# directive description

[Karl Berry]

Ah, the description of "#" is in a different node:
http://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html

The possibly-relevant thing for our purposes is the handling of special
chars in filenames with "octal escape sequences".  I didn't experiment to
see exactly what is done; hopefully just that \nnn means that octal
byte.  Can you check on all that?

Thanks,
k