RFR: 8296754: AutoCreateSharedArchive in JDK 20 is not compatible with JDK 19 [v7]

[Ioi Lam]

On Tue, 22 Nov 2022 19:21:51 GMT, Matias Saavedra Silva <matsaave at openjdk.org> wrote:

>> The -XX:+AutoCreateSharedArchive flag was implemented in JDK 19, however, this flag doesn't work across JDK 19 and 20.
>> 
>> Expected: JDK 20 should recreate the specified CDS archive
>> Actual: JDK 20 cannot recognize the archive file and gives up
>> 
>> The new field from GenericCDSFileMapHeader is now in FileMapHeader. Verified with tier 1-4 tests.
>
> Matias Saavedra Silva has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:
> 
>  - Merge branch 'master' into autoCreateSharedArchive_8296754
>  - Added newline to end of test
>  - Removed unused import
>  - Test now passes
>  - Changed whitespace and comment
>  - Adjusted whitespace
>  - Added test
>  - 8296754: AutoCreateSharedArchive in JDK 20 is not compatible with JDK 19

Approved latest changes again. Matias had to do second force-push which reverted the effects of the first force-push.

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11148