Linux下C++使用json库解析库源码以及相关编译

IF( CMAKE_COMPILER_IS_GNUCXX ) #Get compiler version. EXECUTE_PROCESS( COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GNUCXX_VERSION ) #-Werror=* was introduced -after- GCC 4.1.2 IF( GNUCXX_VERSION VERSION_GREATER 4.1.2 ) SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=strict-aliasing") ENDIF() ENDIF( CMAKE_COMPILER_IS_GNUCXX ) INCLUDE(CheckIncludeFileCXX) INCLUDE(CheckTypeSize) INCLUDE(CheckStructHasMember) INCLUDE(CheckCXXSymbolExists) check_include_file_cxx(clocale HAVE_CLOCALE) check_cxx_symbol_exists(localeconv clocale HAVE_LOCALECONV) IF(CMAKE_VERSION VERSION_LESS 3.0.0) # The "LANGUAGE CXX" parameter is not supported in CMake versions below 3, # so the C compiler and header has to be used. check_include_file(locale.h HAVE_LOCALE_H) SET(CMAKE_EXTRA_INCLUDE_FILES locale.h) check_type_size("struct lconv" LCONV_SIZE) UNSET(CMAKE_EXTRA_INCLUDE_FILES) check_struct_has_member("struct lconv" decimal_point locale.h HAVE_DECIMAL_POINT) ELSE() SET(CMAKE_EXTRA_INCLUDE_FILES clocale) check_type_size(lconv LCONV_SIZE LANGUAGE CXX) UNSET(CMAKE_EXTRA_INCLUDE_FILES) check_struct_has_member(lconv decimal_point clocale HAVE_DECIMAL_POINT LANGUAGE CXX) ENDIF() IF(NOT (HAVE_CLOCALE AND HAVE_LCONV_SIZE AND HAVE_DECIMAL_POINT AND HAVE_LOCALECONV)) MESSAGE(WARNING "Locale functionality is not supported") ADD_DEFINITIONS(-DJSONCPP_NO_LOCALE_SUPPORT) ENDIF() SET( JSONCPP_INCLUDE_DIR ../../include ) SET( PUBLIC_HEADERS ${JSONCPP_INCLUDE_DIR}/json/config.h ${JSONCPP_INCLUDE_DIR}/json/forwards.h ${JSONCPP_INCLUDE_DIR}/json/features.h ${JSONCPP_INCLUDE_DIR}/json/value.h ${JSONCPP_INCLUDE_DIR}/json/reader.h ${JSONCPP_INCLUDE_DIR}/json/writer.h ${JSONCPP_INCLUDE_DIR}/json/assertions.h ${JSONCPP_INCLUDE_DIR}/json/version.h ) SOURCE_GROUP( "Public API" FILES ${PUBLIC_HEADERS} ) SET(jsoncpp_sources json_tool.h json_reader.cpp json_valueiterator.inl json_value.cpp json_writer.cpp version.h.in) # Install instructions for this target IF(JSONCPP_WITH_CMAKE_PACKAGE) SET(INSTALL_EXPORT EXPORT jsoncpp) ELSE(JSONCPP_WITH_CMAKE_PACKAGE) SET(INSTALL_EXPORT) ENDIF() IF(BUILD_SHARED_LIBS) ADD_DEFINITIONS( -DJSON_DLL_BUILD ) ADD_LIBRARY(jsoncpp_lib SHARED ${PUBLIC_HEADERS} ${jsoncpp_sources}) SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES VERSION ${JSONCPP_VERSION} SOVERSION ${JSONCPP_SOVERSION}) SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES OUTPUT_NAME jsoncpp DEBUG_OUTPUT_NAME jsoncpp${DEBUG_LIBNAME_SUFFIX} ) # Set library's runtime search path on OSX IF(APPLE) SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES INSTALL_RPATH "@loader_path/." ) ENDIF() INSTALL( TARGETS jsoncpp_lib ${INSTALL_EXPORT} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}) IF(NOT CMAKE_VERSION VERSION_LESS 2.8.11) TARGET_INCLUDE_DIRECTORIES( jsoncpp_lib PUBLIC $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}> $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/${JSONCPP_INCLUDE_DIR}>) ENDIF() ENDIF() IF(BUILD_STATIC_LIBS) ADD_LIBRARY(jsoncpp_lib_static STATIC ${PUBLIC_HEADERS} ${jsoncpp_sources}) SET_TARGET_PROPERTIES( jsoncpp_lib_static PROPERTIES VERSION ${JSONCPP_VERSION} SOVERSION ${JSONCPP_SOVERSION}) # avoid name clashes on windows as the shared import lib is also named jsoncpp.lib if (NOT DEFINED STATIC_SUFFIX AND BUILD_SHARED_LIBS) set (STATIC_SUFFIX "_static") endif () set_target_properties (jsoncpp_lib_static PROPERTIES OUTPUT_NAME jsoncpp${STATIC_SUFFIX} DEBUG_OUTPUT_NAME jsoncpp${STATIC_SUFFIX}${DEBUG_LIBNAME_SUFFIX}) INSTALL( TARGETS jsoncpp_lib_static ${INSTALL_EXPORT} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}) IF(NOT CMAKE_VERSION VERSION_LESS 2.8.11) TARGET_INCLUDE_DIRECTORIES( jsoncpp_lib_static PUBLIC $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}> $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/${JSONCPP_INCLUDE_DIR}> ) ENDIF() ENDIF()