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bug#41669: Cross-compiled powerpc64-linux bootstrap-tarballs not reprodu

From: Chris Marusich
Subject: bug#41669: Cross-compiled powerpc64-linux bootstrap-tarballs not reproducible
Date: Tue, 02 Jun 2020 11:59:03 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)


As demonstrated in the following email thread, the powerpc64-linux
bootstrap-tarballs are not reproducible when cross-compiled from an
x86_64-linux system:


Four people attempted to invoke the following command using Guix commit

  guix build --no-substitutes --target=powerpc64-linux-gnu bootstrap-tarballs

All of the bootstrap tarballs except for gcc-stripped were reproducible.
However, these attempts produced four different versions of
gcc-stripped-5.5.0-powerpc64-linux-gnu.tar.xz.  At least two of the
attempts were performed on two different x86_64-linux systems.

The derivation that produced the differing output was:


You can build this derivation in a variety of ways, for example:

  guix build --target=powerpc64-linux-gnu -e '(@ (gnu packages make-bootstrap) 

or just

  guix build 

On my x86_64-linux system, twice I tried running "guix build --check" on
this derivation, but each time it surprisingly reported no difference.
Out of paranoia, I tried deleting its output with "guix gc --delete",
and then building it again.  The new output was, indeed, identical to
the old output.  This makes me think that the non-reproducibility is
coming from something outside the immediate build logic of the
gcc-stripped-tarball-5.5.0.drv derivation itself.

I will next try to rebuild everything from scratch again.  I will also
try to get copies of the differing outputs from the people involved in
that email thread, in order to run diffoscope on them.


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