RFR: 8275745: Reproducible copyright headers

[Yi Yang]

On Sat, 28 Nov 2020 23:14:35 GMT, Emmanuel Bourg <duke at openjdk.java.net> wrote:

> The copyright headers are generated at build time, and the year inserted in the template depends on the current date. This means the headers are not reproducible if the project is built a year later. The year in the headers could be derived from the SOURCE_DATE_EPOCH environment variable to make the build reproducible (this variable is already used in other parts of the build).

You should link an issue to this patch so that a Request-For-Review email will be sent to the corresponding mailing list. Or they may not notice your patch.

Hi Emmanuel Bourg,

I'm not quite sure whether this PR is useful since I'm not familiar with the make system. I think you can just send an email to build-dev at openjdk.java.net(You may need to subscribe [it](https://mail.openjdk.java.net/mailman/listinfo/build-dev) before), the related folks/experts would review your change or give some meaningful feedbacks if they think it's worth doing it. Good Luck!

Thanks,
Yang

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PR: https://git.openjdk.java.net/jdk/pull/1498