e8b6b7adc1
Commit 73cc5089 (Using target_compile_features to specify C++ 11
standard) bumped the required cmake version, from 3.0 to 3.8, so
as to get the definition of target_compile_features().
However, target_compile_features() was introduced in cmake-3.1:
https://cmake.org/cmake/help/v3.1/command/target_compile_features.html
And using cmake-3.1 is indeed sufficient to properly build.
As such, relax the minimum required version down to cmake-3.1,
so we can build on oldish, entreprise-grade distributions that
only have cmake-3.1 (or at least, don't have up to cmake-3.8).
Reported-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
123 lines
3.6 KiB
CMake
123 lines
3.6 KiB
CMake
cmake_minimum_required(VERSION 3.1)
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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 3.5.0 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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${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE} COMPATIBILITY SameMajorVersion
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)
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configure_file(
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${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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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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