JDK 9 RFR of JDK-8072480: javac should support compilation for a specific platform version

[mark.reinhold at oracle.com]

2015/5/21 12:01 -0700, jan.lahoda at oracle.com:
> This is a patch adding a new option, -platform, to javac.
> 
> Patch for the top-level repository is here:
> http://cr.openjdk.java.net/~jlahoda/8072480/webrev.00/top-level/
> 
> Patch for the langtools repository is here:
> http://cr.openjdk.java.net/~jlahoda/8072480/webrev.00/langtools/
> 
> These changes also require additional langtools changes as their 
> prerequisite:
> http://cr.openjdk.java.net/~jlahoda/8080675/webrev.00/

Nice work -- I'm glad to see this coming in.

What's the rationale for putting the symbol generator and all its data
in the top-level repo?  That'll add quite a bit of heft to a repo that's
always been intended to remain fairly lightweight.  Wouldn't it make
more sense for this code and data to be placed in the langtools repo?
Or is there some sort of build-bootstrapping issue here?

- Mark