Bug#1005794: snibbetracker: reproducible-builds: Build path embedded in debug symbols

[Vagrant Cascadian]

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

Different build paths trigger reproducibility issues with binaries such
as /usr/bin/snibbetracker and relevent debugging symbols.

For two builds done with reprotest, the debug symbols contain the
different build paths:

  0  (line_strp)     (offset: 0x0): /tmp/reprotest.lNSnkN/const_build_path/snibbetracker/src
vs.
  0  (line_strp)     (offset: 0x0): /tmp/reprotest.lNSnkN/build-experiment-1/snibbetracker/src


The attached patch fixes this by passing -ffile-prefix-map in
debian/Makefile to avoid embedding the build path into the binaries.


Another option might be to pass COMPILER_FLAGS=$(CFLAGS) to use the
default flags from debhelper/dpkg-buildflags, which includes
-ffile-prefix-map, and/or explore patching the upstream
Makefile to accept variables passed to it...


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


Thanks for maintaining snibbetracker!


live well,
  vagrant
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