Boot cycle builds

[Kelly O'Hair]

Brad Wetmore wrote:
>> As soon as we can do a jdk7 boot cycle build again, I plan on changing
>> the default build to include a boot cycle build
>> (where the jdk7 image is built, then used as the boot jdk to build
>> it again).
> 
> Kelly, is this just when doing full "control"/top-level builds?  Not
> when building just the JDK repository?

Correct.

> 
>> It can be turned off with SKIP_BOOT_CYCLE=true, but I hope the
>> integrators and everyone will be careful when it is turned off.
> 
> Looks like this is already in?  (./Makefile)

Feature is there, but the default setting is true (skips it).

-kto

> 
>> Depending on your build situation, this could add 20-30 minutes
>> (maybe more) to your jdk7 build, which is painful I know, but
>> so is finding out that the jdk you just built doesn't work.
> 
> If not, I'll need to adjust my security builds accordingly.
> 
> Brad
>