fast compiles!

I seem to remember reading something somewhere about monotone's compile times being an 
issue and from what I've seen I would definitely agree. A trivial change to commands.cc 
takes close to a minute to compile on my dual Athlon 2000 which has 3GB of RAM to work with.
I've just installed Andrew Tridgell's ccache package (http://ccache.samba.org/) and it 
makes a *huge* difference.
WITHOUT ccache

$ touch commands.cc
$ time make
make  all-recursive
make[1]: Entering directory `/home/derek/monotone/head'
Making all in po
...
make[2]: Leaving directory `/home/derek/monotone/head'
make[1]: Leaving directory `/home/derek/monotone/head'

real    1m13.906s
user    1m12.626s
sys     0m1.145s

WITH ccache

$ touch commands.cc
$ time make
make  all-recursive
make[1]: Entering directory `/home/derek/monotone/head'
Making all in po
...
make[2]: Leaving directory `/home/derek/monotone/head'
make[1]: Leaving directory `/home/derek/monotone/head'

real    0m3.977s
user    0m3.469s
sys     0m0.376s

That's something like an 18x speedup.

Hope this is helpful!
--
Cheers,
Derek