RFR: JDK-8170280: Enable -g for all java compilation in the build

[Erik Joelsson]

It was pointed out that the changes to Images.gmk could be made simpler. 
Here is a new webrev:

http://cr.openjdk.java.net/~erikj/8170280/webrev.top.02

/Erik


On 2016-11-23 15:25, Erik Joelsson wrote:
> For a long time, a lot of people have been wanting the JDK classes to 
> be compiled with debug symbols enabled by default. I believe the 
> reason we haven't so far is to keep footprint down for the JRE image. 
> The usecase for debug information is mainly in the JDK image, which is 
> used for development. The problem so far has then been that we don't 
> want to compile everything twice, once with and once without debug 
> symbols.
>
> With jlink, we now have the option of stripping debug information at 
> link time. This adds a bit of time creating the images, but it's small 
> compared to recompiling all classes. Because of this, I propose that 
> we enable debug symbols for all java compilation in the build by 
> default and add stripping to all images that are footprint sensitive.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8170280
>
> Webrev: http://cr.openjdk.java.net/~erikj/8170280/webrev.top.01
>
> /Erik
>