TAGS in clisp d-mode.el

[Compro P. <com...@gm...>]

I use GNU global for C/C++ source files which I was using till now for
the clisp sources too but I find everything a bit over complicated in
the source files with the *.c and *.h . I always have to go back to
*.d to refer to the actual definitions. But when I load the clisp
specific d-mode.el for the purpose I see that GNU global doesn't work
for it. Is it GNU global or d-mode.el itself?
If none then what is your config to get through the process?
I saw https://sourceforge.net/p/clisp/mailman/message/13043278/ where
Sam is saying about dropping comment5 and *.d which is from 2003. Why
they haven't been dropped yet?