<BOOL:${JSON_Diagnostics}>:JSON_DIAGNOSTICS=1>
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$<$<BOOL:${JSON_LegacyDiscardedValueComparison}>:JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1>
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)
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target_include_directories(
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${NLOHMANN_JSON_TARGET_NAME}
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${NLOHMANN_JSON_SYSTEM_INCLUDE} 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}/${NLOHMANN_NATVIS_FILE}>
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)
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endif()
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# Install a pkg-config file, so other tools can find this.
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CONFIGURE_FILE(
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"${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkg-config.pc.in"
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"${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
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)
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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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if (JSON_BuildTests)
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include(CTest)
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enable_testing()
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add_subdirectory(tests)
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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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# use a custom package version config file instead of
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# write_basic_package_version_file to ensure that it's architecture-independent
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# https://github.com/nlohmann/json/issues/1697
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configure_file(
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"cmake/nlohmann_jsonConfigVersion.cmake.in"
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${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
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@ONLY
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)
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configure_file(
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${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE}
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${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE}
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@ONLY
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)
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if(JSON_Install)
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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 ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
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)
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install(
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FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
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DESTINATION ${NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR}
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)
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endif()
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