Bug#1020661: libid3tag: reproducible-builds: Embedded build path in libid3tag.so.*

[Vagrant Cascadian]

Source: libid3tag
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/x86_64-linux-gnu/libid3tag.so.0.3.0:

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/libid3tag.html

  /build/1st/libid3tag-0.15.1b/ucs4.c:43
  vs.
  /build/2/libid3tag-0.15.1b/2nd/ucs4.c:43

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

With this patch applied libid3tag should build reproducibly on
tests.reproducible-builds.org!

Thanks for maintaining libid3tag!

live well,
  vagrant
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