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* bug#41669: Cross-compiled powerpc64-linux bootstrap-tarballs not reproducible
@ 2020-06-02 18:59 Chris Marusich
  2020-06-03  9:48 ` Chris Marusich
  0 siblings, 1 reply; 45+ messages in thread
From: Chris Marusich @ 2020-06-02 18:59 UTC (permalink / raw)
  To: 41669

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Hi,

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

https://lists.gnu.org/archive/html/guix-devel/2020-06/msg00003.html

Four people attempted to invoke the following command using Guix commit
8159ce1970d91567468cf1bacac313099a009d2a:

  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:

/gnu/store/pygln3lr6qbxcps3kmn3w4bc0d0nlpd3-gcc-stripped-tarball-5.5.0.drv

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

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

or just

  guix build /gnu/store/pygln3lr6qbxcps3kmn3w4bc0d0nlpd3-gcc-stripped-tarball-5.5.0.drv

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.

-- 
Chris

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^ permalink raw reply	[flat|nested] 45+ messages in thread

end of thread, other threads:[~2021-02-27  2:40 UTC | newest]

Thread overview: 45+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-06-02 18:59 bug#41669: Cross-compiled powerpc64-linux bootstrap-tarballs not reproducible Chris Marusich
2020-06-03  9:48 ` Chris Marusich
2020-06-03 20:50   ` Vincent Legoll
2020-06-10  6:15   ` Chris Marusich
2020-06-10 22:20     ` Bengt Richter
2020-06-11 21:09     ` Jack Hill
2020-09-13  2:53   ` Chris Marusich
2020-09-13  6:28     ` Efraim Flashner
2020-09-26  6:52       ` Chris Marusich
2020-10-05 12:33         ` Ludovic Courtès
2020-12-13 23:36           ` Chris Marusich
2020-12-14  8:17             ` Efraim Flashner
2020-12-14  8:36             ` Ludovic Courtès
2020-12-14  9:22               ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-14 10:27                 ` Efraim Flashner
2020-12-14 10:34                   ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-14 10:38                     ` Efraim Flashner
2020-12-14 10:44                       ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-14 22:24                         ` Ludovic Courtès
2020-12-15  7:34                           ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-15  9:35                             ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-15  7:46                           ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-20  7:28                     ` Chris Marusich
2020-12-28  2:25                       ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-28  4:23                         ` Chris Marusich
2020-12-28  8:07                           ` Efraim Flashner
2020-12-28 12:39                           ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-28 12:55                           ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-28 15:31                             ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-28 17:40                               ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-28 19:01                                 ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-28 20:59                                   ` Leo Le Bouter via Bug reports for GNU Guix
2020-12-29  7:08                                     ` Efraim Flashner
2021-01-05  3:54                           ` Chris Marusich
2020-12-28  8:07                         ` Efraim Flashner
2020-12-30  1:28                       ` Leo Le Bouter via Bug reports for GNU Guix
2021-01-04  9:37                         ` Ludovic Courtès
2021-01-04 11:16                           ` Efraim Flashner
2021-01-05  3:15                           ` Chris Marusich
2021-01-06  8:59                             ` Ludovic Courtès
2021-01-11 10:31                               ` Chris Marusich
2021-01-21  6:26                                 ` Chris Marusich
2021-01-31 21:35                                 ` Ludovic Courtès
2020-10-05 12:47         ` Efraim Flashner
2021-02-27  2:39         ` Chris Marusich

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