RFR: JDK-8143141: Bring in minor build changes from the jigsaw/jake forest

[Erik Joelsson]

On 2015-11-18 22:20, Mandy Chung wrote:
>> On Nov 17, 2015, at 7:11 AM, Erik Joelsson <erik.joelsson at oracle.com> wrote:
>>
>> Hello,
>>
>> When bringing changes from jdk9 to jigsaw/jake, the merges have become quite involved. The build files in jdk9 and jake have also diverged unnecessarily over time. I would like to bring them back closer to each other so that we are only carrying the changes we really need to in jake.
>>
> Thanks for doing this, Erik.   It’d be good to bring back such changes to jdk9/dev.  They are good cleanup.
>
>> New webrevs, only for top and jdk now. The other repos no longer need changes:
>> http://cr.openjdk.java.net/~erikj/8143141/webrev.top.02/
>> http://cr.openjdk.java.net/~erikj/8143141/webrev.jdk.02/
> I skimmed on it and looks okay.   One question:
>
>   526 JAVAC_FLAGS := -bootclasspath $(EMPTY_DIR) -extdirs \
>   527     $(EMPTY_DIR) -endorseddirs $(EMPTY_DIR) $($(MODULE)_ADD_JAVAC_FLAGS)
>   528
>
> What -target option is used together with these javac flags?  I suppose -target 8 in order to get the boot cycle build work.
This is used with target 9. In jake, we have the "-systemmodulepath 
none" special flag, but to achieve the same(ish) thing in current JDK 9, 
we need to explicitly set all the non application classpaths to nothing.

/Erik