JDK8 Preliminary Repository Layout

[Kelly O'Hair]

On Mar 15, 2011, at 2:27 AM, Steve Poole wrote:

> Primarily then the objective of having multiple repositories is to improve developer productivity and component stability.
> 

And also facilitate the ability to distribute some components to multiple projects outside the jdk or multiple jdks.

> I don't know how much cross-repo changes go on.   It would seem that if that is minimal then the next logical step would be to
> remove the source for the repos you're not working on and just have the binaries instead.    Do you see that as a worthwhile goal?

When doing partial builds, there is a ALT_JDK_IMPORT_PATH (import jdk) setting which is supposed to point to
a jdk built image (one with a bin, lib, include, jre, etc. layout). This should be a very recent jdk7 build
image, and is normally the last promoted jdk build (which changes weekly with each promotion).
That is where previously built components come from, see the jdk/make/java/redist/Makefile for details.

This ALT_JDK_IMPORT_PATH setting has taken on various names over the years, you will also see
ALT_HOTSPOT_* variables in the jdk repository makefiles.

So for partial builds, you need a ALT_BOOTDIR (boot jdk) and also a ALT_JDK_IMPORT_PATH
to get the components that you are not building.

For OpenJDK, once you have a complete forest build, you can save the j2sdk-image directory somewhere,
point ALT_JDK_IMPORT_PATH at that area, and you should be good to go for doing partial builds
in the hotspot or jdk repositories. The langtools, jaxp, jaxws, and corba repositories are fairly standalone
and don't result in a complete built jdk image when built by themselves.

See:
http://blogs.sun.com/kto/entry/anatomy_of_the_jdk_build
http://blogs.sun.com/jjg/entry/building_javac_for_jdk7

-kto
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