I have been using this package for a long time.... and find it extremely
better than tags , very simple to use... install idutils (linux)
then cd to sdcc/src (for example) then
> mkid .
to find all references to identifier 'etype'
> gid etype
will list all places where etype is found in the source tree. Very very
for making global changes or finding out where a function is called from etc