Is there a way to generate a cross reference listing for a c/c++ program using gcc?

[Paul Albrecht]

William Beebe writes:

>
>If you want that kind of cross referencing, then you shouild look at
Doxygen (http://www.stack.nl/~dimitri/doxygen/)....
>

I need the cross-reference output from the compiler because I want to write
a source code browser like LXR.  That's why I asked the question.  Again, is
there a way to generate a cross-reference listing for a c/c++ program using
gcc?  If not, the has anyone considered adding a gcc compiler option to
output cross-reference information?