Bug#1023956: fl-cow: reproducible-builds: build path embedded in libflcow.so

[Vagrant Cascadian]

Source: fl-cow
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/fl-cow/libflcow.so:

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

  /build/1st/fl-cow-0.6/fl-cow/fl-cow-config.h:1
  vs.
  /build/2/fl-cow-0.6/2nd/fl-cow/fl-cow-config.h:1

The attached patch to debian/rules fixes this by passing the default
buildflags, which include -ffile-prefix-map to avoid embedding the
absolute build path in the binaries.

Alternately or even preferably, updating to dh and a recent
debhelper-compat version might fix this as well as other issues.

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

Thanks for maintaining fl-cow!

live well,
  vagrant
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