On 2022-11-19, Paul Wise wrote: > On Fri, 18 Nov 2022 10:44:29 -0800 Vagrant Cascadian wrote: > >> - "Built at" << BUILD_TIMESTAMP << "on" << CMAKE_HOST_SYSTEM << >> "for" << CMAKE_SYSTEM << "with" << >> + "Built at" << BUILD_TIMESTAMP << > > Wouldn't it be better to just remove this line entirely, since with > reproducible builds, the "build timestamp" will always be the same, > so isn't really a build timestamp but a source code change timestamp?
That is a reasonable argument! There are no timestamps quite like no timestamps... definitely preferred for reproducible builds to remove the timestamps entirely if possible! For a debian package, the version of the installed package is usually known, so the packaging changelog, https://buildd.debian.org, .buildinfo file, etc. can be used to get various relevent timestamps. That said, I do not know exactly how this is used in the code, so making it empty or non-existent would require further verification, and at least it seems to respect SOURCE_DATE_EPOCH for the moment for a deterministic timestamp. live well, vagrant
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