RFR: 8014074: Building hotspot with ccache in new build is very slow with empty cache.

[David Holmes]

Hi Erik,

I have mixed feelings on this one. On the one hand I don't like the idea 
that using/not-using an optimization like ccache, changes the way the 
build of hotspot is carried out. On the other hand, if this means we 
will do more builds without precompiled headers then it should help trap 
errors when there are missing #includes.

Does this have any impact on our actual RE builds?

Thanks,
David

On 24/05/2013 11:22 PM, Erik Joelsson wrote:
> This patch to configure disables precompiled headers in hotspot when
> ccache is in use.
>
> Background is in this mail (and the bug report):
> http://mail.openjdk.java.net/pipermail/build-dev/2013-April/008772.html
>
> In short, build time is shortened considerably both with an empty and a
> perfect cache when ccache is in use.
>
> Note that this only affects full builds from the root repo and not
> hotspot only builds.
>
> http://cr.openjdk.java.net/~erikj/8014074/webrev.root.01/
>
> /Erik