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nlohmannjson/CMakeLists.txt

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CMake
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cmake_minimum_required(VERSION 3.1)
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##
## PROJECT
## name and version
##
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project(nlohmann_json VERSION 3.8.0 LANGUAGES CXX)
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##
## INCLUDE
##
##
include(ExternalProject)
##
## OPTIONS
##
option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON)
option(JSON_Install "Install CMake targets during install step." ON)
option(JSON_MultipleHeaders "Use non-amalgamated version of the library." OFF)
##
## CONFIGURATION
##
include(GNUInstallDirs)
set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
set(NLOHMANN_JSON_CONFIG_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" CACHE INTERNAL "")
set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}")
set(NLOHMANN_JSON_TARGETS_EXPORT_NAME "${PROJECT_NAME}Targets")
set(NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE "cmake/config.cmake.in")
set(NLOHMANN_JSON_CMAKE_CONFIG_DIR "${CMAKE_CURRENT_BINARY_DIR}")
set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake")
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if (JSON_MultipleHeaders)
set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
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message(STATUS "Using the multi-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
else()
set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/single_include/")
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message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
endif()
##
## TARGET
## create target and add include path
##
add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
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")
target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_range_for)
else()
target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11)
endif()
target_include_directories(
${NLOHMANN_JSON_TARGET_NAME}
INTERFACE
$<BUILD_INTERFACE:${NLOHMANN_JSON_INCLUDE_BUILD_DIR}>
$<INSTALL_INTERFACE:include>
)
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## add debug view definition file for msvc (natvis)
if (MSVC)
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set(NLOHMANN_ADD_NATVIS TRUE)
set(NLOHMANN_NATVIS_FILE "nlohmann_json.natvis")
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target_sources(
${NLOHMANN_JSON_TARGET_NAME}
INTERFACE
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$<INSTALL_INTERFACE:${NLOHMANN_NATVIS_FILE}>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${NLOHMANN_NATVIS_FILE}>
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)
endif()
##
## TESTS
## create and configure the unit test target
##
include(CTest) #adds option BUILD_TESTING (default ON)
if(BUILD_TESTING AND JSON_BuildTests)
enable_testing()
add_subdirectory(test)
endif()
##
## INSTALL
## install header files, generate and install cmake config files for find_package()
##
include(CMakePackageConfigHelpers)
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# use a custom package version config file instead of
# write_basic_package_version_file to ensure that it's architecture-independent
# https://github.com/nlohmann/json/issues/1697
configure_file(
"cmake/nlohmann_jsonConfigVersion.cmake.in"
${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
@ONLY
)
configure_file(
${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE}
${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE}
@ONLY
)
if(JSON_Install)
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install(
DIRECTORY ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}
DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
)
install(
FILES ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
)
if (NLOHMANN_ADD_NATVIS)
install(
FILES ${NLOHMANN_NATVIS_FILE}
DESTINATION .
)
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endif()
export(
TARGETS ${NLOHMANN_JSON_TARGET_NAME}
NAMESPACE ${PROJECT_NAME}::
FILE ${NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE}
)
install(
TARGETS ${NLOHMANN_JSON_TARGET_NAME}
EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
INCLUDES DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
)
install(
EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
NAMESPACE ${PROJECT_NAME}::
DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
)
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endif()