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

[Erik Joelsson]

On Wed, 22 Dec 2021 15:44:39 GMT, Andrew Leonard <aleonard at openjdk.org> wrote:

>> If "reproducible build" is enabled, then utilize the new --date option in the building of jar's and jmods.
>> Validating the boot jdk supports --date for the building of the jars.
>> 
>> Signed-off-by: Andrew Leonard <anleonar at redhat.com>
>
> Andrew Leonard has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - 8278766: Enable OpenJDK build support for reproducible jars and jmods using --date
>    
>    Signed-off-by: Andrew Leonard <anleonar at redhat.com>
>  - 8278766: Enable OpenJDK build support for reproducible jars and jmods using --date
>    
>    Signed-off-by: Andrew Leonard <anleonar at redhat.com>
>  - 8278766: Enable OpenJDK build support for reproducible jars and jmods using --date
>    
>    Signed-off-by: Andrew Leonard <anleonar at redhat.com>

make/InitSupport.gmk line 320:

> 318:     else
> 319:       export SOURCE_DATE_ISO_8601 := $$(shell $$(DATE) -u -j -f "%s" "$$(SOURCE_DATE_EPOCH)" +"%Y-%m-%dT%H:%M:%SZ" 2> /dev/null)
> 320:     endif

This is starting to look pretty good, but I would ask you to try to break these long lines. We try to keep the makefiles reasonably narrow for easier future 3-way merges and diff viewing.

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