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Andrej730
44 lines
1.9 KiB
CMake
44 lines
1.9 KiB
CMake
#
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# Input variables:
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# - `JSON_INCLUDE_DIR`
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# If input variables are not specified, try to find nlohmann_json config.
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# Input variables could also be provided as environment variables.
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#
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# Output targets:
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# - `nlohmann_json::nlohmann_json`
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UNIFY_ENVVARS_AND_CACHE(JSON_INCLUDE_DIR)
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if(NOT JSON_INCLUDE_DIR)
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find_package(nlohmann_json ${nlohmann_json_FIND_VERSION} CONFIG)
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mark_as_advanced(nlohmann_json)
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if(nlohmann_json_DIR)
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return()
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endif()
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endif()
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find_path(json_header_path "nlohmann/json.hpp" HINTS "${JSON_INCLUDE_DIR}")
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mark_as_advanced(json_header_path)
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if(json_header_path)
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file(STRINGS "${json_header_path}/nlohmann/json.hpp" json_version_major_line REGEX "^#define NLOHMANN_JSON_VERSION_MAJOR")
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file(STRINGS "${json_header_path}/nlohmann/json.hpp" json_version_minor_line REGEX "^#define NLOHMANN_JSON_VERSION_MINOR")
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file(STRINGS "${json_header_path}/nlohmann/json.hpp" json_version_patch_line REGEX "^#define NLOHMANN_JSON_VERSION_PATCH")
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string(REGEX REPLACE "^#define NLOHMANN_JSON_VERSION_MAJOR ([0-9]+)$" "\\1" json_version_major "${json_version_major_line}")
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string(REGEX REPLACE "^#define NLOHMANN_JSON_VERSION_MINOR ([0-9]+)$" "\\1" json_version_minor "${json_version_minor_line}")
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string(REGEX REPLACE "^#define NLOHMANN_JSON_VERSION_PATCH ([0-9]+)$" "\\1" json_version_patch "${json_version_patch_line}")
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set(nlohmann_json_VERSION "${json_version_major}.${json_version_minor}.${json_version_patch}")
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(nlohmann_json
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REQUIRED_VARS json_header_path
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VERSION_VAR nlohmann_json_VERSION
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)
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add_library(nlohmann_json::nlohmann_json INTERFACE IMPORTED)
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target_include_directories(nlohmann_json::nlohmann_json INTERFACE ${json_header_path})
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return()
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endif()
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message(FATAL_ERROR "Unable to find JSON for Modern C++ header file / package, aborting")
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