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

[Magnus Ihse Bursie]

On Fri, 17 Dec 2021 16:27:39 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> @magicus I looked at that, but the problem is SOURCE_DATE_EPOCH is set in InitSupport.gmk depending on whether SOURCE_DATE=="updated" : https://github.com/openjdk/jdk/blob/739769c8fc4b496f08a92225a12d07414537b6c0/make/InitSupport.gmk#L315
>> I also couldn't add it in InitSupport.gmk because that marco is not included from every place SetupJarArchive is resolved.
>> Thoughts?
>
> Oh, that's ... interesting. (I'm pretty sure I wrote that code myself :))
> 
> I still think it would be good to keep the new code close to the old. If we set SOURCE_DATE to "updated", I think that should reflect in SOURCE_DATE_ISO_8601 as well. Maybe it does by the current design, but if it does, it could be more obvious.
> 
> I'm sorry I don't have any ready-made suggestion. :( I'm really on vacation now and can't really dive into this, so if you can't find any better solution, then this'll have to do.

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).

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