Bug#995092: guile-3.0: reproducible builds: parallelism triggers differences

[Vagrant Cascadian]

Source: guile-3.0
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: randomness toolchain
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The order of references to various .scm files used when building guile
(or using guile to build various .go files) may appear in arbitrary
order, or sometimes even missing (in the example below):

  https://tests.reproducible-builds.org/debian/rb-pkg/bookworm/amd64/diffoscope-results/guile-3.0.html

  /usr/lib/x86_64-linux-gnu/guile/3.0/ccache/ice-9/deprecated.go

  26 ice-9/deprecated.scm vs. 26 ice-9/deprecated.scm
  27 ice-9/boot-9.scm         27 ice-9/boot-9.scm
 	                          28 ice-9/psyntax.scm


The attached patch fixes this by disabling parallelism in debian/rules.

With this patch applied, guile-3.0 should become reproducible on
tests.reproducible-builds.org once it migrates to bookworm (in the
unstable and experimental suites build paths will still trigger issues).

Though, the underlying issue is also triggered when using guile to build
other packages... so it would be good to fix in guile upstream as well,
as this is part of a toolchain used to build other packages...


Thanks for maintaining guile-3.0!


live well,
  vagrant
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