[Libreoffice] ccache support

[Lubos Lunak]

On Saturday 10 of September 2011, Norbert Thiebaud wrote:
> On Fri, Sep 9, 2011 at 1:22 PM, Lubos Lunak <l.lunak at suse.cz> wrote:
> >  Since there (AFAIR) haven't been any actual data presented in the
> > discussion
>
> here are some number for my linux buildbot.

 Ccache hit statistics from a buildbot is probably the least realistic example 
possible. Of course the hit ratio is almost 100% when it repeatedly rebuilds 
almost the same source. For normal development builds the hit ratio should be 
much much lower, for many reasons (building noticeably less often and 
building when something does change being the primary two). I consider even 
my 40% hit ratio to be unusually high.

 The only useful numbers I can see is the ~5% ccache overhead, which should 
mean here the break even ratio is <10%, which I guess should be doable for 
LO, but without any real numbers this is still just guesswork.

> Note: when icecream is enable configure.in does _not_ auto-enable
> ccache (iow if you want ccache _with_ icecream you need to actively
> say --enable-ccahe or set up up transparently on your environment

 I have manual setup for either/both icecream and cccache, if this was 
directed at me.

-- 
 Lubos Lunak
 l.lunak at suse.cz