On Wed, 2 Mar 2022 16:52:12 GMT, Magnus Ihse Bursie <i...@openjdk.org> wrote:
> When doing reproducible builds, controlling the build time is imperative. To > make this as easy as possible, some changes are needed in the build system. > > * If source-date is set to anything other than "updated" (meaning that it > should be determined at build time), then the default value of > --with-hotspot-build-time should be the same time. > > * If the industry standard SOURCE_DATE_EPOCH is set when running configure, > the default value for --with-source-date should be picked up from this > variable. (If the command line option is given, it will override the > environment variable however.) > > * Finally the code can be made a bit clearer that we can set and export > SOURCE_DATE_EPOCH to SOURCE_DATE in spec.gmk, unless we're using the > "updated" (determined at build time) value. To clarify, the end effect of these changes is that building OpenJDK will basically be compliant with the method of just setting SOURCE_DATE_EPOCH. (The caveat is that it must be set at configure time, not build time.) So $ export SOURCE_DATE_EPOCH=123 $ bash configure $ make will cause the build to default to building in reproducible mode, with the date given by SOURCE_DATE_EPOCH. ------------- PR: https://git.openjdk.java.net/jdk/pull/7660
