We need a custom hook in TestImage.gmk to modify behavior when building with custom source.
------------- Commit messages: - JDK-8331939 Changes: https://git.openjdk.org/jdk/pull/19139/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19139&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8331939 Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/19139.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19139/head:pull/19139 PR: https://git.openjdk.org/jdk/pull/19139
