automatic dependency tracking

[Tom Lord]

Is there anything known to be non-portable about this technique for
generating a list of all included files?


        cc [-I options] -E <source-file> \
        | sed -e '{
                    /^#[[:space:]]\{1,\}[[:digit:]]\{1,\}[[:space:]]\{1,\}"/!d
                    s/^[^"]*"//
                    s/"[^"]*$//
                  }'
        | sort -u


I noticed that depcomp uses something similar for some compilers, but
not others.

-t