C/C++ front-end extension a la SWIG?

[Laurent Guerby]

> Should be fairly low maintenance, can be used/reused for other
> languages (GNU Fortran/GNU Ada...)

GNU Ada already generates full xref information in simple text files
(that are used by the Emacs Ada mode for navigating, and various msic
tools). 

Also in the Ada case, there is a standard called ASIS that defines an
Ada API to access to all the compiler information about a program, and
GNU Ada provides an implementation called ASIS for GNAT.

I don't know the situation on the GNU Fortran side.

-- 
Laurent Guerby <guerby@acm.org>