[Reproducible-builds] new default build flag from dpkg: -Wdate-time

[Mattia Rizzolo]

[sorry for the double email, messed up with the r-b list address...]

Hi!

As part of the Reproducible Builds effort [0] we added a
"reproducible/timeless" feature area to dpkg which exports -Wdate-time
via CPPFLAGS [1].

In our CI infrastructure we enabled that in Spring.

We now think this is the right time to enable this flag by default.
From our builds, we can only see 4 packages which fail to build due to
this:
    subversion + unbound
        https://bugs.debian.org/790102
    expeyes
        https://bugs.debian.org/790103
    wsjt
        https://bugs.debian.org/804672


Following [2] we're now bringing this up on debian-devel at l.d.o to learn
about for any known issues we may be not aware of, any concerns, etc.

[0] https://wiki.debian.org/ReproducibleBuilds
    is there any chance you haven't yet heard from us? ;)
    Have you also seen https://reproducible-builds.org ?  If not, go
    see it, it's awesome!
[1] https://bugs.debian.org/762683
[2] https://wiki.debian.org/Teams/Dpkg/FAQ#Q:_Can_we_add_support_for_new_default_build_flags_to_dpkg-buildflags.3F


-- 
regards,
                        Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18  4D18 4B04 3FCD B944 4540      .''`.
more about me:  http://mapreri.org                              : :'  :
Launchpad user: https://launchpad.net/~mapreri                  `. `'`
Debian QA page: https://qa.debian.org/developer.php?login=mattia  `-
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