RFR: 8278766: Enable OpenJDK build support for reproducible jars and jmods using --date [v4]

[Andrew Leonard]

On Fri, 17 Dec 2021 20:08:43 GMT, Andrew Leonard <aleonard at openjdk.org> wrote:

>> But I think the code in InitSupport will be executed always; Init.gmk is our "bootstrapper" / "trampoline" which wraps all calls to make (and InitSupport.gmk contains gory implementation details of Init.gmk).
>
> @magicus don't worry, enjoy your holiday, I think @erik has pointed out it should work, so I probably made a mistake when I tried it...

Moved export SOURCE_DATE_ISO_8601 to InitSupport as suggested, found the problem as to why it didn't work for me, I was missing a "$" !

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PR: https://git.openjdk.java.net/jdk/pull/6878