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1cmake_minimum_required(VERSION 3.1)
2
3##
4## PROJECT
5## name and version
6##
7project(nlohmann_json VERSION 3.7.3 LANGUAGES CXX)
8
9##
10## INCLUDE
11##
12##
13include(ExternalProject)
14
15##
16## OPTIONS
17##
18option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON)
19option(JSON_Install "Install CMake targets during install step." ON)
20option(JSON_MultipleHeaders "Use non-amalgamated version of the library." OFF)
21
22##
23## CONFIGURATION
24##
25include(GNUInstallDirs)
26
27set(NLOHMANN_JSON_TARGET_NAME               ${PROJECT_NAME})
28set(NLOHMANN_JSON_CONFIG_INSTALL_DIR        "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" CACHE INTERNAL "")
29set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR       "${CMAKE_INSTALL_INCLUDEDIR}")
30set(NLOHMANN_JSON_TARGETS_EXPORT_NAME       "${PROJECT_NAME}Targets")
31set(NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE     "cmake/config.cmake.in")
32set(NLOHMANN_JSON_CMAKE_CONFIG_DIR          "${CMAKE_CURRENT_BINARY_DIR}")
33set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
34set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
35set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake")
36
37if (JSON_MultipleHeaders)
38    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
39    message(STATUS "Using the multi-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
40else()
41    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/single_include/")
42    message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
43endif()
44
45##
46## TARGET
47## create target and add include path
48##
49add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
50add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_TARGET_NAME})
51if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
52    target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_range_for)
53else()
54    target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11)
55endif()
56
57target_include_directories(
58    ${NLOHMANN_JSON_TARGET_NAME}
59    INTERFACE
60    $<BUILD_INTERFACE:${NLOHMANN_JSON_INCLUDE_BUILD_DIR}>
61    $<INSTALL_INTERFACE:include>
62)
63
64## add debug view definition file for msvc (natvis)
65if (MSVC)
66    set(NLOHMANN_ADD_NATVIS TRUE)
67    set(NLOHMANN_NATVIS_FILE "nlohmann_json.natvis")
68    target_sources(
69        ${NLOHMANN_JSON_TARGET_NAME}
70        INTERFACE
71            $<INSTALL_INTERFACE:${NLOHMANN_NATVIS_FILE}>
72            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${NLOHMANN_NATVIS_FILE}>
73    )
74endif()
75
76##
77## TESTS
78## create and configure the unit test target
79##
80include(CTest) #adds option BUILD_TESTING (default ON)
81
82if(BUILD_TESTING AND JSON_BuildTests)
83    enable_testing()
84    add_subdirectory(test)
85endif()
86
87##
88## INSTALL
89## install header files, generate and install cmake config files for find_package()
90##
91include(CMakePackageConfigHelpers)
92write_basic_package_version_file(
93    ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE} COMPATIBILITY SameMajorVersion
94)
95configure_file(
96    ${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE}
97    ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE}
98    @ONLY
99)
100
101if(JSON_Install)
102    install(
103        DIRECTORY ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}
104        DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
105    )
106    install(
107        FILES ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
108        DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
109    )
110    if (NLOHMANN_ADD_NATVIS)
111        install(
112            FILES ${NLOHMANN_NATVIS_FILE}
113            DESTINATION .
114    )
115    endif()
116    export(
117        TARGETS ${NLOHMANN_JSON_TARGET_NAME}
118        NAMESPACE ${PROJECT_NAME}::
119        FILE ${NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE}
120    )
121    install(
122        TARGETS ${NLOHMANN_JSON_TARGET_NAME}
123        EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
124        INCLUDES DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
125    )
126    install(
127        EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
128        NAMESPACE ${PROJECT_NAME}::
129        DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
130    )
131endif()
132