Aekold Helbrass said the following on 06/25/11 19:37:
Sorry if this is wrong mailing list to ask that question, but it's the only one that looks suitable by its description...
It's really a hotspot question so I've cc'ed that list.
README file tells "64-bit client builds are not directly supported". So: 1) What is the reason of this? Does it mean that client vm source code was not adapted to 64-bit systems or just that Sun/Oracle don't want to provide technical support for this?
We don't build it nor test it on a regular basis internally. The code was originally developed for a proprietary product - Sun Java Real-Time System - and was then added to OpenJDK. We don't officially support it.
2) How badly unsupported it it? Will it work fine but possibly will have some bugs, will it work fine but not as efficient as 32-bit client, or it will hardly work at all?
I don't know where it stands regarding support for latest Java 7 features, but otherwise it should work ok. No idea how to compare performance against 32-bit client.
Build it and see is all I can advise. The Makefiles will need some tweaking to allow this when doing a full JDK build. Otherwise I think you can just do:
cd hotspot/make make LP64=1 product1 David Holmes
