There is one open-source c++ parser, the c++ front-end to gcc, which is currently able to deal with the language in its entirety. the purpose of the gcc-xml extension is to generate an xml description of a c++ program from gcc's internal representation. since xml is easy to parse, other development tools will be able to work with c++ programs without the burden of a complicated c++ parser.

these libraries are part of the gcc-xml tool.