With tarballs the latest timestamp of them, with source tree I don't know. :)
I'm only pointing out an interesting, reasonable idea, not asking you to implement it right now. On Wednesday, 25 November 2015, Christos Zoulas <chris...@astron.com> wrote: > In article < > cadbf7ee9mruyyct+97v1bjh_0nh9tqltr-rm5bprgl+knb2...@mail.gmail.com > <javascript:;>>, > Masao Uebayashi <uebay...@gmail.com <javascript:;>> wrote: > >bapt@freebsd taught me that FreeBSD uses ((the newest timestamp in the > >source files) + 1sec) in places where appropriate for reproducible > >build. It might have been about Ports, but idea is it. > > That's a nice way to do it. How do they compute that? > > christos > >