Bug#1020806: perl-byacc: reproducible-builds: differing buildid in in /usr/bin/pbyacc

[Vagrant Cascadian]

Source: perl-byacc
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 buildid differs in /usr/bin/pbyacc when built with a different build
path:

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

The attached patch fixes this in the upstream Makefile by adding
-ffile-prefix-map to CFLAGS.

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

Thanks for maintaining perl-byacc!

live well,
  vagrant
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