[Reproducible-builds] Bug#823961: herbstluftwm: please make the build reproducible (timestamps)

[Fabian Wolff]

Source: herbstluftwm
Version: 0.7.0-1
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that herbstluftwm could not be built reproducibly.

The attached patch attempts to make the build reproducible by
referring to the SOURCE_DATE_EPOCH environment variable [2] for
deterministic timestamps instead of using the current system time.
However, a fallback is also provided in case SOURCE_DATE_EPOCH is not
set.

Regards,
Fabian Wolff

[1] https://wiki.debian.org/ReproducibleBuilds
[2] https://reproducible-builds.org/specs/source-date-epoch/
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