HOW IT WORKS
        The basic idea is to detect when you are compiling exactly the
same code a 2nd time and use the pre-
        viously compiled output. You detect that it is the same code by
forming a hash of:

        o      the pre-processor output from running the compiler with -E

        o      the command line options

        o      the real compilers size and modification time

        o      any stderr output generated by the compiler

        These  are  hashed  using  md4 (a strong hash) and a cache file
is formed based on that hash result.
        When the same compilation is done a second time ccache is able
to supply the correct compiler output
        (including all warnings etc) from the cache.

So you get really fast recompiles *except* for classes/*.c. What I'd
like to have is (based on ccache's philosophy) a cache for
classes/*.dump and classes/*.c files. Currently they are recreated
permanently.

NB Fink created wrong permissions for ~/.ccache/*

A:

   $ sudo chown -R user:user ~/.ccache

fixed it (if your login and group name is user ;)

leo