Looks like you are missing some libraries in your project properties. Search the sysroot\usr\lib directory for files containing the undefined symbols from the error message and add the found library names (without ‘lib’ prefix and extension) to the library list in VisualGDB Project Properties.
Regarding real-time IntelliSense, you can try enabling Tools->Options->C/C++(VisualGDB)->Advanced->Code Completion->Suggest names while typing. If this is not what you meant, please provide us with a better example of what you are trying to achieve.