debian-legal has concluded that in its current form the GNU FDL is *never*
If several clauses were fixed, it might become free when no Invariant
Sections were used, but so far the FSF has shown no inclination to fix any of
these clauses in a timely manner.
Accordingly, it is time to remove all FDL-covered material from the GCC
source and binary packages. This isn't hard, since it amounts to killing off
everything in the 'info' targets.
Debian-legal is currently working on a concise page explaining why the GNU
FDL is non-free, but until then you can point complainers to the archives of
debian-legal (little else has been discussed for the last year), and to my
Free replacement man pages and other documentation are a work currently in
progress. I hope to have a site together to coordinate this work sometime