There are still a couple of C-compiled parts. For more example our embedded copies of libgdl and libcroco as well as widgets that were copied from gimp. In those cases, I guess it's still safer to use extern declarations.
The first answer here describes the use of extern "C" quite well:
http://stackoverflow.com/questions/1041866/in-c-source-what-is-the-effect-of
-extern-c
It is used to prevent name mangling so you can link together e. g. c object
files and c++ object files. I think in Inkscape it isn't necessary at all as
the c++ compiler is used for all the compiling.
Markus
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