On Sat, 28 Nov 2020 23:14:35 GMT, Emmanuel Bourg <d...@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).

Yes, that's what I'm thinking. `--with-copyright-year` should have priority 
over `SOURCE_DATE_EPOCH` -- the latter is kind of a fallback; if you actively 
set another value on the command line it should override environment variables. 
(As is generally the case.)

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

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