use of TAGS file for spellchecking in C mode

hi hi,

at first thanks for the c comment spell-cheking mode. Its a good start to get 
better source documentation. On annoying thing is that aspell does not know 
about symbol names and thus brings up a lot of false warnings when referencing 
symbol names in doc-comments.
One idea would be to use a local TAGS file as an additional wordlist. 
Unfortunately I neither foudn how to use a local wordlist, nor how such a 
wordlist should look like. Can someone please point me to the right place. Then 
I can write a simple perl-tool to convert the TAGS file into the appropriate 
format for aspell.

Ciao
   Stefan