Bug#1021471: python-djvulibre: reproducible-builds: build path embedded in decode.cpython-310-x86_64-linux-gnu.so

[Vagrant Cascadian]

Source: python-djvulibre
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: buildpath
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The build path is embedded in
/usr/lib/python3/dist-packages/djvu/decode.cpython-310-x86_64-linux-gnu.so:

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/python-djvulibre.html

  /build/1st/python-djvulibre-0.8.8/build/temp.linux-x86_64-3.10/src/decode.c:70219
  vs.
  /build/2/python-djvulibre-0.8.8/2nd/build/temp.linux-x86_64-3.10/src/decode.c:70219

The attached patch to setup.py fixes this by allowing the default CFLAGS to be
passed from debian/rules, which includes -ffile-prefix-map to avoid
embedding the build paths in the binaries.

According to my local tests, with this patch applied, python-djvulibre should build
reproducibly on tests.reproducible-builds.org!

Thanks for maintaining python-djvulibre!

live well,
  vagrant
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