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include(ExternalProject)
if (${CMAKE_SYSTEM_NAME} STREQUAL "Emscripten")
set(JSONCPP_CMAKE_COMMAND emcmake cmake)
else()
set(JSONCPP_CMAKE_COMMAND ${CMAKE_COMMAND})
endif()
set(prefix "${CMAKE_BINARY_DIR}/deps")
set(JSONCPP_LIBRARY "${prefix}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}jsoncpp${CMAKE_STATIC_LIBRARY_SUFFIX}")
set(JSONCPP_INCLUDE_DIR "${prefix}/include")
if(NOT MSVC)
set(JSONCPP_EXTRA_FLAGS "-std=c++11")
endif()
set(byproducts "")
if(CMAKE_VERSION VERSION_GREATER 3.1)
set(byproducts BUILD_BYPRODUCTS "${JSONCPP_LIBRARY}")
endif()
ExternalProject_Add(jsoncpp-project
PREFIX "${prefix}"
DOWNLOAD_DIR "${CMAKE_SOURCE_DIR}/deps/downloads"
DOWNLOAD_NAME jsoncpp-1.8.4.tar.gz
URL https://github.com/open-source-parsers/jsoncpp/archive/1.8.4.tar.gz
URL_HASH SHA256=c49deac9e0933bcb7044f08516861a2d560988540b23de2ac1ad443b219afdb6
CMAKE_COMMAND ${JSONCPP_CMAKE_COMMAND}
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-DCMAKE_INSTALL_LIBDIR=lib
# Build static lib but suitable to be included in a shared lib.
-DCMAKE_POSITION_INDEPENDENT_CODE=${BUILD_SHARED_LIBS}
-DJSONCPP_WITH_TESTS=OFF
-DJSONCPP_WITH_PKGCONFIG_SUPPORT=OFF
-DCMAKE_CXX_FLAGS=${JSONCPP_EXTRA_FLAGS}
-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
${byproducts}
)
# Create jsoncpp imported library
add_library(jsoncpp STATIC IMPORTED)
file(MAKE_DIRECTORY ${JSONCPP_INCLUDE_DIR}) # Must exist.
set_property(TARGET jsoncpp PROPERTY IMPORTED_LOCATION ${JSONCPP_LIBRARY})
set_property(TARGET jsoncpp PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${JSONCPP_INCLUDE_DIR})
add_dependencies(jsoncpp jsoncpp-project)
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