[poky] ccache

[Chris Larson]

On Tue, Apr 3, 2012 at 10:31 AM, Gary Thomas <gary at mlbassoc.com> wrote:
> Why is ccache being used for Poky/Yocto builds?  My understanding is
> that it's a win for _rebuilds_ of the same/related files, but there's
> not a whole lot of that going on.
>
> If I build core-image-sato from scratch, I end up with ${BUILD}/tmp/ccache
> which is 1.8GB - quite a bite!  Is there some way to disable this?, other
> than not have ccache on my host computer (not an option as it is useful
> for other builds I do)

I think the default behavior of using ccache when it's installed is
extremely bad, and dangerous, in that the ccache object cache is of
both limited usefulness, as you say, and the object cache can get
corrupted, leading to extremely odd behavior (and it's rarely a place
you think to look as a cause). At Mentor we disabled this behavior,
and I really, really think we should do so in the default oe-core
bitbake.conf.
-- 
Christopher Larson