GNU bug report logs - #20272
Support reproducible builds

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From: Andreas Rammhold <andi <at> notmuch.email>
To: 20272 <at> debbugs.gnu.org
Subject: bug#20272: Support reproducible builds
Date: Tue, 2 Jun 2020 14:25:24 +0200

I've just stumpled upon this as within Nixpkgs we have a pending [PR]
that references this issue. Since it reads as if it should be solved in
Guile 2.1+ but still occurs for us in nixpkgs when using parallel builds
(aka using multiple cores in a single build) I thought it might be a
good to get in touch.

Updating our expression to Guile 3.0.2 did not fix the reproducibility
issues either (when built using multiple cores).

I've just now tried a Guix 1.1.0 QEMU image and invoked `guix build
--round=2 -K guile --check -c 8` and it also wasn't reproducible. A
bunch of .go files showed differences between the builds.

Am I missings something?

Would gladly help if there is something I can do.

[PR]: https://github.com/NixOS/nixpkgs/pull/78778

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