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") # TODO: Investigate why this breaks some emscripten builds and # check whether this can be removed after updating the emscripten # versions used in the CI runs. if(EMSCRIPTEN) # Do not include all flags in CMAKE_CXX_FLAGS for emscripten, # but only use -std=c++17. Using all flags causes build failures # at the moment. set(JSONCPP_CXX_FLAGS -std=c++17) else() # jsoncpp uses implicit casts for comparing integer and # floating point numbers. This causes clang-10 (used by ossfuzz builder) # to error on the implicit conversions. Here, we request jsoncpp # to unconditionally use static casts for these conversions by defining the # JSON_USE_INT64_DOUBLE_CONVERSION preprocessor macro. Doing so, # not only gets rid of the implicit conversion error that clang-10 produces # but also forces safer behavior in general. set(JSONCPP_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DJSON_USE_INT64_DOUBLE_CONVERSION") endif() set(byproducts "") if(CMAKE_VERSION VERSION_GREATER 3.1) set(byproducts BUILD_BYPRODUCTS "${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 ${JSONCPP_CMAKE_COMMAND} CMAKE_ARGS -DCMAKE_INSTALL_PREFIX= -DCMAKE_CXX_COMPILER=${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_CXX_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_SYSTEM_INCLUDE_DIRECTORIES ${JSONCPP_INCLUDE_DIR}) set_property(TARGET jsoncpp PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${JSONCPP_INCLUDE_DIR}) add_dependencies(jsoncpp jsoncpp-project)