RFR(13): JDK-8216263: Add historical data for JDK 12

[Joseph D. Darcy]

Hi Jan,

On 1/7/2019 4:48 AM, Jan Lahoda wrote:
> Hi,
>
> To make --release 12 work, we need to add historical data for JDK 12. 
> The current historical data is based on:
> $ javac  -fullversion
> javac full version "12-ea+26"
>
> We may need to update the data once JDK 12 is out to cover any changes 
> to the APIs that might happen.
>
> The patch also adds a simple (shell) script to generate the data, so 
> all that was needed to generate the data was:
> $ cd make/data/symbols
> $ sh generate-data <path-to-JDK-12>
>
> JBS: https://bugs.openjdk.java.net/browse/JDK-8216263
> Webrev: http://cr.openjdk.java.net/~jlahoda/8216263/webrev.00/
>
> How does this look?

If the overhead is small enough and we don't mind a few updates to the 
JDK N+1 data, than perhaps the generation of this information could be 
included as part of the start of JDK N+1 activities.

I suggest a more extensive description of how to 
make/data/symbols/generate-data. For example, this builds the data for 
the current release independent of whether or not the current release 
has already had its data generated, correct?

Concretely, if JDK N+1 has already forked, what is the proper way to get 
data for JDK N? Likewise, how should a re-build of the data for JDK N be 
done?

Thanks,

-Joe