Bug#1011471: mgdiff: reproducible-builds: embedded build paths in /usr/bin/mgdiff

[Vagrant Cascadian]

Source: mgdiff
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/bin/mgdiff:

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

  /build/1st/mgdiff-1.0/mgdiff.c:1057
  vs.
  /build/2/mgdiff-1.0/2nd/mgdiff.c:1057

The attached patch fixes this by explicitly passing CFLAGS to
make in debian/rules, which includes the -ffile-prefix-map
argument to avoid embedding the absolute path in compiled files.


With this patch applied, mgdiff should build reproducibly on
tests.reproducible-builds.org!


live well,
  vagrant
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