Integrated: 8310384: Add hooks for custom image creation

[Erik Joelsson]

On Tue, 20 Jun 2023 13:34:24 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> We have a need for creating custom variants of the JDK image and would like to be able to reuse the existing Images.gmk for doing so. To be able to do that, we need to define some variables that are suitable for overrides. Specifically, we need:
> 
> EXTRA_MODULES: a list of extra java module names to include in the "jdk" image.
> 
> EXTRA_JMODS_DIR: a list of extra directories to add to the module path and look for jmods in, ahead the default jmods dir.
> 
> JDK_IMAGE_SUPPORT_DIR: override the location of the support dir. Without overriding this, multiple calls to Images.gmk will overwrite each others intermediate files and dependency files.

This pull request has now been integrated.

Changeset: 16a34e8e
Author:    Erik Joelsson <erikj at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/16a34e8e1e603d2cc8f05fcf01376230af441dbd
Stats:     19 lines in 1 file changed: 7 ins; 0 del; 12 mod

8310384: Add hooks for custom image creation

Reviewed-by: mikael, alanb

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PR: https://git.openjdk.org/jdk/pull/14563