Bug#1020872: xvier: reproducible-builds: buildid differences in /usr/games/xvier*

[Vagrant Cascadian]

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

When the build path differs it results in a different buildid in
/usr/games/xvier*:

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

The attached patch to debian/rules fixes this by adding
-ffile-prefix-map to CFLAGS.

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

Thanks for maintaining xvier!

live well,
  vagrant
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