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bug#21803: Guitarix builds non-deterministically

From: Ludovic Courtès
Subject: bug#21803: Guitarix builds non-deterministically
Date: Sun, 01 Nov 2015 11:30:39 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Guitarix 0.33.0, as of Guix commit 3c3e697, builds

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix challenge guitarix
updating list of substitutes from 'http://hydra.gnu.org'... 100.0%
/gnu/store/6ksnwcqn92z2nf6qw5js7njnfqlifgpb-guitarix-0.33.0 contents differ:
  local hash: 1rh7qxmylsbsaah59h7sclqqxcz0lwsixlc0krkzwhx8gfhlyam6
$ wget -q -O - 
http://hydra.gnu.org/nar/6ksnwcqn92z2nf6qw5js7njnfqlifgpb-guitarix-0.33.0 | 
bunzip2 | guix archive -x t
$ LC_ALL=C diff -r /gnu/store/6ksnwcqn92z2nf6qw5js7njnfqlifgpb-guitarix-0.33.0 t
$ LC_ALL=C diff -r --no-dereference 
/gnu/store/6ksnwcqn92z2nf6qw5js7njnfqlifgpb-guitarix-0.33.0 t
File /gnu/store/6ksnwcqn92z2nf6qw5js7njnfqlifgpb-guitarix-0.33.0/lib/libgxw.so 
is a symbolic link while file t/lib/libgxw.so is a regular file
--8<---------------cut here---------------end--------------->8---

It appears to create libgxw.so either as a symlink or as a regular file
in a non-deterministic fashion.

It would be nice to see why this happens, and whether this affects all
Waf-based packages.


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