Bug#1039618: liblopsub: reproducible-builds: embedded build path in lopsubgen

[Vagrant Cascadian]

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

The build path is embedded in /usr/bin/lopsubgen:

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

  /build/1st/liblopsub-1.0.3/lopsubgen.c:49
  vs.
  /build/2/liblopsub-1.0.3/2nd/lopsubgen.c:49

The attached patch fixes this by passing the -ffile-prefix-map argument
to the compiler in the upstream Makefile.

According to my local tests, with this patch and the recently submitted
timestamp patches applied, liblopsub should build reproducibly on
tests.reproducible-builds.org!

Thanks for maintaining liblopsub!

live well,
  vagrant
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