ppc-aix-port initial checkin

[Volker Simonis]

Hi gentleman,

as attentive readers of this list may have noticed, we've pushed today
initial changesets to our ppc-aix-port forest which make it possible
to build a full (although non-functional) JDK on Linux/PPC64.

We've tried (and we will try in the future) to be as non-intrusive as
possible with regards to shared code and other existing platforms in
order to simplify an eventual merge of our port into the main line.
The current version is not very exciting by itself (after all, it
doesn't run:) but it will serve as a foundation for the implementation
of the C++-Interpreter in the next weeks and month. We also plan to
push another changeset soon, which will enable  the same, stubbed-out
interpreter build of the HotSpot on AIX such that our colleges can
start with the class library build on AIX.

Some basic build instructions are in the new README-ppc.html file
(http://hg.openjdk.java.net/ppc-aix-port/jdk7u/raw-file/tip/README-ppc.html).
As we move forward we expect to add more information to this file.
Most of the currently needed extra build variables (like
HOTSPOT_TARGET=all_debugcore CC_INTERP=true OPENJDK=true
CORE_BUILD=true) are necessary because of the HotSpot build which
currently only supports a "CORE" (i.e. interpreter only) version.
Others like the settings for RMIC and IDLJ  are necessary because we
use another than the original Oracle JDK for bootstrapping.

Build logs of the initial version on Linux/PPC64 have been made available here:

http://cr.openjdk.java.net/~simonis/ppc-aix-port/build-logs/

And there's one more peculiarity: in order to build the complete JDK,
we had to transplant "7177701: error: Filling jar message during
javax/imageio/metadata/IIOMetadataFormatImpl compilation" from
"jdk8/tl/langtools" to work around
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7177701. This may
lead to a duplicate bug ID in the langtools repository in the future
if we push from 7u-dev. On the other hand we don't expect to do many
changes in the langtools repository at all, so we may just overwrite
our langtools repository with the one from 7u-dev once it contains
this change.

Please feel free to comment or report any problems to the mailing list.

Regards,
Volker