minetest/cmake/Modules/FindJson.cmake

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# Look for JSONCPP if asked to.
# We use a bundled version by default because some distros ship versions of
# JSONCPP that cause segfaults and other memory errors when we link with them.
# See https://github.com/minetest/minetest/issues/1793
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mark_as_advanced(JSON_LIBRARY JSON_INCLUDE_DIR)
option(ENABLE_SYSTEM_JSONCPP "Enable using a system-wide JSONCPP. May cause segfaults and other memory errors!" FALSE)
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if(ENABLE_SYSTEM_JSONCPP)
find_library(JSON_LIBRARY NAMES jsoncpp)
find_path(JSON_INCLUDE_DIR json/allocator.h PATH_SUFFIXES jsoncpp)
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include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Json DEFAULT_MSG JSON_LIBRARY JSON_INCLUDE_DIR)
if(JSON_FOUND)
message(STATUS "Using system JSONCPP library.")
endif()
endif()
if(NOT JSON_FOUND)
message(STATUS "Using bundled JSONCPP library.")
set(JSON_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/jsoncpp)
set(JSON_LIBRARY jsoncpp)
add_subdirectory(lib/jsoncpp)
endif()